The perfect ending: Small Pitch and Mini LED Advanced Application Conference “Small Pitch Research White Paper” Achievement Conference

On September 1, the "2020 Expert POINT·Small Pitch and Mini LED Advanced Application Conference  the "Small Pitch LED Research White Paper" Achievement Release Conference" jointly organized by the 2020 Future Audiovisual Annual Summit and Expert Talk was successfully held at the Four Seasons Hotel in Shenzhen.

This year's event is like a cloud, with a crowd of elites. Nearly 500 CEOs/CTOs/CMOs of industry discuss the future development trend of small-pitch LED and Mini LED.

The content of the event is rich, and the "White Paper on Small Pitch LED Research" will be released for the first time at the conference! This white paper was jointly produced by Expert Talk and National Star Optoelectronics, and was jointly compiled by a number of participating units. It aims to make the LED display industry healthier and faster to break through the bottleneck to achieve rapid development and provide humans with a better visual experience.

Hong Zhen: Opening speech and the development status of 2020 LED display

Mr. Hong Zhen, Deputy Secretary-General of China Optics and Optoelectronics Industry Association, first gave an opening speech for the conference. Then Mr. Hong Zhen introduced the development of the LED display industry. There is such a proportional relationship between the upstream and downstream of the industry: the ratio of LED chip scale to LED packaging scale is about 1:5, and the LED packaging scale to downstream application scale is about 1:6.

Regarding the LED display market, he believes that the current LED direct display technology is flourishing, and there is a parallel situation of traditional SMD, GOB, all-in-one, COB and COG and other technical routes. The reduction of dot pitch is the development trend of LED display. When the screen size is 100-200 inches, the dot pitch of the 4K screen is about P0.5-P1.0. Entering the 8K era, the screen size is within the range of 100-200 inches, and the 8K screen The dot pitch is about P0.2-P0.5.

Nationstar Optoelectronics Guo Heng: Mini LED display technology: IMD or COB, who is in charge?

Guo Heng, director of the NationStar Optoelectronics Micro&Mini LED Research Center and deputy director of the R&D Department of the RGB Super Business Unit, said that display effects and comprehensive costs are the two major thrusts for the development of display products. At present, Mini LED has pain points such as ink color consistency, color consistency, yield, repair and maintenance in terms of display effects. In terms of comprehensive costs, there are problems such as material cost, turnover rate, manufacturing cost, and opportunity cost.

For the above problems, the IMD solution has better performance than other technical routes in terms of ink color consistency, color consistency, yield, reliability and cost. For P0.9, IMD packaging has comprehensive advantages in technology, cost, and rapid industrialization, and will be the mainstream technology route at this point pitch. In the range of P0.4-P0.7, the yield, repair efficiency, and cost of flip-chip COB are difficult to solve, so IMD has a certain first-mover advantage.

He Guojing, Nova Technology: Development Thoughts and Trends from Small Pitch to Mini LED Control System

He Guojing, vice president of Nova Technology, first introduced the display system architecture. The controller and the receiving card are collectively called the LED display control system. The control system is one of the core components of the display screen. Entering the 8K era in the future, it needs to be equipped with 5G rate transmission. For point-by-point brightness and chromaticity correction, Nova uses scientific-grade correction cameras to improve sampling accuracy, simulates human eye perception through CIE-XYZ aluminum sheets, and eliminates light mixing through algorithm and process optimization.

The image quality decomposition model includes five dimensions: spatial resolution, temporal resolution, dynamic range, color gamut range, and gray-scale resolution. Spatial resolution mainly focuses on 4K/8K high-bandwidth interface, ultra-high resolution reconstruction, 5G/10G ultra-large bandwidth transmission and LVDS transmission; time resolution mainly focuses on 3D display, virtual display, FRC and low latency; dynamic range mainly includes HDR10, Indicators such as HLG, HDR10-Optima; color gamut range mainly focuses on point-by-point chromaticity correction, 3D-LUT and color gamut management; grayscale resolution mainly focuses on point-by-point brightness correction, 18 to 22 or more bits, fine grayscale, ClearView And RGB independent Gamma adjustment and so on.

Kinglight Optoelectronics Shao Pengrui: Under the background of new infrastructure, the choice of Mini/Micro LED technology route

Shao Pengrui, Dean of Kinglight Optoelectronics Innovation Technology Research Institute, introduced the definition of Mini/Micro LED from the perspective of Jingtai. He believes that from a broad concept, Mini LED display refers to the display technology of N-in-1 SMD display devices with more than 1 pixel points, with 4-in-1 and 2-in-1 as typical representatives; Micro LED display refers to belt-driven It is based on the display technology of n-in-1 integrated display modules with pixel points greater than 1, which is represented by COB. In a narrow sense, Mini display means that the pixel pitch is between 0.3mm-1.0mm; Micro display means that the pixel pitch is less than 0.3mm. In terms of academic definition, Mini LED refers to a flip chip or vertical structure with a chip size of 80um-200um, and Micro LED refers to a flip chip or vertical structure with a chip size of less than 80um.

Mr. Shao Pengrui believes that from the perspective of industrial development trends, the Micro LED display technology represented by COB is gradually becoming mature. From market cost considerations, at the level of Micro LED technology solutions, the progress of mass production of the full flip chip solution will be delayed. In essence, the core problem of Micro LED display lies in the packaging technology, because the major changes in the packaging form have caused industrial changes, and the changes in the chip form alone are unlikely to bring industrial changes. Micro LED displays will bring about major changes in the display industry. In order to meet the advent of the changes, large-size Micro LED displays will not only seize the opportunities of large displays and new infrastructure, but also do a good job in the division of labor and docking of the industrial chain.

Ledman Optoelectronics Tu Menglong: New Application of Micro LED Technology in Ultra HD Conference Display Field

Tu Menglong, senior director of Lehman Optoelectronics Technology Research Center, said that the demand for remote conferences is strong, and consumers expect the products to be fully functional. In the future, conference tablets will be determined by parameters such as bonding, touch control, cover glass thickness, and screen ratio. , And then form a brand product matrix. The traditional LCD conference panel size is less than 100 inches, which can only meet the requirements of small conference rooms less than 20 square meters, while the Micro LED ultra-high-definition conference system can achieve conference systems of more than 100 inches.

The reliability of the Micro LED display based on COB technology is better than that of SMD, the surface is smooth, and human-computer interaction can be realized. In addition, Micro LED displays have the advantages of high contrast, wide color gamut, good consistency, and high refresh rate.

However, the promotion of Micro LED interactive ultra-high-definition conference system is facing price and technical issues. If the Micro LED panel is 4K, the dot pitch will be smaller, the number of LEDs will increase, the price will be more expensive, and the technical difficulty will be higher.

HC Semitek Li Peng: From Small Pitch to Tiny Pitch-Mini RGB LED Chip Technology Prospect

Li Peng, vice president of HC Semitek, first introduced the key technologies common to Mini LEDs: one is a high-reliability and high-brightness flip-chip structure; the other is the production of a high-efficiency passivation layer; the third is the smooth covering of the metal connection layer; the fourth is Highly reliable electrodes. In addition to the above-mentioned common technologies, HC Semitek also has unique key technologies for Mini LED: one is the light efficiency matching ability under different current densities; the second is high ESD performance; and HC Semi's proprietary chip hybrid technology.

For the key technology of Micro LED, Mr. Li Peng believes that there are six main points: one is the high consistency of epitaxial materials; the second is the precision control and yield of micron-level chip production; the third is the high yield of mass transfer; the fourth is the defective pixel Effective repair; fifth is the design of control circuit, drive and backplane; sixth is the effective realization of full color.

Aowei Marble: Analysis and Prospects of China's Small Pitch LED Display Market Segmentation under the Influence of the Epidemic and New Infrastructure

Shi Duo, research director of AVC at Aowei Cloud, said that due to the impact of the epidemic, China's mainland commercial display market declined significantly in the first half of 2020, down 21% year-on-year. All sub-sectors have shown varying degrees of decline, among which education, services, real estate, and transportation have been more severely affected by the epidemic. Regarding government security monitoring projects, 2020H1, tracking 263 publicly tendered security monitoring projects, an increase of 5% year-on-year, the total project value is 16.8 billion, an increase of 17% year-on-year. The public bidding project generally takes 3-6 months to win the bid, so the major security monitoring projects are concentrated in the second half of the year. The medical and emergency prevention and control system bears the brunt during the epidemic, and the expansion of medical institutions has driven the demand for display screens.

In general, due to the impact of the new crown epidemic in the first half of 2020, domestic small-pitch LED sales showed a negative growth of 3.8%, which is basically in line with the pessimistic forecast at the beginning of the year. At the same time, the government’s policy explicitly prohibits the construction of new buildings and halls, which will inevitably have a certain impact on the large-screen market. Therefore, the annual market forecast is lowered to 11.9 billion, a year-on-year increase of 15.3%. In addition, the replacement of DLP and LCD by small-pitch LEDs is also increasing its penetration. The conference and education markets are being cultivated, and companies should focus on growth industries.

Dicolor Wu Mingjin: D-COB Micro LED technology and application based on secondary packaging

Mr. Wu Mingjin, general manager of Dicolor Optoelectronics Research Institute, first introduced the development history of display technology, from the initial CRT monitor to DLP monitor, LCD monitor, LED high-definition display and then to integrated Micro LED technology. The dot pitch of LED display has developed from millimeters to micrometers, and from separate devices to integration. Since COB is an integrated package, it is the route of the Mini/Micro LED solution. It has the advantages of waterproof, dustproof, anti-shock, anti-impact, and anti-corrosion. COB is a surface light source, and has a wide color gamut and a wide viewing angle. Its display screen is more Evenly. However, COB also has pain points such as poor maintenance, difficult to control ink consistency, and low maturity of the industrial chain.

Dongshan Precision Zhou Heng: Full range of RGB devices and supply chain solutions under reduced pitch

Mr. Zhou Heng, product manager of Dongshan Precision, introduced the small pitch solutions of Dongshan Precision LED single lamp, including TOP1010/1212, 1212White/Black and Chip0606/0808/1010, etc., which can be applied to theaters and home theaters. Dongshan Precision's Mini LED display solutions include formal and inverted series. Formal product series cover P0.7-P1.5 pitch, 2&4 in 1 integrated packaging technology can not only prevent bumps, but also improve SMT patch efficiency and production capacity. 2 in 1 does not need to change the original single lamp PCB pad design, shortening R&D cycle and cost saving. Dongshan Precision's all-in-one solution uses patented surface treatment technology to upgrade the consistency of surface ink color, sorting and progressive scanning of incoming chips, reducing the risk of screen flickering.

Regarding the advantages of the Mini LED flip chip series, Mr. Zhou Heng said: First, the flip chip tinning/Flux solution can effectively reduce the thermal resistance of the product and make the screen temperature lower; second, the flip chip PAD spacing is larger. It can effectively improve the anti-metal migration ability and high refreshing ability; third, the gold-free packaging technology can avoid the problem of dead light caused by the virtual welding and fracture of the welding wire; fourth, the flip chip can be used for spacing below P0.7; It is the Mini LED flip-chip series using Dongshan Precision's patented surface treatment technology to achieve ultra-black ink color, high contrast and high color reproduction.

[Experts VS Huateng Semiconductor Dialogue] What should I pay attention to when purchasing a test sorting machine for Mini LED?

In this event, experts said that Cai Jiandong, CEO of Industrial Research Center, and Zhang Shaofeng, product director of Huateng Semiconductor, had an in-depth dialogue on "What new requirements are put forward for testing and sorting equipment under the trend of display miniaturization?" .

Mr. Zhang Shaofeng said that as the size of LED packaging devices shrinks, the chip size will inevitably be reduced. Mini/Micro LEDs are between 50μm and 200μm in size. The reduction in the size of the display light source puts new requirements on equipment technology: it can achieve high-speed and high-precision transfer, the ability to process exponentially increasing data, the ability to customize the development of structural design, and the ability to have independent batch image processing and motion The ability of trajectory control, etc.

Specific to the testing and sorting equipment, because it needs to meet the requirements of Mini/Micro LED turn-on voltage consistency, ESD/IR reliability, wavelength at low current, brightness consistency, more detailed and stricter classification, and control point testing and sorting costs, etc. To improve the motion control accuracy, image recognition accuracy, and photoelectric consistency of the test sorting device, the size of the sorting PP nozzle must be reduced, the test of the packaged device is completed on the blue film, and the consumption of Mini/Micro LED chips is Hundreds of times increase, so the speed and efficiency of the equipment is more important.

Mengtuo Tang Yangshu: Mini LED & Micro LED fully automatic repair program under high-precision requirements

Mr. Tang Yangshu, Chairman of Mento Mento first introduced the challenges faced by packaging in the Mini LED era. In terms of PCB substrate, it is necessary to ensure the consistency of PAD and good soldering effect; in terms of printing, it is necessary to ensure the uniformity and consistency of the amount of printed tin; in terms of die bonding, high-efficiency and high-precision die bonding equipment is required; in reflow soldering For furnaces, it is necessary to ensure that the welding has no offset and the welding effect is good; for repairs, it is faced with high repair costs, low repair efficiency, and poor manual repair quality.

Zhaochi Guangyuan Liu Chuanbiao: Mini LED technology in RGB discrete devices and BLU solutions

Liu Chuanbiao, general manager of the display division of Zhaochi Optoelectronics, said that the main pain points of Mini LED and small-pitch LEDs are reliability, ink color uniformity, ink color consistency, short circuit, dead light, leakage, air tightness, etc. In response to the above-mentioned problems, Zhaochi applies nano-protective coatings on the surface of LED chips and bonding wires to isolate the chips from water vapor and electric fields. Active metals ionize to produce metal ions and move directionally.

Regarding Mini LED flip-chip technology, Mr. Liu Chuanbiao said that since there is no need for wire bonding, the reliability of the solder joints is higher, the chip GAP spacing is larger, and the reliability is higher. In addition, since the light-emitting surface of the flip chip is not blocked by electrodes, the brightness of the same chip size is higher. Under the same brightness requirements, the colloidal blackness can be made blacker, improve the contrast, and at the same time, the drive current is lower, which can reduce power consumption. In addition, Zhaochi uses special process control to control the tilt and offset of the wafer after welding to fully improve the stability of the flip-chip process and the manufacturing yield; through the fully-automatic flip-chip layout, the full control of process details is achieved , And comprehensively improve production efficiency.

CVTE Liang Zhiquan: Opportunities and Challenges of LED All-in-one in the Conference and Education Market

As CVTE, which has been in the "leading position" in the interactive smart tablet conference market for three consecutive years, its product director Mr. Liang Zhiquan shared the layout and progress of CVTE in the LED all-in-one machine at the meeting.

Mr. Liang Zhiquan said that driven by the large-size market demand, CVTE finally chose the more obvious LED display as the new development direction of the all-in-one machine in the technical route of LCD, projection and LED.

At the same time, he especially shared the opportunities and challenges of LED all-in-one computers from the perspective of CVTE. He believes that traditional LED displays have problems such as large space occupation, complicated installation and wiring, time-consuming debugging, and a single form of interaction. From the user's point of view, the use of the LED all-in-one machine should be as convenient as using a TV, that is, to meet the requirements of integrated design, standardized display, humanized operation and lightweight construction. The opportunity lies in the current huge stock market, low technology integration, low user activation, large price reduction space, and diverse product standards. On the other hand, the challenges faced by LED all-in-ones include product quality, interactive experience, display effects, and integration. Cost and safety compliance issues.

 "2020 Small Pitch LED Research White Paper Results" released

 Experts said that Cai Jiandong, CEO of the Industrial Research Center, released the "Fine Pitch LED Research White Paper" at the event. At the same time, he thanked NationStar Optoelectronics, Unilumin Technology, Silan, HC Semitek, Huateng Semiconductor Equipment, Ipas New Materials, Xi The contribution and support of the participating units such as Da Electronics, Zhongqi Optoelectronics, Lehman Optoelectronics, Riyuecheng, Yinghua New Materials, MEAN WELL Power, Tecco Chemicals, Dahua Co., Ltd., Guangjiayi and other participating units, and awarding participating units on the spot certificate.

The "Small Pitch LED Research White Paper" survey lasted 9 months, surveyed 41 companies, and 14 participating units participated in the preparation of the white paper. Mr. Cai Jiandong shared some of the wonderful content in the white paper with the audience. The important development stage of LED display in the past 25 years, the industrial logic of promoting the reduction of LED display pitch (Pitch), and announced the proportion of LED display market composition, LED display unit area output value contribution, LED display structure cost, Data such as the price trend of RGB packaged devices, the scale of LED display production value, and the definition and analysis of Mini LED and Micro LED.

In addition, the report card and investment trends of the LED display industry in the first half of the year were also shared, and the market size of professional displays and conferences, theaters, large-size TVs and other scenes was calculated, as well as the trend outlook for the second half and next year.

Experts said the industry research center data shows that in 2019, the global LED display market reached 45.2 billion yuan, of which the LED small pitch (≤P2.5) display market was 17.3 billion yuan, accounting for 38.23%. In 2020, due to the impact of the new crown epidemic, there will be a phased decline in 2020, mainly due to the contraction of outdoor and commercial activities caused by the epidemic. Experts say the Industrial Research Center expects the global LED display scale to decline by 8% in 2020 to 41.6 billion, with small spacing displays The screen decline rate is slightly lower, less than 5%.

The global LED display screens will gradually begin to recover in the second half of 2020. Although they are still facing greater uncertainty, they are expected to be on the growth track in 2021. With the development of Mini LED direct display (Mini RGB) technology, the ( Such as movie theaters, large-size TVs, enterprise-level conferences, education, etc.) penetration, experts say the industry research center LED display industry is expected to exceed 100 billion yuan output value in 2025, the compound growth rate of 2020-2025 exceeds 21%, small-pitch LED display The proportion of the screen will also rise from 38.23% to 56.11%.

So far, the "2020 Expert Point·Small Pitch and Mini LED Advanced Application Conference and the "Fine Pitch LED Research White Paper" Achievement Conference" has successfully concluded. Although only this day, this is a fulfilling and unforgettable event. The new display Mini/Micro LED will bring about a reshaping of the industry structure. The advancement of small pitch and Mini LED will be a journey full of hope and challenge, but the sense of mission given to LED and display people by history will inspire us to overcome one Another difficulty! There is no doubt that LED display will usher in a brighter tomorrow.

Post time: Oct-26-2020