Yang Weiqiao: automotive lighting applications LED another spring

Currently, LED industry usher in the outbreak period, with the development of technology and its applications are also gradually expanding. Among them, in the automotive, agriculture and medical care in the three areas of the most attention, but also known as the automotive lighting LED lighting market, the new blue ocean. In July 10, 2013 at the China (Shanghai) International Forum of semiconductor lighting technology, deputy director of the Shanghai semiconductor lighting engineering research center Yang Weiqiao semiconductor lighting industry application focuses on the LED in the field of automotive lighting development.

Director Yang said that the automotive lighting in many application areas in LED because of the added value of talent shows itself, the larger market size and higher product. 2012 global automotive light output value of $2 billion 100 million, while China's LED automotive lighting output value reached about 3 billion yuan, the development trend should not be underestimated.

Since 1985 LED automobile signal lamp is first applied to the passenger car, the LED lamp with its energy-saving, environmental protection, long life, small size, fast response, seismic and other advantages gradually opened the process of LED auto lamps. Initially, LED is equipped with high-end models, but in the past two years, including Mercedes Benz CLS series, including the end of the vehicle has also been using LED, automotive lighting LED trend is becoming increasingly apparent.

Director Yang pointed out that at present, the LED headlamp is realized LED auto lamps commercialization of the latest. In addition to meet the technology on high brightness output and maintain the junction temperature below 120 DEG C, the high price also restricts the commercial development of LED htacl light. As far as the automobile headlamp is concerned, to make a product has two difficulties: optical system design and thermal design.

In optical system design, automotive LED headlamp GB25991-2010 national standard requirements, light intensity spatial distribution needs to meet the following requirements:

1 light automobile in front of the road and traffic signs.

2 cannot give to the other side of the car driver caused discomfort glare

3 near light headlamp light distribution is asymmetric

, the middle is a high intensity region, as far as possible to illuminate the road

- beam has spread in the horizontal direction, in order to see the roadside situation

In pointing to the driver's eyes in the direction of light intensity is small, does not produce glare

There is a distinct boundary between the - in the headlight of bright and dark areas (stop line)

Director Yang said that the projection lens type LED headlamp and light emission type LED headlamp can meet the above requirements.

Relative to the optical system design, how to provide a better thermal solution is more difficult. The increase of junction temperature will lead to the decrease of the optical efficiency, the deviation of the wavelength and the shortening of the lifetime. When the junction temperature exceeds 150 degrees, the lamp will fail. Yang said that the commonly used methods of heat dissipation fins, heat pipes, fans, coated with high radiation materials, etc..

In fact, as early as in the "11th Five-Year" during our country has been on the LED car lights are the focus of research and deployment. The National 863 Program "semiconductor lighting project" major projects, in 11th Five-Year to start the first project arrangement of the vehicle with the LED light source system development "," car headlight integration technology research "and" high power LED lamp research and large-scale application of "three related research topic. Have achieved excellent results.

As technology advances, the cost of the LED lamp gradually decreased, but compared with the traditional lamp, LED lamp, the price is still a certain gap. In the face of the great potential of LED in the field of automotive lighting applications, the author believes that the key to promote the LED of automobile lamps is to reduce the price of LED lamps on the premise of ensuring the quality of products.