The ornamental design for a hanginglamp for a display screen, as shown and described.
1. Hanging lamp for a display screen
1.1 : Front
1.2 : Back
1.3 : Left
1.4 : Right
1.5 : Top
1.6 : Bottom
1.7 : Perspective view 1
1.8 : Perspective view 2
The product incorporating the design is used for illumination; the drawing designated to best show the essential features of the design is the perspective view 1.