HUD Display
The head-up display is installed above the steering column in the instrument panel.
The key components of the head-up display are:
- 4 mirrors - The 4 mirrors ensure that the contents of the projection display appear at the distance and in the size required, and that deformations caused by the windshield are largely compensated for.
- Light source
- The light source is the back lighting of the projection display. This light source is a number of colored LEDs laid out in rows over a certain area.
The light source is actuated by the electronic circuitry in the head-up display, which also controls the brightness of the display content.
- Projection display with cover panel
- The projection display with TFT technology (TFT = thin-film transistor) is used to show the display contents. The projection display is activated by the electronic circuitry of the head-up display.
A cover panel protects the projection display when it is switched off.
A stepper motor folds the cover panel out of or into the beam. The stepper motor is actuated by the electronic circuitry in the head-up display.
- Electronic circuitry - The electronic circuitry has the task of evaluating and processing incoming image information, generating display content, and the activation of the projection light source and the stepper motor for the cover panel.
The electronics include a temperature sensor which protects the head-up display from overheating. The projection light source is switched off if the temperature exceeds approximately 105°C.
A power supply in the head-up display provides the light source with a voltage of 42 volts, transformed from the on-board supply voltage.
A 12-pin connector on the head-up display creates the connection to the vehicle electrical system.
The MOST data bus is connected to the head-up display via a 2-pin connector.
The image is formed on the projection display and is illuminated by the light source. The curved mirrors and the flat mirror determine the shape and the size of the projected image.
If the projected image is not level, this can be corrected by turning the projection display with the flexible shaft.
The virtual image appears to float in the air at the end of the hood, approximately. 2.2 meters away from the observer. The size of the virtual image is approximately. 20 x 10 cm (width x height).