Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2005-06-02
2009-08-18
Nelms, David (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S117000, C349S119000, C349S120000, C349S121000, C349S102000, C349S103000, C349S104000, C349S105000
Reexamination Certificate
active
07576820
ABSTRACT:
A liquid crystal display apparatus, provided with liquid crystal compensation plates and λ/4 plates on both sides of a liquid crystal cell, in a sequence that the liquid crystal compensation plates, then the λ/4 plates. Further provided is Rth compensation film between the λ/4 plate and linear polarization film. Set substantially at zero is a retardation Rth1in a perpendicular direction in a range from the linear polarization films to the λ/4 plates, excluding the λ/4 plates. This gives a retardation (in a perpendicular direction) for optically compensating the liquid crystal cell a closer position to the liquid crystal cell. As a result, a broad angle of visibility can be maintained, without losing a balance between viewing angle characteristics from the above position (or the bottom position) and those from the right position (or the left position), while it is possible to prevent contrast ratio in a front direction from being lowered. Therefore, an LCD having good display quality can be realized.
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Chen et al. “Optimum Film Compensation Modes ofr TN and VA LCDs”, SID 98 Digest, (1998), pp. 315-318.
Miyachi Koichi
Yamahara Motohiro
Nelms David
Nguyen Hoan C
Nixon & Vanderhye P.C.
Sharp Kabushiki Kaisha
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