Liquid crystal display having an off-axis full-color holographic

Details Liquid crystal display having an off-axis full-color holographic Liquid crystal display having an off-axis full-color holographic

1995-12-26

1997-03-04

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 9, 349 96, 349106, G02F 11335

Patent

active

056085524

ABSTRACT:
A full-color liquid crystal display employing an off-axis holographic color filter. The liquid crystal display comprises a liquid crystal spatial light modulator that includes a mosaic of electrically independent picture elements. An illumination source is provided that produces nearly collimated white predominantly S polarized illuminating light. The holographic color filter is disposed adjacent the liquid crystal spatial light modulator that comprises three layers of overlapping holographic lenses designed to focus red, green, and blue light, respectively, onto corresponding picture elements of the spatial light modulator. A prism element is disposed adjacent to the holographic color filter for coupling the illuminating light from the illumination source to the holographic color filter. A polarizer is disposed on an output surface of the prism element opposite from the holographic color filter that transmits P polarized light but blocks S polarized light. A projection optical system is disposed to receive P polarized light transmitted by the polarizer and produce an image for viewing.

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patent: 5333072 (1994-07-01), Willet
patent: 5387991 (1995-02-01), Mitsutake et al.

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