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. 03, 1990
Filed:
Oct. 17, 1988
Tetsushi Yoshida, Tokyo, JP;
Ken Kozima, Tokyo, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A liquid crystal composition having a positive dielectric anisotropy contains 20 wt % to 70 wt % of a first liquid crystal material consisting of at least one liquid crystal compound represented by a formula ##STR1## (wherein R.sub.1 represents a linear alkyl group having 2 to 9 carbon atoms and R.sub.2 represents a linear alkyl group or alkoxy group having 2 to 9 carbon atoms), and 30 wt % to 80 wt % of a third liquid crystal material consisting of at least one liquid crystal compound in which a value of a dielectric anisotropy .DELTA..epsilon. is negative or substantially '0'. The liquid crystal composition optionally contains 10 wt % or less of a second liquid crystal material consisting of at least one liquid crystal compound having a positive dielectric anisotopy .DELTA..epsilon.. A liquid crystal display device is arranged such that the liquid crystal composition is interposed between a pair of substrates on which electrodes are formed.