Patent ID: 7362295

Claim:
An apparatus for driving a liquid crystal display including a plurality of pixels arranged in a matrix, the apparatus comprising: a gray voltage generator generating a plurality of gray voltages; a data driver selecting data voltages from the gray voltages corresponding to image data and applying the data voltages to the pixels; and a signal controller supplying the image data for the data driver, determining image types of images represented by the image data in two adjacent frames during an interval period based on the difference in the image data between two adjacent frames during a filtering period, and suspending image data modification during a predetermined period if the image types of images during the interval period are determined to be still images, the signal controller comparing a present image data with a previous image data for each pixel and generates a first comparison signal for each pixel row, the signal controller counting the number of the pulses contained in each of the first comparison signals and generates a second comparison signal for each frame, the signal controller counting the number of the pulses contained in each of the second comparison signals and generates a third comparison signal for the filtering period, the signal controller determining that the image types during the interval period following the filtering period are motion images if the respective number of the pulses contained in the third comparison signals for the interval period is more than a third predetermined number and, that if not, the image data for the filtering period are still images, and the signal controller outputting an image type selection signal having a first state or a second state based on the determination.