The ornamental design for a displayscreen with icon, as shown and described.
FIG. 1 is a front view of a display screen with icon showing the new design; and,
FIG. 2 is a front view of a display screen icon showing an alternative embodiment of the new design.
The broken line showing of the remainder of the display screen is for environmental purposes only and forms no part of the claimed design. Applicants reserve the right to disclaim, by amendment or in a continuation application, the square frame surrounding the icon.