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:
May. 20, 2003
Filed:
Oct. 19, 2000
Yasushi Kaneko, Sayama, JP;
Makoto Arai, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
With a liquid crystal display device comprising an STN liquid crystal element ( ) comprised of 200° to 260° twist aligned nematic liquid crystal ( ) sandwiched between a first substrate ( ) thereof, provided with a reflector ( ) and first electrodes ( ), and a second substrate ( ) thereof, provided with second electrodes ( ), a retardation film ( ), and a polarizing film that are disposed on the outer side of the second substrate ( ) of the STN liquid crystal element, black display of low reflectance can be obtained_in all wavelength regions, thereby enabling bright display in high contrast to be effected by setting a &Dgr;nd value of the STN liquid crystal element indicating a birefringent tendency thereof in a range of 0.7 to 0.8 &mgr;m, a retardation value indicating a birefringent tendency of the retardation film ( ) in a range of 0.35 to 0.40 &mgr;m, and an intersection angle formed by a phase delay axis of the retardation film ( ) and an absorption axis or a transmission axis of the polarizing film ( ) in a range of 30° to 45°.