Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1998-04-06
2000-10-24
Parker, Kenneth
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 85, G02F 1141, G02F 11333
Patent
active
06137556&
ABSTRACT:
The liquid crystal display device is composed of at least one optical retardation compensator plate 2 (and 3) inserted between a liquid crystal display element 1 and polarizer plates 4 and 5. The liquid crystal display element 1 is composed of a pair of electrode substrates 6 and 7 and a liquid crystal layer 8 sealed therebetween. The polarizer plates 4 and 5 flank the liquid crystal display element 1. The optical retardation compensator plate 2 (and 3) has a negative refractive index anisotropy (n.sub.a =n.sub.c >n.sub.b). The direction of a principal refractive index n.sub.b parallel to the normal to the surface and the direction of either a principal refractive index n.sub.a or n.sub.c in the surface incline either clockwise or counterclockwise around the direction of the principal refractive index n.sub.c or n.sub.a in the surface. Moreover, either the pretilt angle formed by the orientation films 11 and 14 and the longer axes of liquid crystal molecules in the liquid crystal layer or the value of applied voltage for displaying halftone obtained by applying to the liquid crystal a voltage that is close to the threshold voltage for the liquid crystal is set within such a range that tone reversion does not occur in the opposite viewing direction when halftone is being displayed.
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Eisenhut Heidi L.
Parker Kenneth
Sharp Kabushiki Kaisha
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