The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2001
Filed:
Aug. 19, 1998
Hisanori Yamaguchi, Ishikawa, JP;
Tomoaki Sekime, Ishikawa, JP;
Yoshio Iwai, Ishikawa, JP;
Tetsu Ogawa, Ishikawa, JP;
Matsushita Electric Industrial Co. Ltd., Osaka, JP;
Abstract
A reflective liquid crystal display device of the present invention has the following construction. Only one polarization film is needed. The twist angle of the nematic liquid crystal layer is set in the range of 0° to 90°. The product of the birefringence of the nematic liquid crystal layer &Dgr;n,and the thickness of the liquid crystal layer d,, &Dgr;n,·d,, is in the range of 0.35 &mgr;m to 0.50 &mgr;m. The birefringence difference, &Dgr;R=R,−&Dgr;n,·d,is in the range of −0.20 &mgr;m to 0.00 &mgr;m. When a reflective liquid crystal display device is seen from a side of a substrate positioned at the upper side, the direction of the liquid crystal which is twisted to a side of a substrate positioned at the lower side is designated as the positive direction, &phgr;,represents an angle between the base line and the longer axis direction of the liquid crystal molecule which is positioned most closely to a first substrate, &phgr;,represents an angle between the base line and the retardation axis direction of the polymer film, &phgr;,represents an angle between the base line and the adsorption axis direction of the polarization film, &phgr;,−&phgr;,is in the range of 70° to 110°and &phgr;,−&phgr;,is in the range of −90° to −60°.