LED backlight driving circuit and method for driving the LED backlight driving circuit

1. A light emitting diode (LED) backlight driving circuit, comprising:

a power assembly;

a control assembly; and

at least two LED lamps;

wherein the control assembly generates a power control signal according to a working state of the LED lamp, and the power assembly outputs power corresponding to an on-LED lamp according to the power control signal, wherein the power assembly comprises a boost unit and a power chip, the power chip controls an output power of the boost unit; the control assembly comprises an oscillating circuit and a control unit, the control unit generates a resistance control signal according to the working state of the LED lamp, and the oscillating circuit generates the power control signal according to the resistance control signal and sends the power control signal to the power chip; the power chip controls the boost unit to output the power corresponding to the on-LED lamp according to the power control signal, wherein the oscillating circuit comprises a variable resistance unit, the variable resistance unit comprises a resistor and a controllable switch connected with each other in parallel; the power chip comprises a frequency control pin; the variable resistance unit adjusts a resistance according to the resistance control signal through the controllable switch; the oscillating circuit generates the power control signal according to a changed resistance of the variable resistance unit and sends the power control signal to the frequency control pin; and the power chip controls the boost unit to output the power corresponding to the on-LED lamp according to the power control signal.

2. The LED backlight driving circuit of claim 1 , wherein the control unit further comprises an integral circuit and a control chip, the controllable switch is a semiconductor controllable switch; the control chip transforms the working state of the LED lamp into an analog signal, and the integral circuit processes the analog signal to generate a resistance control signal; and the resistance control signal is sent to a control end of the semiconductor controllable switch.

3. The LED backlight driving circuit of claim 2 , wherein the control unit further comprises a memory chip storing the working timing of the LED lamps; the control chip obtains the working timing of the LED lamps from the memory chip, and transforms the working timing of the LED lamps into the analog signal; the integral circuit generates the resistance control signal according to the analog signal, and the resistance control signal controls the semiconductor controllable switch.

4. The LED backlight driving circuit of claim 2 , wherein the control unit further comprises a timing control chip transforming the working state of the LED lamp into a display driving timing; the control chip obtains the display driving timing of the LED lamps from the timing control chip, and transforms the display driving timing of the LED lamps into the analog signal; the integral circuit generates the resistance control signal according to the analog signal, and the resistance control signal controls the semiconductor controllable switch.

5. A method for driving a light emitting diode (LED) backlight driving circuit, comprising:

reading a working state of an LED lamp using a control assembly;

outputting a power control signal corresponding to the working state of the LED lamp by the control assembly; and

outputting power corresponding to an on-LED lamp according to the power control signal by a power assembly;

prestoring a working timing of each of the LED lamps by the control assembly;

transforming the working state of the LED lamp into an analog signal by a digital to analog converter, controlling a variable resistance unit to adjust a resistance by an integral circuit, and generating the power control signal corresponding to the working state of the LED lamp according to the resistance of the variable resistance unit by an oscillating circuit; and

controlling a boost unit to output the power corresponding to the on-LED lamp according to the power control signal through the power chip of the power assembly.

6. The method for driving the LED backlight driving circuit of claim 5 , wherein the step comprises:

reading the working state of the LED lamp from the timing control chip by the control assembly;

transforming the working timing of the LED lamp into an analog signal by a digital to analog converter, controlling a variable resistance unit to adjust a resistance by an integral circuit, and generating the power control signal corresponding to the working state of the LED lamp according to the resistance of the variable resistance unit by an oscillating circuit; and

controlling a boost unit to output the power corresponding to the on-LED lamp according to the power control signal by the power chip of the power assembly.