Head-mounted Display Device

FIG. 1 is a perspective view of a head-mounted display device showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The broken lines in the figures show portions of the head-mounted display device that form no part of the claimed design.