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. 04, 1995
Filed:
Oct. 21, 1993
Tetsuo Murata, Tenri, JP;
Sharp Kabushiki Kaisha, , JP;
Abstract
In order to improve the contrast of a liquid crystal display device by the voltage equalization method, scanning side electrodes totaling D in number are scanned in line sequential fashion while applying a voltage between each selected scanning side electrode and each signal side electrode, the voltage applied being controlled in such a way that, during a total of D times of scanning of the scanning side electrodes for production of one frame, when a particular scanning side electrode and a particular signal side electrode are simultaneously in a select state, a voltage Vop is applied to the corresponding liquid crystal, and when the scanning side electrodes respectively are in a non-select state, which occurs the remaining (D-1) times for each of the scanning side electrodes, a voltage whose polarity is reversed in response to the select and non-select states of the signal side electrodes and whose absolute value is represented by .vertline.Vop/B.vertline., where B is the bias ratio, is applied to the corresponding liquid crystal. The bias ratio B can be varied to adjust the contrast of the liquid crystal display device, and it is possible to improve the contrast by increasing the bias ratio.