Patent ID: 7248242

Claim:
A driving circuit for driving a liquid crystal display, the liquid crystal display comprising: a liquid crystal panel, the liquid crystal panel comprising: a plurality of scan lines; a plurality of data lines; and a plurality of pixels, each pixel is connected to a corresponding scan line and a corresponding data line, and each pixel has a switching device connected to the corresponding scan line and the corresponding data line; the driving circuit comprising: a scan line driving circuit for continuously providing scan voltages to the scan lines; an image data input terminal for receiving an M-bit image data; a bit processor for extracting N most significant bits (MSB) from the M-bit image data to form an N-bit image data, N is smaller than M; an image memory for storing the N-bit image data and delaying the N-bit image data by a frame period; a comparison circuit for comparing P MSB of a current M-bit image data with the N-bit delayed image data to determine a result value; a lookup table (LUT) for outputting an M-bit over-driving image value in accordance with the P MSB and the N-bit delayed image data; a multiplexer for outputting the M-bit over-driving image value when the result value indicates that the P MSB of the current M-bit image data and the N-bit delayed image data are not equal, and for outputting the M-bit image data when the result value indicates that the P MSB of the current M-bit image data and the N-bit delayed image data are equal; and a data line driving circuit for forming a data voltage in accordance with output of the multiplexer, and providing the data voltage to the corresponding data line.