Normally white twisted nematic LCD with positive and negative re

Details Normally white twisted nematic LCD with positive and negative re Normally white twisted nematic LCD with positive and negative re

1995-11-15

1997-08-12

Gross, Anita Pellman

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

349120, G02F 11335

Patent

active

056571402

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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