a liquid crystal display device comprises a liquid crystal panel assembly having pixels and thin film transistors , a sensor sensing temperature , a image signal modifying portion receiving image signals and the temperature , calculating a plurality of reference data for modification with respect to the temperature using coefficient of quadratic equation , and generating modified images signals according to the reference data for modification for the image signals for previous and current frame ; and a data driving portion converting the modified image signals into data voltages and supplying the data voltages to the liquid crystal panel assembly . according to this configuration , the liquid crystal display device may reduce the size of the memory by calculating modified image signals with respect to the temperature using pqi .