Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1994-12-19
1996-06-04
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 67, 359102, G02F 11335
Patent
active
055238670
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.degree.-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.
REFERENCES:
patent: 5016988 (1991-05-01), Iimura
patent: 5056896 (1991-10-01), Iimura et al.
patent: 5142393 (1992-08-01), Okumura et al.
patent: 5189538 (1993-02-01), Arakawa
Ohgawara et al "A Color STN Display with Two Retardation Compensating Films" SID 89 Digest--May 1989--pp. 390-393.
Akatsuka Minoru
Sawada Kazutoshi
Sohda Yuji
Asahi Glass Company Ltd.
Duong Tai V.
Sikes William L.
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