Liquid crystal display device having at least one phase-differen

Details Liquid crystal display device having at least one phase-differen Liquid crystal display device having at least one phase-differen

1997-10-08

2000-11-07

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349118, 349119, 349 96, 349123, G02F 11335, G02F 11337

Patent

active

061444316

ABSTRACT:
A liquid crystal display device includes: a liquid crystal display element formed by sealing a liquid crystal layer in a space between a pair of light transmitting substrates, the liquid crystal layer being formed by a liquid crystal material so that .DELTA.n.multidot.d that is a product of the index anisotropy .DELTA.n of the liquid crystal material and a thickness d of the liquid crystal layer is more than 300 nm but less than 550 nm; a pair of polarizers disposed on both sides of the liquid crystal display element; and at least one piece of phase-difference plate between the liquid crystal display element and polarizers, wherein three principal refractive indices na, nb and nc of an index ellipsoid are related by na=nc>nb, the direction of one of na and nc is parallel to a surface of the phase-difference plate, and the index ellipsoid is inclined by rotating the direction of nb about an axis that is the direction of na or nc parallel to the surface of the phase-difference plate from a state parallel to a normal direction to the phase-difference plate surface into an inclined state. This structure eliminates a phase difference corresponding to a viewing angle of the liquid crystal display element, and achieves display of high quality images.

REFERENCES:
patent: 4813770 (1989-03-01), Clerc et al.
patent: 5189538 (1993-02-01), Arakawa
patent: 5426524 (1995-06-01), Wada et al.
patent: 5506706 (1996-04-01), Yamahara et al.
patent: 5528400 (1996-06-01), Awakawa
patent: 5777709 (1998-07-01), Xu

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