A display device includes a substrate including a display area and a peripheral area, a first insulating layer on the substrate, a first dam in the peripheral area and separated from the first insulating layer, an electrode power supply line on the substrate between the first insulating layer and the first dam, a protection conductive layer on the first insulating layer, extending over the electrode power supply line, electrically connected to the electrode power supply line, and including an uneven structure on an upper surface thereof, a pixel electrode on the first insulating layer, an opposite electrode on the pixel electrode, and contacting the protection conductive layer by extending to the peripheral area, and an encapsulation layer on the opposite electrode, and having a lower surface that contacts the upper surface of the protection conductive layer in a region where the protection conductive layer overlaps the electrode power supply line.