The ornamental design for an electronic imagedisplay, as shown and described.
FIG. 1 is a front elevational view showing our new design (the front, rear, left side, and right side elevational views and top plan view being identical);
FIG. 2 is a bottom plan view thereof; and,
FIG. 3 is a front perspective view thereof (the front, rear, left side, right side, and top perspective views being identical).