Display panel, display device, manufacturing method and testing method

The invention provides a display panel, a display device, a manufacturing method and a testing method, and the display panel comprises a substrate which is provided with a display area and a peripheral area surrounding the display area, and the peripheral area comprises a lower frame area; the plurality of pixels are located on one side of the substrate and located in the display area; the data lines are located on one side of the substrate and electrically connected with the pixels, and the data lines extend to the lower frame area from the display area; each switch group comprises a plurality of switches, the plurality of switches are respectively connected with the plurality of data lines in a one-to-one correspondence manner, and one switch divides one data line into two segments and is connected with the two segments; and each control line is connected with each switch in one switch group and is used for transmitting a control signal for controlling the on-off of the switch to each switch in the corresponding switch group. According to the method, the line defect occurrence area can be effectively and quickly locked, and the line defect analysis efficiency and accuracy are greatly improved.