Backlights, displays, and lighting are currently the three largest and most promising applications for LEDs. Different markets have different needs. In which areas of LED technology will be developed in different applications? What attributes should the company focus on to improve its products? "China Electronics News" interviewed well-known experts in the industry and representatives of leading enterprises to interpret the development trend of LED technology in different application fields.
The data shows that the scale of China's LED display application industry is generally stable, and the number of enterprises with LED display as the main business in the country is around 400. In 2012, the national LED display market sales totaled 25.3 billion yuan, an increase of 15% over 2011; in 2013, the national LED display application industry market growth rate was about 10% to 15%, the total market is 28 billion yuan about.
"The development of LED display application market has entered a relatively stable period." Guan Jizhen, vice chairman of China Optical Optoelectronics Industry Association and director of LED Display Application Industry Association, said in an interview with China Electronics News that "the LED display technology level At the moment of continuous improvement, innovation will become an important manifestation of the competitive advantage of the enterprise market."
Machine: Technology level and international synchronization
"At present, the overall technical level of China's LED display application is basically synchronized with the international development, and it is at the international leading level in some key technical fields and special engineering applications." Guan Jizhen said, "Innovative products are new, especially with small dots. High-density LED display products, new LED curtain wall display products, and professional control boards and control systems are prominent."
Guan Jizhen told reporters that from the perspective of overall technological innovation, some key enterprises actively undertake various scientific and technological projects and are supported by the National Development and Reform Commission's special energy conservation and industrialization projects; the overall technological innovation direction of the industry is mainly concentrated on large-screen control and high density. It shows new product development, special project engineering design, LED display application expansion products, product reliability, energy saving, etc. In the field of traditional LED display, various indoor and outdoor LED display key technologies are basically mature, and the whole product is reliable. Continuous improvement and improvement in terms of sex and craftsmanship have resulted in the formation of standardized series of products; full-color indoor and outdoor displays have been widely used, and outdoor high-definition full-color surface-mounting technology products have become increasingly mature.
So for the LED display industry, how is the next step in technology development? “It is necessary to improve product quality as a breakthrough in technological innovation.†Jiang Fengyi, vice president of Nanchang University and director of the National Silicon-based LED Engineering Technology Research Center, told the China Electronics News.
Jiang Fengyi suggested developing and applying reverse polarity LED chips, reducing operating current density, improving luminous efficiency, improving reliability, and making the display more energy efficient. The application of reverse polarity red LED can greatly improve the luminous efficiency; the red LED reduces its working current density, which can significantly improve its reliability; and the green LED reduces its working current density, and can also significantly improve its luminous efficiency. At the same time, high-quality LED displays such as monochrome screens of various colors and multi-combination two-color screens can be developed.
“These technological innovations are inseparable from the close cooperation between the upper, middle and lower reaches.†Jiang Fengyi said, “The key to promoting LED application in the joint innovation of the industry chain is to avoid overloading the chip, work with a smaller current density, and properly use the chip to reduce the The demanding requirements of power supply and heat dissipation further improve the luminous efficiency and reliability of LED application products while maintaining the total manufacturing cost unchanged or little change."
Chip: "four high" corresponds to more requirements
So, what kind of LED display is really a high-quality display? "I think it is mainly reflected in six aspects." Jiang Zhongyong, general manager of Hangzhou Silan Mingxin Technology Co., Ltd. told the China Electronics News reporter, "One is that the LED display has good uniformity, that is, the brightness and color uniformity are good; the second is The display does not have dead lights or few dead lights; the third is good low-gradation uniformity; the fourth is that after long-term use, the above indicators change little; the fifth is that the brightness of the light-emitting tube is high, and the power is saved; the sixth is that the surface is flat.)
Brightness improvement is an eternal issue in LED chip manufacturing. In addition, as one of the leading factors determining the quality of LED display, what are the specific effects of the technical level of the chip on the quality of the display? Jiang Zhongyong said that the specifications of the chip determine the specifications of the package, and the requirements for uniformity are increasing. The level of electrostatic protection of the chip is inseparable from the long-term stable operation of the display; the more consistent the junction capacitance of the chip, the better the uniformity of low gray scale; The chip also determines the proportion and level of small leakage of the LED display.
Specific to the indoor display, the "four high" attribute of the high-quality LED display puts specific requirements on the chip. Dr. Wang Jiangbo from R&D Department of Huacan Optoelectronics Co., Ltd. said in an interview with China Electronics News that the first is “high densityâ€, the chips are getting smaller and smaller, and the requirements for consistency are getting higher and higher, but for single chips. The brightness requirement is lower; the second is "high scan". The higher the scan frequency, the longer the chip is in the back pressure state, the corresponding chip performance must also be improved; again the "high refresh", the higher the refresh frequency, The higher the tolerance of the chip under high-frequency pulse current; the last is "high gray scale", which requires the chip to have better wavelength and brightness uniformity under various currents.
"For outdoor displays, from the straight tube to the 3535 surface mount, the chip requires better light consistency, higher brightness, better moisture and moisture resistance." Wang Jiangbo stressed.
Devices: Five trends lead technology development
LED display devices are another dominant factor in determining the quality of LED displays. "At present, five trends are leading the development of industry technology." Li Mantie, chairman and president of Shenzhen Lehman Optoelectronics Technology Co., Ltd., said in an interview with China Electronics News.
Increasing operating costs are the constant pursuit of LED display operators. “The first trend is that the brightness of LED devices continues to increase, and the power consumption of display screens continues to drop.†Li Mantie said, “The only way to continue to reduce the operating costs of LED displays.â€
The light pollution that is everywhere can already affect the lives of ordinary people. After last year Shanghai introduced the mandatory standard for brightness limit of LED display in public places, from May 1 this year, from 22:30 to 7:30 the next day, Guangzhou's outdoor LED electronic display was required shut down. "The management of light pollution of LED displays has gradually formed a consensus, so the second trend is that LED devices must reduce light pollution." Li Mantie said.
The third trend is that surface mount devices are moving from indoors to outdoors. "Through the continuous exploration of mechanics, thermals, materials science, optics and other comprehensive disciplines, the reliability of outdoor application of surface mount devices has been greatly improved. The waterproof, moisture-proof and anti-UV properties have been able to meet the needs of outdoor applications." Li Man-tie said "At present, the technology of surface mount devices moving from indoors to outdoors has become more mature."
"Users' pursuit of outdoor HD display is endless, and LED high-definition display records are constantly being refreshed." Li Man-tie said, "LED screen dot spacing is getting smaller and smaller, device size is getting smaller and smaller, this is the fourth. A trend."
The last development trend is reflected in the display effect of the screen. “The industry has greatly improved the display performance of LED devices by adopting the technology of improving the contrast of surface mount devices and the matte matte technology.†Li Mantie said, “But with the increasing demand for display quality in the market, LEDs The device should also meet the higher requirements for picture quality."
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