Patent ID: 8743046

Claim:
A device for driving a liquid crystal display device comprising: a liquid crystal panel having a plurality pixel regions formed thereon; gate and data drivers configured to drive gate and data lines on the liquid crystal panel; a timing controller configured to align and forward external picture data suitable for driving the liquid crystal panel and controlling the gate and data drivers; a picture converting unit configured to set a first and second reference gray scale level at which the color temperature characteristic of the picture data changes significantly, and change a duty ratio of a dimming control signal according to the first and second reference gray scale level; a back light unit configured to direct a light to the liquid crystal panel in response to the dimming control signal, wherein the picture converting unit is further configured to forward the picture data having the set first and second reference gray scale level to the data driver, wherein the first and second reference gray scale levels are set to be gray scale levels at which the color temperature characteristic changes significantly respectively of entire gray scale levels of the picture data; and a dimming control unit configured to generate the dimming control signal the color temperature change can be made minimum by varying the duty ratio depending on whether the gray scale information detected from the timing controller falls on a gray scale range smaller than the first and second reference gray scale levels set, between the first and second reference gray scale levels set, or greater than the first and second reference gray scale levels set.