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3200 ppi Matrix-Addressable Blue MicroLED Display.

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This study reports a high-resolution active matrix MicroLED display with 1920 × 1080 resolution. The advanced MicroLEDs demonstrate exceptional efficiency and brightness, enabling high-quality graphic image display.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Display Technology

Background:

  • Micro light-emitting diode (MicroLED) displays offer potential for high resolution and brightness.
  • Achieving high pixel density and excellent electrical characteristics in MicroLEDs remains a challenge.

Purpose of the Study:

  • To report an active matrix (AM) MicroLED display with 1920 × 1080 resolution and 3200 pixels per inch (ppi).
  • To characterize the performance of individual MicroLED pixels, focusing on efficiency, brightness, and wavelength stability.

Main Methods:

  • Fabrication of a 1920 × 1080 MicroLED display using active matrix technology.
  • Characterization of single 5 μm diameter MicroLED pixels, including forward voltage, ideality factor, leakage current, and quantum efficiency.
  • Evaluation of wall-plug efficiency, light output power, and brightness at varying current densities.
  • Analysis of electroluminescent peak wavelength shift with increasing current.
  • Implementation of flip-chip bonding technology for bottom-emitting display fabrication.

Main Results:

  • The MicroLED display achieved a resolution of 1920 × 1080 and a pixel density of 3200 ppi.
  • Individual pixels exhibited a low forward voltage (2.8 V at 4.4 μA), high ideality factor (1.7), and extremely low leakage current (131 fA at -10 V).
  • External quantum efficiency reached 6.5% and wall-plug efficiency was 6.6% at 10.2 A/cm2.
  • Brightness of 1.6 × 105 cd/m2 (nits) was achieved at 1 mA.
  • A minimal blue shift of 6.6 nm in electroluminescent peak wavelength was observed with increasing current density.

Conclusions:

  • The developed active matrix MicroLED display demonstrates high performance suitable for advanced imaging applications.
  • Flip-chip bonding technology enables the creation of high-resolution, bottom-emitting MicroLED displays.
  • The excellent characteristics of the MicroLEDs, including high efficiency and minimal wavelength shift, pave the way for next-generation display technologies.