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:
Dec. 20, 2011
Filed:
Apr. 28, 2010
Go Takata, Hyogo, JP;
Hideyuki Nakanishi, Okayama, JP;
Toshiki Onishi, Osaka, JP;
Akihiro Yamamura, Osaka, JP;
Takahiro Kobayashi, Okayama, JP;
Go Takata, Hyogo, JP;
Hideyuki Nakanishi, Okayama, JP;
Toshiki Onishi, Osaka, JP;
Akihiro Yamamura, Osaka, JP;
Takahiro Kobayashi, Okayama, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A light emitting element drive apparatus that drives light emitting elements reduces power loss caused by variability between forward voltage drops of the light emitting elements. A plurality of voltage applying sections (and; andand) generate application voltages based on a detection voltage determined based on a maximum forward voltage drop among the forward voltage drops of the light emitting element arrays (to), and apply the generated application voltages to the light emitting elements (to). Switching sections (and) switch between a plurality of voltage applying sections (and; andand) to which the light emitting element arrays (to) individually connect. Controlling sections (to) control the switching sections (and) to switch connection to minimize the difference between forward voltage drops of light emitting element arrays (to).