A display device includes: a first substrate; a second substrate; a light-emitting element layer on the first substrate and comprising at least one light-emitting element; an encapsulation layer on the light-emitting element layer and comprising at least one inorganic encapsulation layer and at least one organic encapsulation layer; a color conversion-transmitting layer on the encapsulation layer and configured to convert light emitted from the at least one light-emitting element into light having different colors, the color conversion-transmitting layer including quantum dots; a low-refractive inorganic layer on the color conversion-transmitting layer and having a refractive index less than a refractive index of the color conversion-transmitting layer; a color filter layer on a surface of the second substrate opposite to the first substrate; and a filler between the low-refractive inorganic layer and the color filter layer and having a refractive index greater than the refractive index of the low-refractive inorganic layer.