Abstract: An LC display is disclosed that comprises a light source (5) that provides the background illumination, that emits light of only a part of the spectrum and that is disposed on the back (9) of the liquid crystal layer (10) so as to be protected and covered while it still is able to detect or emit light through the liquid crystal layer (10). The detected light is evaluated to control the background illumination and the inventive device enables data communication with an external device.

Abstract: The invention relates to a bus system comprising at least two bus lines (11; 12) whereon a differential level is applied, said level being dominant or recessive. The bus system also comprises at least two transceivers (22) for bidirectional communication in semi-duplex operation which are connected to the bus lines (11; 12) and which transform the differential levels of the bus lines into a digital level, in addition to at least one hardware-interface (231) which is connected to one of the two transceivers (22) for asynchronous, bidirectional communication in full-duplex operation. A CAN bus can be used for storing data or for carrying out a diagnosis without the need for recalling the CAN-protocol.

Abstract: An LC display is disclosed that comprises a light source (5) that provides the background illumination, that emits light of only a part of the spectrum and that is disposed on the back (9) of the liquid crystal layer (10) so as to be protected and covered while it still is able to detect or emit light through the liquid crystal layer (10). The detected light is evaluated to control the background illumination and the inventive device enables data communication with an external device.