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1. (WO2014201713) LED BACKLIGHT DRIVE CIRCUIT AND BACKLIGHT DRIVE METHOD

Pub. No.:    WO/2014/201713    International Application No.:    PCT/CN2013/078189
Publication Date: Thu Dec 25 00:59:59 CET 2014 International Filing Date: Fri Jun 28 01:59:59 CEST 2013
IPC: H05B 37/02
G09G 3/34
Applicants: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
深圳市华星光电技术有限公司
Inventors: ZHANG, Xianming
张先明
YANG, Xiang
杨翔
Title: LED BACKLIGHT DRIVE CIRCUIT AND BACKLIGHT DRIVE METHOD
Abstract:
An LED backlight drive circuit and a backlight drive method. The LED backlight drive circuit comprises a plurality of LED light bars (20), a power supply module (10) for driving the LED light bars (20), and comparison modules (21) corresponding to the LED light bars (20) one to one. The first input end of the comparison module (21) is coupled to the negative terminal of the LED light bar (20), and the second input end thereof is coupled with a first reference voltage (Vref1). Each LED light bar (20) is connected to a switch module (22) in series, and the output end of the comparison module (21) is coupled with a counting module (30). The output end of the counting module (30) is coupled with drive modules (60) which correspond to the switch modules (22) one to one and is used for controlling the ON or OFF switching of the switch modules (22). The counting module (30) divides the LED light bars (20) into two groups according to the logic states output by the comparison modules (21), and controls the drive modules (60) to switch off a group of which the number of the LED light bars (20) is smaller.