A display device includes a substrate including a pixel region and a non-pixel region which is adjacent to the pixel region; a pixel definition layer corresponding to the non-pixel region, the pixel definition layer defining a pixel opening corresponding to the pixel region; an emission element in the pixel opening; a transistor in the non-pixel region, the transistor connected to the emission element; and a planarization insulating layer between the pixel definition layer and the transistor. In the non-pixel region, the planarization insulating layer defines a protruding portion which extends through the pixel definition layer to extend further from the substrate than the pixel definition layer.