A display device comprising: a display panel and a touch unit arranged on the display panel, wherein the display panel comprises: a substrate including a display area, and a non-display area arranged around the display area; an insulator including a valley portion, the valley portion being defined as an opening formed in the insulator and arranged along an outer side of the display area in the non-display area; and a display unit arranged in the display area and including: a thin film transistor and a storage capacitor located over the substrate, and an organic light-emitting element electrically connected to the thin film transistor, wherein the thin film transistor, the storage capacitor, and the organic light-emitting diode are provided at locations corresponding to the display area, and wherein the touch unit comprises: a reflection prevention unit that completely overlaps the valley portion in a top view, and is configured to reduce reflectivity of external light characterized in that the reflection prevention unit includes a conductive metal line, wherein in the portion where the reflection prevention unit overlaps the valley portion, a width of the reflection prevention unit is greater than a width of the valley portion. a display panel and a touch unit arranged on the display panel, wherein the display panel comprises: a substrate including a display area, and a non-display area arranged around the display area; an insulator including a valley portion, the valley portion being defined as an opening formed in the insulator and arranged along an outer side of the display area in the non-display area; and a display unit arranged in the display area and including: a thin film transistor and a storage capacitor located over the substrate, and an organic light-emitting element electrically connected to the thin film transistor, wherein the thin film transistor, the storage capacitor, and the organic light-emitting diode are provided at locations corresponding to the display area, and wherein the touch unit comprises: a reflection prevention unit that completely overlaps the valley portion in a top view, and is configured to reduce reflectivity of external light characterized in that the reflection prevention unit includes a conductive metal line, wherein in the portion where the reflection prevention unit overlaps the valley portion, a width of the reflection prevention unit is greater than a width of the valley portion. a substrate including a display area, and a non-display area arranged around the display area; an insulator including a valley portion, the valley portion being defined as an opening formed in the insulator and arranged along an outer side of the display area in the non-display area; and a display unit arranged in the display area and including: a thin film transistor and a storage capacitor located over the substrate, and an organic light-emitting element electrically connected to the thin film transistor, wherein the thin film transistor, the storage capacitor, and the organic light-emitting diode are provided at locations corresponding to the display area, and a thin film transistor and a storage capacitor located over the substrate, and an organic light-emitting element electrically connected to the thin film transistor, wherein the thin film transistor, the storage capacitor, and the organic light-emitting diode are provided at locations corresponding to the display area, and wherein the touch unit comprises: a reflection prevention unit that completely overlaps the valley portion in a top view, and is configured to reduce reflectivity of external light characterized in that the reflection prevention unit includes a conductive metal line, wherein in the portion where the reflection prevention unit overlaps the valley portion, a width of the reflection prevention unit is greater than a width of the valley portion. a reflection prevention unit that completely overlaps the valley portion in a top view, and is configured to reduce reflectivity of external light characterized in that the reflection prevention unit includes a conductive metal line, wherein in the portion where the reflection prevention unit overlaps the valley portion, a width of the reflection prevention unit is greater than a width of the valley portion.