Portable display device

FIG. 1 is a front 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 partial enlarged view of portion “ 8 ” of FIG. 6 ;

FIG. 9 is a rear perspective view thereof;

FIG. 10 is a partial enlarged view of portion “ 10 ” of FIG. 9 ; and,

FIG. 11 is a partial enlarged view of portion “ 11 ” of FIG. 9 .

The dash-dash broken lines depict portions of the portable display device that form no part of the claimed design. The dot-dash-dot broken line portions of FIGS. 6 and 8 - 11 are included to show partially enlarged views only and form no part of the claimed design.