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 Are you shopping for a new overhead projector? Are you searching for plasma projectors? We carry a great selection of projectors from all the top manufacturers. We can help you find everything you need for your school or office.Resolution can be defined as the number of pixels used by the projector to create an image. The higher the resolution, the better sharpness and clarity of the picture on the screen. Usually quoted in two numbers, (1024 x 768) The first number represents the number of pixels across the screen. The second number represents the number of pixels from top to bottom. The different types of resolutions are as follows: Resolution Pixels Comments VGA 640 x 480 The lowest resolution and the least expensive. SVGA 800 x 600 Many laptops are SVGA resolution, thus making SVGA a popular choice. XGA 1024 x 768 With new products coming out in XGA, this resolution is the second most popular. XGA projectors tend to be more expensive than SVGA projector but prices are dropping due to the increased use of XGA laptop computers. SXGA 1280 x 1024 SXGA products are geared towards high-end personal computers and low end workstations. They are often used in situations where acute resolution of small details is needed. UXGA 1600 x 1200 UXGA is aimed at workstation applications with very high resolution. There are not very many products that have UXGA native resolution. Lamp life is commonly discussed in terms of " Half Life". This simply means the manufacture has set a limit on what they feel is the quality life of the lamp. If the lamp half life is 2000 hours, the lamp will generally last much longer although the brightness of the image may deteriorate. For example, on an LCD projector, the lamp half life is generally 2000 hours. The image brightness is normally above 85% of the original brightness up to 2000 hours. After 2000 hours you may see a drastic reduction in brightness. DLP projectors normally have less of a life and the brightness generally starts deteriorating before the half life. DLP & LCD Digital Light Processing (DLP): The commercial name for this technology from Texas Instruments (TI): The technology inside is often referred to as either "micro-mirrors", or DMD: It works this way: build a few hundred thousand tiny mirrors, and line them up in 800 rows of 600 mirrors each. Now attach a hinge to each of those 480,000 mirrors. Attach each of those 480,000 hinges to its own very tiny motor! Power each motor with electrostatic energy! ©2003 www.overhead-projector.com All rights reserved. |
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