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Volume 13
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10.3390/mi13081326
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Article

Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source

by
Yen-Lung Chen
1,
Wen-Chung Chin
2,
Chun-Wei Tsai
3,
Chang-Che Chiu
4,
Ching-Ho Tien
5,
Zhi-Ting Ye
4,* and
Pin Han
1,*
1
Graduate Institute of Precision Engineering, National Chung Hsing University, Taichung 402, Taiwan
2
Department of R&D Center, TOP RAYS Co., Ltd., Taichung 402, Taiwan
3
Department of R&D Center, i-Wavefront Technology Ltd., New Taipei City 231625, Taiwan
4
Department of Mechanical Engineering, Advanced Institute of Manufacturing with High-Tech Innovations, National Chung Cheng University, Taichung 402, Taiwan
5
Department of Electronic Engineering, Lunghwa University of Science and Technology, Taoyuan 333326, Taiwan
*
Authors to whom correspondence should be addressed.
Micromachines 2022, 13(8), 1326; https://doi.org/10.3390/mi13081326
Submission received: 16 July 2022 / Revised: 14 August 2022 / Accepted: 14 August 2022 / Published: 16 August 2022
(This article belongs to the Special Issue Advanced Technologies in Electronic Packaging)
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Abstract

This report outlines a proposed method of packaging wide-angle (WA) mini-light-emitting diode (mini-LED) devices without optical lenses to create a highly efficient, ultrathin, flexible planar backlight for portable quantum dot light-emitting diode (QLED) displays. Since the luminous intensity curve for mini-LEDs generally recommends a beam angle of 120°, numerous LEDs are necessary to achieve a uniform surface light source for a QLED backlight. The light-guide layer and diffusion layer were packaged together on a chip surface to create WA mini-LEDs with a viewing angle of 180°. These chips were then combined with a quantum dot (QD) film and an optical film to create a high-efficiency, ultrathin, flexible planar light source with excellent color purity that can be used as a QLED display backlight. A 6 in (14.4 cm) light source was used as an experimental sample. When 1.44 W was supplied to the sample, the 3200-piece WA mini-LED with a flexible planar QLED display had a beam angle of 180° on the luminous intensity curve, a planar backlight thickness of 0.98 mm, a luminance of 10,322 nits, and a luminance uniformity of 92%.
Keywords: wide angle; mini-light-emitting diodes; flexible; luminous intensity curve; QLED display wide angle; mini-light-emitting diodes; flexible; luminous intensity curve; QLED display
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MDPI and ACS Style

Chen, Y.-L.; Chin, W.-C.; Tsai, C.-W.; Chiu, C.-C.; Tien, C.-H.; Ye, Z.-T.; Han, P. Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source. Micromachines 2022, 13, 1326. https://doi.org/10.3390/mi13081326

AMA Style

Chen Y-L, Chin W-C, Tsai C-W, Chiu C-C, Tien C-H, Ye Z-T, Han P. Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source. Micromachines. 2022; 13(8):1326. https://doi.org/10.3390/mi13081326

Chicago/Turabian Style

Chen, Yen-Lung, Wen-Chung Chin, Chun-Wei Tsai, Chang-Che Chiu, Ching-Ho Tien, Zhi-Ting Ye, and Pin Han. 2022. "Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source" Micromachines 13, no. 8: 1326. https://doi.org/10.3390/mi13081326

APA Style

Chen, Y.-L., Chin, W.-C., Tsai, C.-W., Chiu, C.-C., Tien, C.-H., Ye, Z.-T., & Han, P. (2022). Wide-Angle Mini-Light-Emitting Diodes without Optical Lens for an Ultrathin Flexible Light Source. Micromachines, 13(8), 1326. https://doi.org/10.3390/mi13081326

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