Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2007-02-13
2007-02-13
Dudek, James A. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S119000
Reexamination Certificate
active
10377660
ABSTRACT:
A positive uniaxial film14with a retardation of Rp [nm] in an in-plane direction is provided between a vertical alignment mode liquid crystal cell11and a polarizing plate12, and a negative uniaxial film15with a retardation of Rn [nm] in a thickness direction is provided between the liquid crystal cell11and a polarizing plate13. Further, when a parameter α1 [nm] relative to Rp is: α1=135−0.7×Rtac; and a parameter β1 [nm] relative to Rn is: β1=Rlc−65−1.4×Rtac, where Rtac [nm] is a retardation in a thickness direction of the respective triacetyl cellulose films12band13bof polarizing plates12and13, the retardations Rp and Rn are set to be values greater than 90% but smaller than 110% with reference to the parameters α1 and β1, respectively. This makes it possible to surely provide a vertical alignment mode liquid crystal display device which can maintain a high contrast when viewed from an oblique direction.
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Dudek James A.
Nixon & Vanderhye P.C.
Sharp Kabushiki Kaisha
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