Improved Performance of Passive-Matrix Micro-LED Displays Using a Multi-Function Passivation Structure

Improved Performance of Passive-Matrix Micro-LED Displays Using a Multi-Function Passivation Structure

The enhanced light output efficiency of passive-matrix micro light-emitting-diode (LED) display was achieved by employing the tapered sidewalls and distributed-Bragg-reflector (DBR) passivation structure. The oblique angles at the bottom of multi-quantum wall and n-GaN are 48.9° and 21.8&...

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Bibliographic Details
Main Authors: Po-Wei Chen, Po-Wen Hsiao, Po-Chen Shen, Hsuan-Jen Chen, Yi-An Chen, Ray-Hua Horng, Dong-Sing Wuu
Format: Article
Language:English
Published: IEEE 2020-01-01
Series:IEEE Photonics Journal
Subjects:
Passive-matrix
μ-LED
planarization
DBR structure
oblique angles
display
Online Access:https://ieeexplore.ieee.org/document/9117155/
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Summary:The enhanced light output efficiency of passive-matrix micro light-emitting-diode (LED) display was achieved by employing the tapered sidewalls and distributed-Bragg-reflector (DBR) passivation structure. The oblique angles at the bottom of multi-quantum wall and n-GaN are 48.9&#x00B0; and 21.8&#x00B0;, which can favor the planarization structure of pixel interconnection. As increasing the number of DBR (SiO<sub>2</sub>&#x002F;TiO<sub>2</sub>) stacking from 3.5 to 5.5 pairs, the reflectance increased obviously from 81.4&#x0025; to 98.0&#x0025; at the wavelength of 450 nm. As the micro-LED display with a multi-function DBR structure, the output power of 1.07 mW under 1 mA, the external-quantum efficiency of 42&#x0025; under 0.2 mA, and the luminance of 435 nits were obtained.
ISSN:1943-0655

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