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At present, the dividend ceiling of smart phones is gradually emerging, especially the competition in the Chinese market is particularly fierce. In January, Huawei's sales were 4.72 million units, a slight decrease of 0.4%, and sales were 10.89 billion yuan, a decrease of 1.5%.

There are many forms of matter, such as solid, liquid, gas, plasma and so on. We usually call materials with poor conductivity, such as coal, artificial crystal, amber, ceramics and so on, insulators. Metals with good conductivity, such as gold, silver, copper, iron, tin and aluminum, are called conductors. The material between conductor and insulator can be simply called semiconductor. Compared with conductors and insulators, the discovery of semiconductor materials is the latest. Until the 1930s, when the purification technology of materials was improved, the existence of semiconductors was really recognized by the academic community.

At present, the commonly used LED aluminum substrate has two sides: the white side is used for welding led pins, and the other side shows the natural color of aluminum.

At present, most of the holes drilled in the double-sided flexible printed board are still drilled by the NC drilling machine. The NC drilling machine is basically the same as that used in the rigid printed board, but the drilling conditions are different. Because the flexible printed board is very thin, multiple pieces can be overlapped for drilling. If the drilling conditions are good, 10 ~ 15 pieces can be overlapped for drilling.

The concept of integrated circuits traces its roots back to the late 1950s and early 1960s. Jack Kilby, an engineer at Texas Instruments, and Robert Noyce, co-founder of Fairchild Semiconductor and later Intel, independently conceived the idea of integrating multiple electronic components onto a single semiconductor substrate.

The development history of electronic components is actually a condensed history of electronic development. Electronic technology is an emerging technology developed at the end of the 19th century and the beginning of the 20th century. It has developed most rapidly and widely used in the 20th century, and has become an important symbol of the development of modern science and technology.