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New car lighting technology leads the road safety change

Time:2017-07-29 Views:258
A well-known by the industry and research community organizations of the German league has developed and can realize intelligent solutions for the basis of high resolution LED headlamps, this will significantly improve the adaptive headlamps system. Heads the demo model by the total project on the osram Daimler with project partners, the applications of the fraunhofer research association for the advancement, Hella companies and infineon company common development. The two headlights of the demonstration model contain three LED lights respectively, and each LED light source has 1024 individual points of light that can be individually controlled (pixel points). This means that the headlights can be adapted to the corresponding traffic conditions precisely, ensuring that the optimal lighting conditions are provided at all times and not causing other drivers to dazzle. At the same time, it can adjust the light according to the actual situation of each turning section, thus eliminating the surrounding dark area. With the help of onboard sensors, the headlamp can also analyze the surrounding environment to illuminate the car, so that not only the driver can pay more attention to the traffic. Also, because the beam does not shine directly on the driver‘s head, the other driver will be able to ride safely without a glare from the headlights. Thanks to this, drivers will no longer be able to dim the headlights when driving on the country roads. 
 
The project, funded by the German federal education and research department (BMBF) for three and a half years, has successfully developed the headlight demonstration model and completed field testing. Prior to this, the existing adaptive headlight system in the market was to install multiple LED components in front of the headlights. Other electronic components are also needed to open and close various optical segments. The number of light segments is limited because of the limited internal space of the headlamp. In this project, osram opto semiconductors, infineon and fraunhofer institute for reliability and micro integration (IZM) jointly developed with 1024 pixels can be individually controlled the innovation of the LED chip. The new solution integrates LED electronic activation into the chip, which greatly improves the resolution and still meets the requirements of limited space. In the second phase of the project, osram special lighting unit developed an LED module for this innovative high resolution intelligent automotive lighting solution. The module has an electronic and thermal interface that can be directly connected to the car‘s electronic system. 
 
Now, the project has successfully demonstrated the feasibility of this system; Intelligent high resolution headlamps will continuously and weather conditions in the case analysis of the car front road, the car speed, if there is a car, and the distance between cars and other vehicles. According to these data, adaptive light distribution can ensure that customized lighting can be provided in various situations. For example, the beam range will be extended automatically at high speed. In urban traffic, light is more widely distributed to improve safety because of better lighting in the sidewalks and surrounding areas. These functions are all electronic components, not mechanical actuators. Without blinding lights, the driver always gets the best lighting at night without adversely affecting other drivers. This is clearly conducive to improving the alertness of car drivers, thus significantly reducing the risk of accidents at night. 
 
Osram lighting co., the chief technology officer of Stefan Kampmann said, "now, we want to in this new type of high resolution LED light source on the basis of the further developed production product, we think it is very wide application prospect in headlamps." 
 
Infineon technologies has developed an intelligent driving circuit for the innovative LED chip. Thanks to this, each of its 1,024 pixels can be controlled individually. Infineon is a clever design that connects intelligent driving circuits directly to the light-emitting LED array above them. The technical challenge is to meet the special requirements of this design and support the manufacturing process of LED drive circuit. With its intelligent driving circuit and its wide range of automotive application technology, infineon supports the headlamp system in a highly innovative and adaptive trend. 
 
HellaKGaAHueck & Co defined the main technical requirements of the light source according to the functional requirements of Daimler. The lighting and electronics experts have developed the entire optical system and its cooling concept for the lighting module and produced a prototype of the headlamp. They are extremely efficient and produce very uniform light bands. In addition, each pixel can achieve excellent lighting quality. Therefore, the use of electronic components alone can produce different light bands without mechanical actuators. This is an important step towards digitalization of the lighting industry. Hella in the research and development achievements in practice its set the standard for themselves: hand in hand customers innovation lighting system, and not only to the necessary precision and quality production, and is always the pursuit of forward thinking in technology. 
 
In this research project, Daimler ag defines the functional requirements and future automotive attributes of the entire headlight system. On this basis, to determine the headlamps system component and module attributes, including architecture according to the future of sensors and cars, to calculate the best lighting distribution, and send the information to the pixel headlamps. For future electric vehicles, energy efficiency is an important requirement for these innovative leds to meet. Daimler built a car equipped with the smart LED headlights to complete the field test in actual traffic conditions. 
 
The new mercedes-benz e-class sedan USES a multi-beam LED headlamp provided by Hella, each with 84 independently controlled osram high-performance leds. Daimler has been relentless in its efforts to develop LED headlights with more sophisticated pixels, reinforcing its pioneering position in the field of headlights. 
 
In this project, the fraunhofer institute for applied research promotes the association‘s contribution to connection technology (LED and IC chip) and materials, as well as detection and isolation of defects. The extraordinary miniaturized connection technology has forged a more elaborate structure to render the product extremely high resolution. To do this, is located in Berlin, Germany the fraunhofer institute for reliability and integration of 1024 pixels (IZM) will osram LED array, SMT to infineon provides active drive circuit, which can control each pixel independently. These chips have excellent heat dissipation properties, and their mounting methods can offset the high error of microns. 
 
Two different types of pasting technology are studied: the technology of spongy nano - porous gold pressure bonding and the use of highly reliable solder - solder backflow welding technology. The results show that both of these are very successful and can provide high yield and robust interface for subsequent LED operation. 
 
One of the technical challenges of high resolution LED headlights is that there are 1024 chips that have a single pixel control that is relatively large. The higher the size of the LED chip, the higher the risk of failure or illumination of the pixels in the pixel matrix in the production process. To solve this problem, the fraunhofer institute for applied solid physics (IAF) in freiburg, Germany, has developed a new technique for fixing defects. This technology is based on ultraviolet laser micromachining process, which can repair the defects inside the LED chip during the production process. Its action principle is: to identify subtle defects, and make use of ultraviolet laser to remove material carefully, to eliminate the electrical isolation of defects or will, at the same time, the laser will not be new defects caused by the negligence, the leakage current path. After repair, the pixel will restore full illumination, and again the uniform "light belt". 
 
Fraunhofer institute for application of solid state physics (IAF) developed by the laser micro machining technology, can bring multiple economic benefits: on the one hand, it can eliminate the defects in the production process, and reduces the scrap rate of the large size LED chip production and cost; On the other hand, it can extend the average life of LED, which is an important competitive advantage and can improve customer satisfaction. 
 
The mu AFS project was funded by the German federal education and research department (BMBF), with a grant of 13N12510. The project was launched in February 2013 and ended in September 2016. The project partner has achieved the goal of developing a smart lighting solution to lay the technical foundation for a new high-efficiency LED headlight with additional road safety features. On this basis, it can be developed from the adaptive headlamp system (AFS) to create a safer road environment for drivers, pedestrians and other traffic participants.