An array substrate and a display device are provided. The array substrate comprises: a plurality of gate lines arranged in parallel, a plurality of common electrode lines and a common electrode signal line which is disposed in a non-display region on the array substrate. Each of the gate lines corresponds to one common electrode line. Each of the common electrode lines is electrically connected with the common electrode signal line through a corresponding signal line through-hole region. The signal line through-hole region is provided with at least one identification through hole, the signal line through-hole region is configured for indicating a number according to a position of the identification through hole. The array substrate can reduce the frame width of the display device.