The emergence of high-brightness LEDs is epoch-making, and it will be one of the greatest inventions after humans invented incandescent bulbs. The earliest developed LEDs only emit red light for the indicator lights in electronic devices. Today, LEDs can emit red, yellow, blue, green, orange, amber, blue-green two-color, red-green two-color, yellow-green, pure green, emerald green, white various beams. In all major cities in China, the glare of LEDs is everywhere, and LEDs are changing our living and working environment.
After the microelectronics revolution, semiconductor technology is gestating a new industrial revolution, the lighting revolution. LED has become a shining symbol of the information age and will gradually replace traditional lighting technologies such as incandescent lamps and fluorescent lamps.
Outstanding advantages, wide use
People who have been to Times Square in New York may not forget that the high-quality Coca-Cola advertisements are clear, colorful, lifelike, and the images under computer control are endless. In fact, as early as the early 1990s, billboards or road signs with LED lighting appeared on the highways of Munich Airport in Germany and France and Spain. You don’t have to climb to open the light box during maintenance, just open the light pipe on the ground. The light source box can replace the light source.
The LED is glamorous and has many advantages. In addition to long life and low energy consumption, LED has three advantages: the application is very flexible, and it can be made into light, short and short products in various forms such as points, lines and surfaces. Second, the environmental benefits are better, due to the spectrum. There is no ultraviolet light and infrared light, neither heat nor radiation. It is a typical green lighting source, and the waste can be recycled without pollution. Third, the control is extremely convenient. As long as the current is adjusted, it can be dimmed at will, and the combination of different light colors. With a variety of changes, the use of timing control circuits can achieve a variety of dynamic changes.
LEDs can be used not only for large advertising displays, but also for architectural and traffic lighting. LED as the night lighting of the city's key buildings, can be used to outline the contours, can simulate any color, the loss of luminous flux and maintenance costs are greatly reduced. Due to its small size, LEDs are suitable for making line lamps, LEDs are used as ground lights, indicating directions, trails and lanes, safe and reliable, and durable. In the past, in the night sky of the city, perhaps the most enchanting may count neon lights, but because neon lights are the most vulnerable, we often see that the pictures and text displayed by neon lights are always missing arms. If you use LED instead of neon as a display mark, you can not only avoid the regret of incompleteness, but also achieve the realm of desire.
Initially, LEDs were only used as miniature indicator lights in high-end equipment such as computers, audio and video recorders. With the continuous advancement of large-scale integrated circuits and computer technology, LED displays are rapidly emerging. As a new generation of display media, LEDs have become A beautiful landscape of modern cities, widely used in a variety of public places. In recent years, LED has gradually expanded into the field of general lighting, from securities market to stock machines, from laptops to digital cameras, from PDAs to mobile phones, from indoor lighting to car lights, LEDs are everywhere.
The single element of the organic LED display has a reaction speed of 1000 times that of the LCD Screen. It can also be taken under strong light and is suitable for low temperatures of minus 40 degrees. It is reported that a foreign company is developing a head-mounted viewfinder that puts a high-resolution organic LED display of the size of a fingernail into it. Wearing this translucent helmet display, the pilot can easily view various flight data. The surgeon's eye undergoing surgery can see complex diagnostic images without leaving the operating table; the flight mechanic can see the repair manual for the corresponding part when looking at the aircraft. Even more exciting is that wearing glasses made of organic LED display, you can also enjoy watching movies with a viewing angle of 160 degrees.
LED illuminates the future
In modern cities, light pollution caused by high-power gas discharge lamps, floodlights, neon lights, and light box advertisements has caused serious harm to humans, the natural environment, and astronomical observation. In the 21st century, solving light pollution is an urgent task for lighting technology. LEDs have emerged as the times require, and the future is boundless.
The emergence of white LEDs is a substantial step in the LED's transition from the identification function to the illumination function. White LEDs are closest to daylight and better reflect the true color of the illuminated object. Therefore, from a technical point of view, white LED is undoubtedly the most advanced technology of LED.
The market for white LEDs will be very broad and will be the "killer" to replace incandescent tungsten bulbs and fluorescent lamps. At present, white LEDs have begun to enter some application fields, and products such as emergency lights, flashlights, and flash lamps have been introduced. However, since the price is very expensive, it is difficult to popularize. A set of white LEDs with a brightness equivalent to 40 watts of incandescent lamps, which sell for $220. The premise of the popularity of white LEDs is that the price drops, and the price drop must be formed in a certain market size of white LEDs. There is no doubt that both The integration ultimately depends on technological advancement.
According to the US Department of Energy, around the year of 2010, 55% of incandescent lamps and fluorescent lamps in the United States will be replaced by LEDs. The annual energy saving value will reach 35 billion US dollars, which may form a large industry of 50 billion US dollars. Japan proposed that LED will replace traditional incandescent lamps on a large scale in 2006. In order to seize the commanding heights of the future market, the world's three major lighting industry giants such as General Electric, Philips, and Osram have taken action, and established LED lighting companies in cooperation with semiconductor companies, with the goal of increasing LED luminous efficiency by 8 times by 2010. The price is reduced by 99%.
The battle for the future lighting market has already opened fire. China has a huge lighting industry and lighting market. Last year, China's lighting electrical sales revenue was 44.5 billion yuan, and exports earned 4.3 billion US dollars. Experts estimate that the output value of China's LED industry will reach 3 billion to 4 billion US dollars within 3 years. In the field of semiconductor light-emitting devices, the gap between China and the world's advanced level is small. The first LED independently developed by China is only a few months later than the world's first LED. The overall technical level is only about three years behind that of developed countries. In order to adapt to the high-speed market demand, China has listed LEDs as 31 electronic products encouraged by the state and 20 electronic products and technologies that encourage foreign investment.
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