摘要 |
PROBLEM TO BE SOLVED: To reduce the power consumption of a display controller and to reduce the competition between frame buffer access from a host and the frame buffer access in the display controller. SOLUTION: In this display controller, a comparison/count circuit 9 monitors the data passing through a display FIFO 5 by control of a compression timing circuit 11 in compression/display operation, and judges the continuous of the same data. When the continuous data exist, a compression data write-back circuit 10 forms the compression data to write them in a compression frame 2a of a frame buffer 2. In expansion/display operation, the display FIFO 5 reads out the compression data from the compression frame 2a to expand and output them. |