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:
Jul. 20, 1993
Filed:
Dec. 21, 1990
Takahiro Fuse, Akigawa, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
A voltage generating circuit generates voltages of various voltage levels for driving a liquid crystal display device. A first voltage source generates first voltage for driving a liquid crystal device while there is provided a first switched capacitor circuit which inverts the first voltage in polarity to generate second voltage for driving a liquid crystal display device, and a second voltage source generates third voltage for driving the display device while there is provided a second switched capacitor circuit which inverts the third voltage in polarity to generate fourth voltage for driving the display device. Further, the first switched capacitor circuit is integrated together with a liquid-crystal driving circuit which selectively outputs the first and second liquid crystal driving voltage while the second switched capacitor circuit is integrated together with a liquid crystal driving circuit which selectively outputs the third and fourth liquid-crystal driving voltage.