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LED chip kindles more intelligent headlamps

Posted: 27 Oct 2014     Print Version  Bookmark and Share

Keywords:LED  headlamp  AFS 

Osram Opto Semiconductors and its partners on the µAFS research project developed a LED chip that controls 256 light points (pixels).

Up to now, pixel systems have been based on a large number of individual LEDs. The project aims to develop the technical principles for a new class of energy-efficient LED headlamps which may then provide the basis for adaptive front lighting systems. These systems will improve the illumination of the road ahead because they actively adapt the distribution of the light according to the driving and traffic situation without dazzling other road users.

The prototype was developed jointly by experts at the project coordinator Osram Opto Semiconductors, Osram Specialty Lighting, Infineon Technologies and the Fraunhofer Institute for Reliability and Microintegration IZM. In previous adaptive front lighting systems (AFS) one pixel corresponded to one LED component or one chip, whereas in this prototype one chip contains 256px which can all be individually controlled.

LED chip

The demonstrator from the project partners is the first step towards even more intelligent LED front lighting.

This is the first step to light sources with more than 1,000px. Osram Opto Semiconductors has developed the new pixel chip with defined light patterns in the colours blue and white. The challenge was to define the light points during chip processing itself and enable them to be linked directly with the control system.

Interlinked technical developments

Infineon Technologies developed the electronic driver chip for directly controlling the numerous light points individually. As the specialist in mounting technology, Fraunhofer IZM made it possible to couple the light-emitting pixel chip with the controlling driver chip. By structuring the chip surface and attaching the converter for creating white light Osram Opto Semiconductors then completed the prototype. This demonstrator proves the feasibility of the first project objective as it exhibits a particularly high resolution, which is what is needed for the light pattern to be adjusted dynamically and with a high degree of precision. In contrast to current LED-based AFS solutions, it will open up special automotive lighting options such as city lights and bad weather lights.

Other project objectives: headlamps and testing

One of the next steps will be for the Osram Specialty Lighting business unit to transfer the prototype to a light module with electrical, mechanical and thermal interfaces. The two aspects of particular interest here are intelligent control and an appropriate connection to the vehicle bus to ensure extremely fine control of the light. µAFS project partners Hella, the lighting specialist, and Daimler, the car manufacturer, will then take over.

Hella is responsible for the development of the optical system and the thermal management system, including the design of the complete headlight. Daimler has already contributed specifications and requirements with regard to the bus connection and optics within the project, and is responsible for detailed testing of the headlamp and therefore for the final process.

The prototype shows that the technical developments by the partner companies not only function separately but combine perfectly to create a completely new solution. This has been made possible only through coordinated efforts and close cooperation between all the partners involved and has required agreements at an early stage for each individual advance to be made.





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