A display device and a driving method for the display device are provided. The display device includes a driving circuit, a backlight driving unit, and a display panel. The driving circuit receives a plurality of pieces of image data. The plurality of pieces of image data include first image data and second image data. The display panel receives a plurality of image display signals of the plurality of pieces of image data. The driving circuit compares the first image data and the second image data to generate a comparison result, and provides a backlight brightness adjustment command to the backlight driving unit according to the comparison result.