Display panel or portion thereof with a transitional graphical user interface

FIG. 1 is a front view of a display panel or portion thereof with a graphical user interface showing a first image in a sequence of our design;

FIG. 2 is a front view of a display panel or portion thereof with a graphical user interface showing a second image in the sequence thereof;

FIG. 3 is a front view of a display panel or portion thereof with a graphical user interface showing a third image in the sequence thereof;

FIG. 4 is a front view of a display panel or portion thereof with a graphical user interface showing a fourth image in the sequence thereof;

FIG. 5 is a front view of a display panel or portion thereof with a graphical user interface showing a fifth image in the sequence thereof;

FIG. 6 is a front view of a display panel or portion thereof with a graphical user interface showing a sixth image in the sequence thereof;

FIG. 7 is a front view of a display panel or portion thereof with a graphical user interface showing a seventh image in the sequence thereof;

FIG. 8 is a front view of a display panel or portion thereof with a graphical user interface showing an eighth image in the sequence thereof;

FIG. 9 is a front view of a display panel or portion thereof with a graphical user interface showing a ninth image in the sequence thereof;

FIG. 10 is a front view of a display panel or portion thereof with a graphical user interface showing a tenth image in the sequence thereof;

FIG. 11 is a front view of a display panel or portion thereof with a graphical user interface showing an eleventh image in the sequence thereof;

FIG. 12 is a front view of a display panel or portion thereof with a graphical user interface showing a twelfth image in the sequence thereof;

FIG. 13 is a front view of a display panel or portion thereof with a graphical user interface showing a thirteenth image in the sequence thereof;

FIG. 14 is a front view of a display panel or portion thereof with a graphical user interface showing a fourteenth image in the sequence thereof;

FIG. 15 is a front view of a display panel or portion thereof with a graphical user interface showing a fifteenth image in the sequence thereof;

FIG. 16 is a front view of a display panel or portion thereof with a graphical user interface showing a sixteenth image in the sequence thereof;

FIG. 17 is a front view of a display panel or portion thereof with a graphical user interface showing a seventeenth image in the sequence thereof;

FIG. 18 is a front view of a display panel or portion thereof with a graphical user interface showing an eighteenth image in the sequence thereof;

FIG. 19 is a front view of a display panel or portion thereof with a graphical user interface showing a nineteenth image in the sequence thereof;

FIG. 20 is a front view of a display panel or portion thereof with a graphical user interface showing a twentieth image in the sequence thereof;

FIG. 21 is a front view of a display panel or portion thereof with a graphical user interface showing a twenty-first image in the sequence thereof;

FIG. 22 is a front view of a display panel or portion thereof with a graphical user interface showing a twenty-second image in the sequence thereof; and,

FIG. 23 is a front view of a display panel or portion thereof with a graphical user interface showing a twenty-third image in the sequence thereof.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-23 . The process or period in which one image transitions to another image forms no part of the claimed design.

The outermost broken line square illustrates a display panel or portion thereof that forms no part of the claimed design. The remaining broken lines illustrate portions of a graphical user interface, and form no part of the claimed design.