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LED lamps in automotive applications
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http://www.wphidled.com/
Sales Manager : Amy Feng
MSN : Amy@wplamps.com Email : Amy@wplamps.com
Alibaba: cn220020193 Phone: 0086-13126403867
As essential to the safety of motor cars and parts, auto lamps in automotive active safety is crucial. The late 80's with high-brightness light emitting diode technologies emerge, LED exterior lighting applications in the car as possible. LED reliability, long life, high color purity, fast response, small size and ease of design, etc., to get the car more and more popular lighting applications. Into the twenty-first century, LED lights have become the new darling of Motor Trend, is widely used in turn signals, brake lights, signal lamps on, and applied to headlamps, to achieve integration with the AFS system.
1 Introduction
In 1885, German engineer Karl Benz (Karl. Benz) developed the world's first gasoline-powered three-wheeled diesel, car was born and developed rapidly. However, poor lighting in the area at night or traveling, we must have lighting, which in the nineteenth century produced the first 80 years --- Classic Car automobile headlamp lamp hanging gas lamps, and in 1912 appeared The first electric headlamps. Early cars using a tungsten incandescent headlamp, the dim lighting is only suitable for slower cars. Increasing in the vehicle, increasing the speed situation, the development of automotive headlamps and halogen headlamps higher brightness, high-intensity gas discharge headlamps, and the emergence of beam light, high beam, front fog lights and other light species. Meanwhile, the lighting is not only forward looking, looked around and remove the need to worry about, was born, such as brake lights, turn signals, rear fog lamps and a series of species, in order to avoid driving at night or rear-end collision when turning from a key role.
Essential for the safety of driving a vehicle parts, auto lamps in automotive active safety is crucial. According to statistics, lack of natural light at night or under the total traffic accidents occurred in 25% and 50% of the casualties occurred in the night. ECE regulations in more than 100, with the lights on, nearly 40 laws and regulations. 70 of the current car a number of mandatory testing of products in related projects with the lights account for nearly 25.
Therefore, in order to improve traffic safety, more and more new technologies are increasingly applied to the automotive lighting, such as the side of the optical fiber transmission technology turn signal, headlight AFS technology. Of course, this also includes LED technology (Light Emitting Diode, referred to as LED) lamps in the car, especially on the application in the automotive headlamp. In recent years, automotive design, LED lights use more and more, to increase the appearance of modern cars, but also as more people are familiar with and lead the development trend of today's automotive lighting and direction.
2 LED lamps in automotive applications
LED light source is a field, it is the electricity directly into light of semiconductor devices. LED light-emitting pn junction at both ends of principle is added in the forward voltage, the p-n area will flow in the hole; n area of electronic will flow p zone. With the release of electrons and holes on the energy complex, part of the energy into heat, the other part of the energy into light. This new generation of solid-state luminescence came from the 20th century, 60 years, and in instrumentation, telecommunications, and preliminary indications of the application, the early formation of the LED application market, but because of its light intensity, light attenuation performance issues that can not be widely applied in automotive lighting.
The late 80's with high-brightness light emitting diode technologies emerge, LED light signals in the vehicle applications become possible. Typical landmark event: the 1988 Nissan 280Z car for the first time in the production of 72 STANLEY AlGaAs high-brightness red LED brake lights of a vehicle. Since then, LED officially entered the automotive lighting market.
90, LED material development of the evolving, Toshiba and Hewlett-Packard in 1991 to jointly develop AlGaInP (InGaAlP) made of four elements of high-brightness LED. Technically and mass production for automotive LED lamps light of the paved road.
Into the * first century, LED technology advances, and gradually replace the incandescent lamp, vacuum fluorescent and other traditional light sources are widely used in automotive instrument combination of backlight, operating switches, dome light, reading lights, door locks, lights and other car lighting. In addition, LED reliability, long life, high color purity, fast response, small size and ease of design to highlight the advantages in automotive exterior lighting has also been increasingly common applications. Especially in recent years, LED lights are widely used in turn signals, brake lights, position lights, reversing lights, fog lights, license lights, lamps, and has become a new favorite car trend.
Currently, more than 80% of European and Japanese auto systems installed LED brake lights. Market, several major car leading manufacturers continue to introduce the LED light source for new car, like the Japanese in the Toyota, Mitsubishi, Honda, Nissan and other manufacturers introduced Teana, Crown, Reiz, the U.S. Department of General Motors Corp's Cadillac, Buick, and Germany Department depot Mercedes-Benz, BMW, AUDI, etc. have been used LED taillights, and gradually formed a LED automotive lighting industry.
With the development of LED module technology, high light output LED modules are also successful launch, such as white Luxeon LED module developed by Lumileds, OSRAM's "OSTAR" white LED modules, making the LED headlamp in the car on the application are also possible, and led the a new generation of headlamp technology trends. However, due to high cost limits, the current LED headlamps are used in luxury vehicles. In 2004, Audi A8 6. 0L used luxury car for the first time in six white Lumileds Luxeon LED as the daytime running lights.
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