LED car light development prospects

Standards and Designs of LED Car Lights At present, no matter the domestic and foreign countries adopt the conventional requirements of traditional tungsten lamps and halogen lamps as standards, there is no independent production standard for LED lamps and lanterns. Therefore, currently, the design and production basis for the production of vehicle lamp assembly produced by LED lamp manufacturing enterprises is still based on national standards, SAE standards, etc. In order to make the light distribution and appearance of the LED lamp light source conform to the traditional standards, the LED light source must be designed into a three-dimensional array and be adjusted. LED lighting direction to achieve the purpose of light distribution, automotive lighting design is a new technology. Because of the monochromaticity of the LED light source, LED elements with different wavelengths can be directly used to design turn signals, brake lights, and reversing lights with different functions without adding color filters. The addition of a color filter also increases the transmittance of light (the transmittance of the filter using a transparent polycarbonate or plexiglass is 92-95%), thereby improving the utilization of light.

In addition, the LED components used in LED lamps meet the requirements of traditional light distribution standards. The selection of the angle is very important. The correct light emitting angle means that the correct number of LED components can be used to achieve economical and practical purposes. Because the LED has little lateral astigmatism, the reflector effect of the lamp is less noticeable than that of a traditional light bulb, so the distribution of the LED light source array must be dispersed. On the contrary, it is contrary to the conventional light bulb, and the purpose of the dispersion is also more consistent with the visual habits. The heat dissipation design is a crucial part of the LED lamp design work. Whether the heat dissipation is good or not determines whether the service life of the lamp can reach the set value.

Vehicle LED lights are divided into two major categories of decorative lights and functional lights. Decorative lights are mainly used for beautification inside and outside the car. At present, many control circuits are used to achieve a variety of decorative effects. The function LED light is most suitable for the back light display of the digital instrument assembly, the front and rear lights, the brake light, the position light, the reversing light, the fog light, and the reading light. Regardless of the type, they all have many advantages such as no delay, energy saving, longevity, low heat, shock resistance, and high color purity, and they have become inevitable replacement products for tungsten lamps and halogen lamps.

Current domestic situation:

LED lights are the development trend The use of LED lights in domestic cars is less than 1%, compared with New Zealand and other countries where the use of LED lights reaches 30%. The main obstacle for the development of LED lamps in the Chinese market is the cost issue. LED chip production technology is difficult, the threshold is high, the crystal temperature, humidity, power supply, dust removal requirements are very strict, the initial need to invest heavily in building factories. At present, the main origin of LED chips is China's Taiwan, which accounts for 47% of the LED market. LED chips in China are mostly resin-encapsulated, and chips need to be imported in large quantities. This is a major reason for the high cost; the second is the domestic automotive industry. Manufacturers and consumers do not have enough knowledge of LED lights. They are accustomed to comparing the cost of LED lights with conventional lights, affecting the rapid development of the LED light industry, and at the same time, also encouraging some workshop-type processing companies to Low-quality products mix into the LED lamp market.

However, with the rapid development of China's auto industry, this bad phenomenon has received more and more attention and effective control, especially the full-speed development of the automotive market in the past year, and has strongly driven the development of China's LED lamp market: In 2003, we The Buick Regal concept vehicle equipped with a full range of LED headlights in addition to headlamps was successfully launched. In the second half of 2004, although the momentum of high growth in China’s automobiles has declined, the competition in the auto market is still fierce, with new models and new models. The continuous introduction of models has further accelerated the development and development of new LED lights. Among them, Toyota, General Motors, and Chery Automobile Manufacturing Co., Ltd. are responsible for the demand for models in this area. In particular, they have introduced the design requirements and plans for 7 LED signal lamps of 4 models, which indicates that LED is used in automotive applications. The field has broken through the small range of high brakes and entered a new stage.

Prospects:

LED lights are a major trend in the development of car lights. The common demand for lights and lighting is increasingly stimulating the rapid development of the LED chip industry. In the next five years, the quality and output of domestic LED chips will surely increase significantly. And change.

The dazzling product of the future market

The combination of automotive machinery and electronic technology is a trend in the development of the international automotive industry. To a certain extent, the degree of automotive electronics has become one of the important indicators for measuring the level of automobiles. As a result, major automakers in the world have invested heavily in the development of a large number of automotive electronics products to equip new vehicles to make them more advanced, safe, comfortable and luxurious. At the same time, they have also achieved energy saving, environmental protection and multi-functionality. Thus improving its competitiveness. It can be said that in the next decade or so, the competition in the auto market will, by its very nature, be the competition in automotive electronics. According to preliminary forecasts, the price of automotive electronic products in vehicle costs will gradually exceed 45%.

At present, many automotive electronic and intelligent products that have been developed and mass-produced in advanced countries include: Engine Integrated Management System (EMS), Automatic Transmission System (ATS), Suspension Control System (TEMS), and Steering Control System (ECPS). Anti-lock braking system (ABS), airbags, collision avoidance systems, information and communication systems (including GPS, INS, ICC, AHS, etc.) and new, intelligent automotive lamps.

Compared to the most primitive candle lamps, and incandescent lamps that are commonly used in the future, even new HID lamps and LED lamps have appeared in recent years. Undoubtedly, LED lights with good quality, high quality and unique advantages are well-known as "car lamps that don't need to replace bulbs in a lifetime".

At present, many high-end cars in the world, such as Cadillac, BMW, Toyota, Mercedes-Benz and Ford, have also launched new-style cars equipped with various brilliant LED lamps to attract customers.

China's LED lights to the development of personalized, artistic direction

Automotive lamps and lanterns have very high requirements on the parameter performance of LED components. They are mainly embodied in three aspects: first, they require high efficiency, high power and high reliability (-40°C-125°C), and second, stability of electrical and optical parameters. High consistency requirements, such as: the same batch of components of the threshold voltage inconsistency must be less than 0.1V, monochromaticity is better, the color difference must be in the range of less than 5 nm; third is the LED component at 136V after 2000 hours (DC After working, the attenuation of luminous intensity is less than 20%.

At present, with regard to the market situation of automotive LED components, the United States Lumileds and Germany Osram have occupied most of the market share with high-quality, multi-category lamps; at home, in China's Taiwan and enterprises in the Pearl River Delta and Yangtze River Delta, The development is also in good shape. Especially in the past two years, their quality has been significantly improved, and the image of “relying on a cheap market to win a certain market” has been gradually changed, and remarkable progress has been made in terms of high power.

Therefore, from the above analysis is not difficult to find: At present, China's LED high position brake lamps have been further popularized, prices have steadily decreased, and LED rear brake lights, turn signals and fog lamps have begun commercialization, the entire LED automotive lighting has been moving towards personalization and artistic development. At the same time, the LED intelligent control system has also developed rapidly. At present, the key research direction of LED automotive lamps is the combination of white LED headlamps, and LED lights and AFS (adaptive headlight control system). Among them, the research of high-efficiency, high-power, high-reliability LED components, lighting and special heat dissipation technologies, and optical design are the key to the entire technology.