We discuss state of the art microLED performance for AR and direct view display applications, including a detailed comparison of both InGaN and AlInGaP material systems at various sizes from <2micron to >10micron pixels. In particular, we detail our most recent results on efficiency, gamut coverage, and reliability. We also quantify how sidewall passivation can lead to high IQE for 2 micron scale devices. Further we describe early results for a polychromatic LED demonstration that represents a possible breakthrough display technology.
Widening the range of efficiently emitting wavelengths is a goal of ongoing research on III-nitride LEDs. The so-called green gap is mainly related to the increasing severity of efficiency droop as the wavelength increases. The peak EQE in commercial green LEDs exceeds 60% but corresponds to a very low current density. In this presentation we review challenges in the development of long wavelength III-nitride LEDs. We discuss possible strategies to mitigate droop based on the understanding that nonradiative Auger recombination is the root cause. Finally, we present the current efficiency status of green, yellow and red III-Nitride LEDs.
This paper focuses on micro LED R, G, B emitter technologies for low power wearable displays. Selection of materials, novel micro LED architectures, LED driving schemes, backplanes and their impact on LED performance trade-off will be presented to meet long battery life wearable display requirements. An objective comparison will be presented based on strengths and weaknesses of micro LED technologies for their fit and wide adoption in displays vs. status quo. Micro LED technologies are expected to gain significant adoption in a wide range of wearable display products in near future.
Conference Committee Involvement (7)
Light-Emitting Devices, Materials, and Applications XXIX
27 January 2025 | San Francisco, California, United States
Light-Emitting Devices, Materials, and Applications XXVIII
29 January 2024 | San Francisco, California, United States
Light-Emitting Devices, Materials, and Applications XXVII
30 January 2023 | San Francisco, California, United States
Light-Emitting Devices, Materials, and Applications XXVI
24 January 2022 | San Francisco, California, United States
Light-Emitting Devices, Materials, and Applications XXV
6 March 2021 | Online Only, California, United States
Light-Emitting Devices, Materials, and Applications XXIV
3 February 2020 | San Francisco, California, United States
Light-Emitting Devices, Materials, and Applications
4 February 2019 | San Francisco, California, United States
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