Patent ID: 8111933

Claim:
A display panel driver comprising: a compression circuit configured to, when receiving image data of a set of pixels of a target block, generate compressed image data corresponding to said target block by compressing said image data, the number of said set of pixels being equal to or more than four; an image memory configured to store said compressed image data; a decompression circuit configured to generate decompressed image data by decompressing said compressed image data reading from said image memory; and a drive circuit configured to drive a display panel in response to said decompressed image data, wherein said compression circuit selects one of a plurality of compression methods based on a correlation between said image data of said set of pixels of said target block, and generates said compressed image data by using said selected compression method, wherein said plurality of compression methods includes: a first compression method which calculates a first representative value corresponding to image data of said set of pixels and incorporates said first representative value into said compressed image data, a second compression method which calculates a second representative value corresponding to image data of n pixels of said set of pixels and incorporates said second representative value into said compressed image data, said n being an integer equal to or more than two and less than the number of said set of pixels, and a third compression method which calculates a first bit-reduced data by performing a color-reduction process independently on image data of each of said set of pixels and incorporates said first bit-reduced data into said compressed image data.