A display panel, a display device, and a signal transmission device. The display panel comprises an array substrate (111); an opposite substrate (121) arranged opposite the array substrate (111); a circuit board (131) on the side of the array substrate (111) away from the opposite substrate (121); a driver circuit (112) on the side of the array substrate (111) in proximity to the opposite substrate (121); a light-emitting component (132) on the side of the circuit board (131) in proximity to the array substrate (111) and electrically connected to the circuit board (131), the light-emitting component (132) comprising a light-emitting surface (133), and the light-emitting surface (133) facing the array substrate (111); and a light-receiving component (113) on the side of the array substrate (111) in proximity to the opposite substrate (121) and electrically connected to the driving circuit (112), the light-receiving component (113) comprising a light-receiving surface (114), and the light-receiving surface (114
