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:
Mar. 25, 2014
Filed:
Jul. 09, 2012
Xiang Yang, Shenzhen, CN;
Liangchan Liao, Shenzhen, CN;
Poshen Lin, Shenzhen, CN;
Shenzhen China Star Optoelectronics Technology Co., Ltd., Shenzhen, CN;
Abstract
A light emitting diode (LED) backlight driving circuit includes LED lightbar(s) and a control module; the control module includes a dimming controllable switch. The LED lightbars are connected with the dimming controllable switch in series. Two ends of the dimming controllable switch are connected with a varistor in parallel. Because two ends of the dimming controllable switch are connected with a varistor in parallel, when the dimming controllable switch is switched off, a current of the branch circuit is suddenly reduced, the voltage withstood by the LED lightbars is greatly reduced, and the voltage on two ends of the dimming controllable switch is increased. Then, under action of high voltage, resistance of the varistors connected in parallel is reduced, and the current of a new branch circuit formed by the LED lightbars and the varistor is also increased. Thus, the voltage withstood by the LED lightbars is increased again and the voltage on two ends of the dimming controllable switch is reduced.