A display device having a first substrate, a photosensitive layer, a liquid crystal layer, a second substrate, and a collimation layer that are stacked successively. The photosensitive layer comprises a plurality of photosensitive units. The second substrate comprises a plurality of display units and a shutter layer having a plurality of first holes, any adjacent two of the display units are spaced by the shutter layer, and one of the first holes is located between any adjacent two different ones of the display units. The collimation layer comprises a plurality of collimators, each of the plurality of collimators defines a second hole communicated with a corresponding one of the first holes and facing a corresponding one of the photosensitive units, and a light signal passes through the second hole and the corresponding one of the first holes and reaches the corresponding one photosensitive unit.