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Session 52 :
High Efficiency MicroLEDs
Emissive, Micro-LED, and Quantum-Dot Displays

Thursday, May 16 / 09:00 AM   - 10:20 AM / San Jose Convention Center, 220C

Chair:
Qun Yan, Fuzhou University, Wallkill, NY US

Co-Chair:
Francois Templier, CEA-LETI, Grenoble, France

52.1 - Invited Paper: Striving Toward All-InGaN Sub-2µm RGB MicroLEDs (9:00 AM - 9:20 AM)
  • Lars Samuelson
    Southern University of Science and Technology & Lund University & Hexagem AB Lund Sweden


  • The large lattice mismatch between red-emitting active layers and the GaN substrate limits efficiencies to very low values. The efficiency of GaAs-based (GaAs/AlInGaP) microLEDs even further decreases for AR applications as pixel sizes go down to 2 mm. The concept of realizing relaxed templates of InGaN on top of which are formed sub-µm size nanoLEDs will be introduced.
05/16/2024 9:00 AM 05/16/2024 9:20 AM America/Los_Angeles Striving Toward All-InGaN Sub-2µm RGB MicroLEDs The large lattice mismatch between red-emitting active layers and the GaN substrate limits efficiencies to very low values. The efficiency of GaAs-based (GaAs/AlInGaP) microLEDs even further decreases for AR applications as pixel sizes go down to 2 mm. The concept of realizing relaxed templates of InGaN on top of which are formed sub-µm size nanoLEDs will be introduced. San Jose McEnery Convention Center 220C Lars Samuelson
52.2 - Invited Paper: 1µm Nanowire-Based MicroLED Chips For Efficient and High-Performance Smartwatch Displays (9:20 AM - 9:40 AM)
  • Ivan-Christophe Robin, Pierre Thulian, Thomas Sannicolo, Yoann Malier, Xavier Hugon, Philippe Gilet
    ALEDIA SAS Echirolles France


  • Aledia's nanowire microLED technology on 8-in. silicon wafers maintains efficiency across device sizes, from a single nanowire to hundreds. This uniformity in efficiency and electro-optical parameters could enable cost-effective, energy-efficient smartwatch displays. The technology features a 3% wafer-level wall-plug efficiency deviation and a minimal 1.5nm wavelength variation, supporting efficient micron-sized microLED manufacturing.
05/16/2024 9:20 AM 05/16/2024 9:40 AM America/Los_Angeles 1µm Nanowire-Based MicroLED Chips For Efficient and High-Performance Smartwatch Displays Aledia's nanowire microLED technology on 8-in. silicon wafers maintains efficiency across device sizes, from a single nanowire to hundreds. This uniformity in efficiency and electro-optical parameters could enable cost-effective, energy-efficient smartwatch displays. The technology features a 3% wafer-level wall-plug efficiency deviation and a minimal 1.5nm wavelength variation, supporting efficient micron-sized microLED manufacturing. San Jose McEnery Convention Center 220C Ivan-Christophe Robin, Pierre Thulian, Thomas Sannicolo, Yoann Malier, Xavier Hugon, Philippe Gilet
52.3 - Enhancing MicroLED Display Efficiency with Reduced Ambient Light Reflectance (9:40 AM - 10:00 AM)
  • Yu-Hung Tsai, Hoang-Yan Lin, Mao-Kai Huang, Yuan-Zhen Zhuang
    National Taiwan University Taipei Taiwan Roc

  • Yu-Hsin Huang, Kuan-Heng Lin
    AU Optronics Corp. Hsinchu Taiwan Roc


  • Shrinking LEDs reduces internal quantum efficiency (IQE) and challenges light extraction. LightTools is used for geometric optical simulations to design a secondary optical structure with reflector and a black matrix, enhancing microLED light-extraction efficiency. This approach significantly reduces light emission loss from 40% to 4.54%, and ambient light reflection from 25% to 4.85%.
05/16/2024 9:40 AM 05/16/2024 10:00 AM America/Los_Angeles Enhancing MicroLED Display Efficiency with Reduced Ambient Light Reflectance Shrinking LEDs reduces internal quantum efficiency (IQE) and challenges light extraction. LightTools is used for geometric optical simulations to design a secondary optical structure with reflector and a black matrix, enhancing microLED light-extraction efficiency. This approach significantly reduces light emission loss from 40% to 4.54%, and ambient light reflection from 25% to 4.85%. San Jose McEnery Convention Center 220C Yu-Hsin Huang, Kuan-Heng Lin
52.4 - MicroLED Display Light-Extraction Efficiency Improvement by Secondary Optics on Substrate (10:00 AM - 10:20 AM)
  • Yang-En Wu
    AUO Corporation & National Yang Ming Chiao Tung University Hsinchu Taiwan Roc

  • Jia-Hao Hsu, Kuan-Hsun Chen, Kun-Cheng Tien
    AUO Corporation Hsinchu Taiwan Roc

  • Hao-Chung Kuo
    National Yang Ming Chiao Tung University Hsinchu Taiwan Roc


  • MicroLED is a widely acclaimed potential future display. The light-extraction efficiency of a microLED device deteriorates due to device size reduction. This paper illustrates several concepts to improve the normal-angle light intensity. When the authors consider overall display performance, including surface reflection and half brightness angle, they simulate a condition that can improve the normal-angle light intensity over 70%. The authors also prepare samples to confirm that the white glue layer can improve over 100%, and a lens with a protection layer also can improve 45% for normal-angle light intensity
05/16/2024 10:00 AM 05/16/2024 10:20 AM America/Los_Angeles MicroLED Display Light-Extraction Efficiency Improvement by Secondary Optics on Substrate MicroLED is a widely acclaimed potential future display. The light-extraction efficiency of a microLED device deteriorates due to device size reduction. This paper illustrates several concepts to improve the normal-angle light intensity. When the authors consider overall display performance, including surface reflection and half brightness angle, they simulate a condition that can improve the normal-angle light intensity over 70%. The authors also prepare samples to confirm that the white glue layer can improve over 100%, and a lens with a protection layer also can improve 45% for normal-angle light intensity San Jose McEnery Convention Center 220C Hao-Chung Kuo