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 the modern equivalent of the slide projector or overhead projector. To display images, LCD (liquid crystal display) projectors typically send light from a halogen lamp through three LCD panels -- one each for the red, green, and blue components of the video signal. As light passes through the panels, 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. Halogen 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 2,000-4,000 ANSI lumens. Newer technologies, such as DLP and LCOS are becoming more popular in video projection. In practice, the term "LCD Projector" is often used as a catch-all for any type of computer projector, regardless of the technology being used. |
