A Light Guide Plate That Uses Asymmetric Intensity Distribution of Mini-LEDs for the Planar Illuminator
Zhi-Ting Ye,
Yung-Min Pai,
Cheng-Huan Chen,
Hao-Chung Kuo,
Lung-Chien Chen
Affiliations
Zhi-Ting Ye
Department of Electro-Optical Engineering, National United University, 2, Lienda, Miaoli 26063, Taiwan
Yung-Min Pai
Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Cheng-Huan Chen
Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Hao-Chung Kuo
Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Lung-Chien Chen
Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
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%.
