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:
Jun. 27, 1989
Filed:
Aug. 27, 1987
Applicant:
Inventors:
Shigeru Morokawa, Higashi-yamato, JP;
Fuminori Suzuki, Tokorozawa, JP;
Assignee:
Citizen Watch Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307264 ; 307268 ; 307490 ; 350333 ;
Abstract
A selecting electrode drive circuit is capable of providing drive pulses of twice as high having an amplitude twice as large as the breakdown voltage of semiconductor devices used in the circuit. The drive pulses thus provided are applied to selecting electrodes of a matrix type display device and the driving circuit includes a pulse generator for generating a train of reference pulses, a power supply connected to the pulse generator for level-shifting the reference pulses by the crest value of the power supply and a switching circuit is powered by the power supply.