Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1997-02-26
1999-07-13
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349143, G02F 11335
Patent
active
059233923
ABSTRACT:
The liquid crystal display device of the present invention comprises a liquid crystal layer of a nematic liquid crystal having positive dielectric anisotropy and including a chiral material, the liquid crystal layer being interposed between a pair of substrates with transparent electrodes each having an aligning layer which are arranged substantially in parallel to provide a twist angle of 160-300.degree., a driving means to apply a voltage across the electrodes attached to the substrates which interpose the liquid crystal layer, a pair of polarizing plates arranged outside the liquid crystal layer, and at least one birefringent plate provided between the liquid crystal layer and the polarizing plate at at least one side of the liquid crystal layer, wherein the product .DELTA.n.sub.1 .multidot.d, of the anisotropy of refractive index .DELTA.n, of liquid crystal molecules in the liquid crystal layer and the thickness d, of the liquid crystal layer is in a range of 0.4-1.5 .mu.m, and three main refractive indices n.sub.x, n.sub.y and n.sub.z of the birefringent plate are in a relation of n.sub.x .gtoreq.n.sub.z >n.sub.y where n.sub.x and n.sub.y respectively represent the refractive indices in the direction of film plane of the birefringent plate (provided n.sub.x >n.sub.y) and n.sub.z represents the refractive index in the direction of film thickness of the birefringent plate.
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Kinugawa et al "640.times.400 Pixel LCD Using Highly Twisted Birefringence Effect with Low Pretilt Angle" pp. 122-125 -SID 86 Digest-1986.
Akatsuka Minoru
Sawada Kazutoshi
Sohda Yuji
Asahi Glass Company Ltd.
Duong Tai V.
Sikes William L.
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