On November 12，the second China (international) Micro-LED display peak BBS "was held in shenzhen, China. It is co-sponsored by China optical optoelectronics industry association liquid crystal branch, China semiconductor lighting /LED industry and application alliance, China electronic materials industry association, nanjing flat panel display industry association, Taiwan display device industry association and guangdong micro-led Micro display industry technology innovation alliance and jointly undertaken by southern university of science and technology, Shanghai shunlian cultural communication company and shenzhen small, medium and micro enterprises innovation development research institute.
Academician of Chinese academy of sciences, nanjing university, zheng Youliao academicians,ministry of industry and information technology electronic information department Dr. Guan zixiao, section chief of shenzhen science and technology innovation committee Zou jian,Liang xinqing, executive vice chairman and secretary-general of liquid crystal branch of China optical optoelectronics industry association;Guan baiyu, secretary general of China semiconductor lighting /LED industry and application alliance;Yuan tong, executive vice President of China electronic materials industry association;Xue wenjin, vice President of nanjing flat panel display industry association;Zhang Shangwen, secretary general of Taiwan display industry association;Xu xiaotian, former secretary general of China semiconductor industry association;Hong zhen, secretary general of led display application branch of China optical optoelectronics industry association;Sui shirong, President of shenzhen LED industry federation; sun zhengmin, consultant of shenzhen flat panel display industry association; professor guan xudong of Peking University; professor zhang baizhe of tsinghua university nearly 500 guests attended the conference,At the same time, this conference has been strongly supported by the third generation of semiconductor research institute in shenzhen, the south university of science and technology, shenzhen university, central south university, Beijing jiaotong university, the semiconductor industry in guangdong province institute of technology, south China university of technology, fuzhou university, Beijing university of technology, hebei university of technology, Taiwan jiao tong university, Columbia University, South Korea kyung hee university and other colleges and universities support.
Host: professor liu zhaojun, southern university of science and technology
Host: Hu Chunming, deputy secretary general of liquid crystal branch of China optical optoelectronics industry association
Host: Hong zhen, secretary general of led display application branch of China optical optoelectronics industry association
Strengthen the display of forward-looking technology layout and the transformation of results At the meeting, as the sponsor's representative, Liang Xinqing, executive vice chairman and secretary-general of liquid crystal branch of China optical optoelectronics industry association delivered a speech. He said：
The year 2018 is about to pass. For the global display industry, it is both a "year of upheaval" and a "year of opportunity".The technical iteration has not been completed, and the contradiction between supply and demand leads to price fluctuations that affect the further development and expansion of enterprises.On the other hand, the new-generation information technology revolution, such as artificial intelligence, cloud computing and big data, is providing more market opportunities for new display technology innovation.New display technologies including micro-led and QLED are also gradually moving towards industrialization.At present, China's display industry has a certain global competitiveness inTFT-LCD display technology, and has initially achieved industrialization in AMOLED display technology after South Korea.However, to ensure the healthy development in the global competition in the future, China's industry still needs to make great efforts in forward-looking display technology layout and achievement transformation.
Breakthrough · Micro-LED technology innovation and developmentAt present, Micro LED technology is very good, but it still has not solved the problem of how to transfer a large number of micron size to the subgrade board, making it impossible for many enterprises to realize Micro LED mass production.There are also full-color schemes, current control issues, inspection standards, or production costs.What solutions do academics, r&d organisations and companies have?At the morning meeting, the seven celebrities gave their own answers.
Academician of Chinese academy of sciences, Nanjing university, Zheng Youliao academician the "Micro - LED technology development trend of" the wonderful report.He said:
Microminiaturization is the inevitable trend of LED display screen evolution. The development of LED industry must go to miniaturization, which is an objective law and market drive. In order to develop, the company must go this way.Mini/Micro miniaturization technology has a wide range of routes, each showing his own talent. Starting from the high end and high order, as an industry, it is obvious that losing money products cannot last long. Start from the high order, step by step, and gradually develop.According to the different requirements of different levels of IT terminals, small spacing, mini-led and micro-led are bound to be complementary and synergistic development, that is to say, although MicroLED came out, Mini LED still need to be used, small spacing also need to be used, because different terminals have different needs, these three are complementary and synergistic development for quite a long time.
Liu Jimei, principal professor, department of electrical and electronic engineering, Hong Kong university of science and technology, elaborated on "the opportunities and challenges of single-chip integrated Micro-LED technology"。She Pointed：
With monolithic integration, you can solve almost any problem, such as thermal, current, or SMD, without packaging materials, more cost-effectively, and it can be integrated with micro-led technology.Of course, there is still one problem to be solved -- full-color imaging.At present, the implementation of full color LED microdisplay is still the biggest challenge.Because it is not practical to selectively grow three luminescent diodes of different wavelengths on one substrate to produce three primary colors.
LETI CEO Francois Templier shares the theme "challenges of high-performance gallium nitride micro-led displays.He admits：
In the preparation of high-performance gallium nitride micro-led, there are three major challenges: one is to ensure mechanical and electrical contact, two is to maintain a very high pixel, and three is to promote the electronic performance of the product.If we want to solve the challenge in the mass transfer process, we can first transfer through the technology of microtubules, which are inserted into the electropile and inserted into the process of equipment chip technology.We can grow micro-tubes in micro-led wafers.
Plessey CTO Keith Strickland doctor explained it in depth“GaN onSilicon Platform for Micro LEDs”。He introduced：
Silicon based gallium nitride technology has many advantages: it can use large wafer diameters, save costs, and scale up. Large wafers can achieve larger chips and integrations, including power and LED, intelligent lighting integration, etc., and it also has micro-scale processing capacity.Of course, when gallium nitride and silicon materials do not match and dissolve back, it is easy to cause low yield, temperature deficiency and cracking of wafers.But Plessey has solved that problem.Through our research, we have produced very small leds with light efficiency up to 50%, and low losses can greatly reduce the peak EQE to very low current levels.
Ioannis (John) Kymissis, a professor at Columbia University, details "the application of Micro-LED microdisplays based on TFT backplane. He said，
The process of TFT is used to make lightweight equipment. TFT starts from LED wafers and achieves high performance through the operation of transistors.Micro-led microdisplays with TFT backplane can be applied to AR augmented reality lighting. Many displays can be applied to large AR fields. In fact, many displays have no target application, even though they have very good performance in brightness.Micro leds are ideal for this level of brightness, as well as for AR augmented reality applications.Initially we need to apply it indoors, and eventually as the technology continues to evolve, we will apply it outdoors.
Professor sun xiaowei of south university of science and technology explained Micro-LEDand its color technology in detail. He thought：
Thanks to the progress of quantum dot technology, it is possible to continue the method of luminous medium. The particle size of quantum dots is generally between 1-10nm, which can be applied to micro-display with smaller size.Quantum dots can also emit fluorescence when excited, and the luminescence color is determined by the material and size, so the different luminescence wavelengths can be changed by regulating the particle size of quantum dots.However, quantum dot technology still has some shortcomings, such as poor stability, high heat dissipation requirements, short life and need to seal, poor color uniformity, and easy interaction between colors.
Based on the development experience of Mikro Mesa Technology in Micro LED, Chairman liyi Chen focused on introducing the paradise road of μLED display.He pointed：
In fact, for micro-led manufacturers, there are several ways to go.Some do micro-led integrators, some simply do μLED, but after the industry size becomes large, can only do small market,but when the scale of the industry becomes larger, we can only do small market, and it is difficult to do large market, or build our own μLED factory, now it is more than $4 billion to build a factory, the cost is very high.As we mentioned last year, there will be a pilot product in 2018-2019. Samsung has announced that a small number of micro-led products will be launched in 2019,Small size μLED are being made, opportunities are open, and many people have access to them, but the industry is slow to integrate.I think it's doubtful that micro-led is still a game dominated by these big guys.The "hand of god" is a fast and reliable μLED.
Leading the innovation and development of micro-led industryDr. Xu chenke of SAN 'an optoelectronics made a keynote speech on "key technology progress of RGB Micro-LED". He introduced，
At present, sanan optoelectronics can form RGB full-color Micro LED display, among which the external quantum efficiency (EQE) of the RGB chip is estimated to be 18%, 30%, and 60% in order, which will continue to improve in the future. Currently, the minimum chip of sanan is 12×20um.Looking ahead to next year, he pointed out that in the first quarter of next year, SAN 'an optoelectronics will build a production line of micro-led,Now we can only achieve the chip size of 12×20um. If this line is built, we can achieve 5×10um, which is our target.
（Play Nitride）Li Yunli chairman give the speech "PixeLED shows the development of technology, challenges and opportunities" . He said：
While micro-led has many advantages, it's not going to be a replacement technology any time soon, not going to replace LCDS, not going to replace OLED.In particular, some of the most mainstream display products, such as televisions, mobile phones and watches, are difficult to compete on price.It's actually a very price-sensitive product.A pointcut is necessary, but it will not happen immediately, and it may take a relatively long time to drive costs down until the effect is seen.
Yan qun, professor of fuzhou university, emphasized that "Micro-LED drives the next generation of information display technology revolution“. In his opinion，
Micro-LEDMicro-led is the hot spot of today's display technology, is also a perfect transparent display solution, has a wide range of application scenarios, covering all the current display applications,However, it still faces multiple challenges to become a mainstream display technology, such as colorization, mass transfer and Micro-LED display defect control. He believes that a mainstream display technology success factor include: 1, new market demand drivers such as interaction, three-dimensional space; 2. Better display effect, including color, resolution, brightness, contrast, power consumption, etc;3、Wide application fields (size, flexibility, transparency, shape);4. Mass production (with mass production technology);5. Low mass production cost (low mass production cost);6. Strong integration (with integrability);7. Powerful technology drives elites (integration of technology, resources and capital).
Mr. Du zhiyou of China Micro semiconductor equipment (Shanghai) co., LTD explained the challenge and opportunity of micro-led display to the equipment industry in detail. He hopes：
As an equipment company, we want to work with equipment manufacturers to drive the development of micro-led and make micro-led possible.As the mini-led gets smaller and smaller, a lot of automation or standards will also become an important part. In this process, many IC experiences can be used for reference or can be taken over. If these standards are used in LED in the future, especially in micro-led, we can communicate and discuss with customers.
Jin Jang, professor of gyeong-hee university of South Korea elaborated the application of TFT technology in flexible substrate micro-led display.In his report, he stated:
We studied the new laser topology, the blue laser is very cheap, we used the blue part of the research, of course the laser is very expensive, and its penetration is not very good, make the whole process is very complicated, we need to make full use of the blue laser.The whole process is very similar to the traditional BLA, so we operate with blue light, at the bottom, we see the blue part can apply the scanning of BLA, can achieve the crystallization process.The fluidity is very good, and there is no LTPS technology, which can be applied to micro-led by blue ray laser.In fact, we have been able to design this kind of accessory, which has a very high density and can be used in manufacturing.At the same time, we can improve the performance of TFT backplane through this technology.
Tesoro Scientific, Inc. Francois j. Henley shares "high yield micro-led manufacturing technology using online detection and mass transfer". He introduces：
We have been committed to the research of quality transfer and TFT array, and this company is founded by me. The most important thing is the manufacture of routemap for TFT, which is similar in AMOLED detection, namely the function of semiconductor substrate.This test is interrelated. We have an online test to reduce the defect rate to less than 1/20, which means the yield rate is 95%. For the yield calculation, it is very difficult to make the LED substrate perfect.This equipment can make efforts in this regard to further reduce its defect rate.Have defects after a calculated, including indicates rate, Micro - LED test in the process of defects, formed by the semiconductor carrier defects, and mass transfer in the process of assembly defects, such as the basic measurement, it is also need a complete scientific monitoring, to determine its stability, indicates rate and the detection of mold function.
Yole Development company Eric Virey has a great presentation "MicroLED display: ideal and reality;Opportunities and challenges "。He points，
Smartwatches are very attractive applications for micro-leds. For TVS, the functionality of micro-leds is very good, but the cost is also very important.New mobile phone is the most difficult areas, there are several reasons, although we have corresponding simulation process, although can greatly reduce the cost of the transfer, relatively smart phone cost is more high than TV, so we need to use a very new technology to put all the pixels enriched to the size of the smart phone, can greatly improve the effect of smartphones.
Ledman Optoelectronic Co.,Ltd. Chairman Li Manti delivered a keynote speech centering on the "application of COB technology in the field of small spacing and micro display". He indicated：
Currently, Micro LED display technology to be breakthrough mainly includes: RGB flip chip miniaturization technology, LED microchip wavelength, brightness consistency technology, substrate technology, mass transfer technology, chip bonding technology, LED microchip mass testing technology.While lehman COB LED display technology is mainly small spacing around the COB technology integration innovation, from the whole industry chain including chip: wavelength profile, brightness and COB matching, PCB substrate: meet the requirements of high reliability encapsulation, drive IC satisfies the requirement of high integration COB show, meet the requirements of the light color consistency correction, equipment using lens molding equipment, new problems by solving COB, greatly promote the technical progress of the whole industry.
Zhou guangming, China market director of konica minolta (China) investment co., LTD., introduced in detail "the application of advanced optical detection solutions in Micro and Mini leds“. He points，
Common display problems, such as brightness deviation, chromaticity deviation, chromaticity/brightness non-uniformity, pixel and line defects, light leakage, Mura detection, image residue, Angle of view, etc.According to his introduction, konica minolta USES advanced technology and professional experience to provide measurement solutions in line with market standards from research and development to production quality.Its optical measurement scheme mainly includes: 1. Splitter luminance meter/color luminance meter, which is suitable for the display industry of research and development level, with high precision, high stability and measurable radiation Angle; 2. color illuminometer/spectrophotometer, suitable for lighting field, the light source measurement range is large, easy to use;3, color analyzer/imaging colorimeter, suitable for display industry production line, fast and efficient detection.
She qingwei, chief technologist of ruhao electronics Co., LTD Shared "new micro-structure LED that can realize full color micro-display". He introduces：
At present, we have been able to make RGB micro-led. What's next is flexible, preferably bent and preferably transparent.Spraying is the core technology, how to allocate the core spraying is the key.As for mass production, the current equipment is basically experimental. In the future, we will develop it into J3.5, which will be available next year.Our company is in foshan, and our equipment will come in next January. If you have any needs, you can come to talk about cooperation. How can we carry forward the micro-led technology in the future?
Clarity明晰·development direction of micro-led industryMicro-LED工业生长偏向大会报告环节后，还进行了精彩的圆桌论坛，在中国光学光电子行业协会发光二极管显示应用分会秘书长洪震、南方科技大学刘召军博士的联袂主持下，中科院院士、南京大学郑有炓院士，中国光学光电子行业协会液晶分会梁新清常务副理事长、秘书长，华灿光电王江波 副总裁，Google公司 Grace Lee，Mikro Mesa Technology陈立宜董事长，南京平板显示行业协会薛文进副会长等嘉宾就Micro-LED显示工业的生长现状和未来生长之路剖析了自己的看法。
目前通过小间距进入Mini-LED，然后再到Micro-LED，需要分步走。分步走有什么利益？我们国家的小间距LED企业许多，并且水平很高。其次，小间距、Mini-LED的技术壁垒不是太高，这样的话做起来会快一点。从工业角度来讲，Mini-LED能增进Micro-LED工业的生长。Mini-LED主要抓两个方面，一个是高端的大型显示领域，一个是车载显示，车载显示如果用的好，再往下一步就是Micro-LED显示。
——中科院院士、南京大学郑有炓院士
从应用的角度来讲，例如说对智能衣着、AR/VR，可以避开巨量转移的困难，Micro-LED的应用可能会走得比较靠前一点。另外关于比较大的显示领域，海内从小间距到Mini-LED，然后到Micro-LED，整个技术是有一定的传承性，在大屏幕的显示，包括公共显示以及信息显示上也会有比较好的应用。虽然希望未来有更大的市场，最大的市场会在消费电子上，但在消费电子的应用上，我们还需要解决更多的技术问题。
——华灿光电王江波副总裁
如果是循序渐进不绝去革新技术，很难说哪些新的技术突然出来就会取代了原有的技术。有可能一个新的完全差别的方法出来就推翻了一切。就我们来说，或许是Micro-LED在AR/VR领域也还没有很明显的市场。Micro-LED什么时候可以真正应用到产品，这是一个问题。既然是这样子，必须要潜下心来思考该往哪边走，而不是很快地出一个工具，这个工具不见得在五年后照旧最好的。
——Google公司 Grace Lee
Micro-LED要普及，可能还要五六年的时间，可是如果能够跟TFT工业结合得很好，普及的速度就可以快一点。——Mikro Mesa Technology陈立宜董事长
南京平板显示行业协会薛文进副会长
最后，南京平板显示行业协会薛文进副会长指出，“面对Micro-LED生长机缘，关于企业来说，怎么走是很重要的课题，这也就是此次联合了三大领域多家行业协会一起举办此次集会的初志”。他希望：下一年Micro-LED显示岑岭sds论坛能够继续发挥这方面的作用，这三大领域不管是院� Ｕ站善笠�，通过这个平台建立更有效的交流相助，进一步从面上的交流向比较实质性的相助偏向生长，真正地推动我国Micro-LED产学研用协同生长。
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