Display panel and driving method thereof, display device

A driving method of a display panel, wherein

• the display panel comprises:
• a plurality of sub-pixels arranged in an array, the plurality of sub-pixels comprising a common cathode;
• a first power terminal, electrically connected to a first side of the common cathode, and configured to provide a first power voltage to the plurality of sub-pixels through the common cathode;
• a first wire and a first switch, a second end of the first wire being electrically connected to a second side of the common cathode, a first end of the first wire being electrically connected to the first power terminal, the first switch being set over the first wire and being configured to control whether the first wire is connected or disconnected, and the second side of the common cathode being opposite to the first side of the common cathode and away from the first power terminal;
• and
• the driving method comprises:
• obtaining a total image current of a display image of the plurality of sub-pixels arranged in the array;
• and
• determining whether the total image current is greater than a first threshold current,
• if the total image current is greater than the first threshold current, controlling the first switch to disconnect the first wire, and
• if the total image current is not greater than the first threshold current, controlling the first switch to connect the first wire, so that the second side of the common cathode is connected to the first power terminal through the first wire.