High-Uniformity Planar Mini-Chip-Scale Packaged LEDs with Quantum Dot Converter for White Light Source

Lung Chien Chen*, Ching Ho Tien, De Fu Chen, Zhi Ting Ye, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This study proposes a novel direct-lit mini-chip-scale packaged light-emitting diode (mini-CSPLED) backlight unit (BLU) that used quantum dot (QD) film, diffusion plate, and two prism films to improve brightness uniformity. Three different luminous intensity units, 120° mini-CSPLED, 150° mini-CSPLED, and 180° mini-CSPLED with different emission angle structures were fabricated using a CSP process. In terms of component characteristics, although the 180° mini-CSPLED light output power is about loss 4% (at 10 mA) compared with 150° mini-CSPLED, it has a large emission angle that forms a planar light source that contributes to improving the BLU brightness uniformity and reduced quantity of LEDs at the same area. In terms of BLU analysis, the blue mini-CSPLEDs with different emission angles excite the different QD film thicknesses; the chromaticity coordinates conversion to the white light region. The BLU brightness increases as the QD film thickness increases from 60, 90, and 150 μm. This result can achieve a brightness uniformity of 86% in a 180° mini-CSPLED BLU + 150-μm-thick QD films as compared to the 120° mini-CSPLED BLU and 150° mini-CSPLED BLU.

Original languageEnglish
Article number182
JournalNanoscale Research Letters
Volume14
DOIs
StatePublished - 1 Jan 2019

Keywords

  • Backlight
  • GaN
  • Mini-CSPLED
  • Quantum dot

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