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:
Jun. 02, 1992
Filed:
Dec. 09, 1988
Applicant:
Inventors:
Hiroshi Wada, Suwa, JP;
Chiyoaki Iijima, Suwa, JP;
Hiroshi Ohara, Suwa, JP;
Yoichi Momose, Suwa, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G02F / ; G02F / ;
U.S. Cl.
CPC ...
359 53 ; 359 73 ; 359 93 ; 359102 ;
Abstract
An electro-optical device which includes a super twisted nematic liquid crystal display cell and a compensating cell disposed between a pair of polarizers. Each of these cells is characterized by a plurality of parameters including refractive index dispersion, refractive index anisotropy, layer thickness and twist angle. At least one of the parameters characterizing the liquid crystal display cell differs in value from the corresponding parameter characterizing the compensating cell.