Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1998-03-31
2000-02-08
Parker, Kenneth
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
G02F 11335
Patent
active
060233176
ABSTRACT:
A normally white twisted nematic liquid crystal display is provided for outputting improved viewing characteristics which are defined by high contrast ratios and reduced inversion. The display includes both positive and negative retardation films, the negative films being defined by n.sub.x =n.sub.y >n.sub.z where the "z" direction is substantially perpendicular to the film plane and the "x" and "y" directions are substantially parallel to the film plane. According to certain embodiments, a pair of positive and a pair of negative retardation films are provided such that the two positive retarders sandwich both the liquid crystal layer and the negative retarders therebetween. By providing the positive and negative retarders with specific retardation values and/or ratios, improved viewing characteristics are provided.
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Patent Abstracts of Japan, 07253573, Mar. 10, 1995.
VanderPloeg John A.
Xu Gang
OIS Optical Imaging Systems, Inc.
Parker Kenneth
Rhoa Joseph A.
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