A display device includes a display panel including a plurality of panel pixel lines, and a controller configured to control the display panel. The controller is configured to receive image data for a picture frame, generate luminance data for the display panel from the image data, and modify the luminance data for the display panel by raising luminance values of a red subpixel and a blue subpixel adjacent along a first display line to a green subpixel located at an end of the first display line at outside of the first display line, the first display line being composed of a plurality of panel pixels consecutive in the first direction and assigned luminance values higher than 0.