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:
May. 14, 2013
Filed:
Jul. 23, 2009
Yuji Tanaka, Osaka, JP;
Takayuki Murai, Osaka, JP;
Yuji Tanaka, Osaka, JP;
Takayuki Murai, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A PLL as a clock generation circuit that generates a PWM clock based on a reference clock, which PWM clock is used for controlling, in a pulse width modulation method, a lamp on time and a lamp off time of a light source illuminating a liquid crystal panel by synchronizing with a video signal that performs display in a set period on the liquid crystal panel, includes a configuration that generates a PWM clock that can maintain a fixed ratio of the lamp on time to the lamp off time within one period even if the set period is changed, by changing a pulse interval of the reference clock in conjunction with the change in the set period.