Planar polarizer for LCD projectors

Details Planar polarizer for LCD projectors Planar polarizer for LCD projectors

1997-12-11

1999-08-17

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 96, 359496, G02F 11335

Patent

active

059401494

ABSTRACT:
A liquid crystal display projector including a light source, a collimator lens, a planar polarization converter, a liquid crystal display panel, and projection lenses. The collimator lens is optically aligned to receive a beam of light from the light source and to produce a collimated light beam. The planar polarization converter is optically aligned in front of the collimator lens to receive the collimated beam of light. The polarization converter includes a prismatic film having a first prismatic surface, a reflective polarization film, and a quarter wave retarder film positioned between the prismatic film and the polarization film sheet. The prismatic surface has alternating transmissive prismatic facets and reflective prismatic facets positioned at supplementary base angles, the reflective prismatic facets positioned at a second base angle .beta. and the transmissive prismatic facets positioned at a first base angle generally equal to 180.degree.-.beta..

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