Patent ID: 8149201

Claim:
An liquid crystal display (LCD) driving apparatus, comprising: a memory; a memory controller, coupled to the memory; an overdriving circuit, coupled to the memory controller, for generating overdriving frame data; and a difference value circuit, coupled to the memory controller and the overdriving circuit, the difference value circuit partitioning each of a plurality of frames into a plurality of pixel blocks, receiving first frame data and second frame data, obtaining a plurality of first gray level differences corresponding to the first frame data and a plurality of second gray level differences corresponding to the second frame data according to a plurality of pixel gray level values corresponding to each of the pixel blocks, and comparing the first gray level differences with the second gray level differences to determine whether to enable the memory controller and the overdriving circuit; wherein the first gray level differences correspond to the pixel blocks, the first gray level differences are calculated according to equation: SOD(R, C)=m=RR+Q−1n=CC+Y−1P(m, n)−P(m, n−1), ##EQU00005## where SOD(R, C) represents the first gray level differences, (R, C) represents the upper-left pixel coordinates of the pixel blocks, (m, n) represents the pixel coordinates, P(m, n) represents the pixel gray level values of the first frame data, Q represents the pixel number corresponding to the height of each of the pixel blocks, Y represents the pixel number corresponding to the width of each of the pixel blocks, P(m, 0)=0 when n=1, and R, C, m, Q, and Y are positive integers.