A display panel includes a plurality of display signal lines positioned in a display area. A plurality of test pads are positioned in a peripheral area around the display area and are respectively connected to the plurality of display signal lines. The plurality of test pads include a first test pad positioned at an edge of the peripheral area and a second test pad positioned at the middle of the peripheral area. A shorting bar is connected to the plurality of test pads through a contact assistant. The first test pad is connected to the second test pad through a connection line.