Patent ID: 7019728

Claim:
A liquid crystal display (LCD) device, comprising: a control unit receiving an RGB picture signal and a first timing signal from the external and outputting the RGB picture signal, a second timing signal for displaying the RGB picture signal on a screen, a backlight control signal and a bias voltage; a first direct current power conversion unit responsive to an ON state of the backlight control signal for applying a backlight driving voltage; a backlight unit outputting light according to the application of the backlight driving voltage; a gate driver outputting a scan signal; a source driver outputting a picture signal; and an LCD panel including: a plurality of gate lines transmitting the scan signal; a plurality of source lines intersecting the plurality of gate lines and transmitting the image signal; a plurality of switching elements connected to the gate lines and the source lines, respectively; a plurality of picture electrodes connected to the switching elements and arranged in a matrix type; and a common electrode line receiving the bias voltage at an initial operation of the LCD, wherein the control unit comprises: a timing controller outputting a first switching signal and the backlight control signal of OFF state at the initial operation and outputting a second switching signal and the backlight control signal of ON state after a predetermined period elapses; a second direct current power conversion unit outputting the bias voltage; and a switching unit outputting the bias voltage to the common electrode line when the first switching signal is applied by the timing controller and the common electrode voltage to the common electrode line when the second switching signal is applied by the timing controller.