訂了車後, 對於選配的HUD一直很好奇是怎麼投射出來的,
剛找了一下資料, 原來是透過多次的反射得到的顯像,
有車友有興趣的話, 可參考以下聯結!
HUD 作動原理
如果有問題的話，請至其網頁裡點選，也許就ＯＫ了
以下為文章節錄，由於其文具有著作權，不知是否轉貼恰當，如有不妥，望請告知，將立即刪除！
裡面有許多圖形，恕小弟不知如何轉入，還請參閱原始文件！
資料來源：http://forums.5series.net/topic/2717-how-does-the-head-up-display-hud-work/
＂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 windscreen are largely compensated for.
- Light source
The light source is the back lighting of the projection display. This light source is a number of coloured LEDs laid out
in rows over a certain area.
SBT E60 - Head-up display BMW AG - TIS 11.05.2005 09:41
Issue status (02/2004) Valid only until next CD is issued Copyright Page - 1 -
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. When the projection display is switched on, the
cover panel helps to heat the projection display more quickly. Up to a certain temperature, the projection display
cover panel remains closed. 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 following tasks:
· Actuation of light source and of stepper motor for cover panel
The electronic circuitry includes a temperature sensor whose signal is evaluated for the actuation of the stepper
motor. At the same time, the temperature sensor protects the head-up display from overheating. The light
source is switched off if the temperature exceeds approx. 105 °C.
· Evaluating and processing incoming image information
· Generating display content
A power supply in the head-up display provides the light source with a voltage of 42 volts, transformed from the onboard
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.＂
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