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:
May. 13, 2008
Filed:
Nov. 27, 2006
Tong Zhou, Shenzhen, CN;
Huai-zhu Yan, Shenzhen, CN;
Kun Le, Shenzhen, CN;
Innocom Technology (Shenzhen) Co., Ltd., Shenzhen, Guangdong Province, CN;
Innolux Display Corp., Miao-Li County, TW;
Abstract
An open protection circuit () for a backlight module includes a PWM () with a control port () to disable the PWM. A switch () has a gate and a source connected to the control port. A plurality of first input circuits () includes first diodes (), each of which has a first positive terminal connected to the gate and a negative terminal connected to ground. A plurality of second input circuits () include input resistors () connected to the control port. A plurality of detecting circuits () are connected to the fluorescent lamps () and the first and second input circuits respectively. Each detecting circuit includes a sampling resistor () connected to one of the negative terminals of the first diodes, thereby the control port of the PWM is pulled low when either one of the fluorescent lamps are open-circuit.