LCD Projector

An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. It is a modern equivalent of the slide projector or overhead projector. To display images, LCD (liquid-crystal display) projectors typically send light from a metal-halide lamp through a prism or series of dichroic filters that separates light to three polysilicon panels – one each for the red, green and blue components of the video signal. As polarized light passes through the panels (combination of polarizer, LCD panel and analyzer), individual pixels can be opened to allow light to pass or closed to block the light. The combination of open and closed pixels can produce a wide range of colors and shades in the projected image.

Metal-halide lamps are used because they output an ideal color temperature and a broad spectrum of color. These lamps also have the ability to produce an extremely large amount of light within a small area; current projectors average about 2,000 to 15,000 American National Standards Institute (ANSI) lumens.

Other technologies, such as Digital Light Processing (DLP) and liquid crystal on silicon (LCOS) are also becoming more popular in modestly priced video projection.

Read more about LCD Projector:  Projection Surfaces, Throw, History

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LCD Projector - History
... The LCD projector was invented by American inventor Gene Dolgoff ... He began working on it in college in 1968 as a way to produce a video projector that would be brighter than the then-available 3CRT projectors ... took him until 1984 to get an addressable LCD, which is when he built the world's first LCD projector ...
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... Each classroom at Meadow Ridge has an overhead LCD projector for optimum display of information and instruction ... They can use the LCD projector to, amongst other things, watch social studies videos and learn project guidelines ...