Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2005-08-30
2005-08-30
Parker, Kenneth (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C345S089000, C349S034000
Reexamination Certificate
active
06937309
ABSTRACT:
The liquid crystal display device is composed of at least one optical retardation compensator plate2(and3) inserted between a liquid crystal display element1and polarizer plates4and5. The liquid crystal display element1is composed of a pair of electrode substrates6and7and a liquid crystal layer8sealed therebetween. The polarizer plates4and5flank the liquid crystal display element1. The optical retardation compensator plate2(and3) has a negative refractive index anisotropy (na=nc>nb). The direction of a principal refractive index nb parallel to the normal to the surface and the direction of either a principal refractive index na or nc in the surface incline either clockwise or counterclockwise around the direction of the principal refractive index nc or na in the surface. Moreover, either the pretilt angle formed by the orientation films11and14and 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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Conlin David G.
Edwards & Angell LLP
Parker Kenneth
Sharp Kabushiki Kaisha
Tucker David A.
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