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:
Jul. 05, 2011
Filed:
Oct. 16, 2007
He-kang Zhou, Shenzhen, CN;
Jian-hui LU, Shenzhen, CN;
Tong Zhou, Shenzhen, CN;
Innocom Technology (Shenzhen) Co., Ltd., Shenzhen, Guangdong Province, CN;
Chemei Innolux Corporation, Miao-Li County, TW;
Abstract
An exemplary backlight control circuit () includes a DC power supply (VDD), a load circuit (), an input circuit (), and a PWM IC (). The load circuit includes two light sources () and a rectifier and filter circuit (). The input circuit includes a diode () and a capacitor (). The PWM IC includes a current sampling pin () and an overvoltage protection pin (). A low voltage terminal of a first one of the two light sources is connected to the current sampling pin via the rectifier and filter circuit, and a low voltage terminal of a second one of the two light sources is connected to a cathode of the diode. An anode of the diode is connected to the DC power supply and grounded via the capacitor. The overvoltage protection pin is connected to the DC power supply.