Patent ID: 8285037

Claim:
A display driver with a frame memory for temporarily storing image data representing a color image, and a data bus for feeding image data to said display driver, characterized in that said display driver comprises: means for performing a decision process, said decision process being based on an analysis of the color characteristics of a pixel cluster of said image data, the means for performing a decision process allowing the display driver to decide whether a first compression format or a second compression format is to be applied for compression of said pixel cluster, first compression means performing a compression of said pixel cluster into said first compression format, second compression means performing a compression of said pixel cluster into said second format, wherein said first compression format or said second compression format is selected based upon said results of said decision process, the pixel clusters are stored after compression in an available storage area of said frame memory, and a compression-format code is stored indicating which compression format was used for which pixel cluster.