According to statistics, the majority of accidents occur at dusk or at night – poor visibility is often the trigger. Intelligent headlights adapt to the current traffic situation, and can be a remedy. In collaboration with industry partners, Fraunhofer researchers have developed a high-resolution illumination system with more than 1,000 LED pixels: It offers considerably more options for precise light distribution than previous solutions have and is also energy efficient.
Out at night on a winding country road. It‘s raining and, to make matters worse, the headlights from the driver behind you are blinding. This is unpleasant and may, at worst, lead to an accident. Modern headlights make nighttime driving safer by adjusting the light distribution to the current traffic situation: While they illuminate specific areas in a targeted fashion, they do not blind other road users.
Researchers at the Fraunhofer Institute for Reliability and Microintegration IZM in Berlin have collaborated with Infineon, Osram, Hella and Daimler in the composite project ?AFS to develop an adaptive front lighting system: „
We have been able to solidly connect four LED chips having 256 pixel each with the driver electronics chip. Due to this high resolution, we can control the light distribution to the smallest detail,“ explains Dr. Hermann Oppermann, Group Manager in the Department of Wafer Level System Integration at the IZM. The headlight allows permanent high beam, blinds other road users less and makes it possible to alter the light distribution according to need: such as the course of the road, the oncoming traffic as well as the distance and position in relation to other road users. Only the pixels which are needed at the moment are turned on. This is usually only around 30 percent of the total available light output of the entire system, so it is very energy efficient, since light is generated on the light source only where it is needed in the traffic area. The LED chips are currently installed in headlights.
The experts from the IZM were responsible in the project for establishing contact between the individual pixels and the driver chip in order to be able to control each point of light independently. With a pixel size of only 125 microns, that is not an easy task: „The connections have to be sturdy, and we need good thermal contact to ensure sufficient cooling of the chip,“ Oppermann explains. The Berlin researchers are pursuing two different approaches: In the first variant, a gold-tin alloy is applied in a pattern onto the chip. The technology is well established in the field of optoelectronics. Such fine grid structures with intermediate distances as small as 15 microns, as are required for the LED chip, have not previously been possible, though. In the second approach, the researchers are working with a gold nano-sponge. „This nanoporous gold structure has the advantage that it compresses like a real sponge and can be precisely adapted to the topography of the component,“ says Oppermann. A small unevenness of a few micrometers, which inevitably occurs, can therefore be compensated for easily and quickly.
This is because previous solutions have drawbacks: LED lighting systems are relatively large and expensive: one LED is needed for each point of light. Today, upLearn to 80 individual LEDs are commonly interconnected to form a system. In order to produce a coherent beam of light on the road, though, every LED has to have its own, precisely aligned optics. In another approach, the light source is a laser light or an LCD display with LED lighting, which fades areas of the light distribution according to the situation. Since light is produced and reabsorbed, this solution is not very energy efficient. The same applies to the method of shading certain areas by means of mechanical masks. In the latter system, moreover, only relatively large areas can be selectively illuminated and darkened.
Learn more: Better visibility when driving at night
The Latest on: LED lighting
via Google News
The Latest on: LED lighting
- Cyber Monday LG 4K TV Deals (2019): LG OLED TV, LED TV & Smart TV Sales Compared by Deal Stripeon December 1, 2019 at 11:14 am
An OLED TV offers brighter displays with efficiency and faster refresh rates compared to typical LED TVs. The new LG TVs with OLED design range from 55 inches, 65 inches, 70 inches up to 77 inches.
- Tender issued for installation of LED street lightson December 1, 2019 at 10:52 am
Dark spots have been a cause of concern as that impacts the safety of the public especially women and children. The Public Works Department (PWD) has issued tender for the installation of ‘Smart LED ...
- The Best Night-Time Jungle Experience You’ll Have: The Bronx Zoo And Holiday Lightson December 1, 2019 at 10:40 am
Typical zoo family under lights. “We were concerned about power conservation,” says the zoo’s director, Jim Breheny. “But with the new LED lighting, and the help of Con Edison, we’ve got more lights, ...
- Hanukkah lights up the season with fun, a call to actionon December 1, 2019 at 10:30 am
According to myjewishlearning.com, Hanukkah, also known as the Festival of Rededication or the Festival of Light, celebrates the rededication of the Holy Temple in Jerusalem after it was desecrated by ...
- ‘You Light Up My Christmas’ Lifetime Movie Premiere: Cast, Trailer, Synopsison December 1, 2019 at 5:00 am
The holiday season is getting a little bit brighter with the premiere of the newest Lifetime Christmas movie, “You Light Up My Christmas,” starring Kim Fields. Fields has been working in holiday ...
- Mile High Tree, Featuring 60,000 Strands Of LED Lights, Makes Denver Debuton December 1, 2019 at 3:40 am
DENVER (CBS4) – A 110 foot Christmas tree attraction, the tallest installation of its kind, now calls Denver home. “The Mile High Tree” is 39 feet in diameter and is covered with more than 60,000 ...
- Global LED-Based Lamps Used in Explosion-Proof Lighting Market 2019- Emerson Electric, Eatonon November 29, 2019 at 10:12 pm
Nov 30, 2019 (Eon Market Research via COMTEX) -- The industry analysis on Global LED-Based Lamps Used in Explosion-Proof Lighting Market 2019 includes the complete features of the LED-Based Lamps Used ...
- Micro-LED Lighting: Analysis of Worldwide Markets through 2019-2027on November 28, 2019 at 4:32 pm
Dublin, Nov. 28, 2019 (GLOBE NEWSWIRE) -- The "Micro-LED Lighting Market: 2019-2027" report has been added to ResearchAndMarkets.com's offering. The primary goal of this report is to identify the main ...
- LED Driver for Lighting Market Size, Growth, Trends | Koninklijke Philips N.V., Osram GmbH, Harvard Engineeringon November 26, 2019 at 7:49 pm
Nov 26, 2019 (Global Research Wire via COMTEX) -- Los Angeles, United State, , - The research study presented here is a brilliant compilation of different types of analysis of critical aspects of the ...
- West Covina to convert almost 8,200 streetlights to LED lightingon November 25, 2019 at 4:29 pm
West Covina has begun converting 8,193 streetlights in the city to LED lighting. The streetlights are owned by Southern California Edison, which is replacing the lighting at no cost to customers, ...
via Bing News