The ornamental design of the present invention is for a display, such as an electronic or computer-generated display, for a signal processing device, such as an audio or video signal processing device, a signal measuring device, or the like.

FIG. 1 is a front view of a display panel with icon showing my new design showing a first image with no elements activated;

FIG. 2 is a front view thereof showing a second image with all elements activated;

FIG. 3 is a front view thereof showing a third image with specific elements activated;

FIG. 4 is a front view thereof showing a fourth image with specific elements activated;

FIG. 5 is a front view thereof showing a fifth image with specific elements activated;

FIG. 6 is a front view thereof showing a sixth image with specific elements activated;

FIG. 7 is a front view thereof showing a seventh image with specific elements activated; and,

FIG. 8 is a front view thereof showing an eighth image with specific elements activated.

The broken line showing the display panel is for illustrating environmental structure and forms no part of the claimed design.