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:
Nov. 22, 1994
Filed:
Sep. 27, 1991
Hisao Okada, Ikoma, JP;
Kuniaki Tanaka, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A drive circuit for a display apparatus having parallel signal electrodes has at least one voltage selecting circuit, a plurality of signal voltage circuits, one selection signal circuit, and one control signal circuit. The voltage selecting circuit selects one of voltages having different levels in accordance with an input digital video signal. The signal voltage circuits are respectively provided for the signal electrodes, and include two signal lines which are disposed between the voltage selecting circuit and the respective signal electrode. Each of the two signal lines is provided with a input switch, a capacitor and an output switch. The selection signal circuit generates a signal for controlling the two input switches of one of the signal voltage circuits to alternatingly receive a selected voltage from the voltage selecting circuit. The control signal circuit controls the two output switches of the one signal voltage circuit to alternatingly output the voltages toward the respective signal electrode, in an inverted manner with respect to the control of the selection signal circuit.