Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2008-05-27
2008-05-27
Dudek, James A. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S113000, C349S114000, C349S119000
Reexamination Certificate
active
07379133
ABSTRACT:
A reflective liquid crystal device includes a reflecting electrode (14) provided on the liquid crystal side of a first substrate (10), and a first retardation plate (106), a second retardation plate (116) and a polarizer (105), which are provided on the side of a second substrate (20), which is opposite to the liquid crystal side thereof. The twist angle and Δnd of the liquid crystal are 230 to 260 degrees and 0.70 μm to 0.85 μm, respectively. Δnd of the first retardation plate is 150±50 nm, and Δnd of the second retardation plate is 610±60 nm. The angle formed by the transmission axis or absorption axis of the polarizer and the optical axis of the second retardation plate is 10 to 35 degrees, and the angle formed by the optical axis of the first retardation plate and the optical axis of the second retardation plate is 30 to 60 degrees. As a result, a bright image display having high contrast can be obtained.
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Korean Examination Result.
Yamaguchi, H. et al, “P-43: A reflective Color STN-LCD with a Single Polarizer and Double Retardation Films”, SID Int'l Symposium Digest of Technical Papers, Boston, May 13-15, 1997, pp. 647-650.
Communication from European Patent Office re: counterpart application.
Communication from Japanese Patent Office regarding counterpart application.
Communication from European Patent Office regarding counterpart application.
Dudek James A.
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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