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Related Experiment Video

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1.6-Inch Transparent Micro-Display with Pixel Circuit Integrated microLED Chip Array by Misalignment-Free Transfer.

Kyungwook Hwang1, Junsik Hwang1, Yongchan Kim2

  • 1Samsung Advanced Institute of Technology, Suwon, 16678, South Korea.

Advanced Materials (Deerfield Beach, Fla.)
|January 3, 2025
PubMed
Summary
This summary is machine-generated.

Pixel circuit-integrated micro-LEDs (PIMLEDs) overcome integration challenges for next-generation displays. This innovation enables novel transparent and form-factor-free micro-LED displays on glass substrates.

Keywords:
PIMLEDfluidic‐assisted transferform‐factor freefourfold symmetrymicroLED displayvertical integration

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Optoelectronics

Background:

  • Micro light-emitting diode (µLED) displays face integration challenges with active-matrix backplanes.
  • Mass transfer technology is advancing, paving the way for next-generation µLED displays.

Purpose of the Study:

  • To innovate µLED display technology by developing pixel circuit-integrated micro-LEDs (PIMLEDs).
  • To demonstrate the integration of PIMLEDs onto a transparent glass substrate for novel display applications.

Main Methods:

  • Fabrication of PIMLEDs comprising low-temperature poly-silicon transistors and Gallium Nitride (GaN) µLEDs.
  • Design of square-shaped PIMLEDs with four-fold rotational symmetry for improved process margin and bonding alignment.
  • Development of concentric circular pixel electrodes on the substrate to facilitate massive, misalignment-free fluidic transfer.

Main Results:

  • Successful integration of PIMLEDs onto a transparent glass substrate.
  • Demonstration of a 96 × 96 PIMLED display.
  • Vertically integrated pixels exhibited consistent optical and electrical properties across different arrangements.
  • The design ensured compatibility with fluidic transfer and eliminated angular misalignment during wafer bonding.

Conclusions:

  • PIMLEDs offer a viable solution for reliable µLED integration.
  • This technology enables the development of transparent and form-factor-free µLED displays.
  • The demonstrated approach paves the way for advanced display applications.