A display device capable of high-quality stereoscopic display without decreasing resolution is provided. A pixel portion including a plurality of pixels arranged in matrix is divided into plural regions, lighting of backlight units each emitting light of different hues is controlled in each region, and the backlight units of the plural regions are turned off simultaneously at a regular interval so as to display black. The right-eye image and the left-eye image are alternately displayed with black display interposed therebetween, and light incident on the right eye of a viewer is blocked when a left-eye image is displayed, and light incident on the left eye of the viewer is blocked when a right-eye image is displayed. An image signal is written into a pixel in a black display period during which the backlight units are turned off.