A display device includes a display panel configured to display an image, a window member covering the display panel and having a sensing area provided with a first opening and a second opening, a proximity sensor which overlaps with the sensing area and is configured to provide a first light to the window member through the first opening and receive through the second opening, a portion of a second light defined as a reflected light of the first light, and an optical member including a prism sheet disposed between the window member and the proximity sensor. A first angle between the first light incident from the proximity sensor to the prism sheet and a normal line of the window member is greater than a second angle between the first light which passes through the prism sheet and the normal line of the window member.