A digital projector, also called a digital projection display system, is a specialized computer display that projects an enlarged image on a movie screen. Such devices are commonly used in presentations.
There are two main types of digital projection display systems. One for each of the primary colors (red, green, and blue), the older, less expensive type employs three transparent liquid-crystal-display ( LCD ) panels. Depending on the image data received from the computer, the light transitivity of each pixel varies. The light from a lamp is directed through the LCD panels, collimated using a lens, and projected onto a …