A display device comprising: a display element (OLED) configured to generate a first color light and comprising a first organic light emitting diode comprising a light emitting layer, a second organic light emitting diode comprising a light emitting layer, and a third organic light emitting diode comprising a light emitting layer, wherein the first to third organic light emitting diodes overlap respective pixel areas (Pxa-B, Pxa-G, Pxa-R); an encapsulation member on the display element (OLED) and comprising an inorganic layer at an outermost portion thereof; a color conversion layer comprising a first color conversion part configured to transmit the first color light, a second color conversion part configured to convert the first color light into a second color light, and a third color conversion part configured to convert the first color light into a third color light; a buffer layer between the encapsulation member and the color conversion layer, wherein the buffer layer has a refractive index greater than 1; and a peripheral area (NPxa) adjacent a said pixel area (Pxa-B, Pxa-G, and Pxa-R), wherein the difference in refractive index between the buffer layer and the inorganic layer is 0.5 or less, wherein the light emitting layers of the first organic light emitting diode, the second organic light emitting diode, and the third organic light emitting diode have an integrated shape and are commonly located on the pixel areas (Pxa-B, Pxa-G, Pxa-R) and the peripheral area (NPxa), the device further comprising a color filter layer on the color conversion layer, wherein the color filter layer comprises: a first color filter part overlapping the first color conversion part to transmit the first color light; a second color filter part overlapping the second color conversion part and configured to block the first color light and transmit the second color light; and a third color filter part overlapping the third color conversion part and configured to block the first color light and transmit the third color light. a display element (OLED) configured to generate a first color light and comprising a first organic light emitting diode comprising a light emitting layer, a second organic light emitting diode comprising a light emitting layer, and a third organic light emitting diode comprising a light emitting layer, wherein the first to third organic light emitting diodes overlap respective pixel areas (Pxa-B, Pxa-G, Pxa-R); an encapsulation member on the display element (OLED) and comprising an inorganic layer at an outermost portion thereof; a color conversion layer comprising a first color conversion part configured to transmit the first color light, a second color conversion part configured to convert the first color light into a second color light, and a third color conversion part configured to convert the first color light into a third color light; a buffer layer between the encapsulation member and the color conversion layer, wherein the buffer layer has a refractive index greater than 1; and a peripheral area (NPxa) adjacent a said pixel area (Pxa-B, Pxa-G, and Pxa-R), wherein the difference in refractive index between the buffer layer and the inorganic layer is 0.5 or less, wherein the light emitting layers of the first organic light emitting diode, the second organic light emitting diode, and the third organic light emitting diode have an integrated shape and are commonly located on the pixel areas (Pxa-B, Pxa-G, Pxa-R) and the peripheral area (NPxa), the device further comprising a color filter layer on the color conversion layer, wherein the color filter layer comprises: a first color filter part overlapping the first color conversion part to transmit the first color light; a second color filter part overlapping the second color conversion part and configured to block the first color light and transmit the second color light; and a third color filter part overlapping the third color conversion part and configured to block the first color light and transmit the third color light. a first color filter part overlapping the first color conversion part to transmit the first color light; a second color filter part overlapping the second color conversion part and configured to block the first color light and transmit the second color light; and a third color filter part overlapping the third color conversion part and configured to block the first color light and transmit the third color light.