Backlight, display, lighting LED is currently the three largest and most promising application market. Different markets, different needs. In different areas of application, LED technology will be in which direction? What should enterprises do to improve the attributes of the product? "China Electronics News" interviewed the industry well-known experts and leading enterprises on behalf of the different application areas of LED technology development trends to interpret.
Data show that China's LED display application industry scale overall stability, the country to LED display for the main business of the number of enterprises in the 400 or so. 2012, the national LED display market sales amounted to 25.3 billion yuan, an increase of 15% over 2011; 2013, the national LED display application industry market size increase of about 10% to 15%, the total market in 28 billion yuan about.
"LED display application market development has entered a relatively stable period." China Optical Optoelectronics Industry Association vice president, LED display application industry association director Guan Jizhen in the "China Electronics News" reporter said, "in the LED display technology level Constantly improving the moment, innovation will become an important manifestation of the competitive advantage of the enterprise market.
Machine: technical level and international synchronization
"At present, China's LED display application of the overall level of technology with the international development of the basic, in some key technical areas and special engineering applications is living in the international leading level." Guan Jizhen said, "innovative products innovation, especially in small points High - density LED display products, new LED curtain wall display products and professional control boards, control systems, such as prominent.
Guanji Zhen told reporters, from the overall situation of technological innovation, some of the backbone enterprises to actively assume all kinds of science and technology projects, and the National Development and Reform Commission of special energy-saving, industrial special support; industry as a whole technology innovation focused on large-screen control, high-density Display new product development, special project engineering design, LED display application development products and product reliability, energy saving, etc .; in the traditional LED display field, a variety of indoor and outdoor LED display key technology is basically mature, the whole product in a reliable And the level of technology and continuous improvement and improvement, the formation of a standardized series of products; full-color indoor and outdoor display has been widely used, outdoor high-definition full-color stickers technology products become more mature.
So for the LED display industry, the next step in how the direction of technology development? "Must improve product quality as a breakthrough in technological innovation." Nanchang University Vice President, National Silicon-based LED Engineering Technology Research Center Director Jiang Fengyi told the "China Electronics News" reporter.
Jiang Fengyi proposed the development and application of reverse polarity LED chip, and reduce the working current density, improve luminous efficiency, improve reliability, make the display more energy efficient. Application of reverse polarity red LED can greatly enhance the luminous efficiency; red LED to reduce its working current density, can significantly improve its reliability; green LED to reduce its working current density, can significantly improve its luminous efficiency. At the same time, you can develop a variety of colors and multi-color combination of two-color screen and other high-quality LED display.
"These technological innovations can not be separated from the middle and lower reaches of the close cooperation." Jiang Fengyi said, "the industry chain to promote innovation LED application is the key to avoid chip overload work, with a smaller current density, appropriate multi-chip, Power and cooling requirements, to maintain the total manufacturing costs remain unchanged or little change on the basis of LED products to further improve the luminous efficiency and reliability.
Chip: "four high" corresponds to more requirements
So, what kind of LED display is considered a real high-quality display? "I think that is mainly reflected in the six aspects." Hangzhou Silan Ming Core Technology Co., Ltd. General Manager Jiang Zhongyong told the "China Electronics News" reporter, "First, LED display uniformity, that is, brightness and color uniformity is good; The display is dead light or very little dead light; three low gray uniformity is good; four is after long-term use, the above indicators change small; five LED high brightness, energy saving;
Brightness enhancement is the eternal issue of LED chip manufacturing, in addition, as the decision to determine the quality of LED display one of the leading factors, the technical level of the chip on the quality of the display what specific impact? Jiang Zhongyong said that the specifications of the chip determines the size of the package, the increasing demand for uniformity; chip electrostatic protection level and the long-term stable operation of the display are inseparable; chip junction capacitance more consistent, the better the low gray uniformity; The chip also determines the LED display small leakage ratio and level.
Specific to the indoor display, the high-quality LED display "four high" attribute on the chip made a specific request. Huazhen Optoelectronics Co., Ltd. Dr. Wang Jiangbo in an interview with "China Electronics News" reporter said that the first is the "high density", the chip is getting smaller and smaller, more and more consistent requirements, but the single chip The higher the frequency of the chip, the longer the chip in the back pressure state, the corresponding chip performance must also be improved; again "high refresh", the higher the refresh rate, the higher the frequency, the higher the frequency, Chip in the high-frequency pulse current tolerance of the higher requirements; the last is the "high gray", requiring the chip in a variety of current wavelength and brightness consistency better.
"For outdoor display, from the straight tube to 3535 surface paste, requiring the chip's light-type consistency better, higher brightness, moisture and moisture better." Wang Jiangbo stressed.
Devices: five trends lead the technology development
LED display device is to determine the quality of LED display another leading factor. "At present, the five trends are leading the development of industry technology." Shenzhen Lehman Optoelectronics Technology Co., Ltd. Chairman and President Li Man iron in the "China Electronics News" reporter said.
Fewer operating costs are the constant pursuit of LED display operators. "The first trend is LED devices continue to improve the brightness, display power consumption declining." Li said, "Only in this way can continue to reduce the operating costs of LED display.
And everywhere the light pollution, has been the impact of ordinary people's lives. Following last year, Shanghai took the lead in the introduction of public places LED display brightness limit mandatory standards, from May 1 this year, every day 22:30 to 7:30 the next day, Guangzhou City, outdoor LED electronic display was required shut down. "LED display on the light pollution management has gradually formed a consensus, so the second trend is that LED devices must reduce light pollution." Li said.
The third trend is that the surface mount device is moving from the inside outdoors. "Through the continuous exploration of mechanical, thermal, materials science, optics and other comprehensive disciplines, surface mount devices outdoor application reliability greatly improved, waterproof, moisture, anti-UV and other properties have been able to basically meet the needs of outdoor applications." Li Man said "At present, the surface mount device from the indoor to outdoor technology has become mature."
"The pursuit of outdoor HD display is endless, LED high-definition display records are constantly being refreshed." Li Man iron said, "LED screen point spacing is getting smaller and smaller, smaller and smaller device size, which is the fourth A development trend.
The last development trend is reflected in the display of the screen. "The industry through the use of improved surface mount device contrast technology and glue matte technology, a substantial increase in the LED device display." Li Man iron said, "but with the market to improve the quality requirements of the display, LED The device should also meet the higher requirements for quality. "