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:
May. 21, 1991
Filed:
Nov. 20, 1989
Masahide Uchida, Suwa, JP;
Fumio Shida, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A circuit for driving an active matrix liquid crystal display having M rows and N columns by video digital data of K bits is provided. The rows and columns intersect at a plurality of thin film transistors which form at least in part a pixel at each intersection of a column and row. An analog switch capable of ON and OFF state receives a video voltage, a discharge power supply voltage and a control signal and selectively outputs either the video voltage and the discharge power supply voltage to each column in response to a control signal. The video voltage varies in level sequentially increasing from the OFF state at least once each horizontal scanning period. A control receives the K bit digital input data and produces a control signal for controlling the time of the ON state of the analog switch in response to the input data. K is an integer at least equal to 1.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile