From infrared remote control to mobile phone display, from traffic lights to home appliances displays, LEDs (light-emitting diodes) are changing our city and life. After the semiconductor technology revolution, the semiconductor technology began to brew a new green "light revolution" around the world. Please pay attention---
Shanghai Oriental Pearl Tower, Wujiao Eggs, Donghai Bridge... These famous buildings in Shencheng have a common new light source--LED. They illuminate the colorful Shanghai and emit charming lights at night. Not luxurious. At the 4th China International Semiconductor Lighting Exhibition held from August 22nd to 24th, these new LED light sources shined.
LEDs, ie, light-emitting diodes, use solid semiconductor chips to emit energy, and can directly emit red, yellow, blue, green, cyan, orange, purple, white and other colorful light. The small, embedded illuminator has been used only as a power indicator for electronic devices for many years. With the continuous improvement of energy conservation and environmental protection requirements, the application range of LED new light source has been expanding. In addition to special lighting fields, large-size LCD TV backlights, automotive, commercial and industrial lighting have gradually become the main application areas of LED.
In 2006, the global LED trading market exceeded $7 billion, with an average annual growth rate of over 20%. LEDs are changing the landscape of the global lighting industry, no less than the technological revolutionary impact of the invention of neon lights and other inflatable bulbs after World War II.
Power consumption is 1/10 of ordinary light bulbs
"Replacing one-fourth of China's lighting with LEDs can save the equivalent of one Three Gorges power station in one year," said Li Yuzhi from Shanghai Semiconductor Lighting Engineering Technology Research Center. Undoubtedly, energy saving and environmental protection is the biggest breakthrough of this light source.
Experts describe the principle of LED lighting as “just like lightning.†The traditional light bulb is a power-in filament placed in a vacuum tube. The LED is a semiconductor chip that is illuminated by electrons and has a conversion efficiency of 68%. In contrast, the illumination of an ordinary light bulb is converted from thermal energy into thermal energy and converted into light energy, with a conversion efficiency of only 12%.
Because of this, LEDs have unparalleled energy saving and environmental advantages. Under the same lighting effect, the LED consumes only one-tenth of the power of a normal bulb. In special lighting, landscape lighting (replacement of neon lights) can save up to 70%, and traffic lights (instead of incandescent lights) can save up to 80%. In addition, the life of the LED is also 100 times longer than that of a normal light bulb, and the light quality is high and stable. Because LEDs use a cold light source, there is less glare, no radiation, no harmful substances in use, and waste can be recycled without pollution.
Landscape lighting "building integration"
Those who have seen Shanghai's five-pointed mocking eggs will surely remember the gorgeous lighting images of the night. It has clear pictures, bright colors and vivid life. Under the control of the computer, the images are endless. This is the credit of LED.
The lighting source of the pentagonal egg is composed of 1.42 million LED spots. If these spots are connected, it can be connected to 14 kilometers. Since the strips of LEDs are embedded in the slats of the "egg" steel frame, Without destroying its original appearance and daytime landscape, it became a colorful stage of lighting at night. It is reported that the actual power consumption of "egg" lighting is only 80.3 kWh, and the maximum peak is 7.8 per square metre. Tile, if it is a non-LED display of the same area, its power consumption is more than 10 times.
The LED light source is lightweight and compact, and can adapt to a variety of geometric sizes and different spaces. Therefore, the luminaire can be designed to be very small and beautiful, and is suitable for installation on any building structure without affecting the overall aesthetic appearance. According to Wang Weiping, deputy director of the Yangpu District City Appearance Administration, the application of LED display technology to the urban landscape can also achieve “building integrationâ€, that is, the LED light source can be perfectly combined with the urban architecture, so that the light can not be seen. Not only will the lights on the big screen flash, but more buildings will also evoke the charm of light.
LEDs are not only rich in color, but also have short response times and extremely convenient control. With the timing control circuit, various color dynamic changes and instantaneous color change can be realized. In addition, it has the characteristics of strong directionality and no visual pollution. It can use battery, solar energy, wind energy or other energy sources as its power source, so it is favored in landscape lighting engineering. The lighting display lights of the Bohai Bay Bridge under development will eliminate the need for power, cable and utility poles, and integrate "wind energy, solar energy and LED road lighting, LED landscape display".
LED industry has broad prospects for development
“If Shanghai's landmark buildings, landscape lighting and public lighting are replaced by semiconductor lighting, traditional lighting in the city will save 1 billion kWh.†It can be seen that the application of LED in Shanghai will be endless. Shanghai has developed a unique market and scientific research advantages in the LED industry. Its industrialization has begun to take shape and is seeking a new round of breakthroughs to seize the commanding heights of LED's innovative industry development. As of 2006, Shanghai has 105 LED-related patents and won numerous scientific and technological achievements awards. At the same time, it has also established more than 100 national, industry and internal standards for the optical industry.
The successful bid for the 2010 Shanghai World Expo will definitely promote a new round of development of Shanghai's urban construction, and will also provide a broad market development space for the Shanghai semiconductor lighting industry. I believe that in the near future, LED lighting will make the world more beautiful.
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