Concurrent self-assembly of RGB microLEDs for next-generation displays

Wonjae Chang (), Jungsub Kim, Myoungsoo Kim, Min Woo Lee, Chung Hyun Lim, Gunho Kim, Sunghyun Hwang, Jeeyoung Chang, Young Hwan Min, Kiseong Jeon, Soohyun Kim, Yoon-Ho Choi and Jeong Soo Lee ()
Additional contact information
Wonjae Chang: LG Electronics
Jungsub Kim: LG Electronics
Myoungsoo Kim: LG Electronics
Min Woo Lee: LG Electronics
Chung Hyun Lim: LG Electronics
Gunho Kim: LG Electronics
Sunghyun Hwang: LG Electronics
Jeeyoung Chang: LG Electronics
Young Hwan Min: LG Electronics
Kiseong Jeon: LG Electronics
Soohyun Kim: LG Electronics
Yoon-Ho Choi: LG Electronics
Jeong Soo Lee: LG Electronics

Nature, 2023, vol. 617, issue 7960, 287-291

Abstract: Abstract MicroLED displays have been in the spotlight as the next-generation displays owing to their various advantages, including long lifetime and high brightness compared with organic light-emitting diode (OLED) displays. As a result, microLED technology1,2 is being commercialized for large-screen displays such as digital signage and active R&D programmes are being carried out for other applications, such as augmented reality3, flexible displays4 and biological imaging5. However, substantial obstacles in transfer technology, namely, high throughput, high yield and production scalability up to Generation 10+ (2,940 × 3,370 mm2) glass sizes, need to be overcome so that microLEDs can enter mainstream product markets and compete with liquid-crystal displays and OLED displays. Here we present a new transfer method based on fluidic self-assembly (FSA) technology, named magnetic-force-assisted dielectrophoretic self-assembly technology (MDSAT), which combines magnetic and dielectrophoresis (DEP) forces to achieve a simultaneous red, green and blue (RGB) LED transfer yield of 99.99% within 15 min. By embedding nickel, a ferromagnetic material, in the microLEDs, their movements were controlled by using magnets, and by applying localized DEP force centred around the receptor holes, these microLEDs were effectively captured and assembled in the receptor site. Furthermore, concurrent assembly of RGB LEDs were demonstrated through shape matching between microLEDs and receptors. Finally, a light-emitting panel was fabricated, showing damage-free transfer characteristics and uniform RGB electroluminescence emission, demonstrating our MDSAT method to be an excellent transfer technology candidate for high-volume production of mainstream commercial products.

Date: 2023
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DOI: 10.1038/s41586-023-05889-w

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