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:
Sep. 01, 2020
Filed:
Apr. 26, 2019
Applicant:
Nichia Corporation, Anan-shi, Tokushima, JP;
Inventor:
Hideki Kondo, Yokohama, JP;
Assignee:
NICHIA CORPORATION, Anan-Shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 3/00 (2006.01); H01S 5/068 (2006.01); H01S 5/026 (2006.01); H01S 5/062 (2006.01); H01S 5/022 (2006.01);
U.S. Cl.
CPC ...
H01S 5/06808 (2013.01); H01S 5/0261 (2013.01); H01S 5/068 (2013.01); H01S 5/06223 (2013.01); H01S 5/06804 (2013.01); H01S 5/06825 (2013.01); H01S 5/02248 (2013.01);
Abstract
A driver circuit includes: a variable power supply configured to apply a power supply voltage to a light emitting device and to vary a voltage value of the power supply voltage; a current-control switching device electrically connected to the light emitting device and configured to control a current flowing in the light emitting device; a detection part configured to detect a current value and a voltage value related to the current flowing in the light emitting device; and a control part configured to determine a minimum voltage of the power supply voltage based on a detection result of the detection part.