Brightness control of the CID

The CID is a display with a so-called "transflective" surface. Transflective is a word combination of "transmissive" and "reflective". The surface reflects the daylight that strikes it and makes other displays unreadable. This reflection means that the daylight is included in the light intensity of the display. The display gains brilliance. Under poor lighting conditions or in darkness, readability is ensured by the transmissive back lighting.

The display is also heated. This improves readability and ensures that the optimized operating temperature is reached quickly even at low ambient temperatures. For brightness control of the display, a phototransistor is integrated in the CID. For brightness control, the CID also evaluates the following signals:

• Dimmer signal from the footwell module (dimmer setting) via the K-CAN
• Signal via the K-CAN from the central photosensor in the instrument panel

The display brightness (deviation of brightness) can be set. Precondition: the phototransistor works with a modulation between 1% and 50%. If the modulation of the phototransistor is greater than approx. 50%, only the phototransistor regulates the display brightness.

For brightness setting, the option "Brightness" must be selected in the "Setup" menu in the CID.