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:
Feb. 21, 2012
Filed:
Aug. 18, 2009
Chia-lin Liu, Taichung County, TW;
Ling LI, Hualien County, TW;
Chia-ling Peng, Taoyuan County, TW;
Kuo-chung Lo, Tainan, TW;
Chi-neng MO, Taoyuan County, TW;
Chia-Lin Liu, Taichung County, TW;
Ling Li, Hualien County, TW;
Chia-Ling Peng, Taoyuan County, TW;
Kuo-Chung Lo, Tainan, TW;
Chi-Neng Mo, Taoyuan County, TW;
Chunghwa Picture Tubes, Ltd., Taoyuan, TW;
Abstract
A light emitting diode (LED) driving circuit is provided. The LED driving circuit includes a voltage adjusting unit, a switch unit, and a control unit. The control unit is coupled to the voltage adjusting unit and the switch unit. The voltage adjusting unit outputs a driving voltage to a first end of each of a plurality of load units. The switch unit is coupled to a second end of each of the load units. When one LED string in the load units is coupled to a current source, the voltage adjusting unit adjusts the voltage level of the driving voltage so that the voltage level of the driving voltage of the driving voltage corresponds to the driven LED string. Thereby, a driving problem caused by the variation in electrical characteristics of the LEDs is alleviated.