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Crystals 2019, 9(3), 141; https://doi.org/10.3390/cryst9030141

A Light Guide Plate That Uses Asymmetric Intensity Distribution of Mini-LEDs for the Planar Illuminator

1
Department of Electro-Optical Engineering, National United University, 2, Lienda, Miaoli 26063, Taiwan
2
Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
3
Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
*
Authors to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 19 February 2019 / Accepted: 5 March 2019 / Published: 8 March 2019
(This article belongs to the Special Issue GaN-Based Optoelectronic Materials and Light Emitting Devices)
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Abstract

Traditional backlights are designed with new dot patterns, and then injection molding, laser beam fabrication, or UV (Ultraviolet) roll-to-plate imprinting is used to apply dot patterns to a light guide plate—the process consumes considerable time and resources. Therefore, we propose a novel light guide design that does not use a dot pattern. We designed an asymmetric intensity distribution of mini-LEDs (Light Emitting Diode) and a light guide plate with a fully printed diffusion reflection on the bottom surface for a planar illuminator. The design rules for the proposed architecture are described in this paper. The archetype design with a 152.4 mm circular down-light has a diameter of 143 mm for the planar light source module. The experiment achieved a total efficiency of 85% and uniformity of 92.6%. View Full-Text
Keywords: planar illuminators; diffusion reflection; asymmetric; mini-LED; asymmetric intensity distribution planar illuminators; diffusion reflection; asymmetric; mini-LED; asymmetric intensity distribution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ye, Z.-T.; Pai, Y.-M.; Chen, C.-H.; Kuo, H.-C.; Chen, L.-C. A Light Guide Plate That Uses Asymmetric Intensity Distribution of Mini-LEDs for the Planar Illuminator. Crystals 2019, 9, 141.

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