Device for operating screen assembly for roof and roof for motor vehicle

A device for operating a screen assembly for a vehicle roof (2) comprises a transverse support (13) which can be coupled to the vehicle roof (2), and a display (11, 12) which is coupled to the transverse support (13) and which can be transferred from a stowed state to a deployed state by means of a guide mechanism (20, 37). According to the invention, the device comprises a guide system (60) having a cross-carrier guide element (61, 64) such that the cross-carrier (13) can be moved along the longitudinal axis (L) in a predetermined manner relative to the roof (2) in cooperation with the cross-carrier guide element (61, 64). Furthermore, the device comprises a cable storage unit (50) having a supply cable (51, 52), which is coupled to the display (11, 12) and provides a current and data technical supply to the display (11, 12). According to the invention, the cable storage unit (50) has a housing (54) for holding and releasing a supply cable (51, 52), which housing can be arranged in a section of the roof (2)