A display device and a display method are provided, and the display device includes: a first panel which includes a plurality of light-blocking units and a plurality of pixels, each of the light-blocking units being between the pixels adjacent to each other; and a second panel which includes a first light-emitting plate provided with a plurality of light-emitting units, a distance from the light-emitting units to the first panel being one of H1=BS/(L−B), H2=(P−B)S/(L−P+B) and H3=PS/(L−P), in which B is a width of each of the light-blocking units between the pixels adjacent to each other, S is a viewing distance for a viewer, L is a pupillary distance between a left eye and a right eye of the viewer, and P is a pitch of the pixels of the first panel.