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:
Oct. 14, 2014
Filed:
Jun. 27, 2013
Applicant:
Everlight Electronics Co., Ltd., New Taipei, TW;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 33/00 (2006.01); H05B 33/08 (2006.01); G09G 3/34 (2006.01); H01L 25/075 (2006.01); H01L 33/50 (2010.01);
U.S. Cl.
CPC ...
H05B 33/0857 (2013.01); G09G 2320/06 (2013.01); G09G 3/3406 (2013.01); H01L 33/50 (2013.01); H01L 25/0753 (2013.01);
Abstract
A method of operating a color-temperature-tunable device is described. The method drives a first light emitting diode (LED) chip with a first driving current from a first power source. The first LED chip is configured to emit a first light having a first peak wavelength. The method also drives a second LED chip with a second driving current from a second power source. The second LED chip is configured to emit a second light having a second peak wavelength. The method further maintains a total driving current, which includes the first driving current and the second driving current, approximately constant. The second peak wavelength is different from the first peak wavelength.