Industry Analysis | Current Status and Investment Opportunities in Micro LED Development

Industry Development Overview

1. Background and Position of Micro LED

With the rapid rise of new technological revolutions and industrial transformations such as 5G, big data, and artificial intelligence, display applications continue to evolve. As a crucial interface for smart interactions, new display technologies have become the backbone and foundation for supporting emerging industries such as ultra-high-definition video, the Internet of Things, and virtual reality. Consequently, these technologies are emerging as a new battleground in the electronic information industry.

Currently, there are six primary technological routes for new displays: LCD displays, vapor-deposited OLED displays, printed OLED/QLED displays, Micro LED displays, laser displays, and reflective displays. Among them, Micro LED displays are regarded by the industry as the ultimate form of display technology.

2. Definition and Characteristics of Micro LED Displays

Micro LED technology uses micron-sized LEDs as pixel elements, assembled at a micron-level periodicity on a TFT or CMOS backplane to create high-pixel-density LED flat-panel displays. The principle involves thinning, miniaturizing, and arraying LED structures, with sizes ranging from a few microns to several tens of microns. The Micro LED emitting chips are then massively transferred to a TFT or CMOS backplane, with each pixel point controllable and independently driven.

Micro LED displays boast high luminous efficiency, high brightness, short response time, and exceptional reliability. They are recognized as the next-generation display technology following LCD and OLED displays and are considered the ultimate form of display. Since being proposed in 2000, Micro LED has become a critical technological focus in international competition, garnering significant attention from both industry and academia worldwide.

3. Current Status of the Micro LED Industry

In recent years, Micro LED has gained favor among downstream panel manufacturers due to its superior display performance, advancing towards applications in commercial large-scale displays, multifunctional head-mounted, and wearable devices.

According to GGII (GGII LED Research Institute), the global Micro LED market is expected to reach $3.5 billion by 2025 and could hit the $10 billion mark by 2027, driven by technological advancements and cost reductions.

Large-scale Display Market: Micro LED has significant advantages in ultra-large size splicing screen applications, offering high brightness, wide color gamut, and high contrast, which can meet the requirements for outdoor, semi-outdoor, cinema, and large-scale television applications.

Small-scale Display Market: For ultra-small displays, Micro LED primarily targets applications in AR/VR and wearable devices, providing sufficient brightness to counteract ambient light and creating immersive and interactive experiences with ultra-high image resolution.

Investment Insights and Recommendations for Micro LED

1. Development Opportunities in the Micro LED Sector

Looking ahead, there are two primary growth opportunities for the global Micro LED display industry:

Replacement Market for Existing Displays: Compared to the existing mainstream OLED and LCD displays, Micro LED offers advantages such as high luminous efficiency, long lifespan, low power consumption, and all-weather usability. As manufacturing processes mature and product prices decrease, Micro LED is expected to replace OLED and LCD in various domains, including smart TVs, large-screen displays, and outdoor displays, driving expansion in the existing display market. (Large-scale display)

Emerging Market Growth: In terms of new market growth, the micron-sized light source of Micro LED allows for the integration of various functional components into display pixels. Additionally, its capability for three-dimensional light field display and high-precision positioning and sensing offers greater realism, interactivity, and integration. This potential could drive rapid adoption in interactive media industries such as VR/AR devices and in-vehicle displays, expanding the incremental market. (Near-eye display)

2. Technical Challenges Facing Micro LED Development

While Micro LED technology has begun to enter mass production for large-scale displays and wearable watches, achieving large-scale commercial applications will require a prolonged period of refinement.

Large-scale Display Applications: Micro LED faces two critical challenges: mass transfer technology and backplane technology.

A 4K resolution display contains approximately 8 million pixels. Considering RGB independently, over 25 million Micro LEDs need to be transferred. Thus, the efficiency and yield of the transfer technology are crucial to the development of Micro LED.

In terms of mass transfer technology, the industry is exploring high-speed and precise transfer methods. However, each technology has its advantages and disadvantages. As a result, the industry is moving away from focusing on a single transfer technology and considering how to create new transfer techniques that combine strengths from various methods. For example, combining stamp transfer with laser transfer to achieve a balance between efficiency and yield.

For backplane technology, side wiring is required to achieve a seamless splicing effect in Micro LED display manufacturing. This process is complex and significantly reduces the yield of the backplane.

From the perspective of end-product price and quantity, optimizing performance, production efficiency, and cost has yet to support the large-scale application of Micro LED. At present, Micro LED struggles to compete with mainstream display technologies, especially in the large-scale display market, where demand has not yet reached a significant level. For instance, last year, Samsung launched a 110-inch Micro LED TV in China, priced at an astonishing $105,000, while a 4K LCD TV of the same size costs between $1,000 and $5,000. Consequently, this Micro LED TV is more of a novelty for consumers, and the market has not been receptive.

Near-eye Display: The primary challenges for Micro LED in near-eye displays are achieving full color and enabling defect detection and repair.

Currently, Micro LED technology cannot achieve high-brightness full-color displays in applications like AR/VR, where high resolution and color accuracy are essential. Monochrome Micro LED displays only require a flip-chip structure for packaging and bonding with the driver IC, which is relatively simple. However, full-color solutions are more complex, with existing solutions like RGB three-color LED, UV/blue LED plus emissive medium, and lens synthesis, each facing its own limitations. For example, RGB three-color arrays require sequential transfer of red, blue, and green chips. With over 100,000 embedded chips, higher consistency and yield are needed for chip light efficiency and wavelength. Any deviation between actual and theoretical output currents can cause color deviations in the pixels.

In terms of process and materials, the UV/blue LED plus emissive medium method is simpler than other solutions. It primarily uses blue LEDs to replace the backlight panel, with quantum dot film or phosphor serving as the emissive medium instead of RGB filters. Quantum dot films, with particle sizes ranging from 1 to 10 nm, are smaller than phosphor particles. Due to their high absorption-emission efficiency and broad absorption spectrum, they offer higher color purity and saturation, making them a superior technological solution compared to phosphors. After replacing the backlight panel with blue LEDs, the quantum dot film emits pure green and red light under blue light excitation, achieving full-color display.

As quantum dot technology improves, the UV/blue LED plus emissive medium method is expected to become the mainstream technology for full-colorization. Quantum dots also hold significant potential in LCD and OLED technologies, making companies with deep expertise in quantum dots worth monitoring.

Because Micro LED chips are incredibly small, traditional testing equipment is challenging to use. Detecting, repairing, or replacing defective chips among millions or even tens of millions is a significant challenge. Current solutions include photoluminescence testing and electroluminescence testing. Photoluminescence testing uses light sources to excite wafers or solar cells, capturing specific wavelengths of emitted signals for data processing and defect identification. Electroluminescence testing involves detecting defects based on the light emitted when electrons in the chip return to their ground state under a strong electric field.

Investment Opportunities in the Micro LED Sector

The above-mentioned technical challenges are critical barriers to the commercial application of Micro LED, presenting opportunities for start-ups to achieve breakthroughs in key technologies and gain an edge. It is advisable to focus on the following areas of technological progress:

Mass Transfer: Mass transfer technology is a crucial step toward the mass production of Micro LED applications. A breakthrough in this technology will create a broad market for transfer equipment. Additionally, due to the small size of Micro LED, traditional testing and repair equipment is inadequate. Detecting and repairing defective pixels among millions or even tens of millions of chips is a major challenge. Therefore, companies focusing on key equipment and their core components should be closely monitored for the latest technological advancements.

Packaging Processes and Materials: As chips become smaller, packaging processes have undergone significant changes. MIP (Micro LED in Package) packaging, an important technology route alongside COB (Chip on Board), is likely to become a mainstream packaging route due to its high performance and compatibility with existing equipment, thereby promoting the industrialization of Micro LED. Furthermore, new packaging materials that accompany new transfer and packaging technologies, such as underfill adhesives and die-bonding conductive adhesives, are expected to have substantial market opportunities.

Full-colorization: Full-colorization is a core technology for achieving Micro LED displays. The current mainstream methods are RGB LEDs, lens synthesis, and quantum dots, each with its shortcomings. As quantum dot technology matures, quantum dots are expected to become the mainstream technology for full-colorization. Quantum dots also have great potential in LCD and OLED, so companies with strong expertise in quantum dots should be considered.

Backplane Technology: Traditional PCB substrate backlight modules have limitations in thermal performance and cannot be infinitely thin. From the perspective of the core integration process and mass transfer technology of Micro LED, using mature TFT substrates from flat panel displays has a significant advantage in surface smoothness compared to traditional PCB boards, making it more suitable for mass transfer processes.

It is expected that future Micro LED displays will follow three technological paths based on target product display area: silicon-based substrates for AR, LTPS-based TFT substrates (or flexible resin substrates) for handheld, wearable, in-vehicle, IT, and TV, and PCB substrates for traditional large-size engineering displays. Based on these predictions, it is advisable to monitor the latest advancements in silicon-based and TFT substrate technologies and the companies involved.

From the perspective of the competitive landscape across various stages of Micro LED manufacturing, chip miniaturization, panel manufacturing, and application development are progressing faster. Several leading listed companies, including BOE, HC Semitek, and TCL China Star, along with some start-ups, have already made forward-looking deployments, making competition intense. In contrast, mass transfer, packaging, and full-colorization are areas where domestic and international levels still show significant gaps and are considered bottleneck sectors. There is a scarcity of start-ups in these areas, presenting substantial opportunities and market space.

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