Patent ID: 9202437
Filing Date: 2015-12-01
Classification: G02F,G09G

Abstract:
1. A liquid crystal display (LCD) system comprising: an LCD device including a video processing module and a light emitting diode (LED) backlight module; and an alternating current (AC) adapter including a backlight driving module coupled to said LED backlight module of said LCD device, generating a backlight driving signal, and outputting the backlight driving signal to drive said LED backlight module of said LCD device, and an AC-to-DC (direct current) converting module coupled to said video processing module of said LCD device and said backlight driving module, adapted to convert an AC line voltage into first and second DC voltages, and outputting the first and second DC voltages to power said video processing module of said LCD device and said backlight driving module, respectively, the video processing module of the LCD device generating a backlight-ON control signal, wherein said backlight driving module includes: a decoding circuit generating a variable maximum backlight current control signal; and a driving circuit coupled to said decoding circuit for receiving the maximum backlight current control signal therefrom, and adapted to receive the backlight-ON control signal from the video processing module of the LCD device, said driving circuit generating the backlight driving signal based on the maximum backlight current control signal and the backlight-ON control signal, such that the backlight-ON control signal determines whether or not a backlight current output is provided to the LED backlight module of the LCD device, and such that a maximum magnitude of the backlight current output is associated with the maximum backlight current control signal.