The motors tilt their mirrors up to 20 degrees at incredible speeds. This allows the mirrors to modulate light from a lamp, and send the "modulated signal" out through a lens, on to a screen. The most amazing part of DLP micro mirrors, is the scale of size. The 480,000 mirrors (actually 580,000 are used), hinges and motors are packed onto a "wafer" a bit larger than your thumbnail. LCD: LCD stands for liquid crystal display and comes in many forms, sizes, and resolutions. Its primary purpose is to present a digital image for viewing. A common use of LCDs is as a display on a notebook computer. Until recently, it was tough to find a decent 1,000-lumen projector that listed for less than $4,000. Now, you can pick up new 1,000-lumen LCD that the 6.6-pound projector builds on award-winning display technology to provide improved video imaging in a lightweight, easy-to-use design. Introduced at three 0.7-inch LCD display panels produce a native SVGA (800 x 600) resolution and a reported contrast ratio of 400:1.

Most include manual or powered zoom and focus, full remote control, enhanced video and data capabilities and increased menu features. $5,000.00 to $8,000.00 Designed for the professional mobile presenter or permanent installations, these SVGA and XGA high lumen projectors range from 1,000 to over 1,600 lumens with weights under 14 lbs. Over $8,000.00 These are usually projectors with either XGA(1024 x 768) or SXGA (1280 x1024) native or true resolution incorporating a minimum of 1,000 lumens of brightness Projector warranties vary from brand to brand. However, they usually have at least one year or more coverage of all parts except the lamp. The lamp will sometimes have a 90 day warranty. Some manufacturers also offer a 24 hour replacement service. In some cases, this may cost extra. Contrast Ratio is the ratio between the whitest and blackest portions of an image. The higher the contrast ratio the greater the ability of a projector to show subtle color details and tolerate extraneous room light.

Your Application If you are giving a training presentation, you will probably need a brighter projector so the participants can read detail and take notes. A presentation using graphics and/or video will be visually less demanding and can be viewed in a darkened room. Your Screen Sufficient light reflection is provided in most screens on the market, thus making a low brightness projector look good in the right setting. The Number of People The image size increases as the number of people in the room increases. This reduces the brightness of the projector since the light is spread over a larger area. Another important thing to think about when buying a projector is the weight of the unit. If you travel quite a bit, you may want a very light weight unit. If you do not travel and want more features on the projector, you may opt for a heavier model. The Four weight classes of projector are as follows: Ultra-Mobile Ideal for the Traveling presenter. Typically weighing under 8 lbs, these machines provide a great low-weight-to-brightness ratio while maintaining the desired data resolution and video output. On the down side, some of the lightweight projectors sacrifice features such as power zoom, power focus, and remote control capabilities which can weigh the projector down.

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