The ornamental design for a display frame, substantially as shown and described.
FIG. 1 is a front perspective view of a display frame showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is an elevational view taken from the side opposite that of FIG. 3.
The characteristic feature of my design resides in the configuration of the raised ridge surrounding each display area surrounded by a second raised ridge with the face of the frame extending beyond the raised ridges and the configuration of the rear support bracket.