Abstract: A flexible circuit board, a display panel, a display device, and a test method are provided. The flexible circuit board includes a flexible circuit board body and a driving chip. First to third dummy terminals are provided on a surface of the flexible circuit board body. Fourth to sixth dummy terminals are electrically connected to a common node in the driving chip. An external sink current output line and an external sink current input line form an external sink current loop through the driving chip. A bonding resistance between the first and fourth dummy terminals is a first bonding resistance, and a bonding resistance between the second and the fifth dummy terminals is a second bonding resistance. The first bonding resistance and the second bonding resistance each are a resistance on the external sink current loop.

Abstract: Provided is a display module, including: a display panel having a first binding area and a flexible circuit board having a second binding area. First binding pins provided in the first binding area are correspondingly bound to second binding pins provided in the second binding area. First and second test boards are provided in the first and second binding areas, respectively, and the first and second test boards overlap while being insulated from each other. A driving chip fixed to the flexible circuit board includes a touch sensing pin and a touch driving pin. The touch driving pin is configured to output a touch driving signal and the touch sensing pin is configured to receive a touch sensing signal. One of the first test board and the second test board is electrically connected to the touch sensing pin, and the other one is electrically connected to the touch driving pin.