The Principle: Notes
The HUD can be compared to a projection device. A light source is required to project the HUD information. The two LED arrays (red and green) serve as the light source. The image content is created by the TFT projection display. The TFT projection display can be compared to a filter which admits or blocks light.
An optical imaging element determines the shape, distance and size of the HUD images.
The image appears to float freely over the road, the windshield acts as a deflecting mirror.
HEAD-UP DISPLAY SYSTEM LEGENDS
| Index | Explanation |
|---|---|
| 1 | LED array, green |
| 2 | LED array, red |
| 3 | Transparent mirror |
| 4 | TFT projection display |
| 5 | Plane mirror |
| 6 | Curved mirror |
| 7 | Windshield |
| 8 | Observer's point of vision |
| 9 | Projected image |