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. 31, 2004
Filed:
Jun. 18, 2001
Applicant:
Inventors:
Hajime Akimoto, Oume, JP;
Hideo Satou, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G 3/36 ;
U.S. Cl.
CPC ...
G09G 3/36 ;
Abstract
By changing circuit connections at predetermined 4 timings, a switch feed through offset cancel circuit which permits canceling fluctuation in output offset of an analog picture image signal voltage due to fluctuation of semiconductor elements characteristics in the circuit. Thereby, a uneven brightness in a form of vertical stripe shape, which deteriorates picture quality, due to fluctuation in switch feed through charges of an offset cancel circuit is eliminated in a TFT LC display device having a buffer amplifier.