Patent ID: 8497843

Claim:
A controller driver that controls a display panel and a touch panel disposed on the display panel, the controller driver comprising: a display memory that stores image data to be displayed on the display panel; a touch panel control circuit that detects a touch panel signal from the touch panel; a cursor memory that stores cursor image data; a composition circuit that combines the cursor image data stored in the cursor memory with the image data stored in the display memory based on the touch panel signal, to generate composite image data; a click determination circuit that determines a click operation based on the touch panel signal; a click memory that stores click image data; and a conversion circuit that converts at least one of the cursor image data and the click image data, wherein, when the click determination circuit determines that no click operation is carried out, the conversion circuit generates data after a conversion processing is subjected to the cursor image data stored in the cursor memory, wherein, when the click determination circuit determines that the click operation is carried out, the conversion circuit generates data after another conversion processing, different from the conversion processing performed when no click operation is carried out, which is subjected to the click image data stored in the click memory, and wherein the composition circuit generates the composite image data by combining the data obtained after the conversion processing with the image data stored in the display memory.