LED Lighting Osram aims at adaptive headlamp
2013/09/23
By turning die on and off independently, rather than having all five on all the time, the headlamp beam can be widened and narrowed depending on driving conditions.
Done automatically moment by moment, this allows a simple form of ‘advanced forward lighting system’ (AFS) to be developed.
“Headlight systems that, for example, adapt their illumination direction to the direction of the bend when driving through curves can now be realised by automotive producers,” said Osram. “Thanks to LED technology, AFS can be implemented more simply than before because no mechanical assemblies are required to move parts of the headlight or the complete headlight.”
The standard Headlamp Pro range has LEDs with two to five die, all wired in series. In this one, individual die connections are taken out via an on-package connector.
Ultimately, AFS could be implemented using a 2d array of LED die, with data from forward-facing cameras and other sources used to decide which die is at what intensity.
“Sensors and electronic components can make high beam light without glare by flexibly concealing areas within the light cone of the headlight according to the specific driving situation and with dynamic adaptation to the positions of other road users,” said Osram.
Each die is 1x1mm, and the five die are in 5×1 row set horizontally in the headlamp.
“A distinct bright-dark contrast of 1:65 between illuminated and non-illuminated chips is required so that the AFS is as effective as possible and the light beam on the road is optimally transmitted. This means that concealed chips must be genuinely dark and must not be illuminated by their adjacent chips,” said the firm. “An integrated shutter also enables a clearly defined light beam from the headlight.”
The package is 20x21mm and produces 710 lm minimum (500mA, 25°C) over 120° angle.
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