A technique of suppressing variations in property changes of switching elements in drive circuits provided for each gate line to reduce display performance degradation is provided. An active-matrix substrate includes: a plurality of drive circuits (11) provided in a display region for each gate line, for switching the gate line to a selected state; and a signal supply unit (12g) for supplying control signals (GCK1, GCK2, CLR, VSS) to each of the plurality of drive circuits for each gate line. The drive circuits (11) each include a plurality of switching elements that are turned on or off in response to the control signals. At predetermined time intervals, the signal supply unit (12g): supplies, to at least one of the plurality of switching elements in any of the plurality of drive circuits, a stop signal that holds the switching element off; and supplies, to each of the other switching elements in the drive circuit and the plurality of switching elements in each of the other drive circuits, a drive signal that turns the switching element on.