The ornamental design for a digital displayunit, as shown and described.
FIG. 1 is a front view of a first digital display unit showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a rear perspective view thereof;
FIG. 4 is right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines illustrate environmental structure and form no part of the claimed design. The unshaded areas within the bounds of the broken lines or bounded by broken lines and solid lines in FIG. 1 form no part of the claimed design.