A display panel, a method of manufacturing the display panel, and a display device are provided, the display panel includes a substrate; an underlayer on the substrate; a first electrode on the underlayer; an electroluminescent functional layer on the first electrode; and a second electrode on the electroluminescent functional layer, a longitudinal section of the underlayer has a contour which is concave from the first electrode toward the substrate as a whole, and in the longitudinal section, a thickness of a region of the underlayer close to a center of the panel is not greater than a thickness of a region of the underlayer close to an edge of the panel.