A display device includes a substrate including a display area and a photo sensing area overlapping the display area, a plurality of pixels disposed at the display area and having an emission area, and a plurality of photo sensors disposed at the photo sensing area and having an effective sensing area. Each of the plurality of pixels includes a light-emitting element including a display pixel electrode, an emissive layer, and a common electrode. Each of the plurality of photo sensors includes a photo sensing element including a sensing electrode, a photoelectric conversion layer and the common electrode. The common electrode is disposed between the emissive layer and the photoelectric conversion layer. A center point of the effective sensing area is located in the emission area in a plan view.