DAP type liquid crystal device with cholesteric liquid crystal b

Details DAP type liquid crystal device with cholesteric liquid crystal b DAP type liquid crystal device with cholesteric liquid crystal b

1993-01-05

1993-09-07

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 73, 359105, G02F 1133, G02F 11335, G02F 113

Patent

active

052434516

ABSTRACT:
Disclosed herein is a DAP type-ECB system liquid crystal display device comprising (1) a liquid crystal cell in which a liquid crystal layer is sandwiched between a pair of substrates each having at least one electrode, (2) a birefringent layer sandwiched between a substrate and the liquid crystal cell and (3) a pair of polarizers disposed on outer surfaces of the substrates. The birefringent layer comprises a liquid crystal compound showing a cholesteric liquid crystal phase or a polymer film obtained by quenching a polymer showing a cholesteric phase to fix the aligning direction of the polymer molecules, and refractive indexes n.sub.x, n.sub.y within a plane of the birefringent layer and the refractive index n.sub.z in the direction perpendicular to the plane have a relationship:

REFERENCES:
patent: 3888892 (1975-06-01), Leder
patent: 4701028 (1987-10-01), Clerc et al.
patent: 4813770 (1989-05-01), Clerc et al.
patent: 4844569 (1989-07-01), Wada et al.
patent: 5175638 (1992-12-01), Kanemoto et al.

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