Abstract: In a method of positioning and fixing at least one element relative to or on a frame, in particular a display (9, 10, 11), having a mount (R), of a projection device (1) on a frame (16) for another optically active element (14) of the projection device (1) that is arranged on the frame (16), wherein the element or the mount (R) of the display (9, 10, 11) and the frame (16) are formed on plastic sections that are to be connected to one another, it is provided that, following positioning and adjustment of the element, in particular of the display (9, 10, 11) relative to the frame (16), the element, in particular display, is connected to the frame by laser plastic welding, in particular point laser plastic welding.