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:
Dec. 28, 2010
Filed:
Aug. 30, 2006
Applicants:
Noboru Okuzono, Kanagawa, JP;
Takashi Morigami, Shiga, JP;
Tsukasa Yasuda, Shiga, JP;
Inventors:
Assignee:
Renesas Electronics Corporation, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R 31/00 (2006.01); G09G 3/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A test signal is supplied to a test switch provided between a D/A converter for selecting and outputting a gray scale voltage of the driving circuit and an amplifier for amplifying and supplying an output voltage at the D/A converter to set a test mode, and an output voltage of the D/A converter is directly measured by a measuring device through the test switch to measure an ON resistance of a gray scale voltage selection circuit of the D/A converter.