Text / Gaogong LED Editor Zeng Hongping
Compared with other display products, LED display has the advantages of clear image, bright color, good stability, high brightness, high luminous efficiency, long life and low power consumption. In addition, LED display is not limited by space and can be designed according to user requirements. The size of the screen, representing text, graphics, images. At present, LEDs are developing towards higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, and full colorization. Nowadays, the global LED large-screen industry and China's LED large-screen industry are in a stage of rapid growth. Especially in recent years, driven by the trend of energy saving and consumption reduction, LED technology has been widely used, and the market capacity will maintain a growth rate of about 15% per year.
After nearly ten years of development, the development of China's LED display industry has begun to take shape, basically forming a number of key enterprises with a certain scale. In 2008, the LED display market was about 10 billion yuan. In 2009, China's LED display performance was remarkable. Of course, compared with the 2008 financial crisis, China's LED display screen grew significantly faster in 2008 than in 2008. If China's entire economy can recover in 2010, then the growth of the led display market will begin to recover next year. From 2008 to 2013, the compound annual growth rate is expected to be 19.3%. In 2013, the led display market will reach 12.4 billion US dollars. With the hosting and preparation of major events such as the Beijing Olympic Games, the Shanghai World Expo, and the Guangzhou Asian Games, the large-scale application of stadiums, machine-taste stations, banks, hospitals, public-wide commercial sites, and residential communities, the market application space of LED displays growing.
Beginning to form a supporting industrial chain
The LED display industry belongs to the electronic equipment manufacturing industry. Most of the early companies were founded by scientific research institutes and scientific and technological personnel in colleges and universities. The company chose to use LEDs and electronic components to develop, design and produce LED displays. From the development of control systems, the design of molded shell molds and cabinets, to the processing and production of semi-finished products by themselves, it is a typical Chinese-style self-sufficient production model. In recent years, with the development of the industry, the industry has gradually formed an obvious division of labor, and has specialized in producing LEDs, switching power supplies, integrated circuits, molded cases and chassis parts for display; system development with professional R&D control systems. Business; there are professional production modules, module processing enterprises. Many small companies in the early days of the industry have evolved into non-productive companies such as LED display sales, installation, and repair services.
The formation of the industrial chain has promoted the development of the industry. Firstly, the promotion of LED display screens has been popularized. As long as the corresponding components are purchased, it is easy to assemble into a display screen, which has cultivated many sales-oriented enterprises. Secondly, the production cost is greatly reduced, and the display is high due to the high labor productivity of professional production. In the case of domestic production materials and labor productivity, the price is still falling. Third, the quality of the display has been greatly improved. Due to professional production, the quality of the products has changed greatly from the earlier workshop-type production, especially The formation of professional control system developers has made the domestic small enterprise's control system level have a big leap. At the same time, the formation of the industrial chain has also brought negative impacts on the industry. The industrial chain makes it easy for small businesses to form, and the increase in small businesses has intensified competition in the industry. Many small and medium-sized enterprises participate in the industrial chain, stop their own product research and development, make the general product technology in the industry similar, quality homogenization, products have no features, but the formation of LED display industry chain is the market needs, and will get further Development and improvement.
      The gap between technology and foreign display technology is shrinking
The display, especially the outdoor screen, is subject to wind, sun, rain, high and low temperatures, so its reliability is particularly important. In the past, domestic display manufacturers used more foreign devices, and the use of domestic devices is gradually increasing. As long as the performance of domestic devices can meet the requirements, we will first choose domestic devices. In recent years, the development of China's LED display industry has been characterized by younger employees, fast industry growth and strong technological innovation capabilities. It is precisely because of the continuous improvement of the technical innovation ability of practitioners that the domestic LED display technology is also making continuous progress.
Judging from the current market situation, the usage and use of domestic chips and devices are still very good, especially in the market for indoor screens. "The right is the best", blind pursuit of high-end is not conducive to the promotion and application of LED. Optimizing from a system perspective, while choosing a cost-effective solution, can greatly reduce the cost of LED products, on the other hand, it is also very beneficial to promote the use of domestic chips and devices. From the technical point of view and the effect of use, foreign products are relatively good, and high-end projects naturally use foreign products. However, we should see that the progress of domestic chip and packaging technology is also very rapid, and the leading edge of foreign technology is getting more and more. China's LED display private industry is developing at the same time, while product technology is innovating and has maintained a relatively advanced level. In the early 1990s, it has mature 16-level grayscale 256-color video control technology and wireless remote control and other international advanced level technologies. In recent years, it has full-color LED display, 256-level grayscale video control technology, cluster wireless control, multi-level group control. Technology and other aspects have advanced domestic and international technology and products; large-scale integrated circuits for LED display control have also been developed and produced by domestic enterprises.
Full color display will become a new growth point
As the performance of LED device materials continues to increase, the cost of full-color displays decreases, and applications increase. By the end of 2003, there were more than 600 full-color LED displays nationwide. In terms of the comprehensive level of full-color display, in addition to the advantages of price and localization services, the domestic full-color LED display is gradually shrinking from the gaps in technology depth and production technology with SMD surface-mount technology. The indoor full-color LED display has been rapidly developed and will become the leading development product for indoor display in the future. The full-color LED display will be an important development direction for LED displays and display devices. It is expected that in the next few years, full-color LED displays will increasingly replace traditional light boxes, neon lights, magnetic flaps and other products in outdoor advertising media, and the full-color LED screens of stadiums will become more Mainstream products.
With the increasing recognition of LED full-color display market, the market demand shows a trend of rapid growth. In 2008, the market size of LED full-color display has exceeded 4.85 billion yuan, 46% of the entire LED display industry, including domestic manufacturers. LED full color display accounts for more than 80%. At present, the products are mainly used in advertising, broadcasting, sports venues and other fields. The market demand will remain strong in the future, but with the development of the market, the market will develop in the direction of product standardization and market standardization. The wide application of full-color LED display will be a new growth point for the development of LED display industry.
Product structure presents a diversified trend
With the continuous changes in market demand, continuous advancement of technology, and the introduction of national standards, LED display products are developing towards diversification, standardization, standardization, and high brightness. It is expected that the mainstream product situation of large or super large LED display will change, suitable for the service industry characteristics and professionalism to show that the small LED display will be greatly improved, and the LED display product category and variety system for information service field It will be more abundant, and some potential market demands and application fields will be broken. The demand for information display such as public transportation, parking and catering, hospitals and other comprehensive services will be greatly improved, and large-scale and miniaturized. The standard series of LED displays will account for the majority of the total LED display market.
The promotion and implementation of relevant standards will promote the standardization of LED display products. Among the conventional LED display products, standardized display devices and control systems will be more widely adopted. Integrated LED display products will occupy a major position in the industry. The specialized division of production of standardized LED display products and market technical services will be More obvious. In the professional application field, LED display products meet the needs of professional applications, the level of specialization will continue to improve, and specialized products combined with application requirements will expand into new products and new application fields that form LED displays, such as the large-scale urban lighting project. Area LED display, LED display of stadiums, LED display in traffic field, etc.
Display calibration technology is the key to ensuring quality
All along, the characteristics of LEDs are very different due to manufacturing processes, etc. When integrating the display modules made of these LEDs into LED displays, if there is no sufficient compensation for these differences, it will lead to LED display. The difference in brightness and color is clearly visible; at the same time, after the LED display is installed for a period of time, the brightness and chromaticity of the LED will change with time, but the degree of attenuation of each LED is different, which will lead to LED display. The visual quality of the screen is greatly reduced; in addition, the replacement of the damaged LED module during the use of the LED display causes the new module to be mismatched with the entire screen, which will greatly reduce the visual quality of the LED display.
At present, the number of LED display screens is relatively large, and its technology is relatively mature. The structure and principle of the display screens manufactured by various enterprises are basically similar. How to improve the technical performance of the display screen and reduce the cost is the key to competition among enterprises. Now, the prices of LED displays sold on the market are basically the same. However, the quality of displays produced by different companies is different. The reasons are various, including the quality, brightness, brightness uniformity, packaging, etc. of LED display modules. The difference in technology, the way data is transmitted, the difference in anti-interference ability, and the difference in control circuits, and the correction of LED displays can effectively help companies solve these problems. At present, there are still few companies using LED display correction technology, but as the industry demands for high-quality display screens, LED display correction technology will be greatly promoted and eventually become a key technology to ensure quality. one.
Suggestions for accelerating the development of LED display in China
Although China's LED display industry is developing rapidly, there is a certain gap between the technical level and manufacturing technology level in the industry and the international advanced level. The main reason is that most enterprises lack the core technology and industrialization scale with independent intellectual property rights. LED light-emitting tubes (dies) are imported, and most of the display products are mainly medium and low-grade. Small and medium-sized enterprises, especially small enterprises, account for a large proportion, and domestic LED display exports are mainly competitive with price advantage.
In order to accelerate the development of China's LED display industry, the following suggestions are proposed: (1) It is necessary to strengthen communication with the government and strive to increase government support for industries and enterprises; (2) Strengthen the construction of industry standards and improve the "General Specifications" ", formulate corresponding technical standards, and establish a scientific basis for judging quality; (3) Enterprises should strengthen cooperation with upstream and downstream, make full use of existing scientific research results to accelerate the display of technological progress in the industry; (4) Enterprises must increase investment in technological innovation To enable enterprises to continuously form new technological innovations and product innovations, thus creating new economic growth points.
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Conclusion
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In the new century, the optoelectronics industry has received extensive attention from the society. The display products and technologies as the human-machine information visual communication media have developed rapidly. The display technology entering the 21st century will be the era of flat panel display. The LED display is used as a flat panel display. One of the leading products will undoubtedly have greater development and will become a representative mainstream product for flat panel display in the next five years. Indoor and outdoor (including tunnel) large-screen LED display is currently a lucrative niche market. In addition to large stadiums, it is also widely used in highway toll stations, highway signage, airport flight information display, terminals, ports, trains. Stations, tunnels, game consoles, cities, outdoor billboards, government offices and parking lots are used to display some dynamic information in real time. With the formation of product standard systems and the implementation of series standards, the LED display industry is developing in a healthy and orderly direction.
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