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:
Jul. 28, 1992
Filed:
Nov. 22, 1989
Applicant:
Inventors:
Mitsuru Kano, Furukawa, JP;
Takemi Akimoto, Furukawa, JP;
Assignee:
Alps Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
359 73 ; 359 96 ; 359102 ;
Abstract
An ingenious STN type liquid crystal device having a layer of phase film and comprising a liquid crystal composition that contains a two-color pigment as additive for compensation of the color of the device per se is disclosed. Such a device has a clear black and white display effect and can be manufactured at a low cost. Moreover, since only a small amount of pigment is used as additive, the original drive characteristics, contrast and brightness of the device is not adversely affected by the pigment.