Patent ID: 7123224

Claim:
A liquid crystal display comprising: a liquid crystal panel assembly including a plurality of pixels; a gray signal modifier classifying a plurality of pairs of current gray signals and previous gray signals into at least two groups based on characteristics of a difference between the current gray signals and the previous gray signals and modifying the current gray signals based on a corresponding group of the at least two groups to generate a plurality of modified gray signals; wherein the gray signal modifier comprises: a frame memory storing the current gray signals and outputting the previous gray signals stored therein; a case selector classifying the pairs of the current gray signals and the previous gray signals into the at least two groups based on the characteristics of the difference between the current gray signals and the previous gray signals from the frame memory and generating corresponding case signals; a lookup table outputting variables corresponding to the MSBs of the current gray signals and the MSBs of the previous gray signals from the frame memory; and a calculator calculating the variables from the lookup table, the LSBs of the current gray signals and the LSBs of the previous gray signals from the frame memory in response to the case signals from the case selector and generating the modified gray signals; and a data driver converting the modified gray signals into corresponding image signals and providing the corresponding image signals to the pixels; wherein the current gray signals and the previous gray signals have most significant bits (“MSBs”) and least significant bits (“LSBs”); and wherein the modified gray signals for the pairs where the LSBs of the current gray signals and the LSBs of the previous gray signals are zero are predetermined, and the variables are determined in accordance with the predetermined modified gray signals.