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:
Jan. 16, 2018
Filed:
Mar. 31, 2015
Applicant:
Sharp Kabushiki Kaisha, Sakai-shi, Osaka, JP;
Inventor:
Atsushi Yamashita, Sakai, JP;
Assignee:
SHARP KABUSHIKI KAISHA, Sakai, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 33/08 (2006.01); C09K 11/77 (2006.01); C09K 11/08 (2006.01); H01L 33/50 (2010.01); H01L 25/075 (2006.01); G02F 1/1335 (2006.01); F21V 8/00 (2006.01);
U.S. Cl.
CPC ...
H05B 33/0851 (2013.01); C09K 11/0883 (2013.01); C09K 11/7734 (2013.01); G02B 6/0055 (2013.01); G02F 1/133621 (2013.01); H01L 25/0753 (2013.01); H01L 33/502 (2013.01); H01L 33/507 (2013.01); H05B 33/0869 (2013.01); G02F 2001/133614 (2013.01);
Abstract
An LED drive circuit () includes a controller () which controls a duty ratio of a PWM signal and driving current for driving a blue LED chip (B) with a blue LED driver (B) based on blue light, green light, and red light which are received by a photo sensor ().