Abstract: A device in a motor vehicle, with which signals which are generated by a sensor and represent a physical magnitude are transmitted on signal lines. The device includes a voltage divider which is composed of the sensor and at least two impedances which are connected each at one end of the sensor. The signals generated by the sensor are guided, via signal lines connected at its terminals, to a differentiator, by which the usable signal is obtained, and interference signals coupled onto the signal lines are eliminated. Alternatively, the device can also be used for transmission on a signal line pair of any desired potential difference present at an impedance.

Abstract: A light guide for a display device is disposed as a light-collecting film in front of or behind a display device and which detects the ambient light and the light from an illumination device incident on the display device. The illumination device is controlled by means of a light sensor disposed on a lateral surface of the light-collecting film. Because the light sensor is disposed on a lateral surface of the light-collecting film, the sensor does not disturb the beam path of the light incident on the display device. The sensor output is used to control the illumination device, which produces uniform illumination of the display device, so that its brightness matches the ambient brightness, while taking into account, by means of a correction factor, the number of display elements which are connected in an optically transparent manner.