Portable display device

FIG. 1 is a front, right, top perspective view of a portable display device showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a rear perspective view thereof;

FIG. 9 is an exploded view thereof; and,

FIG. 10 is an enlarged view of portion 10 of FIG. 9 .

The dot-dash broken line showing in FIGS. 9 and 10 is for the purpose of illustrating a partially enlarged view of FIG. 9 only and forms no part of the claimed design.