The ornamental design for a displaydevice, as shown and described.
The new display device can be used for various occasions, such as, weddings, anniversaries, graduations, births, bereavements, for the deceased, celebrations, honors and awards and can be mounted on a surface.
FIG. 1 is a front elevational view showing my new design for display device; and
FIG. 2 is a left side elevational view thereof, the right side being a mirror image; and,
FIG. 3 is a top plan view thereof, the bottom view being a mirror image; and the rear view is flat and unornamented.