Patent ID: 8896509

Claim:
A liquid crystal display device, comprising: a liquid crystal panel including a pixel having red, green, blue and white sub-pixels; an RGBW signal generating part that performs a color correction on RGB input data corresponding to the pixel and converting the RGB input data into RGBW data; and an output controlling part that outputs RGBW output data by performing a gamma conversion on the RGBW data, wherein the RGBW signal generating part comprises: a de-gamma part that performs a de-gamma conversion on the RGB input data to generate first RGB conversion data; a color correcting part that performs the color correction on the first RGB conversion data to generate second RGB conversion data, wherein the second RGB conversion data are obtained from the first RGB conversion data divided by red, green and blue color correction coefficients, respectively, and wherein the red, green and blue color correction coefficients are determined to be different from each other according to optical properties of the liquid crystal panel and displayed images; a first RGBW generating part that generates first RGBW data using the second RGB conversion data; a gain generating part that generates a gain for a present display frame, independent of a backlight, wherein the gain is generated by dividing a maximum grey level by a maximum of the first RGBW data of a previous display frame; and a second RGBW generating part that generates second RGBW data by multiplying the first RGBW data and the gain.