A method of growing a thin film onto a substrate placed in a reaction chamber according to the ALD method by subjecting the substrate to alternate and successive surface reactions. A new service andor a modification in an existing service is configurable in the at least one operator service list by means of an administration unit. Consequently, a creator of interface data to be rendered can expect a time-to-market reduction when creating interface data described in a standardized format. Directly on the layer of TCO are applied busbars by means of a printing method. The master control sends out commands or data that is interrogated by every microcontroller on each modular panel of the entire sign such that only the panel with a unique identification number will process data intended therefore.