Patent ID: 8084961

Claim:
A backlight module control system, comprising: at least one backlight module; a driving circuit, for determining a driving signal to drive the backlight module; at least one first switch, having a first node, a second node and a control node and coupled between the driving circuit and the backlight module, for being selectively turned on or off according to the driving signal inputted into the control node of the first switch; and a power supply module, coupled to the backlight module, for providing an operating voltage required by the backlight module control system; wherein the driving circuit comprises: a current source, for providing a current to the backlight module; and at least one second switch, coupled between the current source and the first switch, for being selectively turned on or off according to a pulse width modulation (PWM) signal to determine the driving signal; wherein a first terminal of the current source is connected to the second switch and a second terminal of the current source is connected to a ground; wherein the first node of the first switch is coupled to the backlight module, the second node of the first switch is connected to the second switch, and the second switch is coupled to the backlight module only when the first switch is in a conducting state.