Display device and wearable electronic device

A display device comprising:

• a processor configured to generate a region-of-interest image of a current frame based on a background image of the current frame and a line-of-sight region of a user;
• a timing controller configured to output the background image and the region-of-interest image to a display panel, and
• a buffer storing the background image and the region-of-interest image,
• wherein the timing controller is configured to:
• receive the background image, the region-of-interest image, and position information of the region-of-interest image in the background image from the processor through an interface,
• write the background image to the buffer,
• based on the position information, write the region-of-interest image to a region of a background image corresponding to the position information, and
• update at least one of the background image and the region-of-interest image to the buffer.

A wearable electronic device comprising:

• at least one sensor;
• a processor configured to generate a region-of-interest image based on a background image and a line of sight of a user tracked by using the at least one sensor;
• and
• a timing controller configured to store the background image in a buffer included in the timing controller and overwrite the region-of-interest image to the buffer based on position information of the region-of-interest image in the background image.