A single claim the ornamental design for a paddleboard display device, as shown and described.
FIG. 1 is a perspective view of a paddleboard display device according to the present invention, wherein the dotted lines depict a paddleboard and a paddle carried by the paddleboard display device and do not form any part of the invention.
FIG. 2 is a front elevation view of a paddleboard display device according to the present invention.
FIG. 3 is a rear elevation view of a paddleboard display device according to the present invention.
FIG. 4 is a right side elevation view of a paddleboard display device according to the present invention.
FIG. 5 is a left side elevation view of a paddleboard display device according to the present invention.
FIG. 6 is a top plan view of a paddleboard display device according to the present invention; and,
FIG. 7 is a bottom plan view of a paddleboard display device according to the present invention.