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1. A display device comprising: a substrate including a display area and a peripheral area adjacent to the display area, the display area including a light-emitting area and a light-blocking area; a first light-emitting element disposed in the light-emitting area on the substrate, the first light-emitting element emits a first light having a first wavelength range in a visible spectrum; a second light-emitting element disposed in the peripheral area on the substrate, the second light-emitting element emits a second light having a second wavelength range in a non-visible spectrum; a light control layer disposed on the first light-emitting element, the light control layer defining an opening exposing a portion of the light-emitting area; and a light guide layer disposed in the display area and the peripheral area, the light guide layer optically connecting the second light emitting element to the light control layer, wherein the light control layer includes a photochromic material such that in operation the second light transmits from the second light emitting element by way of the light guide layer to the light control layer and discolors the light control layer to at least partially block the first light.
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