Patent ID: 7586485

Claim:
A controller driver comprising: a display memory for storage of at least one frame of image data, and provided between an image rendering device and a display unit; a memory control circuit for performing control for receiving input image data supplied from said image rendering device, reading out image data from an immediately preceding frame from said display memory and for writing said input image data as write image data in said display memory; a converting circuit for outputting converted image data based on said input image data and said readout image data; an image data control circuit for receiving a moving image/still image discriminating signal supplied from said image rendering device, said moving image/still image discriminating signal indicates that said input image data is of a moving or still image, and for receiving said input image data and said readout image data from the immediately preceding frame, read out from said display memory, to verify whether or not said input image data is coincident with said readout image data; a transfer data control circuit for outputting said input image data or the converted image data if, based on the results of decision in said image data control circuit, said input image data and the converted image data are coincident or are not of equal value, respectively; a plurality of latch circuits each for receiving the image data output from said transfer data control circuit either directly or via preset circuit when said moving image/still image discriminating signal indicates a moving image, or receiving the image data read out from said display memory when said moving image/still image discriminating signal indicates a still image, and latching the image data responsive to an input latch signal; and a plurality of data line drive circuits each for receiving image data output from said latch circuit for driving data lines of said display unit, respectively.