Understanding Native Resolution For Your Home Theater Projector

Understanding Native Resolution For Your Home Theater Projector
By Semore Bernstein

What is Native Resolution for your Home Theater Projector?

To understand what is native resolution, lets start with an understanding of the concept of 'resolution'. Resolution is concerned with the mapping of the information within a picture or image by the dot area.

The smaller the dots, and the more densely packed it is, the greater the resolution, since the mapping of dots as measured in pixels constitutes the data for reproducing the images in video outputs of home theater and other viewing systems. This data processing capability of the projector, as measured in pixels, is what constitutes native resolution.

For high definition home theater projector pictures with good resolution, both the native resolution of the projector should match the resolution of the video signal or video input, failing which, distortion of the images is likely. Native resolution of home theater projectors is measured in two dimension figures with current capabilities ranging from (640480, 800600, 1024768, 16001200) for 4:3 image aspect ratios and the occasional odd resolutions like 12801024.

Thus, if projectors of 1280X 1024 native resolution were to map a video signal of resolution 1024 X 768, there would errors and likely distortion in the image. To effectively combat or otherwise provide for different standards, most home theater video projectors come with capabilities of multiple resolution standards, though it is most likely to be multiples of the lower resolution values.

Advice on Home Theater Projectors
Advice on Home Theater Projector Displays
Advice on Home Theater Projector Mounts

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DVD Projector Rentals

DVD Projector Rentals
By Marcus Peterson

DVD is a type of optical storage technology. Digital form of storage has completely replaced magnetic storage media like floppy disks. DVD is the acronym of Digital Versatile Disk and is better than CD in terms of audio and video quality. It is versatile and can be played in DVD players and computers.

DVD comes in various formats like DVD-R and DVD-RW, the R and W means read and write capacity of the disc. DVD players can play units can play a various units audio and video discs in different formats such as CD-R, CD-RW, mp3 and VCD. DVD players also support jpeg formats. Some DVD players have recording features.

DVD projectors are used to project audio and video images from DVD players and VCR. Care should be taken to ensure that the medium used is compatible with the DVD projectors. For instance, some DVD projectors dont support inputs from computers. While hiring DVD projectors, the accessories are DVD players, DVDs, sound systems and screens. These have to be carefully chosen. They also come with IR remote controls and laser pointers. The output can be fed into high resolution plasma and LCD displays.

Some of the branded names available for rental come from 3M, Canon, BenQ and InFocus. They are available in different models with different features. DVD projectors can be hired for as low as $80 and the accessories are charged with their own rental rates. The rental companies require credit card information and an ID. Since DVD projection is of high quality, the major segment is the corporate and business houses for their presentation requirements.

DVD projectors, because of their versatility and high quality, are used in wedding receptions and other staging events such as conferences and trade shows. DVD projectors have made the film projectors less attractive.

Projector Rentals provides detailed information on Computer Projector Rentals: A Guide, DVD Projector Rentals, Film Projector Rentals, LCD Projector Rentals and more. Projector Rentals is affiliated with DLP Projectors.

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Looking For A Cheap LCD Projector TV?

Looking For A Cheap LCD Projector TV?
By Zach Parker

Knowing what brightness and contrast ratios are best for your lcd projecting needs is probably going a bit too far, but it will definitely help if you do. Used lcd projectors may be a wonderful investment; just because they have been viewed by someone else does not mean it is in poor condition. Lcd projectors are prone to the screen door effect which means certain images may appear as if being viewed through mesh or fine screen. Choosing the lcd projector that is versatile, reliable, and portable may be a tall order to fill if you don't know alot about projectors. In contrast to some of the other lamps in lcd projectors, halogen lamps burn at a steady rate and have a consistent brightness throughout the lamp life. Knowing what is necessary in your lcd projector and how often those features will be needed can help you decide which one is right for the job.

Lamp life for metal halide bulbs in lcd projectors normally range from 750 to 4,000 hours or more depending on how it is used. A review of the upcoming digital projectors is really exciting due to new technologies constantly being developed for the industry. Lcd projectors are versatile, reliable, and portable; this is why they have become really popular over time; they can be transported anywhere. These projectors deliver a better picture than the lcd television sets that are found in most modern homes. Used lcd projectors purchased on ebay normally have a picture on the bidding page; this might allow you to determine the condition before you make the purchase.

These lcd projectors have a variety of functions for high picture quality and network compatibility is also included. Just about all projectors use the same kinds of bulbs for illumination; most people are shocked to find out that the bulb used is not that expensive. When dealing with lcd projectors you might find that it will provide several incredible viewing opportunities for you and other guest viewers. When dealing a lcd projector for the first time; make sure you read the step by step instructions on how to operate the equipment.

A digital lcd projector of the present has an lcd approximately the size of a small color slide and works similar to traditional slide projectors. Lcd projector rentals require the user to know what size of the audience, viewing angle, viewing distance, room brightness, and location it will be used. Lcd projector rentals are a big business for those that only need to project for presentations or events on a sporadic basis for home or business.

Still looking for a cheap LCD projector TV ? Try visiting LCD-Projector-Sales.info, a website that specalizes in providing LCD projector rating advice, tips,resources and information on how to find a LCD projector online!

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Understanding Projector Screens: Be Careful You May End Up With TOO Bright An Image!

Understanding Projector Screens: Be Careful, You May End Up With TOO Bright An Image!
By Andrew Ghigo

Today's compact yet powerful front video projectors may leave you with a too bright an image to watch! This being especially so if you intend to watch a projected image in a darkened room which after all, is most often the case with a home theater setup.

Defining Screen Gain

Prior to proceeding with our discussion, it is important that one has a full understanding of what the term screen gain is all about.

It may sound strange that we talk about gain when in reality a projector screen is nothing more than a passive device. Yet there is - it is all a question of how the screen surface distributes the reflected light.

Screen gain is a measurement of the reflectivity of the screen surface. It measures the ability of the screen to direct incident light back to the audience.

The gain number represents the ratio between incident light and reflected light. A flat matte white surface has a gain of approximately 1. A gray screen has a gain less than 1 and therefore, it attenuates incident light. Reflective screen surfaces have gains greater than 1; these projection screens direct more incident light back to the audience.

Gain is always measured in front and perpendicular to the screen at the point of maximum brightness; this represents peak screen gain and occurs at the zero viewing angle perpendicular to the screen surface.

For a screen with gain greater than one, the gain drops as one moves to the side and view the screen at an angle to the perpendicular drawn from the center of the screen. The angle at which screen gain falls to half the peak is referred to as half gain viewing angle. A person viewing the screen from this angle will see the image half as bright as the person seated at the center. The more one moves further away from the center, the dimmer the projected image will be.

The higher the peak screen gain, the narrower the supported viewing angle. This is the price one has to pay for a higher screen gain - the higher projector screen gain at the center is in fact achieved by directing more light towards the center viewing positions rather than allowing for a uniform reflected light over a wider angle of view.

Projected Image Brightness:

Matching the projection screen gain with the ambient light and the video projector output is essential if you want to ensure that you will end up with a correct level of projected image brightness.

This is an extremely important issue. Do not forget that a basic requirement for a great movie experience is a comfortable environment. This means that the time one spends watching a movie should be as comfortable as possible. Exposure to a bright projected image is uncomfortable on the eyes - even when this is for just a few minutes, least imagine when watching a two-hour movie.

A Tricky Matching Process!

Ambient Light Conditions, Image Brightness & Screen Gain

A projected image is at its best when viewed in total darkness - this helps take away any visual distractions - rendering it easier for the viewer to get deeper immersed into the movie action.

In the home, achieving a completely darkened room is almost impossible except in the case of the dedicated home theater setup. The amount of ambient light present has an impact on the resultant projected image contrast. This calls for the need to increase the image brightness to maintain the correct level of image contrast.

The tricky issue is to arrive at the correct level of image brightness for a pre-set level of ambient light. This in view that projected image brightness is a function not only of the projector output, but also of the screen gain, and image size.

The explanation that follows should help you get a better understanding of the relationship that exists between these three inter-related parameters.

Display Brightness and Screen Gain

The brightness output level of your projector is a measure of the projector output power in terms of light intensity. Please keep in mind however that the resultant projected image brightness is a different issue. Image brightness falls in proportion to the area of the projected image size - the bigger the projected image is, the dimmer it will look for a fixed level of projector brightness.

The projected image brightness - more specifically the Luminance level for a projected image, is a measure of the light reflected from the projector screen area. It is measured in foot-Lamberts, and is defined as:

ANSI-lumens of your projector divided by the square footage of Screen.

(Note that one foot-Lambert is equal to 1 ANSI lumen per square foot.)

To arrive at the actual level of light reflected from the screen surface, the above result must be multiplied by the projector screen gain.

A useful reference here is what has been defined as 'sufficient brightness' by the Society of Motion Pictures and Television Engineers, also known as SMPTE.

In standard 196M, the SMPTE determined sufficient brightness for showing motion pictures in a darkened room using a unity gain matte white projector screen, as 12 - 22 foot-Lamberts. In practice, the luminance target level is set to about 16 foot-Lamberts, while the average bright scene brightness level in a movie theater is typically 60% to 75% of this target value.

Display brightness is in itself an entirely subjective term; whats more, it is all relative to the amount of ambient light falling on the screen surface.

The following rules of thumb would surely come to assistance in this respect:

The contrast ratio between the projected image and the ambient light level falling on the screen should be at least 5:1. This is necessary for the eye to perceive a real impression of brightness. If this contrast ratio is not achieved, the projected image will not be considered of adequate brightness level.

When viewing takes place under normal ambient light conditions, the luminance level should be close to 50 foot-Lamberts. This level of luminance is derived from the fact that SMPTE indicated a target level of image brightness for a CRT TV as 50 foot-Lamberts, this in view that a TV is normally viewed under normal ambient light. One may argue that TV is a totally different technology this is true, but this target level for image brightness or luminance, still holds good for most circumstances.

How does all this translate in practical terms?

If one is viewing an image in typical very low ambient light conditions (say less than 2 foot-candles - equivalent to approximately 22 Lux), then the minimum required light level illuminating the screen surface should be around 10 foot-candles to achieve sufficient image contrast.

For a matte white projector screen surface with a screen gain of one, this translates to a minimum of 10 foot-Lamberts in terms of light reflected from the screen for image brightness. This is close to the SMPTE typical requirement for average luminance when viewing pictures in a darkened room.

Similarly, if viewing were to take place under normal ambient light room conditions (typically 10 foot-candles or 110 Lux), applying our first rule of thumb to achieve the required contrast level would result in a luminance level of 50 foot-Lamberts (approx. 540 Lux) for the same matte white projector screen surface. This is also in line with the target luminance level detailed in rule 2 for viewing under normal ambient light conditions.

Note:

• Light illuminating a surface is measured in lux (Lx = lumens/m2), or foot-candles.
• Light reflected from an area (luminance) is measured in candelas/m2 (cd/m2) or foot-lamberts (fL).

Now, lets consider as an example what will happen with different projector screen gains for say a given 1000 ANSI-Lumens projector and a 100 diagonal screen size.

Projector Screen Gain 1 1.5 2Image Luminance in foot-Lamberts304560

It is clear that our 1000 ANSI-Lumens projector would produce a too bright an image when the latter is viewed in a darkened room, even when using a standard matte white projector screen with unity gain. Similarly, use of this projector in conjunction with a projector screen surface having a gain of 2 may result in a too bright an image even when viewing takes place under normal ambient light conditions.

Andrew Ghigo A Telecoms/Electronics engineer by profession, with specialization in digital switching and telecoms fraud management systems.

Editor and publisher of http://www.practical-home-theater-guide.com - a site dedicated to all home theater enthusiasts with the scope of serving as a comprehensive home theater guide to home theater systems, product reviews and home theater design.

This article is an excerpt from a series of guides appearing under thehome theater screens section of the site.

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Benefits of a HighQuality LCD Projector Lamp for Your LCD

Benefits of a High-Quality LCD Projector Lamp for Your LCD
By Enreek Kahlon

In terms of multimedia presentations, LCD projectors have proven to provide impressive image quality and high resolutions. However, if your projector suddenly fails to work and you need to present a proposal with potential clients, it could cause your business to lose money, or worse, it could cause your job.

The most common problem of projectors is the sudden burn out of LCD projector lamps. Fortunately, these LCD projector lamps can be easily replaced. Although anyone can replace the lamps for your LCD projector, choosing the lamp can be an overwhelming task. You need to ensure that the type of lamp you buy is compatible with your projector.

A high-quality LCD projector lamp should be able to operate for over 4,000 hours. However, the measurements of lamp life are not reliable because the lamp can still work, even if it becomes dimmer. For this reason, you need to check the peak lamp life listed in most manufacturers of LCD projector lamps, which provides users with information of the total brightness a particular lamp could provide.

Choosing a high-quality lamp for your LCD projector should be your first concern, instead of price. Compared to the affordable halogen lamps that last about 70 hours, metal halide lamps can work up to 500 hours. Meaning, the more expensive LCD projector lamp you choose, the longer-lasting life it would provide.

How to Choose an LCD Projector Lamp

There are only two types of lamps used in LCD projectors metal halide and tungsten halogen. In order to choose a quality lamp, you have to understand how each one works.

A metal-halide lamp provides better brightness, but lower consumption of power. Be aware that lamp wattages do not reflect the brightness. Metal-halide LCD projector lamps are more efficient because it could provide your projector with a very white light until the end of its life.

On the other hand, tungsten-halogen lamps produce whiter lights because it runs at a higher temperature than other lamps. Although the white light will become yellow during its lifetime, it provides a longer lamp life because of its low-pressure and high temperature features.

Although metal-halide LCD projector lamps are more expensive, they could provide over 2,000 hours compared to the tungsten-halogen lamps 70 hours of operation. Be aware that lamps of your projectors could last longer when you operate them in economy mode, which automatically cools down when the projector becomes idle.

How to get the best LCD Displays, TVS, computer monitors and more. This is must read before you decide to buy... LCDs and LCD Displays, at http://www.dreamtekk.com

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LCD Projectors for Sale

LCD Projectors for Sale
By Ken Marlborough

Do you want to continue to be at the cutting edge of technology with high-end presentation products? Do you want to keep your audience glued to you and the vibrant graphics and clear characters of your presentation? Whether you are presenting to 10 or 10,000 people, there is bound to be an LCD projector that is perfect for you. Here is a simple guide on what to look for when you want to purchase one.

Resolution

The first consideration to look for when shopping for an LCD projector is resolution. Resolution is the number of light dots (called pixels) per square inch of the image produced. The higher the number of the pixels, the clearer and tighter your image will be. Also, if your LCD projector of choice is high in resolution, the image you can broadcast can be expanded to greater degrees. If your lecture or presentation is heavy on graphics and high quality color, or if you need to present to a large crowd, then you will need an LCD projector with high resolution.

Brightness

Since the image your LCD projector will broadcast is projected with a high-powered light bulb, you will also want to consider how bright a projection you will need. Again, the brighter the image you project, the farther away it can be seen. This is an important consideration for people thinking of presenting to large and small groups.

Price and other considerations

These projectors do not come cheap, so price is a major consideration. If your company is small, a desktop projector with resolution the size of your typical computer monitor should suffice. Also, be sure to check on compatibility issues. Is the projector you want compatible with your hardware? If it is not, you may wind up with a very expensive lamp. Finally, ask about user support. Does it come with a warranty? If it does, how long is the coverage? Is there a technical support hotline you can call if you have trouble with your projector? All these things will factor into getting an LCD projector that suits your needs.

LCD Projectors provides detailed information on LCD Projectors, LCD Projector Rentals, LCD Projector Lamps, LCD Video Projectors and more. LCD Projectors is affiliated with Cheap LCD TVs.

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Used LCD Projectors

Used LCD Projectors
By Ken Marlborough

Apart from the usual used LCD projectors, those which have been used from some considerable amount of time by someone and are now for sale, there are some other categories of used LCD Projectors.

One of these categories is called demo projectors - projectors that have been used sparingly in-house for customer demonstrations. The majority of demo projectors generally have 90% or more of the original lamp life remaining at the time of resale. Demo models that are still in production ship with a full manufacturer's warranty. The length of warranty varies on demo models that are no longer in production.

Another category is refurbished projectors - projectors are most often the source of best projector deals. These projectors have been returned to an authorized factory service center and restored to meet manufacturer's original quality standards. Refurbished projectors feature new lamps, yet the warranty varies by manufacturer.

Yet another category is bargain buys - projectors that are new, factory-sealed units and are priced less than US $1500. These projectors are typically SVGA resolution, are portable, and feature an adequate amount of brightness for most any environment. Because of their budget price, the length of warranty on these projectors varies.

There are several Web sites that sell used LCD Projectors over the Internet. However, when buying over the Internet, one should not only look at the security of the mode of payment, but also about the vendor who is selling the product on the Web site. Generally, some people who have bought a product from a vendor leave a comment about the quality of service and product sold by the vendor; these comments are often very helpful in eliminating the vendors with a poor track record.

Finding a used LCD Projector is not difficult, what is though, is narrowing down to decide on a projector that meets the requirements, comes from a vendor who can be relied upon, and is at available at the best price among all the Web sites on the Internet that sell used LCD projectors.

LCD Projectors provides detailed information on LCD Projectors, LCD Projector Rentals, LCD Projector Lamps, LCD Video Projectors and more. LCD Projectors is affiliated with Cheap LCD TVs.

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Home Theater Video Projectors

Home Theater Video Projectors
By Jason Gluckman

A home theater enables us to view films in the comfortable ambience of our homes. The unique ambience of movie halls can be recreated completely, minus the crowds, and favorite movies can be watched with friends and relatives in comfort. Home theater video projectors are the main component around which the home theater system runs.

At present, there are three kinds of video projector technology in use. They are CRT, LCD, and DLP. Apart from these, there are certain modifications also available based on the technology used for the above three.

During the early years of video projectors, television expertise was centered on Cathode Ray Tube technology, or CRT. Cathode ray tubes are used for the generation of a television image. Three small CRTs with a single unit meant for every principal color, and a light-magnifying lens, helps in the projection of a color representation against a big screen in a dimly lit room. A CRT projector is capable of creating superior high-resolution images. This can be achieved with the help of the right combination of video processing circuitry, CRT size, and lens combination.

The second sort of video projector is the LCD projector, or Liquid Crystal Display. This is different from a CRT projector in the sense that it is not based on the conventional projection tube. An LCD projector primarily operates by delivering a strong light source through a transparent LCD chip comprising of individual pixels, which exhibits the moving video image. This image is subsequently projected through a lens to a big screen.

The rapid developing sort of video projector with respect to sales is the DLP, or Digital Light Processing projector. This type of projector is very similar to the LCD as in this also the real image is exhibited on a chip.

Home Theater Projectors provides detailed information on Home Theater Video Projectors, Home Theater LCD Projectors, Home Theater Projector Packages, Home Theater Front Projectors and more. Home Theater Projectors is affiliated with Curtains For Home Theater Screens.

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Computer Projector Rentals

Computer Projector Rentals
By Eric Morris

Computer projectors have become indispensable for company presentations. The audio-visual impact alone really drives a difficult point home.

Most computer renting companies also provide computer projectors. However renting a computer projector can be complex as projectors are custom-designed for different operating systems and even processors. Before renting, a company will ask what computer will be used: iMac computers use different types of projectors than IBM. The resolution and the video card of the computer also matter in the final output on the projector.

Another factor is the room size and lighting. Rooms that cannot be darkened would preferably need a LCD screen. LCD screen would also Plasma monitors would suffice if the assembly will be small. The size of the monitor would also depend on the size of the room and how far the people are going to sit from the display. Sound quality is also affected by the size of the room.

Before renting a projector, inform the renting company whether videos are to be shown or just slides and transparencies.

Computer projector renting companies usually setup the entire audio-visual equipment when a rental order is placed. Get the whole thing checked, for video and sound quality. Also try out the projector before hand, especially if there are laptops to be used. The renting company also undertakes the dismantling of the unit after the program is completed.

Renting companies allow their projectors to travel with the business if necessary. For portable projectors, insist on a case to pack the equipment. Also the projector itself should be lightweight, not weighing more than 10 pounds.

Costs of renting computer projectors are tax deductible if they are used for business. Companies may pay for them using checks or their company credit card.

Computer Rentals provides detailed information about computer rentals, laptop computer rentals, computer projector rentals, desktop computer rentals and more. Computer Rentals is the sister site of Nature Screensavers.

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Auditorium LCD Projectors

Auditorium LCD Projectors
By Ken Marlborough

Auditorium LCD Projectors are generally up to 40kg in weight, with 3,000 lumens (a measure of brightness) and above, have SVGA (brightness range from 1700 - 2000 lumens) or XGA (brightness range from 2000 - 3000 lumens, are more expensive than SVGA) native resolution. Auditorium projectors are mostly LCD projectors and usually come with a ceiling or rear mount facility. They usually have motorized zoom lens, are generally operated via remote control and offer multiple input and output ports for both PC and video. Auditorium LCD Projectors generally require external speakers and are targeted at spacious venues like theaters, auditoriums and convention halls.

In other words, auditorium LCD projectors are heavy duty, and super bright, allowing them to provide the added illumination for very large applications. These projectors deliver high brightness that can be used in a wide range of places. They generally come with a lens shift function and a wide range of optional, interchangeable lenses also contributes to installation ease. These LCD Projectors have a variety of functions for high picture quality and network compatibility is also included. Providing realistic colors, sharp contrast, and super bright images, they enable presentations with persuasive impact in a variety of situations.

Some factors which help in choosing a better Auditorium LCD Projector are: Lumens, Resolution, Lens Power, Keystone Correction, Scanning Frequency, Contrast, Lens Throw Ratio, Aspect Ratio, Image Offset Range, Computer Compatibility, Video Compatibility, Image and Mouse control, Projection Modes, Color Reproduction and Lamp Life.

These projectors generally have a specially designed auto focus lens, which allows for quick and easy switching between multiple screens with minimal user adjustments. Their automatic color correction feature provides true color reproduction even when projecting onto colored or textured walls for a perfect presentation anywhere. Some of them have a 3-D Reform technology, which lets one set up the projector virtually anywhere in the room and still get an aligned image.

While choosing the right LCD projector for an auditorium, the dimensions of the auditorium, the ambient light conditions and the distance where the projector will be placed from the screen should considered and projectors whose specifications exceed the requirements should be considered.

LCD Projectors provides detailed information on LCD Projectors, LCD Projector Rentals, LCD Projector Lamps, LCD Video Projectors and more. LCD Projectors is affiliated with Cheap LCD TVs.

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An Introduction To LCD Projectors

An Introduction To LCD Projectors
By Elizabeth Morgan

A projector is an apparatus for presenting an enlarged image on a screen from a transparency such as a photographic slide or a film. In a motion picture projector, each frame is held stationary at an illuminated aperture for a brief period, and then advanced by an intermittent sprocket or reciprocating claw, the light being cut off by a rotating shutter during the movement. The sound track on the film is reproduced at a separate sound head where the film is moved continuously at a constant speed.

LCD projectors come with the capacity to deliver high-definition pictures with high pixel density. Most of the LCD projectors are compact and lightweight; most of the advanced LCD projectors even use two-inch poly silicon panels. These panels (an advanced LCD projector might have TFT panels) help to produce high-quality images with a high-definition quality of about 1,000 scanning lines.

Most of the ordinary and average LCD screens have a screen ratio of 4:3. However, in some cases, an LCD might also have a screen ratio of 16:9. Images are projected on to a super-large screen. Some of the salient features of a compact, lightweight LCD projector are:

1. The utilization of three high-definition two-inch poly silicon TFT LCD

panels are key elements in the production of the three RGB basic colors.

2. Images of high ratio contrast are produced. Usually the image contrast is 400:1.

3. A good LCD projector adds to the normal brightness by about 40% over most other conventional and ordinary LCD video projectors. These LCD projectors use a high-transparency LCD panel for the above purpose.

For example, one of the recent high-quality LCD projectors is the Fujitsu LPF-D711 high-definition LCD projector for home theater.

Projectors provides detailed information on Projectors, LCD Projectors, DLP Projectors, Video Projectors and more. Projectors is affiliated with DVD Projector Rentals.

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Using a Digital Projector

Using a Digital Projector
By Luke Kent

Many schools have one or several digital projectors available for educators to use. Many people are worried that making slideshows and setting up the equipment will take too much effort andtime. On the contrary, the use of digital projectors saves timeand can take minimal effort.

Most digital projectors take no time to set-up. Have someone show you how to set-up the projector a few times and then try ityourself several times until you are comfortable setting up the projector on your own. Each projector and computer have theirown little quirks so having someone who is familiar with the system will prevent running into trouble in the future.

Creating slide shows for your lessons may take a little effort inthe beginning, however, once these lessons are created they will be saved for you to reuse or to tweak. There are also websites like http://MrKent.Net that provide subject specific slide shows for you to change or use as you please.

The only way to find out if using a digital projector is for youis to give it a try. Create or download a short lesson and present it to your students to compare it to your regular lessonFormat. One thing you will notice right away is that you spend more time interacting with your class and less time writing and erasing items on the board.

Mr. L. Kent is an experienced educator and president of MrKent.Net - Education Technology Made Simple.

For more educational techology tips and reviews please visit us at http://www.mrkent.net/ - Education Techology Made Simple.

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Choose the Correct Home Theater Projector

Choose the Correct Home Theater Projector
By Steve Faber

How to Pick the Correct Projector for Your Home Theater

You're finally making the jump to the holy grail of home theater video displays; the front projection system. There's nothing else that delivers that really big, impressive video image like a front projection system. It's how you get that real cinema experience in your home theater. Home theater projector prices have plummeted in recent years, and the size of the units have shrunk right along with the prices. No more do have to live with a coffin sized box on your ceiling. As sizes have decreased, the image quality and brightness have actually improved dramatically. You'll notice image quality and brightness are two separate issues.

How do choose the correct home theater projector for your application from the myriad of projectors on the market today? There are so many different units, each with their strengths and weaknesses. First of all, there are two main projection technology categories, analog and digital. Analog projectors are based on CRTs, a mature technology that's been around for decades. Those are the projectors with the separate red, green and blue picture tubes and three lenses on the front. The other projectors use one of the newer digital technologies. These projectors have a single lens on the front. There are three major types of digital projectors on the market today; LCD (Liquid Crystal Display), DLP (Digital Light Processing) and LCOS (Liquid Crystal On Silicon). Each type of digital projector has it's advantages too.

You need to evaluate your specific requirements in order to make the proper decision. First of all, look at the room. Is it a dedicated home theater or a multi use room? Do you have complete control of the light? What aesthetic concerns are you dealing with? What is your projector budget? How large of an image do you want? Do you watch primarily DVD movies, TV movies, sports, or other TV programming? What specific source components will you be using with your projector now or in the future? Is picture quality the most important thing, or are other concerns, such as noise, size or brightness more important? Are you installing the projector yourself, or are you hiring a custom installer to do the installation for you? Where must the projector be placed? Can you get the required video and control cables to that location? These questions must be answered to ensure you get the proper projector for your home theater. If you are using a custom installer, they will take into account these factors and specify the appropriate unit for you.

Dramatic improvements in the picture quality of digital projectors notwithstanding, CRT projectors still deliver the most film like image. They have no pixel structure and deliver rich, deep blacks. Properly set up and calibrated, with a good video processor, and with the proper size screen, a CRT projector will deliver simply stunning picture quality. You'll need to use a good quality projection screen, typically with 1.3 2.5 gain depending upon the size, viewing angel and ambient light in the room. Prices on really great CRT projectors have fallen like a rock in the last year or two. You can get a 9 CRT projector that used to cost $35,000 to $50,000, for less than a third of that figure now. Many firms no longer make CRT projectors due to the decreased demand for projectors using this technology. In addition, the required video processors have decreased dramatically as well. Ten years ago a great video processor used to cost $10,000 to $20,000. Now you can get one for well under $5,000 and as little as $2,000, brand new. They also easily last 8,000 10,000 hours when properly set up.

If they are so fantastic, why doesn't everybody still use CRT projectors? Well, there are many detriments to a CRT projector as well. The best ones, with the 9 tubes, are simply huge. It's like hanging an upside down bathtub on your ceiling. If you want to put one under a coffee table, it'll be one large table. They are also very heavy, around 150 200lbs, so you need the proper structure to support them. CRT projectors also require precise placement. They must be perfectly square with the screen, at the correct elevation for good picture quality. In addition, while many digital projectors have zoom lenses, allowing the projector to be placed at a range of distance from the screen, CRT projectors must be at a very precise distance for a specific screen size. These factors severely limit placement options. While the larger CRT projectors put out more light than their smaller counterparts, they have pretty dim images compared to even the least expensive digital projectors. Finally, CRT projectors require specialized setup in order to get a watchable, much less an optimum image. Every 6 months to a year, they must be re-calibrated to ensure you are still getting optimum picture quality.

There are some very good reasons why most people are using digital projectors in their home theaters today. Many are small and light, require minimal setup and calibration (compared to a CRT), are quiet and have a bright, sharp image. But, there are many different digital projectors, ranging in price from around $700.00 to over $100,000.00. Which one is the best for your specific application? Thankfully, the situation is changing, but many of the digital projectors marketed for home theater use are really just re-badged presentation units. Presentation projectors sacrifice good video quality for brightness. Brightness is much more important when giving a Powerpoint presentation in a lit room than the correct color palate or the black level. The red on the pie chart looks great, no matter what, as long as you can see it from the back row.

You want to choose one of the newer units that has been truly designed for home theater applications. The actual technology used for the imaging chip is not all that important, there are great examples using all three of the digital technologies. Companies such as Sony, Runco, InFocus, Vidikron, Marantz, Benq, Panasonic, Sharp, Optima and Sanyo and some others all make great home theater projectors. The projector will have great black levels, to accurately reproduce detail in the darker areas of the picture and give great contrast. Absolute brightness is not extremely important, unless you have a multi-use room without complete light control or you have a lot of people over for sporting events. If you are entertaining many people for sports, it's nice to have some light on in the room, so a brighter projector is advantageous.

Projectors come in a number of different resolutions. The lower the resolution, the smaller the screen you can use before you can see pixel structure. Also, the lower resolutions will not support true HDTV. Most will display HD, but at a decreased resolution. The lowest end projectors typically have resolutions of 800 x 600. The Texas Instruments Matterhorn chip is popular on budget priced wide screen projectors, and has a resolution of 1024 x 576. Anything over a resolution of 720 will allow for true HDTV. The TI series of HD-2 DLP chips has a resolution of 1280 x 720. In April of 2005, TI announced new DLP chips with 1920 x 1080 was ready for production, allowing for true 1080p resolutions. Projectors with this chip will begin shipping in Q1 of 2006. Blu-Ray Disc has stated they will support 1080p, so by late 2006 there will be commercially available 1080p content besides Microsoft's WMHD discs.

Another very important aspect of home theater projectors is the internal video processing. This is one of the primary differences between good home theater projectors and presentation projectors. Digital projectors must display progressive scan images at the native resolution of the chip, so any interlaced signal, such as 1080i HDTV, must be de-interlaced and then scaled to the native chip resolution. Poor quality video processors, weather in the projector or external units, cause all sorts of video artifacts that can get in the way of a satisfying video presentation. This subject alone is too in depth for this article, as entire texts have been written on the subject. However, one common video artifact is jaggies where diagonal lines are jagged instead of straight. Another annoying artifact caused by poor video processing is moire'. This is a pattern seen as alternating light and dark lines that change position as the image moves.

You'll want to be sure your projector supports the HDMI or DVI with HDCP copy protection to allow you to connect a HD-DVD, scaling DVD player or Blu-Ray Disc player. These devices will only allow maximum resolution on a display that has a digital video input with HDCP copy protection. In the future, cable TV and satellite providers may restrict the maximum resolution to their digital outputs too.

When choosing your new home theater projector, make sure it has the video quality, brightness, size, auditory and budget characteristics that you need. Projectors are a large investment, choose carefully and you will be rewarded with years of thrilling video in your home theater.

Steve has 15 yrs in custom electronics. He is a CEDIA certified designer with ISF and THX certificates. His experience includes: installer and programmer; system designer; business unit director for an a/v importer; sales rep for a CE distributor; and principal of a $1.5M+ CEDIA firm. He's now senior sales engineer for Digital Cinema Design in Redmond, WA. Get more great home theater and home automation information here:Home Theater Projectors

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How to Fix a Broken Slide Projector

How to Fix a Broken Slide Projector
By Jeffrey Saunders

A slide projector is a great way to store, share and show photos, presentations and other information. But what do you do when your slide projector is having problems. How to fix it can be a simple matter of jiggling a few wires, cords or cables, or taking the entire projector apart and taking a peek as to whats inside.

The most common problem with a slide projector that needs fixing is a simple projector jam. A projector jam is when one of the slides is stuck in a position that wont allow the carousel to rotate. Now, this may seem like a minor inconvenience, but it should also be the first area you look into when your projector is having problems. How to fix it, and remove the jammed slide can be done in a matter of steps.

1. Shut the slide projector off and let it cool down for a few minutes.

2. Remove the slide tray by loosening a latch or placing a coin in the middle of the tray & turning it

3. Turn the tray upside down

4. Locate the jammed slide and carefully remove it

5. Place the tray back into the projector

6. If the slide isnt damaged, insert it back into the carousel

The next time you notice your slide projector is having problems, how to fix it is to follow the steps listed above. Normally, when a slide projector wont fully rotate, its because of a jammed or lodged slide within the carousel. Carefully removing the trapped slide should solve any projector problems youre experiencing.

If youve followed the steps noted above, and you find that still your slide projector is having problems, an experienced technician may tell you how to fix it, and guide you through various stages of repair. The larger the slide projector you have, the more chances it has to jam. So before you take your projector apart or visit a potentially expensive repairman, be absolutely certain that it isnt a jammed slide thats causing your projector problems.

If your digital image projector is having problems, how to fix it can be a matter of replacing a burnt out bulb, ensuring that all your cables are properly connected to rebooting the entire system itself, depending on the sophistication level of your projector. Always go through the instruction manual when your digital projector is acting up.

Sometimes when your projector is having problems, how to fix it can be as easy as remounting it or reinstalling it. An improperly mounted projector can sometimes not project any image at all, and may appear to be broken and in need of fixing. Check to see if your projector is mounted and affixed straight. If it isnt, take it down and remount it, being careful to make certain that its properly mounted. That should solve any issues regarding your projectors refusal to show images. If that does not work, then you may consider taking your digital projector back to its point of purchase for a qualified inspection.

Jeffrey Saunders loves do-it-yourself technology

He also likes great deals on refurbished electronics. Amazing prices on big brand names like the Apple iPod Nano

And more fantastic deals on great items like digital camcorders.

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Computer Projector Rentals in Florida

Computer Projector Rentals in Florida
By Eric Morris

Computer projector rentals in Florida provide all kinds of computer projectors for short and long term rental in the state. Florida is one of the prominent hubs for all major activities, business centers and educational institutions. Today, there are many rental companies in the state, specializing in computer projector rentals.

Computer projector rental is the most apt and economical way to possess expensive computer projectors for limited time duration. Today, the computer projector has become an indispensable part of digital presentation in almost all schools, colleges and companies. The enhanced qualities of computer projectors have imparted tremendous changes in the method and quality of presentations. These qualities have led to the popularity of computer projectors among people in all sections of society.

RUSH Computer Rentals Inc., Fort Lauderdale Computer Rental Service, and Saint Lucie Co. Civic Center are some of the major companies in the field of computer projector rentals in Florida. Most of the rental companies in Florida handle both corporate and personal orders. There are also online computer projector rental companies that provide services to people in and around Florida.

Depending on the need, one can avail computer projectors for rental in Florida on daily, weekly, monthly and yearly rentals. All types of computer projectors, ranging from mobile computer projectors to meeting room computer projectors, can be availed for rent. Almost all top brands of computer projectors including Infocus, Proxima, Mitsubishi and Toshiba are available in the state for rental. The rental rates are determined by the model and the duration of the rent. It will fluctuate from company to company and from city to city.

However, getting computer projectors for rental is a complex task, as most projectors are designed for different operating systems and even processors. Thus, it is always advisable to determine the type of the computer projector you need before renting it.

Computer Rentals provides detailed information on computer rentals, laptop computer rentals, computer projector rentals, desktop computer rentals and more. Computer Rentals is affiliated with Laptop Computer Sales.

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An Introduction To LCD Projector Rentals

An Introduction To LCD Projector Rentals
By Marcus Peterson

LCD is a technology that is used to present a digital image for viewing, for instance, on a laptop or via a projector. LCD is the acronym for Liquid Crystal Display. Most projectors use LCD technology. They can easily incorporate text, graphics and video. These types of projectors are also known as PowerPoint projectors since they are mostly used for presenting PowerPoint slides by corporate houses and business houses for business and sales presentations.

LCD projectors are versatile, reliable and portable. They can be easily connected to video, PC and laptops; they are compatible to most systems. They can project images on any surface with equal brightness. They can present data, graphics and video. These projectors weigh less; they are easily transportable. They have long-life bulbs. They have built-in speakers.

LCD projectors are characterized by resolution, luminescence, dimension, weight and contrast. Resolution is defined as the number of horizontal picture dots times the number of vertical picture dots. Most projectors are usually XGA or SXGA i.e. 1024 X 768 pixels or 1280 X 1024 pixels. LCD projectors have a brightness or Lumens of 1000-5000 lumens. They vary in size from small to bigger sizes and they weigh two pounds to 100 pounds. The contrast ratio determines the handling of the subtler colors.

The major suppliers of LCD projectors are Toshiba, Sanyo, Hitachi, Canon and Plus. These manufacturers cater to all the segments with prices ranging from $1,000 to $15,000.

The rates of LCD projectors depend upon the type of projector and usually the daily rates vary from $100 to $300. The rates for multiple days are given with discounts.

LCD projectors are mostly used for conferences, staging events and business presentations. Their high resolution, ability to handle colors, and quick start up make them a powerful piece of multimedia equipment to convey the message across a large audience.

Projector Rentals provides detailed information on Computer Projector Rentals: A Guide, DVD Projector Rentals, Film Projector Rentals, LCD Projector Rentals and more. Projector Rentals is affiliated with DLP Projectors.

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Video Projector Guide

Video Projector Guide
By Riad Haddad

Well; the world of Projection is certainly a vast place to wonder uninformed, so get informed. I will try to keep this guide as simple as possible.

Things to look for when buying a projector:Manufacturer/MakeThere are many projector manufacturers these days that make it seem impossible to choose from. But to make it simpler, many manufacturers now a days use parts that are supplied from other manufacturer. In other word not all the parts in a projector is manufactured by the same manufacturer. Thus many projectors already have similar components incorporated into them. Always read reviews posted on computer magazines and online computer magazines before purchasing high end/high priced projector. Look for a company that offers the best warranty & support. Brands like Sony, Panasonic, Toshiba, Sharp, In-focus, View sonic, Mitsubishi, Epson are amongst the best there is.

TechnologyThere are many technologies available today. But the main two types are LCD & DLP. In simple DLP which stands for Digital Light Processing uses hair width tiny mirrors to reflect light into a screen. DLP offer better overall image but cost a lot more. So for home users its better to opt for LCD based projector because of there much lower price and higher availability. Also LCD projector offer excellent image that is comparable to DLP. Big companies and presentation oriented businesses well find DLP a better choice. There are also projections panels. Projections panels are a form of transparent display that are placed over an ordinary Overhead projector and used to project the same type of video sources that normal projector use. Projection panels are cheaper than the types described earlier.CRT Projectors are an old projection technology that is no longer used these days.

ResolutionResolution is very important aspect to consider when purchasing a projector. Many older models are VGA (640*480) & SVGA (800*600); these models are good for displaying movies and other low resolution images, but will no be sufficient for projecting high quality images demanded by high end application such as 3d modeling, games, simulators and CAD. Check the simple chart below:

640*480 (VGA) resolutions are good for Video Games, VHS, VCD and Standalone DVD users. This panel is perfect for DIYers wanting to keep costs at lowest.800*600 (SVGA) resolutions are perfect for Computer based DVD playback and normal Windows and operation system work. (Plus all the above)1024*768 (XGA) resolution is perfect for high resolution Computer Games and design applications such as AutoCAD (plus all the above)1280*1024 (SXGA) resolution is perfect for HDTV applications and computer software that require high detail (plus all the above)

Color DepthColor depth states how good the LCD represents color. Its the number of colors a monitor or an LCD panel is able to show. A good color depth is 16-Bit; although 24-Bit is strongly advised, this is the color depth that most high end projection panels have.

Lamps An important thing to investigate is the type of lamp used. Check the replacement price of lamps and life expectancy. It would make you no good if you purchase a low price projector and later find out that every lamp replacement will cost you 400$. New lamp models can work for a minimum of 10,000 hrs.

BrightnessBrightness output is expressed in lumens. The higher the lumens the better the image is displayed in less than perfect lighting conditions. Some new projector models can display a vivid image even with the light on. 2000 lumens is a good choice for home use. Choose 3000-4000 for presentation theaters and jobs that require a bright image in a not too darkened room. Lumens rating of below 2000 such as the low priced 1300 models will have to be operated in a completely darkened room (Pitch Black).

ConnectionsConnections are a very important factor when choosing a projector. Composite, S-Video and RGB is almost standard on most models. You will need RGB for hooking your computer or laptop; Composite & S-Video for connecting DVD players and VCRs. Some newer models have DVI inputs too that enable them to be connected to high quality video systems like a video editor or digital video cameras. A remote control is a must; you don't wan to get out of your comfy chair every five minutes. Some applications require two RGB connections for simultaneous viewing of different video sources, so make sure to check for it if you need it.

Long throw/Short throw projectionIts important to decide where you are going to place the projector. If the projector is going to be placed in front of an audience then you will need a short throw projector. And if you need to fix the projector some where behind the audience (Far from screen) you will need a long throw projector. What happens when you use short throw projector for a behind the audience application is that the image will be too large to fit on screen, and if you use a long throw projector for short distances you will get a very small and unclear image.

DIY ProjectorsWell this is interesting. Did you know that you can build a projector yourself, its not that hard really and it will cost you a fraction of retail prices? You should have basic knowledge with DIY projects. The image quality is very good you won't believe it. Though some patience is required in order to complete the projector.

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** You are free to publish this article by any delivery method you see fit. But you are kindly asked keep the article intact and as is.

Riad Haddad is a Software Developer and Internet Marketer specializing in state of the art custom solutions; from database development to website marketing.

www.fitsoftinc.com

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Film Projector Rentals

Film Projector Rentals
By Marcus Peterson

A film projector projects reels of film onto a screen to form a continuous image. Film projectors have the need to wind and unwind the reels and adjust the arms and distance. Despite the competition from video projection, film projectors have a niche market of buyers.

Film projector rental demand comes from residences, film festivals and university and school campuses.

Film projectors come with different widths such as 8mm, 16mm and 35mm. The type of projector depends on the space available and the number of audience. The demand for 35mm comes mostly from festivals while 8mm and 16mm find demand from other segments such as residences and student shows in universities.

Many of the rental companies are either owned by the universities or reside in the campuses. The demand for film projectors is cyclical as film festivals happen during a particular period of a year. Even for residences, the demand is usually in the summer months, when families like to have get-togethers outdoors.

The rental rates for projectors depend upon the type of films. 16mm projectors have a starting rental rate of $20 per day, 35mm at $50 per day. The total rental rates go up when we consider the screens and other accessories. Most of the a/v industry rental companies hold fewer stocks of film projectors. The rental companies in the university campuses charge lower fees for student groups.

Film projectors face severe competition from video projectors. New technologies such as DLP and audio/video storage media slowly make the conventional film based technologies obsolete. When compared with video projectors, film projectors lack features to control contrast and brightness. Even with cinema halls transitioning to digital forms of projection, film based projector manufacturers are dwindling and therefore are the rental industry of film based projectors.

Projector Rentals provides detailed information on Computer Projector Rentals: A Guide, DVD Projector Rentals, Film Projector Rentals, LCD Projector Rentals and more. Projector Rentals is affiliated with DLP Projectors.

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Computer Projector Rentals in New York

Computer Projector Rentals in New York
By Eric Morris

New York is renowned as the business capital of the world. People from in and around the country come to this place for various business activities. If you are planning a business meeting or conference in New York, computer projector rentals in New York will cater to all your presentation needs. Computer projectors are quite expensive, and availing it for rental will be a cost effective way to own it.

In recent years, the computer projector has become an integral part of presentations and seminars in schools, colleges and companies. Computer projectors have brought about a tremendous change in the conventional presentation. Enhanced technology and high quality presentation have led to the popularity of computer projectors among different sections of society. However, they are more in demand among students and businessmen.

With the popularity and increase in the demand for computer projectors, many companies have come forward in renting different types and models of computer projectors, especially in New York. RUSH Computer Rentals Inc. at Connecticut, G and G Technologies at New Jersey, Fort Lauderdale Computer Rental Service, and Saint Lucie Co. Civic Center at Florida are prominent computer projector rental companies. Today, almost all computer projector rental companies operate online.

Depending on the need, rental companies offer computer projectors for short and long term rental. Generally, these companies lend computer projectors for a day to 3 years. The rental rates will be based on the model and the duration of the rent. For example, a 3M 955 overhead projector is charged $65 for a day, while a higher end computer projector will be charged $200 a day. Thus, it is always important to determine the duration and the model you need before getting it for rental. Computer projector rentals are always a viable option, especially for a short period.

The rental rates fluctuate from one state to another. Still, the rental rates in New York are considerably lesser than other states in the country. Hence, computer projector rentals in New York are the best option to avail cutting edge technologies at very reasonable prices.

Computer Rentals provides detailed information on computer rentals, laptop computer rentals, computer projector rentals, desktop computer rentals and more. Computer Rentals is affiliated with Laptop Computer Sales.

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Video Projector Rentals

Video Projector Rentals
By Marcus Peterson

A video projector is a device that projects a video or computer image onto a screen. The commonly used inputs are video cassette players, CD and DVD players and PowerPoint presentations from computers. Some computers have CD as well as DVD drives which support these discs. Some projectors dont have VGA connectors, which take inputs from a computer.

A video projector employs one of three technologies: CRT, LCD and DLP. CRT projectors are just like television, i.e. they employ cathode ray tubes. The limitations of CRT video projectors are the heavy size and the requirement of absolute darkness for clarity of the picture. LCD projectors employ a special chip so that the advantage is that the projector is very compact. Besides, it has excellent contrast and brightness. The LCD projector employs individual pixels, which produces high resolution. The limitation of a LCD is it produces a screen door effect. Also the repair of one would result in a dark spot on the screen.

DLP technology employs a Digital Micromirror Device, instead of a chip. DLP projectors are highly suitable for viewing movies and also other multimedia presentations. The advantages of DLP projector include color accuracy and no screen door effect.

LCD and DLP video projectors are the favorites and therefore most of the inventory of the rental companies are the above mentioned ones. The rates of these projectors start at $100 and are dependent upon factors such as the resolution and weight. The rental companies provide support throughout the whole day and night. This includes online or phone booking, shipment, installation, and operation support.

Hotels, resorts, convention centers and conference halls enter into contract with rental companies to provide these services. The rental companies have chains of shops across a particular region or nationwide networks. The directories of these service providers can be obtained online, which directs them to the individual websites.

Projector Rentals provides detailed information on Computer Projector Rentals: A Guide, DVD Projector Rentals, Film Projector Rentals, LCD Projector Rentals and more. Projector Rentals is affiliated with DLP Projectors.

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LCD Projector Reviews

LCD Projector Reviews
By Ken Marlborough

Product reviews are more popular now as manufacturers seek new ways to entice customers to spend their hard-earned money on their products. Many companies use consumer product reviews as advertisements, and little wonder why they do. Manufacturers do not have to pay extra to advertising companies for expensive ad campaigns. However, the credibility of product reviews has been criticized. A review that simply reads I really loved your product! Keep it up! and leaves it at that is not what you should expect from a product review. With regard to buying something as expensive as an LCD projector, being informed about your prospective purchase is very important. Here is an article on how to look for an LCD projector based on product reviews.

Technical information

An informative product review should deal with information that is directly linked to the product being reviewed and it should be specific regarding its details and specifications. A typical informative product review on LCD projectors should contain the following information: resolution, brightness, price, and potential usage (sometimes called the for-whom section).

Resolution is how clear and tight the graphics being displayed are and they are usually determined by the number of dots per inch (dpi). A higher resolution means tighter graphics and less pixellation (the grainy quality in some images).

Brightness is exactly that--how bright the image being projected is. This determines from how far away the image can be seen. The brighter the image, the farther away it can be seen.

Reviews that include information on potential usage are particularly helpful. This section allows you to find out specifically if the product you want is applicable to your needs. Simply parallel yourself or your company with any one of the list of potential users, and you will be able to tell at a glance if the product is what you are looking for or not.

The reputation of the reviewer

Anybody can write a product review that is why you should be careful when taking advice from product reviews. If the review you are reading comes from a reputable Web site or magazine, then you should be in good hands. Be sure to do some research on the party doing the review before you take advice from them, or you may end up with a very expensive paperweight.

LCD Projectors provides detailed information on LCD Projectors, LCD Projector Rentals, LCD Projector Lamps, LCD Video Projectors and more. LCD Projectors is affiliated with Cheap LCD TVs.

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An Introduction To Home Theater Projector Screens

An Introduction To Home Theater Projector Screens
By Jennifer Bailey

Home theater projector screens are great for when you want a real movie house experience. When there is a projection of a video or an image, the presence of a projector screen is inevitable. A projector screen is a specially made flat screen to be hung on the wall or erected vertically where the image is reflected, so that the image size is enlarged. The surfaces of such screens are usually rough, and white in color.

There are quite a number of types of projector screens. They are home cinema projector screens, portable projector screens, manual projector screens, electric projector screens, fixed frame projector screens, and also movie board home cinema projection screens.

All these screens are used as home theater projector screens. These home theater screens are available in multiple, specialized projection materials tailor-made to add to the video quality. These home theater projector screens can easily be put in a training room, board room, or auditorium. All these screens are available in various dimensions starting from the standard 4:3 size to as large as 16:9 ratios. Most of the home theater projector screens are also available with black masking borders, in Video TV format, with stylish curved aluminum extruded cases, motor in-the-roller design for quiet operation, and other such facilities.

Some of the top home theater projectors are the Sanyo PLV-Z4, Panasonic PT-AE900U, BenQ PE8720, Epson Power Lite Cinema 550, NEC HT510, Optoma H31, In Focus Screen Play 4805, Sony VPL-VW100, Optoma Movie Time DV10, Runco Signature Cinema SC-1 and Sharp Vision XV-Z20000.

Projector Screens provides detailed information on Projector Screens, Video Projector Screens, Home Theater Projector Screens, Electric Projector Screens and more. Projector Screens is affiliated with Large Format Flatbed Scanners.

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Portable Digital Projector: Fifteen Selection Tips

Portable Digital Projector: Fifteen Selection Tips
By Jeff Van Der Wiel

There are a number of important things to look for in a portable digital projector for meetings on the go. Your specification shopping list should include factors such as:

Light Weight anything over 6 lb is not really portable;

Small Form Factor smaller dimension projectors are easier to pack and carry;

Set-up Speed look for a projector with some quick application select modes which match the type of presentation material and projection scenarios which are likely;

Screen Distance Flexibility flexibility to cope with varying distances from the screen short throw and zoom lenses provide flexibility;

Horizontal and Vertical Lens Shift or Keystone Correction to correct keystoning of the projected image when the projection screen is either not at the same height as the projector and/or horizontally in line / skewed - lens shift is preferred as there is no possibility of introducing artifacts from digital keystone correction;

Good Brightness look for over 1,800 ANSI lumens to cope with less than perfect projection situations with plenty of ambient light (eg. training rooms), 1,200 ANSI 1,800 ANSI lumens projectors can handle some ambient light;

High Contrast Ratio something of the order of 2,000 or over will produce excellent results

Low Noise Level - you dont want your voice to be competing with projector noise a noise level in the 20 28 dB (whisper quiet) should be achievable;

Rugged Design - to protect the projector from dust and tolerate knocks during transport - look for shutters, caps and lack of protruding controls;

Quick Shut Down (cooling cycle) - so that you can move on without delay if necessary

Simple Remote Control easy to use with large buttons - backlit if possible

Locking System makes your valuable, portable projector less attractive for misuse or theft - password login keypads are a common solution;

Personalized Start-up Image display your company logo for a professional touch

No PC Required Presentations - facility to load your presentation without a PC using a USB interface or similar;

Protective Carry Bag a bag which offers some protection while leaving room to store the power cord, cables etc.

An Engineer and Web Developer, Jeff van der Wiel is a avid science and technology follower and critic. Further information on digital projectors or another presentation alternative, interactive whiteboards is available at the respective links.

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Video Projector Screens

Video Projector Screens
By Jennifer Bailey

A projector is an apparatus for presenting an enlarged image on a screen from a transparency such as a photographic slide or a film. In a motion picture projector, each frame is held stationary at an illuminated aperture for a brief period, and then advanced by an intermittent sprocket or reciprocating claw, the light being cut off by a rotating shutter during the movement. One should have a clear idea about video projectors before buying video projector screens.

Video projectors have become common and captured the market throughout the world. They are especially common in schools and colleges where it becomes necessary to show videos and films (especially in film schools and institutes), or any place where people need to show films on a regular basis at a cheap rate to a large number of people.

There is a wide range of video projector screens available in the market. One can buy the kind of video projector screen one wants depending on the kind of surface. The surfaces vary from smooth to rough, and minutely undulated ones. However, before considering any video projector screens, one should consider the following elements: resolution, brightness or reflectivity, contrast, color accuracy, and build quality.

Some of the white (or gray) video projection screens can bring about a difference in resolution, or image detail. There should be a rating to indicate its inherent reflectivity, on which the brightness of the image depends. Contrast of the image is also dependent to great extent on the video projection screen. A screen should not reflect any color other than that of the projector itself.

Projector Screens provides detailed information on Projector Screens, Video Projector Screens, Home Theater Projector Screens, Electric Projector Screens and more. Projector Screens is affiliated with Large Format Flatbed Scanners.

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Projector Rental Question: What's a Lumen?

Projector Rental Question: What's a Lumen?
By John Beagle

Answer: The brightness of a projector is measured in Lumens
When Renting or buying an DLP or LCD Multimedia Projector you need to match the brightness of the projector to your audience and room size. Larger rooms and audiences require higher bulbstrength brightness.

Projector bulb strength brightness is measured in ANSI lumens or lumens. You also need to take into account the primary use of the projector, full motionvideo vs. static data.

Projectors range from around 650 to 5000 lumens in brightness.

Note: A standard 100 watt incandescent light bulb emits approximately 1700 lumens.

Presentations where the lights are on are the most desirable, but require higher lumen bulbs because you can interact and demonstrate off-screen with your audience.

Another consideration is portability of the projector. Lower lumen units are the most portable. As a general rule, as you increase bulb strength brightness, you reduce portability. High lumen projectors are larger and weigh more than low lumen projectors.

Less than 1000 lumens
-good for low ambient light, presentations.

1000 -2000 lumens -These
are the most popular units being sold and rented today.
Very practical and will work with some ambient light.

3000 lumens -Much
Larger unit than the 1000 to 2000 lumen units. Good for audiences of less than a hundred with ambient light.

5000 lumens
- For audiences of 100 or more under brighterlights

6000+ lumens - For largeevents like conventions, conferences, classroom training and trade shows wherethousands of people need to view a presentation at thesame time.

For more information: Projector Rentals at the Original Rentacomputer.com

Contact a Tech Travel Agent at http://www.Rentacomputer.com, email rentals@Rentacomputer.com or call toll free 800-736-8772.

John Beagle is a technology writer for Xponex Web and Media Services.

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Video Projectors

Video Projectors
By Elizabeth Morgan

Some of the various indispensable parts of a video projector are the feed spool, xenon arc lamp, projection lens, optical sound head, take up spool, an aperture, normal lens and a rotating shutter. But with the advancement of science, new technologies have come into play. The projectors have become much more advanced in terms of clarity of picture and the quality of the pixels. Also, the projectors have found use in everyday households, as new versions of domestic projectors have arrived on the market. The abundance of LCD projectors, DLP projectors and video projectors has allowed the common man to enjoy the experience of a big theater hall in his living room.

Video projectors have become very common throughout the world. One can have all the excitement and enjoyment of a big movie blockbuster at home. They are also used in schools and colleges where it is necessary to show videos and films on a regular basis to a large number of people.

It is always advisable to the users of video projectors or projection televisions to pay attention to the scaler. One can use a number of processors, scalers or switches to optimize the video sources to best match the native resolution of your video projector, flat panel, or LCD/DLP-based rear projection television. Video projectors have some kind of capability for scaling. Making use of or implementing an outboard processor or a scaler can raise the performance level to a much higher level for both video display and source components.

Projectors provides detailed information on Projectors, LCD Projectors, DLP Projectors, Video Projectors and more. Projectors is affiliated with DVD Projector Rentals.

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An Introduction To Projectors

An Introduction To Projectors
By Elizabeth Morgan

A projector is an apparatus for presenting an enlarged image on a screen from a transparency such as a photographic slide or a film. In a motion picture projector, each frame is held stationary at an illuminated aperture for a brief period, and then advanced by an intermittent sprocket or reciprocating claw, the light being cut off by a rotating shutter during the movement. The soundtrack on the film is reproduced at a separate sound head where the film is moved continuously at a constant speed.

An average projector usually has a picture resolution of 800 x 600 pixels. Most of the projectors weigh four to six pounds and come with a carrying case. All of the projectors have varied brightness and contrast levels usually the brightness varies from 1300 lumens to 1500 lumens. A projector with a brightness of 1400 lumens proves to be a good choice for small to medium-sized, well-lit rooms.

Some of the indispensable parts of a projector are the feed spool, xenon arc lamp, projection lens, optical sound head, take up spool, an aperture, normal lens and rotating shutter. But with the advancement of science, new technologies have come into play. The projectors have become much more advanced in terms of clarity of picture and quality of the pixels. Also, the projectors have found use in everyday households, as new versions of domestic projectors have arrived on the market. The abundance of LCD projectors, DLP projectors and video projectors has enabled the common man to enjoy the experience of a big theater hall in his living room.

Projectors provides detailed information on Projectors, LCD Projectors, DLP Projectors, Video Projectors and more. Projectors is affiliated with DVD Projector Rentals.

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A Short Guide to Video Projectors: Business vs Home Theater Projectors

A Short Guide to Video Projectors: Business vs Home Theater Projectors
By Andrew Ghigo

Today's multimedia video projectors represent a versatile, practical, and affordable tool that can serve different purposes both in the business as well as in the home entertainment arena.

The fall in price and the developments in video projection technology we have experienced during these last few years, have made the digital projector even more accessible to a larger group of home users.

Demand has increased to such an extent that manufactures are not only producing what are referred to as 'cross-over' models - i.e. projectors that can handle both PowerPoint presentations in the office as well as DVD movies at home, but they have also started to target the home entertainment domain by producing models specifically designed for home theater use. ...why?

It is true that 'cross-over' projectors can handle both worlds, but this does not mean that a video projector that can deliver a great presentation in the boardroom is also capable of delivering a great cinematic experience in the home theater.

Home theater projectors and business projectors have to fulfill distinct requirements in their use which can only be met if the video projector is specifically designed for the purpose.

What characteristics differentiate Business Video Projectors from Home Theater Projectors?

It is no surprise that video projectors are becoming a popular choice with many home theater enthusiasts. The digital projector can deliver the largest image for your dollar. Simply hook up your DVD and there you have the most cinema-like image in the home theater. Or connect a HDTV source such as a cable set-top box or satellite receiver, and there you have a huge 100 HDTV for the cost of a 50 plasma TV.

And in the boardroom, today's powerful digital multimedia projectors are proving to be more than ideal for business presentations; they are capable of delivering bright huge images under normal ambient room lighting - something only dreamt of in the days of the overhead projector. Simply plug in your laptop, and there you have the most fantastic business presentation in the world!

However, it is important to keep in mind that the boardroom and the home theater are two different arenas that require different beasts. The distinct requirements between the two are important; the discussion that follows explains what video projector attributes should apply in these two cases.

Important Projector Attributes

Brightness:

The brightness level (measured in lumens or ANSI-Lumens) is an indication of the level of light thrown out by the projector. Brightness is a lot more important for business use - this in view that many presentations are given in conference rooms with standard office lighting rather than in reduced ambient light. This means that the image needs to be bright enough to be seen, otherwise the projection would look washed out.

For small boardrooms and presentations with a lot of ambient light, a brightness of around 1000 to 1500 lumens should normally be fine. However, keep in mind that the projector brightness required depends on the projected screen size, the level of ambient light, and the projection screen gain (more on this in our projector screen guide).

For home theater applications, a high brightness level is not important. Some video projectors intended for home theater use come with bulb setting to enable the user to dim the light source for improved viewing and deeper blacks when viewing takes place in a darkened room.

Contrast:

As discussed in our Contrast Ratio article, even a minimal level of ambient light may render a high contrast image of say 5000:1 similar to one with a contrast ratio of 500:1. This means that though a minimum level of contrast is important for the eye to perceive a sufficient bright image, yet contrast is not an important attribute in business applications, nor it is in home use if one will be using the projector in the living room with the lights turned on.

In reality, anything above 400:1 for the contrast ratio would not be perceived by the eye if viewing does not take place in a completely darkened environment. In addition, due to the eye's contrast sensitivity function, a contrast ratio of say 2000:1 would not be perceived as five times better than one with a contrast ratio of 400:1. Therefore, pay more and go for a high contrast ratio only in the case of a home theater projector and as long as viewing takes place under controlled lighting.

Color, Gray-Scale Performance, and Smooth Video Playback:

These are all attributes that are more critical in home theater applications. In fact, color accuracy with natural-looking skin tones and capability to present subtle detail in bright and dark areas of the image matter more to the home user.

Similarly, the projector's ability to present smooth, video playback with no added motion artifacts, when presenting fast action sports and movie scenes, is of prime importance in any home theater application.

LCD or DLP:

It all depends. Strictly speaking, both technologies can do a good job in either of these applications in that advancement in technology has closed the gap between the two. Yet LCD projectors are normally the primary choice with business projectors in view that these still have a brightness edge over DLP.

On the other hand, DLP is still the favored technology when it comes to home theater use due to their improved black level performance and smoother looking projections that resembles more closely those at the movie theater.

Portability:

This is a major issue with the business video projector. Smaller and lighter is better, especially if you travel frequently. Weight is more of an issue for the business user. Business mobile professionals will want to hook up a lightweight projector to a computer or laptop, projecting an image on a large screen or wall for presentations.

Most business-oriented projectors weigh just a few pounds - some very light business models weigh no more than three pounds! These video projectors usually come with carrying cases and wireless remote controls that enable the user to control not only the projector, but also to send commands to the PC through appropriate connectivity. Some remotes include an integrated laser pointer.

Most multimedia projectors under this category come with a small integrated speaker for the sound; more expensive projectors have security features such as locking cables, etc.

Portability issue is of no concern in the home theater. One would normally setup a fixed place for the projector. For home theater projectors, the best installation spot is on the ceiling. This means that some planning has to go into how it is best to run cables into the ceiling to connect your projector with the rest of your home theater gear.

Video Projector Connectivity

It is critical that your video projector comes equipped with the appropriate inputs to enable you to connect with your PC or laptop in the case of a business projector, and home theater gear, DVD, or HDTV set-top-box in the case of a home theater projector.

It is clear that connectivity requirements between these two video projector categories vary.

Most - but not all - models support component, composite, S-video, and RGB connectivity. Home theater projectors normally also include a DVI or an HDMI port; this is very useful when it comes to interconnecting with a compatible DVD player or HDTV set-top boxes.

One standard that is starting to show up more on video projectors, and that is most appropriate in the business arena, is the M1, EVC, or P&D standard; this is most commonly referred to as M1 or M1-DA.

The M1 connector allows for the same connectivity as DVI digital single or dual link or analog transmissions in the case of DVI-I. But the added advantage of the M1 over DVI is that the M1 also provides connectivity to the USB or FireWire port on your PC. The USB/FireWire connection is used to supply commands from the projector's remote control to the computer - thus allowing you to scroll through PowerPoint presentations, etc.

Our advice: Always check before you buy to be sure that the projector has the inputs you need.

Projector Resolution: SVGA, XGA or Widescreen (WVGA or WXGA)?

This refers to the native or optical resolution and measures the level of picture detail that the projector can handle without compressing (down-scaling) the number of pixels in the original video content. Downscaling degrades picture quality and leads to picture content loss.

This is probably by far the most important video projector attribute that differentiate business from home theater projectors. In reality, it is not the number of pixels but rather how these are arranged on the screen in terms of width vs height i.e. the native aspect ratio of the projector.SXGA (1280x1024) is currently the highest resolution available for portable projectors; these video projectors are relatively very expensive. Most common video projector resolutions in the 4:3 aspect ratio are XGA (1024x768 pixels) and SVGA (800x600 pixels).

Widescreen versions of SVGA (WVGA: 854x480) and XGA (WXGA: 1280x720) have also started to emerge. These enable better projections of widescreen 16:9 content.

Business Video Projectors: SVGA and XGA projectors are more suited for business presentations, with the higher resolution XGA projectors being more capable of showing fine detail in your slide show.

Many may thing that the higher the resolution the better - but this does not necessary apply in the case of the business projector. A word of caution here arise out of the fact that if the text on a PowerPoint slide makes use of a too small a font to show using an SVGA projector (and therefore it necessitates the need of an XGA projector), it means that probably, the audience at the very back would still not be able to read it. Surely, you do not want that. In these circumstances, the cheaper SVGA projector would - in most circumstances - be able to do more than a good job.

On the other hand, the XGA projector is the best option for presentations that include graphics, software demonstrations, or full Web pages; this resolution also represents a better match for laptop computer displays.

Home Theater Projectors: If you want to use a video projector to project a huge image on a screen in your home theater, then the higher the resolution, the better since you will be less likely to suffer from pixelation issues. It is true that pixelation disappears as one moves further away from the screen but in the home theater, many would prefer to move a little bit closer for a wider angle of view and a more immersing movie experience.

Although most SVGA projectors can display HD images from your HD cable tuner or satellite, they don't have enough resolution to do it justice. The two main HD resolution formats are 1080i (1920 x 1080 pixels) and 720p (1280 x 720 pixels). SVGA projectors, with 800 x 600 pixels of resolution, don't have the ability to display either format without downscaling.

Even with DVD content - which at 852x480, comes with a lower resolution than HDTV - the lower-priced SVGA projectors cannot do a good job with DVD movies. XGA, on the other hand, gets much closer but...

Both standard SVGA and XGA projectors have a native aspect ratio of 4:3, so the image corresponds to a standard computer screen or regular television. Widescreen content - such as that available from DVDs and HDTV programming - have an aspect ratio of 16:9. The best way to match this is to use a home theater projector with a widescreen native resolution; it is only in this way that you can avoid the letterboxing, image stretching, or image cropping, or other aspect ratio management techniques that are often used to present a 16:9 content on a 4:3 screen.

Widescreen projectors come in either WVGA or WXGA. Opting for the cheaper WVGA projector makes sense if you will be watching only DVD movies. For HDTV content, a WXGA projector is necessary. This will enable you to display all HDTV content up to 720p without re-scaling. You still will be able to see 1080i HDTV material on a WXGA projector but the projected image will have to be compressed to fit the 1920x1080 pixels in a 1080i or 1080p HDTV, in the available pixel field of a WXGA video projector.

(c) 2004/2005 www.practical-home-theater-guide.com. All rights reserved.

Andrew Ghigo A Telecoms/Electronics engineer by profession. Editor and publisher of http://www.practical-home-theater-guide.com - a comprehensive home theater guide to home theater systems, product reviews and home theater design.

This article is an excerpt from a series of informative guides appearing under the Projection Television section of the site.

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6 Steps To Getting A Perfect Projector

6 Steps To Getting A Perfect Projector
By Timothy Wong

Follow this step-by-step article, and you won't go wrong.

1. Low-cost projectors normally make two main sacrifices. The brightness, which is measured in ANSI lumens, will be relatively low, and the native resolution will be limited to 800x600. Neither one of these will be serious drawbacks providing you lower your room lights, draw the blinds, and there isnt too much detail in your slides. Home cinemas definitely do not require anything more. Movie enthusiasts are more likely to be concerned with the lamp life and replacement cost.

2. Image quality is obviously important but very hard to test based on specifications. A high contrast (500:1 or above) ratio adds depth to the picture and is one substantial benefit of projectors based on digital light processing (DLT), as opposed to the older LCD technology. Do keep in mind though; the optics and color balance cannot be assessed without consulting a review.

3. Where you will be using your projector also needs to be put into question. Size and weight are obviously very important if youll be moving the piece around a lot. If portability is a factor, aim for a projector that is less than 3kg. Small rooms will demand a quiet (below 33dB) projector with a flexible throw distance or how close or far away the screen must be. Most projectors can rotate or mirror their image to cope with ceiling mounting or rear projection.

4. Make sure the projector you are looking at covers all the signals you might want to feed it with. Common video formats are supported by almost all projectors, but high-resolution VGA signals arent. High quality pictures will only display at their best only on pricier projectors, with a 1,024x768 native resolution.

5. Top-of-the-range projectors have 2,000 ANSI lumens brightness or more to overpower brightly lit rooms. They also come with a handful of useful features that make presentations look and sound slicker, as well as making it easier for the presenter. Anti-theft features may also be something worth looking into.

6. After sales Warranty and support is definitely a must, especially for the heavier users. Make sure you have access to bulb replacements (or replacement service).

Recommended Minimum Specs-

Native Resolution: 800x600 Brightness: 1,100 ANSI Lumens Contrast Ration: 500:1 Lamp Life: 2,000 hours Check: Weight, throw distance and noise.

This article was written by Timothy Wong, a technology blogger.Visit his website at: http://www.timw.com

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The Home Theater Projector Are They Worth the Money?

The Home Theater Projector Are They Worth the Money?
By Nick Crane

When considering the visual component of your home theater system you are certain to look into the prospect of purchasing a home theater projector. A high quality home theater projector is a great way to start or improve on your in-home movie theater. A home theater projector works almost the same as a rear projection television. The only difference being, you guessed it, the location of the projector.

A rear projection television, as the name suggests, has the projector situated behind the television screen and projects an image onto the backside of it. A front projection television is most similar to the projector in a real theater, where images are projected from the back of the room to the front onto a large fabric screen.

The best feature, and reason that most people choose to buy a home theater projector, is the fact they can easily produce an image thats 200 measured diagonally. No other type of screen can do this. In fact, a standard CRT television can only reach a screen size of 40. Clearly, an image of this magnitude can only add to the true theater experience.

With a properly installed home theater projector, you can expect the images produced to be very near the highest quality of anything else on the market. Of course, the room must be darkened enough so that the image appears bright and vibrant, but this can be easily managed through the use of heavy drapes for large windows.

Certain types of projectors must be set up by trained professionals in order for a calibrated, clear image to be achieved. The type that you can easily set up yourself will initially cost less than one that has to be professionally installed. Having said that, professional installation is well worth the extra expense to achieve the clarity and create the ambiance of a night at the movie theater.

A home theater projector is always an expensive piece of equipment, but you can save money by only buying one powerful enough for the room that its going to be put in. One home theater projector varies in output strength to the next, so measuring the distance from the projector to the screen is essential to making an informed purchase.

Home theater projector manufacturers are plentiful, but its wise to stick with a well-known brand. Doing this ensures youll be getting a quality home theater projector and if ever your home theater projector should malfunction or otherwise need servicing, you'll be covered. Less-known or start-up companies may seem like a bargain at first blush, but typically can't offer the type of warranties or service you may want or need.

Nick Crane is a successful Webmaster and publisher of MyHomeTheaterZone.com Visit his site at http://www.myhometheaterzone.com for tips on selecting the right home theater seating.

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