Array substrate, display panel and display device

The invention provides an array substrate, a display panel and a display device. The array substrate comprises a display area, and the display area comprises a plurality of pixel areas; a substrate, pixel driving circuits and scanning signal lines, at least part of the pixel driving circuits and the scanning signal lines are located in the display area and located on the same side of the substrate, and the scanning signal lines extend in the first direction; at least part of the pixel driving circuit is located in the pixel area and comprises a thin film transistor; the thin film transistor comprises a grid electrode and a channel layer, and the grid electrode is the overlapped part of the scanning signal line and the channel layer; the array substrate further comprises auxiliary signal lines, and the auxiliary signal lines are located in the display area and extend in the first direction. The auxiliary signal lines are smaller than the scanning signal lines in resistance, are in different layers with the sca