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 the left corner of FIG. 8 ; and,

FIG. 10 is an enlarged view of the right corner of FIG. 8 .

The figures are illustrated to show color and contrast.

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