Liquid crystal display device and method for driving the same

A method for driving a liquid crystal display device including a display panel for displaying an image, a backlight unit comprising a plurality red light sources, a plurality of green light sources, and a plurality of blue light sources, a backlight driver for controlling a duty rate of a first drive signal to drive the red light sources, a duty rate of a second drive signal to drive the green light sources, and a duty rate of a third drive signal to drive the blue light sources, in accordance with a control signal including color coordinate information and luminance information, and a light sensor for sensing light beams from the light sources, generating light sensing signals based on the sensed light beams, and supplying the light sensing signals to the backlight driver and to a luminance corrector, comprising:

• checking the first to third drive signals from the backlight driver, and first to third sensing signals from the light sensor, thereby identifying a drive signal having a duty rate of 100%, and a luminance of light sources driven by the drive signal having the duty rate of 100%;
• selecting a luminance correction value from a plurality of previously-stored luminance correction values in accordance with the results of the identification and the control signal supplied from an outside of the liquid crystal display device, and outputting the selected luminance correction value;
• and
• varying the luminance information of the control signal, using the selected luminance correction value, and supplying the resultant control signal, which includes the varied luminance information, to the backlight driver;
• wherein, in response to the control signal including the color coordinate information and the varied luminance information, the backlight driver sets the drive signal having the duty rate of 100% as a reference signal, and maintains the duty rate of the reference signal at 100%, while again setting the duty rates of the remaining drive signals, to meet the color coordinate information of the control signal.