Advances in color-converted micro-LED arrays

Kai-Ling Liang, Wei-Hung Kuo, Hui-Tang Shen, Pei-Wen Yu, Yen-Hsiang Fang, Chien-Chung Lin

Research output: Contribution to journalReview articlepeer-review

3 Scopus citations

Abstract

The development of a full-color micro-display at the Industrial Technology Research Institute (ITRI) was reviewed in this study. The blue micro-display with 960 x 540 pixel arrays and 1984 PPI resolution is demonstrated on a CMOS active matrix addressing circuit. Different methods of fabricating such a micro-panel are developed to overcome the limitation in mass transfer. For the device size ranging from 5-100 micrometers, low-current external quantum efficiency of 10%-14% can be obtained. To achieve a full-color scheme, we adapt color-conversion layer design and use colloidal quantum dots as the illuminating material. A full-color array on a transparent substrate of 170 PPI resolution was demonstrated with a large-area blue LED backlight. The red and green pixels were fabricated by a photolithography process and had a size of 30 mu m. The FWHM of 21 and 28 nm and the quantum yield of 28% and 41% for the green and red pixels, respectively, were measured by a 2D spectroradiometer. With superior color provided by quantum dots, it shows a wide color gamut that can fill 87% of Rec. 2020 color space.

Original languageEnglish
Article number0802
Number of pages9
JournalJapanese journal of applied physics
Volume60
Issue numberSA
DOIs
StatePublished - 1 Jan 2021

Keywords

  • micro-LED
  • full-color
  • quantum dot
  • fine-pitch
  • LIGHT-EMITTING-DIODES
  • DISPLAY
  • EMISSION
  • PHOSPHORS

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