An array substrate, a display panel, and a display device are disclosed. The array substrate includes a substrate and an array functional layer. The array substrate is provided with a through hole area including a through hole, a buffer area provided around the through hole area, and a display area provided around the buffer area. The buffer area includes part of the substrate and an inorganic film layer provided by the array functional layer. At least a groove is formed in the inorganic film layer around the through hole area, and the groove has a closed ring shape or a non-closed ring shape.