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On the first day of TrendForce’s new display industry seminar, experts in the LED and display fields shared their views on micro-display and small and medium-sized display technologies. Entering the second day, the topic of the conference turned to ultra-large size and ultra-high-definition display technology. 12 industry experts and senior analysts gathered together to conduct in-depth discussions on issues related to the ultra-large size and ultra-high definition industry.

Technological Evolution and Application Innovation of Micro LED Display

Qiu Yubin, Senior Vice General Manager of Research, TrendForce Technology

After entering the commercialization stage from laboratory technology, the current development focus of Micro LED display technology is more focused on specific goals such as optimization of design and manufacturing, finding niche markets, development of new applications, and expansion of market scale.

For large displays, enlarging the size of the backplane to reduce the need for additional processes for splicing and side wires is another option to reduce costs and improve overall production yield. Although wearable applications currently lack the driving force of mainstream brands, Micro LED is still unique as the only display technology that can be highly integrated with sensing components. Automotive and near-eye displays are the next application tracks targeted by glass-based and silicon-based Micro LEDs. The former is expected to generate an output value of more than US$100 million for chips in 2028, while the latter is expected to have a penetration rate of 50% in all AR glasses in the medium to long term.

In summary, leveraging the unique advantages of Micro LED display such as flexibility, transparency, and invisibility to find niche applications is the necessary means to differentiate this technology from mainstream solutions. In addition, Micro LED is used in optical communications, biomedicine Non-display fields such as medical treatment and industrial production are also gradually expanding. It is also another important way to expand the scale of market economy and diversify applications.

Meet the future, the development of Guoxian New Display

Fu Yaosheng, Director of Guoxian Technology Research Institute

As cars evolve into a human-centered "third living space", the interaction between the car and the driver gradually expands to include intelligent driving and entertainment information. The intelligent upgrade of the cockpit promotes screen innovation. With high-brightness Mini LED technology as the core, Guoxian Technology has developed a variety of new display technology applications such as HUD PGU, air imaging, light field screens and wood grain screens.

As an important means of displaying driving information, HUD technology has developed from traditional C-HUD to W-HUD, and gradually evolved to AR-HUD. High-brightness Mini LED backlight technology can effectively solve the shortcomings of existing TFT in AR-HUD PGU. On this basis, Guoxian Technology developed HUD PGU and primary and secondary mirror solutions.

Air imaging technology is widely used in information security, medical display, smart vehicle and other fields. Guoxian Technology provides high-brightness Local Dimming Mini LED backlight LCD modules, paired with high-resolution negative refractive glass to achieve precise spatial imaging. The imaging angle can be adjusted according to needs, suitable for vehicles Display, smart home, education and high-end consumer products.

Light field screen technology breaks through the limitations of physical space in the car and can be widely used in cockpit holographic entertainment screens, vision protection learning machines and consumer-grade large-screen displays. Intelligent wood grain surface display technology integrates the luxurious atmosphere design of car interiors, upgrading wood grain decorations from simple decorative elements to innovative applications with intelligent display and control functions.

Guoxian Technology was founded in 2006. Through joint reorganization in 2015, it became a holding subsidiary of Triumph Technology Co., Ltd., a listed company under the central enterprise China National Building Materials Group. It is an innovative technology enterprise that provides display solutions and services globally. Currently, the company has intelligent manufacturing bases in Shenzhen, Bengbu, and Nanjing.

Application and future trends of LED display and control systems

Lin Xianmeng Nova Nebula Laboratory Director, Academia Sinica

The continued penetration of MLED technology in application fields such as xR virtual shooting, cinema screens, vehicle displays, and televisions is promoting the continuous upgrading of new display experiences for users. In the process, display control systems have become new amplifiers of display value.

Based on years of deep cultivation in the field of display control systems, Nova Nebula has developed a series of advanced display control system related technologies, including ultra-large load controller, multiple backup technology, fault monitoring and early warning technology, full system synchronization technology for display and shooting, high image quality and color perception processing technology, as well as fast screen configuration and scene switching technology. With these technologies, Nova Nebula has successfully helped create a number of landmark projects.

Currently, Nova Nebula is fully focusing on the five key display technology groups and smart display technology groups: grayscale resolution, time resolution, spatial resolution, dynamic range and color gamut range, and is committed to promoting the continuous improvement of display performance through technological innovation. The company continues to develop new technologies, aiming to further improve the comprehensive value of the display screen, and also lay a solid foundation for the accelerated arrival of the MLED era.

T Progress in productization of FT-based Micro-LED splicing screens

Cao Xuan Chenxian Optoelectronics Deputy General Manager & CTO

The market prospects for large-size display products continue to be promising, and they are widely used in command and dispatch, conference training, advertising and other scenarios. However, existing large-size display technology has three major pain points: low image quality, patchwork, and lack of eye protection. TFT-based Micro LED display has unique advantages in large-size display applications. It can provide the ultimate picture quality and bring a theater-level viewing experience; the splicing effect is seamless, more comfortable, eye-friendly, and user-friendly.

However, in the manufacturing process of TFT-based Micro LED splicing displays, LED chip performance, array characteristics of mass transfer technology, and fragile substrates have a certain impact on the overall performance of the product. Its mass production faces four major problems: poor uniformity, frequent bad pixels, visible splicing seams, and split-screen viewing angles.

Chenxian Optoelectronics ensures pixel-level image quality uniformity through the world's first hybrid Bin+Demura solution; its efficient multiple repair technology ensures zero defects on the screen; the integrated splicing solution achieves seamless splicing and nearly traceless visual fusion; at the same time, the Micro-Lens structural design reshapes the luminous angle to ensure This proves the consistency of the picture under large viewing angles. As technical difficulties are overcome, Chenxian Optoelectronics will next focus on collaborative cost reduction along the industry chain and promote high-quality and low-cost TFT-based Micro LED splicing display products to the market.

Founded on August 4, 2020, Chenxian Optoelectronics originated from Visionox. It is the first high-tech enterprise in mainland China to focus on independent research and development, production and sales of Micro LED. The goal is to become the leader of TFT-based Micro-LED. The company has two smart factories: the VSD pilot line is used for technology research and development and testing, and the VSM mass production line is used for large-scale production.

New Future of LED Display Chips

Xiang Qidi, Head of Direct Display Sales, BOE Huacan Optoelectronics

As a new generation of display technology, Mini LED and Micro LED have made LED displays superior to traditional LCD technology in terms of display effect, power consumption and lifespan. At the same time, relying on policy support and market demand, the innovation and application of LED display technology has developed rapidly, and its application scenarios are expanding from traditional fields to emerging fields, such as LED all-in-one machines, virtual shooting, cinemas, etc.

LED display technology is changing from "point light source" to "area light source", promoting the application of COB and MIP technology in the small and micro-pitch markets. The Mini LED market will continue to expand, especially in the fields of high-resolution, fine-pitch and ultra-high-definition displays. Micro LED technology, known as the "ultimate display solution", will play an increasingly important role in many fields such as large indoor displays, HUDs, matrix lights, smart watches, AR/VR glasses and TVs.

In terms of LED display chip product solutions, BOE Huacan Optoelectronics has launched Human Centric True Color, specially designed for high-end Color gamut and HDR content creation and design aim to pursue and restore the authenticity of image display colors and improve terminal display effects. F07E-BE is the first product in this series, with the advantages of high color gamut, high image quality, high quality, and low power consumption.

In addition, the Micro Pixel Device platform, as a new generation of display technology, has comprehensively improved display performance and customer ease of use. MU300 and MU200 are currently the best implementation solutions in the field of micro-pitch and are also one of the main products of the HC True Color series. Known as the "ultimate display technology", Micro MPD has the advantages of ultra-high contrast, optimal white flat viewing angle, improved die-bonding efficiency, yield, and micro-pitch applications. Currently, the HC True Color series of products are still under continuous development.

BOE Huacan Optoelectronics' technical advantages and resource integration are constantly strengthening, especially its strategic layout in the Micro LED field. The Micro LED wafer manufacturing and packaging testing base built by BOE Huacan in Zhuhai is the world's first 6-inch large-scale mass production line. As the world's leading R&D and production base, it further promotes the large-scale application of Micro LED technology and assists the rapid development of the industry.

The development direction of Mini LED TV is industrialization and commercialization

Liao Yansuo Zhaochi Guangyuan Product Director

The shipment volume of Mini LED backlight products in the TV market is increasing year by year, especially in the high-end market. With its advantages such as high contrast, high brightness and low power consumption, it has gradually become a strong competitor of OLED. In the future, Mini LED technology will gradually penetrate into the mid- to low-end markets through technological innovation and cost optimization to meet the needs of more consumers.

Zhaochi Optoelectronics has proposed three major market strategies: the high-end market focuses on high-quality products with more than 3000 partitions; the mid-range market focuses on high-performance products with 500-2000 partitions, lowering the threshold standards and promoting the popularization of Mini LED technology; and the cost-effectiveness focuses on 100-500 partitions to meet the dual needs of mass consumers in terms of cost and performance.

In terms of the path of industrialization and commercialization, the lower consumption threshold needs to be lowered in the sinking market, and the cost-effectiveness advantage can be obtained in exchange for sales volume, so as to win the future with the advantage of scale. Specific measures include: in terms of LED design, reducing costs by expanding chip area, increasing power, reducing the number of chips, and increasing chip spacing; secondary optical design needs to be matched with large-angle chips and adjusted according to the light emission angle. The entire OP value; PCB boards reduce costs by optimizing area, improving single board utilization and reducing precision requirements; driver chips are developing in the direction of high voltage, high current and multi-channel to meet the performance needs of Mini LED TVs.

In the field of Mini LED backlight, Zhaochi Optoelectronics has the advantage of vertical integration. Among them, the upstream Zhaochi Semiconductor has achieved a monthly production and sales scale of 1.1 million 4-inch wafers, which has provided great assistance to Zhaochi Optoelectronics to develop the market. Currently, Zhaochi Optoelectronics has 100 SMT production lines in Mini LED, taking the leading position in the industry; its product layout includes formal products, flip-chip products and Mini products.

The development trend of MLED direct display large screen from technology to scene

Lu Zhenghua, Deputy General Manager of Skyworth Commercial

The development direction of MLED direct display large screens is mainly reflected in LED modules, display panels and complete systems. In terms of LED modules, Skyworth Commercial launched the Black Domain S series SCOB packaging technology and 4in1 aluminum alloy bracket to improve panel consistency, contrast, refresh rate, and optimize energy consumption. The development trend of the whole machine system is de-engineering, standardization, intelligence and integration.

In terms of audio-visual perception, the development trend of MLED direct display large screens can be summarized as "good-looking, good-sounding, and easy to use." Good-looking: Hardware and adjustment ensure basic display capabilities, and Skyworth AI image quality engine improves image quality performance through full-frame and full-scene detection. Good sounding: Teana panoramic sound system has built-in two-way high-fidelity speakers and independent cavity design to ensure clear and true sound quality. Easy to use: It has functions such as versatile desktop and multi-modal interaction. At the same time, it develops Kukai AI agents to realize various AI functions through voice.

In terms of scene applications, MLED direct display large screens are gradually expanding into diverse fields such as office meetings, exhibitions, and audio-visual entertainment. In office meeting scenarios, Skyworth Commercial uses functions such as wireless screen projection and touch annotation. can improve meeting efficiency. In the exhibition display scene, the Xiaowei broadcast control system is used to link the display devices, making content interaction on the MLED large screen more convenient and bringing an immersive intelligent experience. In the audio-visual entertainment scene, large-screen games, karaoke parties and movie viewing functions are combined with handle and audio linkage to meet family entertainment needs.

The password to unlock the visual feast through display color calibration

Ruan Shian, Director of MLED Vision and Image Research Center, Kallet

MLED screens have a variety of color problems in practical applications, including inconsistent brightness and color, low gray pitting and IC color blocks, regional color casts caused by cold and hot screens, temperature drift, gray jumps and color casts, nonlinear photoelectric response characteristics, difficulty in processing and manufacturing quality control, and difficulty in controlling ink color consistency, etc. These problems affect the visual effect of the display, especially in demanding application scenarios.

To solve these problems, Colorlight has launched an MLED color calibration solution. The core of the solution is the scientific-grade calibration system CCM6000, which includes scientific-grade calibration cameras and professional calibration software Calibration Pro. CCM6000 is equipped with a 16-bit high-precision photosensitive chip and a constant temperature cooling system, which can achieve high-precision calibration of brightness ±1% and chromaticity ±0.003. It also supports full grayscale calibration and can complete 4K calibration in 8 minutes, greatly improving calibration efficiency.

In terms of equipment, Colorite has launched the production line automatic correction equipment Mica310 and the ink color sorting equipment Mica310B. Mica310 has high precision, fast calibration and good compatibility, which can be implemented Now managing the whole process from production to on-site; Mica310B supports ink color sorting of PCB and MLED finished light panels, with a production capacity of up to 220PCS/H.

Currently, MLED calibration technology has been widely used in on-site calibration, factory cabinet calibration and module automation production lines.

Digital Cinema LED Projection Technology and Market Outlook

Dong Zhigang, General Manager of Cinema Business Unit, UniMing Group

To achieve high technical indicators, the digital movie LED projection system must not only have the high display performance and hardware security indicators of the LED display itself, and complete full-screen color management, but also need to cooperate with the digital movie playback server to achieve real-time decoding and playback of digital movie data packets, thereby completing high-speed data transmission.

Digital movie LED projection systems are used in LED cinemas, sound-transparent LED cinemas, immersive cinemas, dome cinemas, AI spiritual realm cinemas, e-sports cinemas, etc. Unilumin Technology has provided related products to movie theaters in Beijing, Xinjiang, Chengdu, Wuhan, Zhejiang and other places as well as the United States, and launched the world's first 20-meter 4K sound-transparent movie screen, which was used in Nanjing Deji Plaza Cinema.

In terms of digital movie LED projection sound reproduction technology, due to the structural characteristics of the LED screen, the main speaker cannot be installed behind the screen like a traditional screen. Therefore, special sound reproduction technology is needed to solve the problem of sound image deviation and sound quality. The main technical means include sound image and wave field synthesis method, sound wave reflection method, and screen sound transmission method. Among them, the design of sound-transparent LED screens has become the key. Specific plans include Partial opening sound-transmitting solution, full-screen opening sound-transmitting solution.

With the continuous upgrade of DCI standards, LED projection systems are developing towards higher resolution and higher dynamic range. Technological innovation focuses on sound hole optimization and intelligent system management. In the future, the color gamut is expected to be expanded to BT-2020 to support higher color depth. With the support of national policies, the future development prospects of the LED movie screen market will be very broad.