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:
Apr. 07, 1998
Filed:
Mar. 25, 1996
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A color liquid crystal display device comprises a liquid crystal cell having liquid crystal molecules twisted by 90.degree., two polarization plates, a reflector and two retardation plates. The product .DELTA.n.d of the refractive anisotropy .DELTA.n and the LC layer thickness d of the liquid crystal cell, the retardations of the retardation plates, the directions of the transmission axes of the polarization plates and the phase delay axes of the retardation plates are set in such a way that the color of outgoing light changes to red, green, blue, black or white in accordance with an applied voltage. The transmission axis of one of the polarization plates is set in a direction of 110.degree. to 130.degree. in an opposite direction to the twist angle of the liquid crystal molecules and the transmission axis of the other of the polarization plates is set in a direction of 127.degree. to 140.degree. in an opposite direction to this twist angle.