Patent 9454799 was granted and assigned to LG on September, 2016 by the United States Patent and Trademark Office.
An electronic device including a display unit configured to display a letterbox in a letterbox region and an image in an image display region; and a controller configured to display a guide image at a boundary portion between the letterbox region and the image display region, and change display sizes of the letterbox region and the image display region based on a movement of the guide image.