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:
Jun. 19, 2012
Filed:
Sep. 10, 2009
Tomoshi Yoshida, Hyogo-ken, JP;
Nobuyuki Ohtaka, Kadoma, JP;
Tomoshi Yoshida, Hyogo-ken, JP;
Nobuyuki Ohtaka, Kadoma, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Sanyo Semiconductor Co., Ltd., Gunma, JP;
Abstract
A light-emitting element driving circuit () comprises a luminosity determining unit () which determines luminosity, outputs a luminosity determination result, and outputs brightness change information, a brightness setting unit () which outputs brightness setting information and outputs brightness change information, a light-emitting element driving unit () which drives a light-emitting element with a current of a current value corresponding to the brightness setting information, a detecting and comparing unit () which compares a terminal voltage of the light-emitting element and a predetermined voltage, a voltage boost determining unit () which determines whether or not a terminal voltage of the light-emitting element is to be boosted based on at least one of the luminosity change information and the brightness change information, and a voltage boosting circuit section () which boosts the terminal voltage of the light-emitting element when it is determined that the voltage is to be boosted and does not boost the terminal voltage of the light-emitting element when it is determined that the voltage is not to be boosted.