Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1996-08-15
1997-12-16
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 99, 349102, 349118, 349121, G02F 11335
Patent
active
056991371
ABSTRACT:
It is an object of the invention to provide a liquid crystal display device capable of obtaining a wide viewing angle without coloration caused by a viewing angle. A liquid crystal display cell is disposed between a pair of polarizers, and between the liquid crystal display cell and the pair of polarizers, first optical compensation plates are disposed at the side of the liquid crystal display cell, and second optical compensation plates are disposed at the side of the polarizer. The first optical compensation plates have a refractive index anisotropy in the plane, and the refractive index thereof in the thickness direction is nearly equal to the refractive index of a minimum value in the plane, whereas the second optical compensation plates have no refractive index anisotropy in the plane, the refractive index in the thickness direction is greater than the refractive index in the plane, and a positive phase difference is expressed by inclination from the normal direction. By the optical compensation plates, the coloration of the display in the display plane of the liquid crystal display device and in the viewing angle direction inclined in a direction parallel to the display plane from the normal direction of the display plane can be compensated, so that a wide viewing angle of a high contrast is obtained.
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Conlin David G..
Duong Tai V.
Neuner George W.
Sharp Kabushiki Kaisha
Sikes William L.
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