Case for portable display device

FIG. 1 is a top front perspective view of a case for portable display device in an open position 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 bottom view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is an enlarged left side view thereof;

FIG. 8 is an enlarged right side view thereof;

FIG. 9 is a front view thereof showing the case in a closed position;

FIG. 10 is an enlarged bottom view in two parts; and,

FIG. 11 is an enlarged top view in two parts.

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