Patent ID: 8416269

Claim:
A liquid crystal display device comprising: a liquid crystal panel with pixels arranged in a matrix pattern; an input portion receiving pixel data in a frame unit; a driver driving the liquid crystal panel; a frame memory delaying the pixel data from the input portion during one frame period; a data difference calculator calculating a data difference value between the delayed pixel data from the frame memory and the received pixel data from the input portion; a threshold determiner determining a threshold value, corresponding to the received pixel data from the input portion, among a plurality of threshold values which are established along divided gray level ranges of the pixel data; a comparator comparing the determined threshold value from the threshold determiner with the data difference value from the data difference calculator and generating a comparing signal in correspondence with the compared resultant; an over-driver selectively performing an over-driving operation according to the comparing signal; a previous frame data switch to determine whether or not it outputs the delayed frame pixel data from the frame memory to the over-driver according to a logic value of the comparing signal, wherein the threshold determiner checks whether a gray value of the current frame pixel data from an external system is included in any one among the plural level ranges.