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. 29, 1991
Filed:
Jan. 18, 1991
Kimishige Nakamura, Osaka, JP;
Shuji Kitamura, Kyoto, JP;
Toyokazu Okada, Osaka, JP;
Kazuaki Sakakura, Osaka, JP;
Hitoshi Kikui, Osaka, JP;
Koji Higashi, Osaka, JP;
Keizo Ichinose, Osaka, JP;
Sumitomo Chemical Co., Ltd., Osaka, JP;
Abstract
A phase retarder obtained by uniaxially stretching a thermoplastic resin film, whose retardation value ranges from 30 to 1200 nm and whose color difference .DELTA.E* is not more than 30 as defined with the phase retarder being set between crossed polarizers in such a manner that the optical axis thereof makes an angle of 45.degree. with respect to the planes of polarization of the polarizers, and a liquid crystal display using the phase retarder are disclosed. The phase retarder has a fixed optical axis, a retardation value suited for new optical uses including liquid crystal displays, and freedom from optical color unevenness. The liquid crystal display using the phase retarder exhibits markedly improved image quality.