Ricoh KW5708, Service Training

Page: 38 / 61

Slide 38
LCD Projectors
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LCD projectors appeared during the early 1990s, and are
now the main type of projector.
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Three LCDs receive electrical signals from an image-
generating device. One receives signals for the red part of
the image, one the green, and one the blue. In this way,
each LCD holds a pattern of pixels.

Then, red light is shone through the LCD with the red part
of the image, and green and blue light are used for the
other two LCDs.
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After passing through the LCD filters, the three beams are
combined and projected.
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LCD projectors give bright, high-resolution output, and
they are easy to adjust. They are also cheap.