Portable display device

FIG. 1 is a top front perspective view of a portable display device showing the claimed design;

FIG. 2 is a bottom rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is an enlarged view of a portion of the portable display device labeled 9 in FIG. 8 ; and,

FIG. 10 is an enlarged view of a portion of the portable display device labeled 10 in FIG. 8 .

The dashed broken lines in the figures show portions of the portable display device that form no part of the claimed design.

The shade lines in the figures show contour and not surface ornamentation.

The dot-dash broken lines encircling portions of the portable display device in FIGS. 8 - 10 form no part of the claimed design.