Shenzhen Lianchengfa Technology Co., Ltd.

Looking back at the rapid development of China's LED display industry in recent decades, it has always been accompanied by the continuous attention of LED display companies to advanced technology and innovative awareness. With the continuous progress of display technology, the competition of screen enterprises has gradually shifted from the competition of downstream applications, and the competition in technology and patent competition has opened up, and the innovation of the industry has been gradually upgraded. At the beginning of the spring of 2022, the editor of LCF has sorted out some of the new technologies in the industry that are most likely to have an impact on the industry in the next year. Let's take a look!

Full-color chips, a leap forward in the development of Micro LED technology

  At present, Micro LED, known as the "ultimate display technology", is in a research and development boom, and the results are coming one after another. The industry has put forward various technological upgrades, innovations and ideas around upstream chips, midstream packaging, and downstream applications, and they have been gradually implemented. Micro LED is still in the exploratory stage, and it has been accompanied by continuous attention and investment in the industry. As one of the most basic and core components of the LED display, the chip is leading the first round of innovation when the spacing is dropping. One of the major bottlenecks of micro LED technology is full color. With the efforts of the industry, this technology will make new breakthroughs in 2021. In September 2021, Jingneng Optoelectronics successfully prepared red, green and blue silicon substrate gallium nitride-based Micro LED arrays, taking a key step in the development of Micro LED full-color chips.

  For a long time, the development of China's third-generation semiconductor industry has been slower than developed countries, and the country has been promoting the third-generation semiconductors represented by gallium nitride and silicon carbide, zinc oxide, aluminum oxide, diamond and other wide band gaps. With the gradual development of the policy guidance effect, China's third-generation semiconductor industry has ushered in a period of rapid development. For the entire LED display industry, the upgrade iteration of display technology is still on the rise, and the future innovation and upgrade of Micro LED technology will be a continuous boom in the industry. Full-color Micro LED means that the "ultimate display technology" is one step closer to our lives, and the problem of overcoming full-color is mainly focused on the research and implementation of red light chips. Every step in the research and development of micro LED technology is to overcome difficulties, and the road to commercialization is still far away, and the breakthrough of full-color technology has allowed the industry to see the track of the development of display technology step by step.

Delivery of the first glass-based product for real mass production

  On December 20, 2021, the mass production and delivery ceremony of the first glass-based AM MiniLED MNT product was held simultaneously in Beijing and Hefei. For a long time, among the backplane technologies of mini/micro LED key technologies, there are mainly two types of backplanes used in Micro LED technology in the field of consumer electronics: printed circuit boards (PCB boards) and glass substrates. Due to the large expansion and contraction ratio of the brushed circuit board under the high temperature generated by multi-lamp welding, it is prone to warping, which will result in poor mass transfer effect and affect product yield. The PCB board requirements of mini/micro LED are higher, but at present, the domestic high-quality PCB board has low price and high cost, and the cost is higher. To carry out further research, it is necessary to meet the standard board. The glass substrate has good dimensional stability, but its lateral and vertical dimensional changes are not isotropic, which requires high processing technology. However, due to its stable nature and relatively mature production chain, glass substrates have considerable advantages, especially in the fields of commercial display and transparent display.

  Since the LED display has gradually matured, PCB has always occupied the absolute position of the LED display backplane. The successful mass production and delivery of the glass-based MNT backlight project means that the domestic mini/micro LED substrate technology has reached a new development inflection point. It marks that LED display glass-based products have officially entered the market from the laboratory, and it also means that new choices and branches have emerged in the industry in the process of technological upgrading and iteration. Under the impact of a new wave of industry competition, glass substrate technology has been successfully applied in the market, showing great market potential, especially in the field of commercial display and transparent display, which satisfies the market's demand for new and advanced LED displays. A sense of appearance and the needs of multi-element applications. Perhaps in the new year, the application of glass substrates in LED displays will change the application pattern of LED displays.

New materials and new technologies, the way to break COB packaging

  Since the spacing of LED small-pitch products has been continuously lowered, to the LED display technology with a new concept in the industry - micro LED, countless people are thinking, how to realize the technological transition? The most basic and important step is to gather huge and tiny lamp beads on one module. Small-pitch products can still be packaged using SMD, four-in-one and other technologies, but with the gradual development and maturity of mini/micro LED technology, the display packaging pattern will also usher in a transformation again and again.

  For a long time, the advantages of COB packaging are significant, with good protection and allowing more lamp beads to be soldered in a module. But the defects are also obvious: the ink color consistency is poor, and the expansion of the encapsulation colloid under environmental changes can easily lead to damage to the lamp beads. In recent years, the industry has been proposing new solutions to these problems, or developing more stable packaging materials, or correcting screen color blocks through technical means. Just in April 2021, a screen company in the industry released a COB screen correction solution to solve the problem of Mini LED correction of COB color blocks and the poor fusion effect of large screen partitions from a technical point of view. The emergence of this new technology provides new ideas for the industry to overcome the difficulties of COB packaging technology. For a long time, domestic screen companies have been upgrading COB packaging technology to transform equipment and ring-adhesive packaging materials, or to optimize processes, or to limit application sites. Most of the equipment and raw materials in the domestic COB market are imported from abroad. In recent years, domestic packaging companies in various countries have gradually begun to develop new ring adhesive ratios and professional equipment, and have also achieved some achievements in 2021. With the gradual maturity of mini/micro LED display technology, China's LED display packaging industry may usher in a new round of rapid development in 2022.

  With the gradual iteration of display technology, technological innovation has gradually become a new guiding sign that affects the development trend of the entire industry. The birth of a new technology is likely to change the technological development trend of the entire industry in the future, especially when the development of new display technology is in the period of germination and growth. The industry needs innovation and needs fresh rain and dew to nourish. The LED display industry will also move towards a broader future driven by technological innovation. Lianchengfa Group will also ride the wind and waves, work together at a new starting point, and stride forward towards a higher, faster and stronger goal.