A Review on Micro-LED Display Integrating Metasurface Structures

Liu, Z. S.; Ren, Kailin; Dai, Gaoyu; Zhang, Jianhua

doi:10.3390/mi14071354

Cited by 14 publications

(10 citation statements)

References 50 publications

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“…Envisioned micro-LED display involving CC-QDs consists of an array of micron-sized light-emitting elements. Each element as an optoelectronic unit should approach an ideal monochromatic emission unit with a high efficiency [126], high color purity [134,135], negligible crosstalk and light leakage among adjacent elements [118,136], and good collimation to enhance visual resolution. The fabrication of micron-scale blue InGaN LED arrays is a contemporary issue with a focus on electrical passivation [137] and optical isolation [126] of micro-LED sidewalls.…”

Section: Current and Future Challengesmentioning

confidence: 99%

“…Using blue-light absorption filler including black matrix has also been reported [154] to improve the color purity. Pixelated arrays also require photonic control in collimation, polarization, and possibly focusing of each pixel; photonic engineering involving micro-lens [136], DBR [155] and metasurfaces [134,135] will need to be applied based on specific use cases.…”

Section: Advances In Science and Technology To Meet Challengesmentioning

confidence: 99%

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The micro-LED roadmap: status quo and prospects

Lin,

Wu,

Kuo

et al. 2023

J. Phys. Photonics

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Micro LED can play an important role in the future generation of smart displays. They are found very attractive in many applications, such as maskless lithography, biosensor, AR/MR etc., at the same time. A monitor that can fulfill saturated color rendering, high display resolution, and fast response time is highly desirable, and the micro LED-based technology could be our best chance to meet these requirements. At present, semiconductor-based RGB micro LED chips and color-conversion enhanced Micro LEDs are the major contenders for the full-color high resolution displays. Both of the methods need revolutionary ways to perfect the material qualities, fabricate the device, assemble the individual parts into a system. In this roadmap, we will highlight the current status and challenges of the micro LED-related issues, and discuss the possible advances in science and technology that can stand up to the challenges. The innovation in epitaxy, such as the tunnel junction, the direct epitaxy and nitride based quantum wells for red and ultraviolet, can provide critical solutions of the micro LED performance in various aspects. The quantum scale structure like nanowire or nanorod can be crucial for the scaling of the devices. Meanwhile, the color conversion method, which uses colloidal quantum dots as the active material, can provide a hassle-free way to assemble a large micro LED array, and emphasis on the full color demonstration via colloidal quantum dots. These quantum dots can be patterned by porous structure, inkjet or photo-sensitive resin. In addition to the micro LED devices, the peripheral components or technologies are equally important. Microchip transfer and repair, heterogeneous integration with the electronics and the novel 2D material cannot be ignored or the overall display module will be very power-consuming. The augmented reality is one of the potential customer for our micro-LED displays and the user experience so far is limited due to lack of the truly qualified display. Our analysis showed the micro LED is on the way to address and solve the current problems, such as high loss optical coupling and narrow field of view. All these efforts are channeled to achieve an efficient display with all ideal qualities that meet our most stringent viewing requirements and expect it to become an indispensable part of our daily life.

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Section: Current and Future Challengesmentioning

confidence: 99%

Section: Advances In Science and Technology To Meet Challengesmentioning

confidence: 99%

The micro-LED roadmap: status quo and prospects

Lin,

Wu,

Kuo

et al. 2023

J. Phys. Photonics

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“…Displays composed of micro-light-emitting diodes (Micro-LEDs) are regarded as promising nextgeneration self-luminous screens and have advantages such as high brightness, high color purity, long lifetime [1][2][3] . In contrast to the Organic Light Emitting Diode (OLED) display depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Contact Performance of High-Brightness Micro- LEDs via ITO/Al Anode Stack and Annealing Process

Meng,

Lu,

Wang

et al. 2024

Preprint

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Micro-light-emitting diodes (Micro-LEDs) are a new type of display device based on the third-generation semiconductor gallium nitride (GaN) material which stands out for its high luminous efficiency, elevated brightness, short response times, and high reliability. The contact between anode layers and P-GaN is one of the keys to improving the performance of the devices. This study investigates the impact of electrode structure design and optimized annealing conditions on the anode contact performance of devices. The Micro-LED device with the size of 9.1μm whose electrode structure is ITO/Ti/Al/Ni/Cr/Pt/Au (100/50/350/100/500/500/5000Å) exhibits a significant improvement in contact performance after annealing under the Ar gas atmosphere at 500° C for 5 minutes. The optimized device exhibited a current of 10.9mA and a brightness of 298628cd/m2 under 5V.

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“…This technology is particularly suited for applications requiring high color accuracy and wide color gamuts, such as professional-grade displays and high-end consumer electronics. Although traditional micro-LED technology performs well in brightness and energy efficiency, it may not reach the high standards of color purity and consistency offered by RCLEDs [ 2 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

InGaN blue resonant cavity micro-LED with RGY quantum dot layer for broad gamut, efficient displays

Lee,

Huang,

Hung

et al. 2024

Discover Nano

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The technology of RGBY micro resonant cavity light emitting diodes (micro-RCLEDs) based on quantum dots (QDs) is considered one of the most promising approaches for full-color displays. In this work, we propose a novel structure combining a high color conversion efficiency (CCE) QD photoresist (QDPR) color conversion layer (CCL) with blue light micro RCLEDs, incorporating an ultra-thin yellow color filter. The additional TiO2 particles inside the QDPR CCL can scatter light and disperse QDs, thus reducing the self-aggregation phenomenon and enhancing the eventual illumination uniformity. Considering the blue light leakage, the influences of adding different color filters are investigated by illumination design software. Finally, the introduction of low-temperature atomic layer deposition (ALD) passivation protection technology at the top of the CCL can enhance the device's reliability. The introduction of RGBY four-color subpixels provides a viable path for developing low-energy consumption, high uniformity, and efficient color conversion displays.

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A Review on Micro-LED Display Integrating Metasurface Structures

Cited by 14 publications

References 50 publications

The micro-LED roadmap: status quo and prospects

The micro-LED roadmap: status quo and prospects

Enhanced Contact Performance of High-Brightness Micro- LEDs via ITO/Al Anode Stack and Annealing Process

InGaN blue resonant cavity micro-LED with RGY quantum dot layer for broad gamut, efficient displays

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