Mother substrate and display panel

A mother substrate, comprising:

• a plurality of display panels, wherein each of the display panels has a display area, and comprises a plurality of first signal lines extending from outside of the display area to the display area in parallel;
• a plurality of first test terminals, wherein the plurality of first signal lines of each of the display panels are respectively electrically connected to one of the plurality of first test terminals;
• and
• a plurality of first one-way conductive circuits, wherein the plurality of first one-way conductive circuits are respectively electrically connected to the plurality of first signal lines outside of the display area, and are configured to allow signals to be able to transmit only from the plurality of first test terminals to the plurality of first signal lines of each of the display panels,
• wherein each first one-way conductive circuit comprises a first conductive layer, a first insulation layer, an active layer, a second insulation layer, and a second conductive layer sequentially provided;
• the first conductive layer comprises a first sub-region and a second sub-region which are insulated from each other;
• and
• the second conductive layer comprises a first connection electrode and a second connection electrode which are insulated from each other, one end of the first connection electrode and one end of the second connection electrode are electrically connected to the first sub-region and the second sub-region respectively via through holes in the first insulation layer and the second insulation layer, and another end of the first connection electrode and another end of the second connection electrode are respectively electrically connected to the active layer.