A display device comprising: a photo sensor layer configured to receive light reflected from an external object; a substrate on the photo sensor layer; an optical pattern layer on the substrate, the optical pattern layer comprising a light blocking portion, and a light transmitting portion corresponding to an opening penetrating the light blocking portion in one direction; an optical filter in the light transmitting portion of the optical pattern layer; a light emitting device layer on the optical pattern layer; and a transparent layer provided on at least one of an upper portion and a lower portion of the optical filter such that an upper surface of the light transmitting portion and an upper surface of the light blocking portion are planarized, wherein the transparent layer is filled in the light transmitting portion, wherein the transparent layer includes an organic transparent material, wherein the optical filter comprises: a first filter layer having a first refractive index; and a second filter layer having a second refractive index different from the first refractive index, wherein the first filter layer and the second filter layer are alternately stacked on one another, wherein the first filter layer and the second filter layer comprise different inorganic materials from each other, and wherein the thickness of the optical filter is less than the thickness of the light blocking portion. a photo sensor layer configured to receive light reflected from an external object; a substrate on the photo sensor layer; an optical pattern layer on the substrate, the optical pattern layer comprising a light blocking portion, and a light transmitting portion corresponding to an opening penetrating the light blocking portion in one direction; an optical filter in the light transmitting portion of the optical pattern layer; a light emitting device layer on the optical pattern layer; and a transparent layer provided on at least one of an upper portion and a lower portion of the optical filter such that an upper surface of the light transmitting portion and an upper surface of the light blocking portion are planarized, wherein the transparent layer is filled in the light transmitting portion, wherein the transparent layer includes an organic transparent material, wherein the optical filter comprises: a first filter layer having a first refractive index; and a second filter layer having a second refractive index different from the first refractive index, wherein the first filter layer and the second filter layer are alternately stacked on one another, wherein the first filter layer and the second filter layer comprise different inorganic materials from each other, and wherein the thickness of the optical filter is less than the thickness of the light blocking portion. a first filter layer having a first refractive index; and a second filter layer having a second refractive index different from the first refractive index, wherein the first filter layer and the second filter layer are alternately stacked on one another, wherein the first filter layer and the second filter layer comprise different inorganic materials from each other, and wherein the thickness of the optical filter is less than the thickness of the light blocking portion.