The ornamental design for a wearablebanddisplaydevice, as shown and described.
FIG. 1 is a perspective view of a wearable band display device;
FIG. 2 is a front view of the wearable band display device depicted in FIG. 1;
FIG. 3 is a rear view of the wearable band display device depicted in FIG. 1;
FIG. 4 is a first side view of the wearable band display device depicted in FIG. 1;
FIG. 5 is a second side view of the wearable band display device depicted in FIG. 1;
FIG. 6 is a first end view of the wearable band display device depicted in FIG. 1; and,
FIG. 7 is a second end view of the wearable band display device depicted in FIG. 1.
The broken lines shown in the drawings illustrate portions of the wearable band display device that form no part of the claimed design. The dot-dash broken lines show in the drawings illustrate the bounds of the claim and form no part of the claimed design.