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. 10, 2010
Filed:
Mar. 14, 2007
Daisuke Ueda, Osaka, JP;
Masaaki Yuri, Osaka, JP;
Katsumi Sugiura, Kyoto, JP;
Kenichi Matsuda, Kyoto, JP;
Daisuke Ueda, Osaka, JP;
Masaaki Yuri, Osaka, JP;
Katsumi Sugiura, Kyoto, JP;
Kenichi Matsuda, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A semiconductor light source includes a light-emitting devicehaving a plurality of semiconductor layers made of nitride semiconductors, and a drive circuitfor driving the light-emitting device. The drive circuitperforms forward drive operation, in which a forward current is supplied to the light-emitting device to make the light-emitting deviceemit light, and reverse drive operation, in which a reverse bias is applied to the light-emitting device. The magnitude of the reverse bias is limited by the value of a reverse current flowing through the light-emitting device.