The present disclosure discloses a thin film transistor array substrate, a display panel and a display device. The array substrate includes a substrate and an electrostatic discharge circuit layer, and the electrostatic discharge circuit layer is disposed in the non-display area at a side of the substrate and includes a conductive circuit disposed around the display area and electrostatic discharge devices electrically connected with the conductive circuit. The electrostatic discharge device includes a plurality of electrostatic discharge units disposed at intervals, one end of each of the electrostatic discharge units is connected with an edge of the substrate and the other end thereof is connected with the conductive circuit.