LED applications are divided into two categories: display and illumination. A new type of illumination using light-emitting diodes (LEDs) as a light source is called semiconductor illumination , referred to as LED illumination. The industry dominated by semiconductor illumination is called the LED lighting industry. The LED lighting industry chain includes upstream raw materials, equipment (single chip) and epitaxial growth; midstream chip manufacturing; downstream packaging and product development, production and application; supporting industries including related equipment, accessories, materials, etc. The upstream link has high technical content, large capital investment, large quality impact, high profit margin, LED luminous color and luminous efficiency are related to the materials and processes for making LED, and upstream accounts for about 70% of LED manufacturing cost, which is extremely important for the LED industry; It is a technology- and capital-intensive link. The chip is currently the most competitive part of patent competition. It has the characteristics of large investment intensity but slow effect. The downstream links include the development and production of LED packages and lamps, which are the most closely related links to the market. The relatively low content and low investment threshold are the largest and fastest growing areas in the LED industry.
International LED lighting industry status
The LED lighting industry is in a period of rapid development. At present, the global LED industry can be divided into four regions. First, in Europe and the United States, the general lighting is the main direction, emphasizing the high reliability and high brightness of the products. Second, Japan is the most comprehensive technology. Whether it is general lighting or backlit display, it has strong strength, and its development direction takes into account general lighting, automobiles, mobile phones and television. Third, South Korea and Taiwan, with notebook display backlighting, LED-TV backlighting and mobile phone backlight as the main direction, with large shipments, low unit prices and low gross profit. Fourth, the mainland of China, focusing on yellow-green light, focuses on outdoor display, advertising screens, and signal lights.
Under the dual pull of domestic industrial policies and international market demand, China's LED lighting products market is also accelerating. At present, global LED production capacity is shifting to China. About 50% of global LED packaging and more than 60% of LED applications are in China. China has become the fastest growing region in the global semiconductor lighting industry.
China's LED lighting industry development policy
With the inherent advantages of energy saving and environmental protection, the LED industry has become a powerful engine to start the green lighting revolution. It is known as the “golden intersection of new light source and new energy†and continues to be supported by the state and local governments at all levels. At the beginning of 2006, the State Council issued the "National Medium- and Long-Term Science and Technology Development Plan", and listed "high-efficiency, energy-saving, long-life semiconductor lighting products" as the first priority theme (industrial energy-saving) in the first key areas of energy management (energy). In the same year, the national "Eleventh Five-Year" 863 Program "Semiconductor Lighting Project" major project was officially launched. On January 10, 2008, the Ministry of Finance and the National Development and Reform Commission (hereinafter referred to as the “National Development and Reform Commission†jointly issued the “Interim Measures for the Management of Financial Subsidy Funds for Efficient Lighting Products Promotion†to promote the rapid development of the LED industry. On November 4, 2011, the "Notice on the gradual ban on the import and sale of ordinary lighting incandescent lamps" issued by the National Development and Reform Commission and the five ministries and commissions clearly stated that the incandescent lamps will be phased out and planned to be October 1, 2016. Incandescent lamps will completely withdraw from the market. The National Development and Reform Commission also organized the drafting of the “Twelfth Five-Year Plan†for the semiconductor lighting industry, and will work with the Ministry of Finance to study and formulate measures to encourage LED promotion. The promulgation and implementation of this measure will greatly promote the lighting industry in China.
At the same time, in the context of the “Twelfth Five-Year Plan†for energy conservation and emission reduction, the Chinese government has also issued a series of incentive policies for public lighting, accelerating the pace of environmental protection, energy conservation and emission reduction in China, expanding the domestic demand for LED products , and accelerating the promotion of LED lighting products. Application area. It includes related system projects such as “Ten Cities and Ten Thousand Milesâ€, “Thousands of Miles†and “Green Lighting City†to promote the recognition of LED lighting products and create a good market space for them.
With the further development of LED's role in energy conservation and emission reduction, the transformation of related industries, and the transformation of economic development mode, China is expected to introduce more powerful LED industry development promotion measures, and its policy space and market space have great potential for improvement. .
China's LED lighting industry standardization status
After several years of development, China's LED industry has basically formed a relatively complete industrial chain. At the same time, the development of LED lighting standards and the establishment of a standard system have entered a stage of rapid development. At present, the domestic standard projects involving LED and semiconductor lighting have basically covered all links of epitaxial chips, packaged devices, product applications, test equipment and other industrial chains.
Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.
In addition to SCSI, IDE is also a very common interface. From the point of view of ease of use, IDE is more suitable for ordinary users. In addition, personal computer users not only need to configure a few peripherals, but also do not require high speed. Therefore, it is more appropriate to choose IDE interface. In addition, IDE also has the characteristics of high performance price ratio and wide application. Although the SCSI interface has many incomparable characteristics, the price of the interface and its peripherals is too expensive to be borne by ordinary users, which determines the limitation of its actual use range.
1. The working mode of IDE requires the whole process participation of CPU. When the CPU reads and writes data, it can't perform other operations. In this case, in the multitask operating system of Windows 95 / NT, the system reaction will be greatly slowed down. The SCSI interface controls the data reading and writing operation completely through the independent high-speed SCSI card, so the CPU does not have to waste time to wait, which obviously can improve the overall performance of the system. However, IDE interface has also made great improvements to improve this problem. DMA mode can be used instead of PIO mode to read and write data. DMA channel is responsible for data exchange, which greatly reduces the CPU consumption. However, comparing the CPU utilization of SCSI and IDE, we can find that SCSI still has considerable advantages.
2. The scalability of SCSI is larger than that of IDE. Generally, each ide system can have two IDE channels, with a total of four IDE devices. The SCSI interface can connect 7-15 devices, much more than IDE, and the cable connected is far longer than ide.
3. Although the price of SCSI device is higher, compared with IDE, the performance of SCSI is more stable, durable and reliable.
SCSI Solder Type Section
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