Patent ID: 8174485

Claim:
A liquid crystal display device comprising: a liquid crystal display panel; a gate driving unit driving gate lines of the liquid crystal display panel; a data driving unit for driving data lines of the liquid crystal display panel; a timing controller for controlling the gate and data driving units and calculating an average brightness value of pixel data of at least one frame to be supplied to the liquid crystal display panel and storing the average brightness value to a memory unit; a light source unit including red, green, blue LEDs; and a light source driving unit including an LED brightness controlling unit for generating a brightness control signal having a duty ratio according to the average brightness value of the pixel data adjusted taking transmissivity at an angle of view in a white or black driving mode of the liquid crystal display panel, and driving the light source unit according to the brightness control signal, wherein the LED brightness controlling unit controls the duty ratio for making a light quantity of at least one of red, blue, and green colors which vary with the angle of view in the black driving mode greater or smaller than the brightness average value, and wherein the LED brightness controlling unit decreases the duty ratio of a red brightness control signal for making a light quantity of the red LED smaller than a red brightness average value in the black driving mode.