The ornamental design for an optical displayelement for a headset, as shown and described.
FIG. 1 is a front perspective view of an optical display element for a headset showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a front perspective view of the optical display element for a headset of FIGS. 1-8 shown with additional disclaimed subject matter in uneven broken lines;
FIG. 10 is a rear perspective view thereof;
FIG. 11 is a front view thereof;
FIG. 12 is a rear view thereof;
FIG. 13 is a right side view thereof;
FIG. 14 is a left side view thereof;
FIG. 15 is a top view thereof; and,
FIG. 16 is a bottom view thereof.
The broken line showing of the remainder of the optical display element for a headset and the unshaded regions therein in FIGS. 1-16 is for environmental purposes only and forms no part of the claimed design.