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:
Aug. 20, 2013
Filed:
Apr. 17, 2008
Applicant:
Atsushi Hirama, Chiba, JP;
Inventor:
Atsushi Hirama, Chiba, JP;
Assignee:
Lapis Semiconductor Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G 3/36 (2006.01); G09G 3/32 (2006.01); H03M 7/34 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a liquid crystal drive device comprising a first gradation voltage generating circuit having a plurality of first wirings led out from a first string resistor thereof, a second gradation voltage generating circuit having a plurality of second wirings led out from a second string resistor thereof having a resistance value higher than the first string resistor and respectively connected to voltage-follower connected op amplifiers, a plurality of DA converters to which the first wirings and the op amplifiers are respectively connected, and an output op amplifier connected to the DA converters respectively.