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A piece of news has made people who are concerned about car LEDs shine. TS3 Solid State Lighting's market-leading flip-chip packaging products TH3 series products have successfully cut into the automotive lighting market with excellent performances such as shock resistance, heat resistance and high reliability. It is said that a variety of products of Taiji Solid State Lighting Co., Ltd. have been successfully introduced into the design of automotive lighting modules. Among them, the professional automotive lighting production factory Zhiming Electronics has successfully passed the test and fully introduced the application, and it is expected to be promoted to the European and American markets soon.
LED R&D vendors for automotive applications are highly motivated, and LEDs do attract the automotive market with its uniqueness.
LED light sources have many advantages in automotive applications, such as: first, energy saving, and low cost. In the car, the same daytime running lights, the energy consumption of LED components is only 1/20 of that of halogen lamps. Secondly, the life span is very long, and the LED components currently used in automobiles can basically reach the level of 50,000 hours. Well-known automotive lighting suppliers have been able to provide LED components with a lifespan of up to 100,000 hours. In contrast, the life of the xenon lamp is only about 3,000 hours. And LEDs make the shape and lines of the headlights richer, and the recognition at night is higher. Third, the durability is good, the LED components are simple in structure, impact resistance and shock resistance are very good, and can be well adapted to various environments. Fourth, the LED components are small in size, easy to arrange and design. This is a huge advantage of LEDs, fully catering to the evolutionary needs of automotive manufacturers in design. Fifth, the response speed is fast. The LED lighting only needs microsecond level. It can be quickly lit up on the tail light and the turn signal to achieve better warning effect. It is used on the headlights and has more light than the xenon lamp and the halogen headlight. High response speed, better protection for driving safety. Sixth, the brightness is low, the brightness of the LED is high, and the brightness of the light is much lower than that of the halogen lamp. It is suitable for warning lights such as lighting and brake lights and turn signals. Seventh, low-voltage DC can be driven, the load is small, the interference is weak, and the requirements for the use environment are low. Unlike the xenon lamp, a boosting device (high-voltage package) is required.
These factors are obviously helpful for energy saving and driving safety.
In order to make driving safer, the EU first announced in September 2008 that since February 2011, all new models of cars and minivans must be equipped with daytime running lights; other trucks and buses are from August 7, 2012. A daytime running light is required. In addition to the EU, other countries and regions have begun to regulate the installation of new cars for all types of cars. In addition, the European Union, the United Kingdom, Japan, New Zealand, Australia, Taiwan, Canada, the United States, Argentina, etc. have officially announced that the incandescent lamp will be completely banned and banned by 2014 at the latest.
The application of the LED in the car begins with the dashboard light. For example, Mercedes-Benz and Audi use white, BMW uses orange, and Sic Bo uses green LEDs as indicators for the dashboard and control unit. With the decline in the price of LED products, the application of LEDs in the car has extended to reading lights and foot lights, such as Toyota and Audi, which use white LEDs as interior reading lights.
In the vehicle signal lights, the history of LED use has been around 20 years. Before 2000, some car manufacturers used LED light sources as the rear-end light source. In 2000, Cadillac first used LEDs for the taillights.
Most of the LED taillights used were high-priced cars. Now, LED lights are spreading toward civilian models. For the more demanding headlights, it is expected to gain market gain as LED brightness increases and prices fall.
The LED light source for vehicles is particularly special. These taillights, third brakes, directional lights, side lights, low beam lights, and floodlights all require high lumens, and the lumens count depends on the efficiency of the optical equipment used. The more economical the optical system used for illumination, the lower the lumens required for display applications. Usually, the requirements for the third brake light are 25 to 60 lumens, and the direction lights are 50 to 120 lumens, which may vary according to European and American or other regional standards. In addition, the low beam and the headlights require high brightness, and the decree requires a headlamp lumen of 1,500 lumens. This data varies depending on the optical and temperature system scheme used. Xenon lamps or other lamps have strict requirements on the uniformity of the light source, but limited by the physical characteristics of the LED, it is still necessary to further develop the technology to find a breakthrough.
Intelligent applications are also a potential advantage of LEDs. Philips has revealed that the future LED lighting is not to bring higher light efficiency, but better light. Nichia Hiroki, the latest Japanese-based LED light auto-dimming system that automatically adjusts brightness according to the external environment, points out that in addition to high light efficiency, light quality, size and intelligent control systems, etc. It will be the focus of future LED lighting development. Texas Instruments (TI) has introduced a ZigBeeLightLink development kit that simplifies the development and control of wirelessly connected LED lighting products. The latest kit supports a simple cloud gateway connection, making it easier to connect LED bulbs and other lighting products to the Internet of Things via the ZigBee network. In the car, intelligent lighting is a popular trend in the future, such as adjusting the brightness of the light as needed, and automatically adjusting the interior lighting with external light.
Even so, the shortcomings of LED lights are obvious. First, LED lights are more expensive than ordinary lights. Second, the popularity of car headlights is difficult, and heat dissipation is not good. For example, even if the small amount of heat is concentrated on the chip-sized device to conduct and diverge, the heat capacity of the device will cause a sudden rise in the temperature of the LED, and the heat dissipation process is not easy to cause light decay, which affects the service life of the lamp. Both of the above points need to be expected to further advance the technology. Third, the industry standards are missing, the quality of the products is uneven, and the prices of different LEDs in the same product vary greatly. Among them, high cost is not a major problem, and product reliability and batch quality issues are more important.
The light radiation of automotive LEDs is also a potential problem. According to the published International Lighting Commission CIES009/IEC62471 and IECTR62471-2, in the actual LED product application, the potential photobioradiation hazard of LED should also be considered. For example, this hazard may be manifested by the effect of blue light on the cornea of ​​the human eye. In recent years, research has also pointed out that due to the increasing use of ultraviolet LEDs, the near-infrared radiation hazard should also be included in the application test of LEDs. Depending on the application, LEDs can also have a health impact on people due to flicker and some long-term photobiological effects. This may not be a big problem for in-car reading lights, but the user experience will be more and more demanding.
At present, although high-power LEDs have already appeared, the decline in the production cost of automotive LEDs worldwide, the quality and safety of LEDs will still be the main factors affecting the large-scale application of automotive LEDs in the future. In addition, the probability of LED problems is not low. As the end consumer's requirements for the appearance of the lamp are getting higher and higher, and the number of LEDs for the lamp application is increasing, the probability of LED problems increases. Therefore, the requirements for the performance and reliability of LED products are getting higher and higher, and the requirements of LED suppliers for LED manufacturers will become more and more demanding. This information will eventually improve the performance and security of the LED itself, and the market can be regulated, which in turn is more conducive to the healthy development of LED.
LED-illuminated cars are not just growing in markets such as Europe. In China, new energy vehicles have entered the 12th Five-Year Plan of China, which is part of the national low-carbon, energy-saving and environmental protection industries. It is in line with the national industrial support policy and belongs to one of the areas of LED industry extension. With the sustained and rapid development of China's economy and the acceleration of urbanization, the demand for automobiles will continue to grow for a long period of time in the future.
In this way, whether from the development trend of LED technology or the application trend of the market, automobiles have become an important part of the LED market. Under the demand and challenge factors, with the continuous maturity and standardization of LED technology, it is believed that the LED industry will grow healthier in the automotive industry.