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:
Sep. 06, 2005
Filed:
Jun. 27, 2002
Ryo Ishii, Matsumoto, JP;
Suguru Yamazaki, Suwa, JP;
Ryo Ishii, Matsumoto, JP;
Suguru Yamazaki, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The invention simplifies the configuration of a comparators circuit used in an electrooptic device or the like, in which gradation data is stored for each pixel, to realize lower power consumption, higher definition and multiple gradation. Transistors in which gradation data Dto Dare respectively supplied to the gate terminals, and transistors in which gradation signals Pto Presulting from counting are respectively supplied to the gate terminals are connected to form a comparator circuit. When the gradation signals Pto Pare less than the results of reversal of the gradation data Dto D, the comparator circuit is placed into a nonconductive state, while when the gradation signals Pto Pare equal to the results of reversal of the gradation data Dto D, the comparator circuit is placed into a conductive state. As a result, a pulse signal PW can be produced according to the gradation data Dto Dto realize a gradation display in a sub-field driving system. Also, the number of the transistors constituting the comparator circuit can be significantly decreased, as compared with a related art technique.