Patent ID: 8816953

Claim:
A liquid crystal display (LCD) device, comprising: a liquid crystal display panel; a plurality of backlight sources configured to provide light to the liquid crystal display panel; a scanning backlight controller configured to generate a pulse width modulation (PWM) signal for controlling a turn-on time and a turn-off time of the light sources and a current control signal for controlling a driving current of the backlight light sources; and a plurality of light source drivers configured to turn on and off the backlight sources in response to the PWM signal and control the driving current of the backlight sources in response to the current control signal, wherein each of the light source drivers includes: a static current source configured to generate a light source driving voltage; an input voltage controller receiving the current control signal that is generated from the scanning backlight controller and varies according to a duty ratio of the PWM signal, configured to control a discharge amount of the light source driving voltage in response to the current control signal such that the driving current of the light source is inversely proportional to the duty ratio of the PWM signal and be electrically coupled between the output terminal of the static current source and a ground voltage source; a switch element configured to supply the light source driving voltage to a non-inverting input terminal of an operational amplifier in response to the PWM signal; and a transistor configured to control the driving current in response to the voltage supplied to a gate terminal, wherein the gate terminal of the transistor is coupled to an output terminal of the operational amplifier, a source terminal thereof is coupled to the backlight sources and a drain terminal thereof is coupled to an inverting input terminal of the operational amplifier.