Apparatus and method for driving liquid crystal display device

1. An apparatus for driving a liquid crystal display device, the apparatus comprising:

a liquid crystal display panel having at least two division areas;

a plurality of light generators including at least one light emitting diode (LED) and irradiating light corresponding to each division area of the liquid crystal display panel;

a timing controller supplied with a peak value of gray level of the each division area to generate each control signal corresponding to the peak value of the gray level of the each division area; and

a driver to control a brightness of the light emitted by the LED, in accordance with the each control signal,

wherein the driver adjusts a duty ratio of a signal being supplied to the LED in accordance with a reference brightness of the liquid crystal display panel during a scanning period before a picture implementing period of the liquid crystal display panel, and changes an amplitude of the signal to correspond to the reference brightness, or

adjusts the amplitude of the signal being supplied to the LED in accordance with the reference brightness of the liquid crystal display panel, and changes the duty ratio of the signal to correspond to the reference brightness.

2. The apparatus according to claim 1 , wherein the at least one LED includes:

at least one white LED; or

red, green, and blue LEDs.

3. The apparatus according to claim 2 , wherein the red, green, and blue LEDs include any one of the following: red-green-blue LEDs, red-green-green-blue LEDs, or red-green-blue-blue LEDs.

4. The apparatus according to claim 2 , wherein the red, green and blue LEDs are arranged vertically and horizontally in certain order.

5. The apparatus according to claim 1 , wherein the driver includes:

a pulse width modulation (PWM) controller arranged between the timing controller and the LED; and

a switch arranged between the PWM controller and the LED to control on-off of the LED.

6. The apparatus according to claim 5 , wherein the PWM controller is connected to a light emitting diode group formed by at least one LED, to adjust a strength of current generated by the timing controller.

7. A liquid crystal display device comprising:

a liquid crystal display panel;

a backlight unit including a plurality of light emitting diodes (LEDs) irradiating light corresponding to the liquid crystal display panel;

a timing controller supplied with a peak value of gray level of each division area to generate each control signal corresponding to the peak value of the gray level of the each division urea; and

a driver to selectively drive the LEDs and selectively control a brightness of light generated by the LEDs in accordance with the each control signal,

wherein the driver adjusts a duty ratio of a signal being supplied to the LED in accordance with a reference brightness of the liquid crystal display panel during a scanning period before a picture implementing period of the liquid crystal display panel, and changes an amplitude of the signal to correspond to the reference brightness, or

adjusts the amplitude of the signal being supplied to the LED in accordance with the reference brightness of the liquid crystal display panel, and changes the duty ratio of the signal to correspond to the reference brightness.

8. The device according to claim 7 , wherein the LEDs are one of the following:

white LEDs; or

a combination of red, green, and blue LEDs.

9. The device according to claim 7 , wherein the LEDs are arranged in one of the following manners:

a sequence of red LED, green LED, green LED, and blue LED; or

a sequence of red LED, green LED, blue LED, and blue LED.

10. The device according to claim 7 , wherein the driver adjusts a duty ratio and/or an amplitude of a basic pulse signal to control the brightness of the light generated by one or more of the LEDs.

11. The device according to claim 7 , wherein the plurality of LEDs are arranged in a matrix configuration.

12. A method for driving a liquid crystal display device including a liquid crystal display panel and light generators, the method comprising:

dividing the liquid crystal display panel into at least two division areas;

calculating a peak value of gray level of each division area;

generating a each control signal corresponding to each peak value; and

controlling, in accordance with each control signal, the plurality of light generators including at least one light emitting diode (LED) to generate and irradiate light corresponding to the each division area,

wherein the controlling step includes adjusting a duty ratio of a signal being supplied to the LED in accordance with a reference brightness of the liquid crystal display panel during a scanning period before a picture implementing period of the liquid crystal display panel, and changing an amplitude of the signal to correspond to the reference brightness, or

adjusting the amplitude of the signal being supplied to the LED in accordance with the reference brightness of the liquid crystal display panel, and changing the duty ratio of the signal to correspond to the reference brightness.

13. The method according to claim 12 , wherein in the controlling step, the at least one LED includes:

at least one white LED; or

red, green, and blue LEDs arranged in certain order.

14. The method according to claim 13 , wherein the red, green, and blue LEDs include any one of the following: red-green-blue LEDs, red-green-green-blue LEDs, or red-green-blue-blue LEDs.

15. The method according to claim 12 , wherein the controlling step further includes:

generating a pulse signal according to the control signal; and

selectively controlling the LED using the pulse signal.

16. The method according to claim 12 , wherein the at least LED includes a plurality of LEDs arranged in a matrix configuration, and the controlling step includes:

dividing the plurality of LEDs into a plurality of LED groups; and

selectively driving each of the LED groups.