Display controller, electronic instrument, and image data supply method

A display controller which supplies image data to a display driver which drives a display panel, the display controller comprising:

• an image memory for storing image data;
• a first rotation processing section which performs processing of writing the image data after first rotation processing into the image memory, the first rotation processing causing a vertical direction of an image of the image data to be supplied to the display driver to rotate by a first rotation angle;
• a second rotation processing section which performs processing of reading the image data after second rotation processing from the image memory, the second rotation processing causing a vertical direction of an image of the image data stored in the image memory to rotate by a second rotation angle;
• and
• a compression processing section which performs compression processing of the image data stored in the image memory,
• wherein the image data read from the image memory by a sequential access operation is supplied to the display driver without performing the second rotation processing for the image data stored in the image memory, and the image data read from the image memory by the second rotation processing section is supplied to the compression processing section.