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1. (WO2018098921) BACKLIGHT CONSTANT CURRENT DRIVER BOARD AND LIQUID CRYSTAL DISPLAY TELEVISION

Pub. No.:    WO/2018/098921    International Application No.:    PCT/CN2017/076071
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Fri Mar 10 00:59:59 CET 2017
IPC: G09G 3/36
Applicants: SHENZHEN CHUANGWEI-RGB ELECTRONIC CO., LTD
深圳创维-RGB电子有限公司
Inventors: LI, Yawei
李亚伟
Title: BACKLIGHT CONSTANT CURRENT DRIVER BOARD AND LIQUID CRYSTAL DISPLAY TELEVISION
Abstract:
A backlight constant current driver board (2) and a liquid crystal display television. The backlight constant current driver board (2) comprises a boost circuit (21), a constant current control circuit (22), a switchover switch circuit (23), and a light strip socket (CN). The backlight constant current driver board (2) is connected to a backlight light strip (4) via the light strip socket (CN). The boost circuit (21) boosts an input voltage (Vin) and then outputs an output voltage (Vout) and transmits via the light strip socket (CN) as power supply to the backlight light strip (4). The switchover switch circuit (23) controls, on the basis of a PWM signal and of the power supply voltage, the connection or disconnection of a loop between a current flowing through the backlight light strip (4) and the ground. The constant current control circuit (22) monitors and keeps constant the magnitude of the current of the backlight light strip (4) in the switchover switch circuit (23). By means of the switchover switch circuit (23), during system standby, the formation of a loop between the current of the backlight light strip (4) and the ground is prevented so that the backlight light strip (4) does not emit light, thus solving the problem of a dim light being emitted by a screen when an existing liquid crystal display television is in standby or when a constant current drive control chip (U) is not working.