In recent years, in large-scale shopping malls or activities, we always see the figure of "LED fan". Its appearance is similar to the fan, but it can display various patterns when rotating, and some can display dynamic 3D patterns, which is very cool. Every time we see it, we can always make people stop and watch it, which plays a very good role in publicity and promotion. So how do LED fans display patterns?
Strictly speaking, this so-called "fan" is just a vivid way to call it. In fact, it is a kind of "rotating LED light bar", and its professional name is holographic 3D smart glare screen. After power on, the "fan blade" starts to rotate, which can present a 3D image at the same time, cool and lifelike. At the same time, according to the size and color of the pattern, the LED fan can well hide its leaves, because there is no frame and no fixed screen, so the dynamic picture is like floating in the air, very realistic.
The 3D smart screen not only uses the hardware of rotating LED, but also uses the visual persistence of human eyes. For the hardware equipment of rotating LED, simply speaking, it is to calculate the change frequency of LED light according to the rotation speed of "fan blade". When different LED lights are lit at different times, different patterns will appear. The so-called visual persistence refers to that when the human eye is observing the scene, the light signal is transmitted to the brain nerve, which takes a short period of time. After the end of the role of light, the visual image does not disappear immediately, and the human eye can still maintain its image for about 0.1-0.4 seconds. This kind of residual vision is called "afterimage". The visual phenomenon is called "visual persistence", and the single product can be unique. Vertical display effect can also display the overall effect in combination.
3D holographic fan screen application: shopping malls, brand stores, stores, airports, etc. A good choice to reflect brand effect and brand grade
Principle of 3D holographic screen: Generally speaking, one or more strings of LED lights are arranged on the fan blades. Here, it is assumed that there are 20 LED lights, which are numbered 1-20 at a time from the axis to the edge of the fan blades. In order to explain the principle briefly, we assume that when the fan speed is 60 laps per minute (in reality, the speed is much higher), the human eye will have visual persistence. Let's assume that the LED light is 0 degrees above the fan in 0 seconds. If you want to display the effect of 6:00 on the fan, the minute hand needs to point to the top and the hour hand needs to point to the bottom. It is necessary to turn on the number 1-20 to display minute hand in 0 second, turn on the number 1-10 to display hour hand in 0.5 second, turn on the number 1-20 to display minute hand in 1 second, turn on the number 1-10 to display hour hand in 1.5 second, and so on, so that the human eye will receive a complete picture of the clock at 6:00. For complex patterns, LED fans will have more complex structure and programming equipment. Through the combination of LED light bar rotation and visual persistence, people will see a dynamic 3D picture of the rotating LED fan.
3D holographic fan screen structure: the screen body mainly has light bars and, according to different ones, some have two. Add rotary motor, built-in 3D holographic system and information receiving system.
At present, the main application of 3D smart screen is advertising. Because of its editability and realistic display effect, it is believed that in the near future, it will be applied in more fields.
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As a national key support, fostering the development of strategic emerging industries - LED lighting is the application of a new generation of lighting revolutionary technology, with energy saving, environmental protection, high efficiency, etc., especially in today's traditional energy, environmental pollution and other factors, LED lighting The industry has undoubtedly become the focus of key projects of national and social concern.
Why do LED industry in Europe and America lead?
Under the tremendous pressure of global environmental protection and energy crisis, semiconductor lighting has been recognized as an important way for health, energy conservation and environmental protection. Governments have actively given policy and financial support to enable their enterprises to achieve technological breakthroughs and accelerate the commercialization of LEDs.
Japan established the "21st Century Light Plan" as early as 1998, and invested 5 billion yen in the development of white semiconductor lighting LEDs and new semiconductor materials, substrates, phosphors and lighting fixtures between 1998 and 2002. According to the relevant policies issued by the Japanese government, incandescent light bulbs must be withdrawn from the market before 2012, and the consumption of LED lighting will increase by more than 200% annually. In addition, the Japanese government also clearly stipulates that enterprises or institutions use LED lighting devices to replace incandescent lighting devices between 2006 and 2007, and can obtain 130% excess depreciation of investment amount, or a tax rate reduction of 7% of investment amount.
The support of the LED industry in Europe and the United States is not small. The European Union launched the "High Brightness Organic Light Emitting Diode Project for ICT and Lighting Equipment" with an investment of 20 million Euros to effectively improve the luminous efficiency of organic light-emitting diodes. At the same time, it also carried out a comprehensive ban on the production and sale of incandescent lamps, fluorescent lamps and energy-saving lamps in the Union countries, and promoted the development of application of LED lighting technology.
In 2002, the US federal government launched the National Semiconductor Lighting Research Program and incorporated the Energy Act. Enterprises can obtain financial support of 50 million US dollars per year and support financial funds of 500 million US dollars in 10 years. The US Congress's funding for LED lighting projects rose from $3 million in 2003 to $30 million in 2007, and funding continued to rise in 2009 and 2010. In 2011 and 2012, according to the economic stimulus plan, the US Congress increased the research and development expenses for LED lighting by 50 million US dollars and 37.8 million US dollars respectively, making the total funding for the two years close to 140 million US dollars.
With the support of policies and funds, Japan is already the largest producer of the global LED industry, and its development trend is almost a compass for the development of the global LED industry, while the United States and Europe have leading advantages in upstream epitaxy and chip core technology.
Policy to help China's LED shift speed
Since China started late in the LED industry and was monopolized by foreign countries on the basis of LED core technology and patents, the development is relatively slow. However, with the support of the national and local LED industry, China's LED industry has begun to fully enter the development period. .
According to the survey, China has issued a number of policies to support and encourage the development of the LED industry since 2009. In April 2009, the Ministry of Science and Technology issued the “Response to the Pilot Work on the Implementation of the “Ten Cities and Ten Thousand†Body Lighting Application Projectâ€. According to the plan of the Ministry of Science and Technology, 2 million LED street lights will be built in 50 cities. In September of the same year, the National Development and Reform Commission and the Ministry of Science and Technology and other six ministries and commissions issued the "Opinions on the Development of Semiconductor Lighting Energy-Saving Industry", which suggested that large-scale MOCVD equipment, key raw materials and more than 70% of the chips will be localized, and upstream chip scale production enterprises 3 Up to 5; the concentration of industry is significantly improved, and there are about 10 leading enterprises with independent brands and large market influence; the semiconductor lighting standard system is initially established; by 2015, the average annual growth rate is about 30%, functional lighting The market share is about 20%; the LCD backlight reaches more than 50%, and the market share of landscape decoration and other products reaches over 70%.
In February 2013, the National Development and Reform Commission, the Ministry of Science and Technology and other six ministries and commissions issued the "Semiconductor Lighting Energy Conservation Industry Plan", the planning goal is: LED chip localization rate of more than 80%, silicon-based LED chips have made important breakthroughs. The luminous efficiency of the core device and the quality of the applied products have reached the international advanced level; the large-scale MOCVD equipment and key raw materials have been localized, and the localization rate of testing equipment has reached more than 70%. Establish a world-class R & D, testing platform and standards, certification system; by 2015, more than 60W of ordinary lighting incandescent lamps will be eliminated, the market share will fall below 10%, LED functional lighting products market share of 20 More than %; LED lighting energy-saving industry output value increased by about 30% per year, reaching 450 billion yuan in 2015 (including 180 billion LED lighting application products; forming 10-15 core technologies, with more independent intellectual property rights and well-known brands, Leading LED company with strong quality competitiveness.
At the same time, many provinces in China have put forward the "local version" of the LED industry development policy based on the demand for energy conservation and environmental protection. In April 2011, the Guangdong Provincial Department of Science and Technology released the “Twelfth Five-Year Plan for the Development of LED Industry in Guangdong Provinceâ€. The plan proposes to raise 1 to 2 leading enterprises with an output value of 10 billion yuan by 2015 and cultivate 1 to 2 An industrial cluster with an output value of 100 billion yuan, the province's LED strategic emerging industry scale exceeded 300 billion yuan.
In 2009, Yangzhou City proposed to subsidize the purchase of LEDs. Among them, the blue-green MOCVD31 machine and above, the subsidy fund can reach 10 million yuan / Taiwan; the red and yellow light MOCVD38 tablet machine and above, the subsidy fund can reach 8 million yuan / Taiwan (the city, district and finance finances each bear 50%) ). According to estimates, Yangzhou Guang invested 1 billion yuan in the field of equipment subsidies.
In terms of product application, Shenzhen City proposed that for enterprises participating in the LED demonstration project of government investment projects, 10% subsidy will be given according to the price of the lamps, and the interest will be discounted for 3 years. For enterprises that undertake LED application demonstration projects for enterprise investment projects, subsidies are given in accordance with 30% of the price of LED lamps.
The industry analysts believe that with the support of national policies, the promotion of financial subsidies and the implementation of measures such as LED lighting by the state and local governments, this has played a guiding role in the development of LED enterprises, and at the same time, the enterprises are in technology through financial support. Breakthroughs will enable enterprises to face market competition with greater confidence and accelerate the internationalization of China's LED industry.
Technological breakthroughs narrow the gap
The continuous release of national preferential policies and the support of funds and subsidies at the same time demonstrate the determination of the country to develop strategic emerging industries that are energy-saving and environmentally friendly. Under the active promotion of the government, Chinese LED companies are committed to technological innovation, creation, and continuous improvement of research and development capabilities, and actively through vertical integration, extending the industrial chain, developing industrial clusters, and gradually narrowing the gap with the world's traditional LED giants.
China's LED epitaxial materials, chip manufacturing, device packaging, phosphors and other aspects have shown unit technology with independent technology property rights, some core technologies are original, initially formed from upstream materials, midstream chip preparation, downstream device packaging and integration applications The relatively complete R&D and industrial system has laid a foundation for the expansion of China's LED industry to a certain extent. At present, the 863 project undertaker has applied for 241 patents, including 152 invention patents and 17 foreign invention patents.
A major breakthrough has been made in the key technologies of industrialization. Power-type chips have grown from scratch, and the proportion of domestically produced chips replacing imports has increased year by year, reaching 46% so far. The power type white LED package is close to the international advanced level and has become an important LED packaging base in the world. The company's 100 lumens/watt LED manufacturing technology is progressing rapidly, and the better results achieved on the industrialization line are close to 70 lumens/watt. The power type silicon substrate LED chip with independent intellectual property rights has a white light efficiency of more than 50 lm/W.
The research and major applications of large-scale system integration technology are progressing smoothly. The product range and scale of application products are at the forefront of the world, and it has become the largest producer and exporter of LED full-Color Display, solar LED, landscape lighting and other application products. In July 2008, Hisense's first 42-inch ultra-thin LED-backlit LCD TV was officially launched, breaking the monopoly of foreign manufacturers, indicating that China's consumer electronics products, which account for 40% of world production, began to use LED technology on a large scale. In 2012, the output value of China's semiconductor lighting industry has exceeded 180 billion yuan. 
Recently, the National Development and Reform Commission and other six ministries and commissions jointly issued the "Semiconductor Lighting Energy Conservation Industry Plan", further clearly expounding the development goals, main tasks and supporting measures of China's LED industry during the "Twelfth Five-Year Plan" period, and clearly promoting the LED lighting energy-saving industrial value. The average annual growth rate is about 30%. In 2015, it reached 450 billion yuan, of which LED industry application products reached 180 billion yuan.