DISPLAY CONTROLLER FOR MEMORY-FUNCTIONAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide the display controller for the memory-functional display device which can efficiently be reduced in power consumption. SOLUTION: A rewriting detecting circuit 7 detects whether or not rewriting into different data is performed by a graphic engine 6 after last display update by a refresh control circuit 10 and stores its information in a Tag RAM 5. The refresh control circuit 10 checks the address of the Tag RAM 5 prior to the update of display and then reads data out of a VRAM 4 and sends the data out to the memory-functional display device 3 only when the address of the VRAM 4 is rewritten into different data after the last update.