1. A display device for displaying images based on video data inputted from the outside, comprising: a display unit having a plurality of pixels, each being composed of a plurality of sub pixels having different colors or a single monochrome sub pixel; a driving unit for driving the display unit based on the video data; a still image region detecting unit for detecting a still image region from the video data; and a burn-in reduction processing unit for performing a burn-in reduction process for sub pixels located in the still image region.