The ornamental design for a displaycase, as shown and described.
FIG. 1 is a perspective view of a display case, showing my new design;
FIG. 2 is a perspective view with several drawers of the display case being open;
FIG. 3 is a top perspective view with one drawer of the display case being open;
FIG. 4 is a perspective view with undergarments displayed through an upper transparent cover; and,
FIG. 5 is a top perspective view with undergarments housed in compartments of a drawer of the display case.
The broken lines showing of the under garments and its support members in the drawing are for illustrative purposes only and form no part of the claimed design.