Projection type liquid crystal display apparatus

Details Projection type liquid crystal display apparatus Projection type liquid crystal display apparatus

1996-07-26

1997-12-30

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

349 7, 353 70, G02F 11335, G03B 2100

Patent

active

057036632

ABSTRACT:
The projection type liquid crystal display apparatus of the invention includes: a light source; a liquid crystal display device; and a projection lens. In the projection type liquid crystal display apparatus, the projection lens and the liquid crystal display device are arranged to satisfy the relationship: .theta..sub.LC-max -1.degree..ltoreq..theta..sub.LENS .ltoreq..theta..sub.LC-max +1.degree., where .theta..sub.LENS is a collection angle of the projection lens and .theta..sub.LC-max is a maximum viewing angle of the liquid crystal display device at which a contrast ratio of an image light beam emitted through the projection lens CR.sub.PROJ is equal to a prescribed contrast ratio CR.sub.TARGET, and CR.sub.PROJ is calculated by the following equation:

REFERENCES:
patent: 5467207 (1995-11-01), Forkner et al.
patent: 5612797 (1997-03-01), Clarke
patent: 5622417 (1997-04-01), Conner et al.

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