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:
Mar. 13, 2012
Filed:
Oct. 24, 2007
Chihiro Watanabe, Osaka, JP;
Chihiro Watanabe, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A load driving circuit () according to the present invention, for carrying out PWM control to cause currents of respective light emitting diode lines (--N) connected in parallel, each of the light emitting diode lines (--N) including a plurality of light emitting diodes () connected in series, causes timing at which a current of any one of the light emitting diode lines (--N) is turned on or off to be different from timing at which current(s) of at least another one of the light emitting diode lines (--N) is(are) turned on or off. This makes it possible to provide a load driving circuit which (i) does not have a reduction in a degree of freedom in selecting a frequency of a PWM control signal that is used to control loads, (ii) does not prevent a peripheral circuit from following the PWM control circuit, and (iii) prevents generation of sounds.