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

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