Patent ID: 7525550

Claim:
A controller driver comprising: a color palette circuit configured to hold color palette data indicating a relation of a color reference number corresponding to a color and RGB data corresponding to the color; a first memory section configured to hold first layer data containing first RGB data specifying a color of each of pixels of a first layer image; a second memory section configured to hold second layer data containing a color reference number specifying a color of each of pixels of a second layer image; a calculating circuit configured to generate synthetic image data of said first layer data and said second layer data; and a driving circuit configured to drive a display panel based on said synthetic image data, wherein said calculating circuit converts each of color reference numbers of said second layer data into second RGB data by using said color palette data, and generates synthetic RGB data from said first RGB data and said second RGB data, said synthetic RGB data specifying a color of each of pixels of said synthetic image data, and wherein said controller driver is installed in a mobile device and power of said controller driver is reduced due to display data reduction.