A display device comprising: a base substrate comprising a pixel region (Pxa-B, Pxa-G, Pxa-R) and a peripheral region (NPxa) adjacent to the pixel region (Pxa-B, Pxa-G, Pxa-R); a plurality of display elements (OLED) disposed on the base substrate and overlapping the pixel region (Pxa-B, Pxa-G, Pxa-R) in a plan view, the plurality of display elements (OLED) being configured to generate a first light having a first wavelength range; a first light control layer disposed on the plurality of display elements (OLED), the first light control layer comprising: a transmission part configured to transmit the first light; a first light conversion part configured to convert the first light into a second light having a second wavelength range different to the first wavelength range; and a second light conversion part configured to convert the first light into a third light having a third wavelength range different to the first wavelength range and second wavelength range; and a second light control layer, characterised in that either: the second light control layer comprises: a first sub-light conversion part (CCL2-SUB1) configured to convert the first light into the second light, the first light conversion part overlapping the first sub-light conversion part (CCL2-SUB1) in a plan view, and a second sub-light conversion part (CCL2-SUB2) configured to transmit the first light, each of the transmission part and the second light conversion part overlapping the second sub-light conversion part (CCL2-SUB2) in the plan view; or: the second light control layer is configured to convert the first light into the second light in a region overlapping all of the first light conversion part, second light conversion part, and the transmission part in the plan view. a base substrate comprising a pixel region (Pxa-B, Pxa-G, Pxa-R) and a peripheral region (NPxa) adjacent to the pixel region (Pxa-B, Pxa-G, Pxa-R); a plurality of display elements (OLED) disposed on the base substrate and overlapping the pixel region (Pxa-B, Pxa-G, Pxa-R) in a plan view, the plurality of display elements (OLED) being configured to generate a first light having a first wavelength range; a first light control layer disposed on the plurality of display elements (OLED), the first light control layer comprising: a transmission part configured to transmit the first light; a first light conversion part configured to convert the first light into a second light having a second wavelength range different to the first wavelength range; and a second light conversion part configured to convert the first light into a third light having a third wavelength range different to the first wavelength range and second wavelength range; and a transmission part configured to transmit the first light; a first light conversion part configured to convert the first light into a second light having a second wavelength range different to the first wavelength range; and a second light conversion part configured to convert the first light into a third light having a third wavelength range different to the first wavelength range and second wavelength range; and a second light control layer, characterised in that either: the second light control layer comprises: a first sub-light conversion part (CCL2-SUB1) configured to convert the first light into the second light, the first light conversion part overlapping the first sub-light conversion part (CCL2-SUB1) in a plan view, and a second sub-light conversion part (CCL2-SUB2) configured to transmit the first light, each of the transmission part and the second light conversion part overlapping the second sub-light conversion part (CCL2-SUB2) in the plan view; or: the second light control layer is configured to convert the first light into the second light in a region overlapping all of the first light conversion part, second light conversion part, and the transmission part in the plan view. a first sub-light conversion part (CCL2-SUB1) configured to convert the first light into the second light, the first light conversion part overlapping the first sub-light conversion part (CCL2-SUB1) in a plan view, and a second sub-light conversion part (CCL2-SUB2) configured to transmit the first light, each of the transmission part and the second light conversion part overlapping the second sub-light conversion part (CCL2-SUB2) in the plan view; or: the second light control layer is configured to convert the first light into the second light in a region overlapping all of the first light conversion part, second light conversion part, and the transmission part in the plan view.