Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2004-12-21
2009-06-23
Qi, Mike (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S121000, C349S005000
Reexamination Certificate
active
07551250
ABSTRACT:
A liquid crystal display device capable of obtaining a high contrast ratio within a range of entry angles of source light to an optical modulation device of a projection display apparatus has a liquid crystal panel operating in a twisted nematic mode, a first optical compensating plate disposed at the light-entry side of the liquid crystal panel, and a second optical compensating plate disposed at the light-exit side thereof. The respective optical compensating plates hybrid-aligns liquid crystal molecules having a negative birefringence, a phase retardation in the normal direction thereof of 10 nm or more and 30 nm or less, and fast axis directions, as seen in the respective normal directions, intersect each other at an angle other than a right angle.
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Oliff & Berridg,e PLC
Qi Mike
Seiko Epson Corporation
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