The disclosure provides an array substrate, a display panel, a display device, and a method for fabricating the same. The array substrate provided by the present disclosure includes a substrate, a wiring on the substrate, an insulating layer covering the wiring, and a protrusion on the insulating layer and located in a non-display region of the array substrate. Wherein the protrusion is adjacent to the wiring, and wherein a surface, away from the base substrate, of the protrusion is further away from the base substrate than a surface, away from the base substrate, of a portion of the first insulating layer covering the wiring.