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. 13, 1993
Filed:
Jul. 12, 1991
Jun Nakanowatari, Miyagi, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
A ferroelectric liquid crystal device includes a pair of substrates which has electrodes formed in an opposing spatial relation to each other. At least one of the electrodes is optically transparent. A parallel aligned, obliquely evaporated film is formed on each electrode. The paired substrates are sealed to provide a cell. A ferroelectric liquid crystal composition to which an ionic substance having a great mobility is added is placed in the cell to obtain the liquid crystal device. The addition of the ionic substance results in a low switching threshold voltage, a high response speed and good memory reproducibility. When the device is applied with an AC electric field prior to driving, display contrast is significantly improved.