A Point of Interest icon display method in a navigation system is described for displaying a POI icon at a POI point on a map. The electron emitter assembly includes a laser configured to emit a first light beam. The conduction strip is partially disposed in the insulation strip and partially exposed out of the insulation strip via the opening. Thus, it is possible to reliably prevent the falling-off of the roof molding from the mounting groove, while ensuring the workability for the roof panel.