At the World Expo in Panama in 1915, Chinese Maotai liquor, which went abroad for exhibition, became famous. The broken wine aroma attracted visitors and let people know that it is a Chinese characteristic, which made it famous at home and abroad and achieved its century old national wine brand. The World Expo was earlier called the World Expo, which is a concentrated display of many countries. What's on display? On the one hand is culture, on the other hand is technology.

In the early stage of the World Expo, people showed more items, but this Shanghai World Expo showed more human thinking about the future, including energy crisis, climate issues, sustainable development and so on. From the chip in the Expo ticket to the new energy representative solar energy and energy-saving star led, the author is particularly familiar with various applications using semiconductor technology.

The China National Pavilion, the "Oriental Crown" of the World Expo, has a panoramic view of the core area of the World Expo Park. As a clean energy, solar energy replacing traditional energy will greatly reduce pollution and greenhouse gas emissions. The China Pavilion of this world expo uses solar energy as green energy, and the installed capacity of solar energy can reach 302 kW. According to the architectural design characteristics of the National Pavilion, monocrystalline silicon solar modules are laid on a 68m high platform and a 60m viewing platform.

The blue part on the roof of the theme pavilion is also a solar module, with a laying area of 26000 square meters. The total installed capacity of the photovoltaic power station is 2825 kWp. It will become a large integrated solar photovoltaic power station for single buildings in Asia. The solar panel area is more than 30000 square meters, and the annual power generation is more than 2.8 million kwh, which is the power consumption of nearly 5000 ordinary families in a year. The total installed capacity of solar energy in the whole Expo site can reach 4700 kW.

The PV module roof project of Belgium EU Pavilion is constructed by Changzhou Trina Solar energy. The roof contains about 690 Trina high-quality modules, covering a roof area of 1200 square meters. It is estimated that the power generation can reach 116000 kwh, saving 39 tons of coal and 87 tons of carbon emission every year. In addition to the traditional display of diamonds and chocolates, the Belgian pavilion also displays solar car models. The exquisite flower curtain wall also relies on solar energy to drive the rotation of flowers.

The 17 meter high translucent curtain outside the Swiss National Pavilion is decorated with 10000 Red "small suns". Each "small sun" is a red photosensitive device the size of a disk. Using more advanced solar power generation technology, through the mutual cooperation of solar cells, light sensors and LEDs, light energy is absorbed, stored and converted into electric energy according to the angle and intensity of incident light, It can shine independently and interact with the curtain of the exhibition hall.

From the Beijing Olympic Games to the National Day celebration, and then to the Shanghai World Expo, the application of LED has become more and more extensive and creative with the development of its technology. The Shanghai World Expo has become an integrated platform for relatively new LED technologies. The stage of the opening ceremony is set against the background of a huge LED display wall. The main stand screen is composed of 9 layered and staggered LED displays with a point distance of 6mm, with a total pixel value of 9696 × 1056, covering an area of nearly 372 square meters.

As a new solid-state light source, LED has the characteristics of small volume, low power consumption, long service life, fast response and high reliability. At present, it has been recognized as an important lighting material for energy conservation and environmental protection all over the world. Compared with traditional lighting technology, LED is more energy-saving. Although some led technologies have been adopted at the 2000 Hannover World Expo in Germany and the 2005 Aichi World Expo in Japan, the scope and scale of application are very limited. With the rapid development of LED technology in recent years, LED technology has been applied on a large scale in the Shanghai World Expo Park. 1.03 billion LED chips light up the Expo Park at 7:00 every night. As such a large-scale LED integrated application case in the world, Shanghai World Expo shows the world all kinds of possibilities of LED lighting in the future.

The Chinese Pavilion illuminates the red main structure through high color rendering LED projection lamps, so that the Chinese infrared clothes it wears are particularly eye-catching; The Expo Cultural Center, which looks like, illuminates the side wall and inner wall of the circular window opening through the LED linear projection lamp to produce the effect of internal light transmission, create a sense of the future of space visitors and radiate the light full of vitality of the times; The north and south facades of the Expo theme pavilion are projected by full-color LED linear projection lights to form the spatial rhythm of facade light. The ecological greening wall adopts randomly arranged full-color LED decorative lamps embedded in swaying plants, reflecting the interaction between the Expo and nature.

"Moon boat" Saudi Pavilion, "Purple silkworm island" Japan Pavilion, "British Pavilion with more than 60000 acrylic tentacles, etc. are all equipped with semiconductor lighting facilities. Although the Expo Park has bright lights, the actual power consumption is not too large, which is largely due to the application of LED technology. The landscape lighting of the better practice area of the city and the four pavilions on one axis in the World Expo Park are all led. More than 80% of the night lighting in the whole park is led. It has become a large LED centralized demonstration area in the world, which can save energy by 60%.

At the first World Expo in 1851, the London World Industrial Expo, the brilliant achievements of the industrial revolution were displayed. At the Paris World Expo, Napoleon specially displayed Bordeaux wine. Since then, France has become the wine center of the world. The Eiffel Tower has become a landmark of France since then. The 1970 Osaka World Expo demonstrated Japan's scientific and technological achievements. Since then, Japan's economy has experienced 20 years of rapid development. Perhaps one of the achievements of the Shanghai World Expo is to make people realize that new energy and energy-saving technologies will shine in the future and become a new driving force for economic development.