The present disclosure provides a display panel, a manufacturing method thereof, and a display device. The display panel includes: a backlight module configured to provide a light source; a cover plate on a light-emitting side of the backlight module; a display module between the cover plate and the backlight module; and a photosensitive device configured to sense ambient light. The photosensitive device is between the cover plate and the backlight module, and at an edge of the cover plate.