Protective cover plate, display module and display device

The embodiment of the invention provides a protective cover plate, a display module and a display device.The protective cover plate comprises a cover plate substrate and a shading layer, the cover plate substrate is provided with a first area and a second area located on at least one side of the first area, the cover plate substrate comprises a first face and a second face which are oppositely arranged, and a groove is formed in the second area of the first face; the shading layer is arranged on the first face and located in the second area. The side wall of the groove comprises a light-transmitting face and a light-reflecting face, the ratio of the contact area of the light-transmitting face and the light-shielding layer to the area of the light-transmitting face is 0-10%, and a preset included angle is formed between the light-transmitting face and the light-reflecting face. According to the protective cover plate, the display module and the display device provided by the invention, the curing rate of the o