Display panel or portion thereof with transitional graphical user interface

A portion of the disclosure of this patent document contains or may contain material which is subject to copyright protection by general electric company. The copyright owner has no objection to the photocopy reproduction by anyone of the patent document for the patent disclosure in exactly the form it appears in the USPTO patent file or records, but otherwise reserves all copyright rights whatsoever.

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

FIG. 2 is a second image thereof

FIG. 3 is a third image thereof; and,

FIG. 4 is a fourth image thereof.

The appearance of the image transitions sequentially between the images shown in FIGS. 1 through 3 and FIGS. 1, 2, and 4 . The process or period in which one image transitions to another forms no part of the claimed design.

The outermost broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The remaining broken lines, illustrating portions of the graphical user interface, form no part of the claimed design.