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Fluidic self-assembly for MicroLED displays by controlled viscosity.

Daewon Lee1, Seongkyu Cho2, Cheolheon Park3

  • 1Department of Electronics Engineering, Myongji University, Yongin-si, Gyeonggi-do, Republic of Korea.

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|July 12, 2023
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Summary
This summary is machine-generated.

Researchers developed a fluidic self-assembly (FSA) technique to rapidly assemble millions of micro light-emitting diode (MicroLED) chiplets for advanced displays. This method overcomes challenges in large-scale chiplet transfer, paving the way for cost-effective MicroLED manufacturing.

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Area of Science:

  • Materials Science and Engineering
  • Optoelectronics
  • Nanotechnology

Background:

  • MicroLED displays offer superior performance over organic LEDs, including better power efficiency, color saturation, brightness, and stability, without image burn-in.
  • Manufacturing MicroLED displays requires transferring millions of microscopic inorganic light-emitting diode (LED) chiplets onto a display substrate.
  • Current methods face challenges in achieving the high throughput and low cost necessary for commercializing MicroLED technology due to the vast number of chiplets involved.

Purpose of the Study:

  • To develop a cost-effective, high-throughput technique for assembling large quantities of MicroLED chiplets.
  • To demonstrate the feasibility of fluidic self-assembly (FSA) for fabricating MicroLED lighting panels.
  • To address the challenges associated with the low inertia of sub-100-μm chiplets during self-assembly.

Main Methods:

  • A novel agitation-based, surface-tension-driven fluidic self-assembly (FSA) technique was employed.
  • Disk-shaped Gallium Nitride (GaN) chiplets, 45 μm in diameter and 5 μm thick, were used.
  • The addition of poloxamer to the assembly solution was investigated to enhance liquid-to-chiplet momentum transfer by increasing viscosity.

Main Results:

  • Over 19,000 GaN chiplets were successfully assembled into a MicroLED lighting panel in just 60 seconds.
  • The FSA technique achieved an exceptionally high yield of 99.88% for large-scale chiplet assembly.
  • Increasing solution viscosity with poloxamer effectively improved momentum transfer, overcoming the challenge of low chiplet inertia.

Conclusions:

  • Fluidic self-assembly (FSA) presents a viable solution for the low-cost, high-throughput manufacturing of MicroLED displays.
  • The developed method demonstrates significant progress towards overcoming key manufacturing hurdles for MicroLED technology.
  • This advancement is crucial for the commercialization of high-performance MicroLED displays.