Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2005-11-04
2009-12-08
Dudek, James A (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
Reexamination Certificate
active
07630039
ABSTRACT:
A liquid crystal display device of the present invention is composed of a λ/4 plate1, a λ/2 plate2, and a polarizing plate3which are provided in this order from the side of a liquid crystal layer10. Here, an angle formed between an absorption axis of the polarizing plate3and an absorption axis of the λ/2 plate2is about 45°, an in-plane retardation of the λ/2 plate2is set to a value obtained by adding λ/4 to an in-plane retardation of a retardation plate1, desirably, the λ/4 plate1, and an optical axis of the λ/4 plate1and an optical axis of the λ/2 plate2are orthogonal to each other. In this configuration, the optical axis of the λ/4 plate1is placed at 150°, the optical axis of the λ/2 plate2is placed at 60°, and the absorption axis of the polarizing plate3is placed at 15°. This configuration improves display characteristics, that is, performs bright display at a higher contrast ratio and in a wider viewing angle with less dependence on visual field, thereby realizing an excellent reflection-type liquid crystal display device that is very easy to view even in a relatively dim place such as an indoor environment.
REFERENCES:
patent: 5061042 (1991-10-01), Nakamura et al.
patent: 5737044 (1998-04-01), Van Haaren et al.
patent: 6108064 (2000-08-01), Minoura et al.
patent: 6137556 (2000-10-01), Yamahara
patent: 6141075 (2000-10-01), Ohmuro et al.
patent: 6226064 (2001-05-01), Shimada et al.
patent: 6341002 (2002-01-01), Shimizu et al.
patent: 6433845 (2002-08-01), Suzuki et al.
patent: 6781759 (2004-08-01), Wakita et al.
patent: 7015995 (2006-03-01), Ikeno et al.
patent: 2002/0075432 (2002-06-01), Yamaguchi et al.
patent: 2003/0123000 (2003-07-01), Sugiura et al.
patent: 2005/0248698 (2005-11-01), Okamoto et al.
patent: 1462987 (1977-01-01), None
patent: 60-256121 (1985-12-01), None
patent: 62-210423 (1987-09-01), None
patent: 6-11711 (1994-01-01), None
patent: 6-175126 (1994-06-01), None
patent: 6-337421 (1994-12-01), None
patent: 10-153802 (1998-06-01), None
patent: 11-142836 (1999-05-01), None
patent: 11-295526 (1999-10-01), None
patent: 11-311784 (1999-11-01), None
patent: 2000-035570 (2000-02-01), None
patent: 2000-171788 (2000-06-01), None
patent: 2001-004999 (2001-01-01), None
patent: 2001-154190 (2001-06-01), None
patent: WO98/52093 (1998-11-01), None
The Journal of the Institute of Television Engineers of Japan; vol. 50, No. 8, pp. 1091-1095; Jul. 20, 1996.
Ohmuro Katsufumi
Sugiura Norio
Tashiro Kunihiro
Yoshida Hidefumi
Dudek James A
Greer Burns & Crain Ltd.
Sharp Kabushiki Kaisha
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