A display device (liquid crystal display device 100) includes a display panel (10) (liquid crystal panel 10), light receiving sensors (first light receiving sensors 122), and an image changing section (250). A display region (10a) of the liquid crystal panel (10) has a plurality of pixels (30) located therein. The first light receiving sensors (122) receive external light directed to the liquid crystal panel (10), at a plurality of positions in the display region (10a). In the image changing section (250), a reference value is predefined for light receiving information (a1 through d1) obtained by the first light receiving sensors (122). When light receiving information (a1 through d1) exceeding the reference value is obtained by the first light receiving sensors (122), the image changing section (250) changes an image to be displayed on the display region (10a), based on the light receiving information (a1 through d1).