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

Po-Wei Chen; Po-Wen Hsiao; Po-Chen Shen; Hsuan-Jen Chen; Yi-An Chen; Ray-Hua Horng; Dong-Sing Wuu

doi:10.1109/JPHOT.2020.3002554

IEEE Photonics Journal (Jan 2020)

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

Po-Wei Chen,
Po-Wen Hsiao,
Po-Chen Shen,
Hsuan-Jen Chen,
Yi-An Chen,
Ray-Hua Horng,
Dong-Sing Wuu

Affiliations

Po-Wei Chen: ORCiD; Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan
Po-Wen Hsiao: Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan
Po-Chen Shen: Epileds Technologies, Incorporated, Tainan, Taiwan
Hsuan-Jen Chen: Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan
Yi-An Chen: Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan
Ray-Hua Horng: ORCiD; Department of Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan
Dong-Sing Wuu: ORCiD; Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taiwan

DOI: https://doi.org/10.1109/JPHOT.2020.3002554
Journal volume & issue: Vol. 12, no. 4
pp. 1 – 11

Abstract

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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°, which can favor the planarization structure of pixel interconnection. As increasing the number of DBR (SiO2/TiO2) stacking from 3.5 to 5.5 pairs, the reflectance increased obviously from 81.4% to 98.0% 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% under 0.2 mA, and the luminance of 435 nits were obtained.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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