In an example display device for displaying a stereoscopic image, plural stereoscopic pixels composed of pixels for right eye and pixels for left eye are arranged in the horizontal direction and the vertical direction. A parallax barrier according to a vertical display mode or a horizontal display mode is formed. The pixel for right eye and the pixel for left eye each include at least one sub pixel for each of red, blue, and green. In the vertical display mode, sub pixels at first intervals in the horizontal direction are not allowed to emit color lights, and sub pixels at second intervals in the vertical direction are allowed to emit color lights. In the horizontal display mode, sub pixels at second intervals in the vertical direction are not allowed to emit color lights, and sub pixels at first intervals in the horizontal direction are allowed to emit color lights.