Disclosed is a fan-out circuit. The fan-out circuit comprises a first fan-out wire group and a second fan-out wire group; the first fan-out wire group comprises a first lead and a second lead which are arranged on the same layer; and the second fan-out wire group comprises a third lead and a fourth lead which are arranged on different layers. The invention also provides a thin film transistor array substrate equipped with the fan-out circuit, and a display panel comprising the thin film transistor array substrate.