The display device (100) including a display panel (20) including pixels (21) each of which includes a red (R) sub pixel (22), a green (G) sub pixel (23), a blue (B) sub pixel (24), and white (W)sub pixel (25), the display device (100) includes an RGB data obtaining section (110) for obtaining RGB data; and a first calculating section (1 12a) for setting luminance of a white (W) sub pixel of one pixel (21) of the pixels (21) to be substantially identical with luminance of white sub pixels of some pixels (21) of the pixels (21) in the case where the RGB data obtained by the obtaining section (100) is converted into RGBX data for each pixel.