The embodiment of the invention provides a display panel, a display device and a control method of the display panel, and relates to the technical field of display. The problem of direct-current residual images in an LCD panel can be solved. The display panel comprises an array substrate and a cassette substrate, the array substrate comprises multiple data lines, and the array substrate or the cassette substrate comprises a public electrode. The data lines extend to a non-display area from a display area of the array substrate, and the data lines extending to the non-display area are electrically connected with a data drive circuit through turned-on first transistors. The array substrate further comprises multiple second transistors, multiple first conductive structures, at least one third transistor and multiple conductive structures in the non-display area. The first conductive structures and the second conductive structures are grounded, when the second transistors are turned on, the data lines are connected with the first conductive structures, and when the third transistors are turned on, the public electrode is connected with the second conductive structures. The control method is used for manufacturing the display panel.