Digital Light - From Bulb to Interaction
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Digital Light – From Bulb to Interaction
© Hella
AUTHORS
Dr.-Ing. Tobias Wartzek is Head of Platform Development for Lighting Electronics at Hella in Lippstadt (Germany).
With the new possibilities of digitalization, headlamp technology can be developed to highly adaptive functions. Thus the function goes far beyond seeing and being seen. Hella is developing an LED SSL headlamp with ever-increasing pixel numbers that can interact with the environment because it uses Solid State Lighting technology.
INCREASINGLY HIGHER PIXEL NUMBERS
Dipl.-Ing. Mario Saure, MBE is Head of Product Segment for Lighting Electronics at Hella in Lippstadt (Germany).
Dr. rer. nat. Carsten Wilks is Head of Light Innovation at Hella in Lippstadt (Germany).
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The first headlamps with bulbs had two aims: to see and be seen. They could only be switched on or off. The light distribution generated was fixed by means of the electrical-mechanical construction. The arrival of the first roller systems already allowed the light distribution to be altered (for example for the town light or the motorway light) despite a fixed light source. However, it was only with LED technology that the first matrix systems became possible, systems which in line with the current state of the art allow between 13 and 100 pixels to be individually controlled. Currently this
development is culminating in increasingly higher numbers of pixels, which in the final analysis no longer sets limits to the implementation of novel lighting functions and allows for an interaction with the environment. Even if from the legal standpoint all conceivable functions are not yet permitted, there is a large number of possible use cases. Alongside the continued improvement of already established lighting functions such as the adaptive, glare-free high beam, these cases are primarily safety- and comfort-relevant functions, which provide active support for the driver in darkness. FIGURE 1 shows the projection of a visual lane assistant during an overtaking maneuver
FIGURE 1 Traffic lanes, projected on the road, from the visual lane assistant create a higher level of road safety (© Hella)
in an area of a construction site where lanes are narrow. Partial masking of oncoming automobiles is also possible, the lighting of traffic signs or the deliberate, dynamic illuminating of pedestrians or cyclists, FIGURE 2. Other perspective application scenarios show the projection of information or symbols onto the road. These could be, for example, symbols for interaction with the driver such as a snowflake in the case of icy roads or the status sign of a battery, which could thus replace images
projected in the head-up display. Even the projection of symbols for the pas senger car’s interaction with other road users is possible – such as the information stating that a driverless car has recognized a pedestrian crossing the street. In the field of individualization, it is possible for freely defined coming home and leaving home scenarios to be set up. Similarly, in future small displays will
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