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1. (WO2017156800) LIQUID CRYSTAL DISPLAY DEVICE AND BACKLIGHT CONTROL METHOD THEREOF

Pub. No.:    WO/2017/156800    International Application No.:    PCT/CN2016/078255
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Sat Apr 02 01:59:59 CEST 2016
IPC: G09G 3/34
G09G 3/36
Applicants: WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD
武汉华星光电技术有限公司
Inventors: ZOU, Gonghua
邹恭华
ZUO, Qingcheng
左清成
Title: LIQUID CRYSTAL DISPLAY DEVICE AND BACKLIGHT CONTROL METHOD THEREOF
Abstract:
Provided are a liquid crystal display device and a backlight control method thereof. The liquid crystal display device comprises: an image data acquisition portion (10); a liquid crystal panel (20); a panel driving unit (30); a backlight module (40); and a backlight driving unit (50). The panel driving unit (30) drives the liquid crystal panel (20) according to image data (S RGB), and generates a backlight driving signal (S PWM) corresponding to the image data (S RGB). The backlight driving unit (50) comprises a pulse width modulation module (51) and a pulse frequency modulation module (52) which are used to respectively modulate the backlight driving signal (S PWM) so as to form driving power sources (VL1, VL2) and to supply the same to the backlight module (40). The liquid crystal display device further comprises a backlight modulation selection unit (60) for calculating an average pixel luminance value A of the image data (S RGB). A reference pixel luminance value A0 is set in the backlight modulation selection unit (60). When A≥A0, the backlight modulation selection unit (60) selects to turn on the pulse width modulation module (51). When A<A0, the backlight modulation selection unit (60) selects to turn on the pulse frequency modulation module (52).