Head-down display

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A head-down display ( HDD ) is a display in a vehicle or airplane in which the driver has to look away from the roadway or flight path (mainly downwards) to get the information (e.g. the speed or Speed).

Since the driver or pilot can only see objects clearly in the so-called foveal area of the retina due to physiological restrictions and traffic-relevant information is primarily recorded via this area, he must direct his gaze back to the roadway when the traffic situation changes, which he perceives peripherally . The time he needs to do this, as well as the time to then detect and react to a hazard, can be enough to cause an accident.

In order to reduce this risk potential, attempts have been made since the 1970s to use head-up displays (HUD) from military aviation in cars. The HUD technology makes it possible to display information relevant to the driver in the windshield area so that the driver does not have to take his eyes off the road.

With a few exceptions, only head-down displays are used in today's standard vehicles.