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. 09, 2005
Filed:
Oct. 29, 2002
Kazuo Kobayashi, Chino, JP;
Kazuo Kobayashi, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
The present invention provides a pulse width modulation signal generation circuit that generates pulse width modulation signals that can suppress the increase in power consumption caused by the increase in grayscale, together with a data line drive circuit, electro-optical device, and electronic instrument that use the same. The pulse width modulation signal generation circuit generates a pulse width modulation signal based on (a+b) bits of grayscale data that have been read from RAM. During that time, the circuit detects a match between a first count value and the high-order the a-bit grayscale data and a match between a second count value, which is one less than that first count value, and the high-order the a-bit grayscale data. In a decoder circuit, one of the match detection results is used to output a pulse width modulation signal, in correspondence with a result of decoding a frame number and the low-order b-bit the grayscale data.