CID: Central Information Display with LVDS interface

The Central Information Display (CID) measures 10.2 inches. The resolution is 1280 x 480 pixels. This increases the contrast and improves legibility.

The display and operating concept for control center has changed. Selection of the main menus is arranged in linear form in lists (no longer star-shaped). The sub-menus are also placed horizontally one above the other.

Fig 1: Display - CD/Multimedia With LVDS Interface Screen

Courtesy of BMW OF NORTH AMERICA, INC.

With introduction of the Car Information Computer, the LVDS data line is a two-wire connection. This new LVDS data line has the following advantages:

• Higher data transfer rate
• No difference in the signal propagation delay between the individual lines
• Simpler and lower-cost technology

A four-wire, screened cable is used for the two-wire connection. This solution involves lower costs, even though one of the 4 lines is not used actively.

Fig 2: Car Information Computer - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

To prevent EMC interference, the unused line is also earthed. The capacitive interferences of the signals are diverted to ground. Furthermore, earthed lines form a defined potential and cannot have the same effect as aerials.

Troubleshooting is made easier by a separate display.

With the following faults, the display turns orange:

• Defective picture signal from the headunit
• Interrupted LVDS data line
• Defective plug connection