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:
Apr. 15, 2008
Filed:
Nov. 18, 2003
Masami Makuuchi, Yokohama, JP;
Kengo Imagawa, Fujisawa, JP;
Norio Chujo, Tokyo, JP;
Ritsuro Orihashi, Tokyo, JP;
Yoshitomo Arai, Ome, JP;
Atsushi Obuchi, Higashiyamato, JP;
Masami Makuuchi, Yokohama, JP;
Kengo Imagawa, Fujisawa, JP;
Norio Chujo, Tokyo, JP;
Ritsuro Orihashi, Tokyo, JP;
Yoshitomo Arai, Ome, JP;
Atsushi Obuchi, Higashiyamato, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A semiconductor device having a liquid crystal driving circuit is disclosed. The driving circuit includes a digital functional unit and an analog functional unit. The digital functional unit is comprised of a display controller and a display data storage RAM, while the analog functional unit is made up of a gradation voltage generating circuit and a gradation voltage selecting circuit. The digital and analog function units are functionally divided from each other and testing of the digital function and testing of the analog function unit are performed in an overlapping manner independently from each other.