Reflective liquid crystal display overhead projection system using a reflective linear polarizer and a fresnel lens
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United States of America Patent
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-
Jul 26, 1994
Grant Date -
N/A
app pub date -
Dec 31, 1992
filing date -
Dec 31, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A reflective liquid crystal display overhead projection system. The projection system includes a reflective polarizer, a phase modulating liquid crystal display on the reflective polarizer, and a fresnel lens on the liquid crystal display. Unpolarized light rays are directed toward the fresnel lens, pass through the liquid crystal display, and are reflected and polarized by the reflective polarizer. The light rays then pass back through the liquid crystal display and the fresnel lens and on toward a projector head, where the light rays are analyzed by a polarizer and projected toward a screen.
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Cited Art Landscape
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