The hottest thing about the development of microle

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About the development of micro led, industry leaders have said that

micro LED is regarded as the next generation of display technology. Taiwan, China has rich experience in LED manufacturing and has established a complete industrial chain. Facing the rise of OLED displays in recent years, it is actively investing in micro LED technology to seize the next wave of business opportunities

however, due to various technical limitations, the industry consensus is that it will be at least 5 years before micro LED display is officially mass produced. Before micro LED is officially mass produced, the display products that import Mini LED backlight into LCD will be the first to appear on the market

in the major consumer electronics or display technology exhibitions in 2018, micro LED displays and liquid crystal display (LCD) screens of mini led backlights are undoubtedly the focus of magnesium lights. Major manufacturers including Samsung, Sony and AUO all display relevant conceptual products

micro led outperforms LCD and organic light emitting diode (OLED) in terms of technical life, contrast, energy consumption, reaction time and visual angle. Major global leading manufacturers have already actively deployed, and Hon Hai has invested heavily to build the whole industrial chain of micro led, which will help promote the commercialization process of micro LED

touch Taiwan 2018, which appeared at the end of August 2018, also added a special theme area of "microled/miniled products and solutions" for the first time. Many large LED and panel manufacturers in Taiwan participated in the war to show the latest technologies and solutions. According to the report of ledinside, a research institution, the market output value of micro led and mini LED will reach 1.38 billion US dollars by 2022

led technology has made rapid progress. Nowadays, the penetration rate of LED bulbs has been much faster than expected a few years ago

Deng Shaoyou, senior director of the product management group of the EPISTAR business and marketing center, believes that in 2005, the industry generally believed that the LED general lighting market would reach saturation in 2020. However, up to now, the prices of LED bulbs and fluorescent tubes in the market have been comparable, and the saturation of the LED general lighting market occurred 2-3 years earlier than expected

therefore, Deng Shaoyou also pointed out that although the industry generally believes that it will take 5-6 years for micro LED displays to be mass produced and popularized, according to the current speed of technological development, micro LED displays are likely to occur as early as the development process of LED general lighting

the LED industry chain is complete, and the precision machinery market has potential

from the era when the cathode ray tube (CRT) display is in power to the recent rise of OLED displays, Asian manufacturers have always played a very important role in the display industry chain. In Taiwan, he has rich experience in LCD and LED production and has mastered many key technologies; Coupled with the robust equipment manufacturing industry, it is expected to occupy a place in the precision machinery manufacturing field of micro LED manufacturing in the future

Huang Jianzhang, deputy director of the Institute of Optoelectronics at National Taiwan University, pointed out that Taiwan is a rare region with very complete LCD and led industries. Therefore, in the development process of micro LED display technology, manufacturers in Taiwan will be more able to layout terminal brands and precision machinery

Huang Jianzhang, deputy director of the Institute of Optoelectronics at National Taiwan University, pointed out that in the development process of micro LED display technology, manufacturers in Taiwan will be more able to layout terminal brands and precision machinery

however, at present, most of the precision machinery manufacturing technology involved in LCD manufacturing is mastered by Japanese manufacturers. Although the precision in Taiwan meets the different needs of customers, machinery manufacturers have excellent production quality, but most of them are production tools and machines. In addition, at present, a large number of technology transfer has not been decided, so most operators in Taiwan are still waiting, and few manufacturers have begun to invest resources in research and development

however, Huang Jianzhang believes that although there is a huge amount of transfer at present, the development of various schools has not yet been finalized, which transfer technology will be the mainstream in the future, but no matter what technology method becomes the mainstream in the future, highly precise physical alignment processing will be required in the transfer process, so the market demand potential of precision machinery will be quite huge, and manufacturers in Taiwan have excellent performance in precision machinery manufacturing, Therefore, there will be a lot of room to play, and it will also be an important entry point for Taiwan factory to become a key manufacturer in the micro LED industry chain

because they are optimistic about the LED talent and technical resources in Taiwan, many large foreign manufacturers have also begun to invest more resources in Taiwan to rush into the microled manufacturing market. Yang Guihui, director of global identification and lighting technology sales of Merck, pointed out that Asia is still the most important region in terms of LED or display manufacturing market. Therefore, Merck has gradually stationed its business executives related to LED and display in Asia in recent years

Yang Guihui, director of sales of Merck global recognition and lighting technology, pointed out that Asia is still the most important regional market, whether it is led or display manufacturing market

Yang Guihui also mentioned that application test is the most important and time-consuming stage in the process from material supply to mass production. In order to provide customers in Taiwan with the latest LED related materials from time to time and make the feedback of experimental results more real-time, Merck has set up three laboratories in Taiwan. Including the liquid crystal raw material research and development laboratory in Taoyuan and the integrated circuit (IC) material application research and development center established in Kaohsiung in 2017, we hope to cooperate closely with customers and provide solutions in real time

With the help of OLED experience, micro LED driven IC develops faster.

Huang Zhaonian, deputy general manager of Lunda electronic technology center, pointed out that the LED industry has developed in Taiwan for nearly 50 years, and many of the currently hotly debated micro LED technology development directions have been tried in the past. However, at that time, resources, equipment and materials were not in place, so the relevant concepts were not specifically realized and commercial finished products were seen. But up to now, many conditions have been met, so the accumulated technical energy in the past will gradually see results

for example, Taiwan once invested in the development of OLED display technology 10 years ago, but in recent years, the key equipment and materials of this display technology have been controlled by Korean manufacturers. Although it is difficult for manufacturers in Taiwan to become key suppliers in the OLED display production chain, the research results left when they first invested in the research and development of this display technology will help the development of micro LED display technology. For example, the architecture of driving IC is an important project

there are many methods of massive transfer, and the grain manufacturing process is an important challenge.

the development of micro LED display technology has attracted much attention, among which massive transfer is undoubtedly the technical bottleneck that many manufacturers urgently need to break through. The industry generally believes that the transfer yield must reach 99.99999% to be qualified. However, no matter what the transfer method is, the yield has not yet exceeded 99.999%. Moreover, different transfer methods will correspond to different grain processes, and the repair methods of bad points after transfer are also different. The challenge of improving yield is not only in the transfer process

Deng Shaoyou pointed out that how to miniaturize led while still maintaining the same efficiency is an important challenge for LED in the epitaxial and long crystal process stage

Huang Zhaonian also said that micro LED is very different from the traditional LED process since it starts from the LED grain process. For example, the weakening structure must be introduced in the long grain process to make the grain easy to grasp, and the subsequent transfer process can be carried out smoothly

on the other hand, mukund raghunathan, product marketing manager of KLA Tencor, said that in micro LED technology, each LED chip constitutes a pixel, and as long as a defect or contaminated particle can cause pixel damage. Therefore, the production of defect free epitaxial wafers is also an important task for process engineers

reduce the difficulty of large-scale transfer, and the glass substrate has become the mainstream of micro led small-size

because the glass substrate is easier to realize large-scale transfer than the PCB substrate, it has become the technology optimization direction of many manufacturers. Glass substrate has become the preferred solution for small and medium-sized microled displays such as, smart watches, etc

Chu Yuchao, Research Associate of ledinside, a research institution, pointed out that in 2018, it is worth noting that many manufacturers began to display spliced large micro led billboards. For example, Sony exhibited the "Crystal LED integrated structure" display in 2017 and announced that it was about to start selling; Samsung also announced that the wall will be on sale in the second half of 2018, and large micro LED displays will be mass produced

Chu Yuchao pointed out that in 2018, many manufacturers began to display spliced large-scale microled billboards

Chu Yuchao believes that among all the products currently displayed, Sony's clips display technology is the most mature. Since the PCB size used by Sony clips is already the current limit, the grain grade of micro LED has been less than 30 microns (micrometer, μ m) The active drive scheme is adopted. In terms of this technical architecture, the major challenge in the future will still be the huge transformation of micro LEDs, and more and more existing bridges need modern update solutions to move to PCB

Chu Yuchao further explained that due to the low flatness of PCB board, it is difficult for microled grains to be directly transferred to the original industry of PCB board and cannot create profits. In terms of the grain size of Sony less than 30 microns, in the process of transferring the grain to the PCB, it must be transferred to a temporary substrate before it can be transferred to the PCB again. The process of transferring micro LED grains to glass substrate is relatively easy. Therefore, at present, many manufacturers are thinking that if the cost of micro LED is to be reduced in the future, it may be necessary to consider replacing PCB with glass substrate, and then using glass substrate as the active driving scheme of TFT, so as to reduce the manufacturing cost. For this reason, glass substrate has become the mainstream solution in the development of small and medium-sized micro LED displays such as smart watches

PCB is the mainstream of large billboards, and the demand for resolution is gradually increasing

although glass substrates can reduce the difficulty of massive transfer, if glass substrates are spliced into large display screens, many unresolved technical problems may also be encountered. Therefore, in the application of large billboards, the PCB substrate scheme will still be the main one

at present, the traditional LED large billboard market is quite mature, and the demand for RGB LED chips is very large. Therefore, in a short time, this market will be an important led, and all parts of the equipment will normally turn on the power switch to the sea. For relevant manufacturers, the miniaturization trend of LED is nothing more than a good strategy to deal with the current market properly, and then slowly move towards the scheme of smaller grain size

Huang Bingkai (Figure 5), manager of the micro led business department of accumulation technology, pointed out that the indoor large billboard market with high resolution requirements is the company's current important business direction. Nowadays, the mainstream pixel pitch of large indoor billboards is 0.9~1.5mm, and the lower the pixel pitch, the higher-order driving scheme is required

Huang Bingkai, manager of the micro led business department of accumulation technology, pointed out that the indoor large billboard market with high resolution requirements is the company's current important business direction

due to the impact on the display quality of large billboards

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