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:
Mar. 23, 2004
Filed:
Jun. 21, 2000
Shinya Kondoh, Tokorozawa, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A ferroelectric liquid crystal display element holds a ferroelectric liquid crystal between a pair of substrates. A driving scheme includes a reset period having a switching period and a non-switching period which precede application of a selection pulse. During the switching period, a voltage exceeding a threshold voltage required to switch the ferroelectric liquid crystal is applied irrespective of the display data to be written to a pixel, and during the non-switching period, an ion electric field in the ferroelectric liquid crystal is aligned in such a direction that cancels the direction of an electric field produced by spontaneous polarization of the liquid crystal molecules. A voltage not exceeding the threshold voltage of the ferroelectric liquid crystal, preferably a voltage of 0 V, that is, no voltage, is applied during the non-switching period.