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:
Jun. 15, 2010
Filed:
Jul. 02, 2007
Jian-hui LU, Shenzhen, CN;
Tong Zhou, Shenzhen, CN;
He-kang Zhou, Shenzhen, CN;
Innocom Technology (ShenZhen) Co., Ltd., Shenzhen, Guangdong Province, CN;
Innolux Display Corp., Miao-Li County, TW;
Abstract
An exemplary backlight control circuit () includes at least two sampling circuits (), at least two feedback circuits (), and a PWM IC (). Each of the sampling circuits includes a sampling output () and a backlight lamp (). The PWM IC includes a current sense pin (). The at least two feedback circuits correspond to the at least two sampling circuits, respectively. Each of the feedback circuits includes a resistor () and a diode () electrically coupled in parallel. The sampling output is configured to output a first voltage when the backlight lamp is in a normal working state, and output a second voltage when the backlight lamp has an open circuit. One terminal of the diode is electrically coupled to the sampling output of a corresponding one of the sampling circuits, and an opposite terminal of the diode is electrically coupled to the current sense pin.