GF82.90-P-4020LEA Rear Display Left/Right Component Description

GF82.90-P-4020LEA Rear Display Left/right Component Description
- with CODE (864) Rear entertainment system

Component Identification:

Location
The left rear display is located on the rear of the head restraint on the front seat. The right rear display is located on the rear of the head restraint on the right front seat. The rear displays are of identical design and the decision as to whether the display is used on the left or right is made via the "Side" (left = "Side" pin to ground (c. 31), right = "Side" pin not assigned).

Task
^ Visualization of user-relevant information
^ Connection detection of connected audio and video unit
^ Power and resource management
^ Reading in of signals
^ Generation of picture signals
^ Generation of infrared (IR) signals
^ Output of audio signals
^ Transmitting signals

Visualization of user-relevant information
The following user-relevant information is indicated on the rear display:
- Graphic displays to guide user
- Operation
- Display of digital picture signals

The following audio/video devices can be connected via the AUX jack:
- Portable DVD player
- Video cameras
- MP3 player
- Game consoles

Connection detection of connected audio and video unit
The rear display recognizes whether an audio or video unit is connected to the AUX connection.

Power and resource management
The rear displays recognize overvoltage and undervoltage and react accordingly.

Reading in of signals
Signals are read in via the following connections:
^ Direct lines
^ Telematics CAN (CAN A)
^ Infrared interface

Direct lines
The following signals are read in via direct lines:
- Analog audio and picture signals from audio/video controller control unit (N66/3)
- Analog audio and picture signals from audio/video unit connected to AUX connection
- IR signals (digital) from remote control via IR interface

Telematics CAN
The rear displays are subscribers on the telematics CAN. The signals are read in by the rear displays.

The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Infrared interface
The following signals are read in via the infrared interface:
- Control signals from remote control in position "L REAR", "R REAR"

Generation of picture signals
The rear displays generate digital picture signals from analog picture signals to display the associated screen on the display.

Generation of IR signals
The rear display generate digital IR audio signals from the analog audio signals for transmission to headphones (cordless) connected via the IR interface.

Output of audio signals
Output of audio signals via following options:
- Analog (headphone wired)
- IR (headphone cordless)

The volume of the audio signals can only be adjusted via the remote control for headphones connected by cable to the integrated headphone socket. For headphones (cordless) connected via the IR interface, the volume of the audio signals is adjusted via the volume control integrated in the IR headphones.

Transmitting signals
The signals are transmitted via the following connections:
^ Direct lines
^ Telematics CAN

Direct lines
The following signals are transmitted in via direct lines:
- Electrical analog signals (frequency) (audio signals) to headphones connected via cable
- IR signals (digital) to IR headphones (cordless) via IR interface

Telematics CAN
The rear displays are subscribers on the telematics CAN.
The signals are transmitted by the rear display.
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).

Component Identification:

Design
An audio amplifier is integrated into the left rear display. The rear displays consist of 8 thin film transistor (TFT) displays in 16:9 format with a resolution of 800 x 480 pixels. The color depth is 3 x 6 Bit. The rear display can display a maximum of 262.144.