An array substrate, a display panel and a display device are provided. The array substrate includes: a substrate body including a display area and a non-display area, wherein the non-display area includes a fan-out area in which a fan-out signal line is arranged, and the fan-out signal line is connected to a signal line within the display area. The fan-out area includes an inorganic insulation layer arranged between the substrate body and a planarization layer, the inorganic insulation layer is provided with a first groove, and an orthographic projection of at least a part of the fan-out signal line onto the substrate body is within an orthographic projection of the first groove onto the substrate body.