Optical performance of local dimming backlight unit based on Mini-LED sources

Ju GUO; Qiong-xin SHEN; Zong-zhao JIANG; En-guo CHEN; Tai-liang GUO

doi:10.37188/CJLCD.2021-0045

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Optical performance of local dimming backlight unit based on Mini-LED sources

Device Physics and Device Preparation | 更新时间：2021-07-13

- Optical performance of local dimming backlight unit based on Mini-LED sources
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 7, Pages: 939-946(2021)
- 作者机构：
  
  福州大学物理与信息工程学院闽都创新实验室, 福建福州 350016
- 作者简介：
- 基金信息：
  
  Science and Technology Projects of Fujian Province(2020H4021);Fuzhou Science and Technology Bureau(2020-Z-14);Project from Mindu Innovation Laboratory(2020ZZ111)
- DOI：10.37188/CJLCD.2021-0045
  CLC： O482.31;TN383.1
- Received：09 February 2021，
  
  Revised：28 February 2021，
  
  Published：2021-07
- 稿件说明：
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Ju GUO, Qiong-xin SHEN, Zong-zhao JIANG, et al. Optical performance of local dimming backlight unit based on Mini-LED sources[J]. Chinese journal of liquid crystals and displays, 2021, 36(7): 939-946.
DOI：

Ju GUO, Qiong-xin SHEN, Zong-zhao JIANG, et al. Optical performance of local dimming backlight unit based on Mini-LED sources[J]. Chinese journal of liquid crystals and displays, 2021, 36(7): 939-946. DOI： 10.37188/CJLCD.2021-0045.

摘要

Mini-LED背光能够通过精细化的分区实现局域动态调光，是当前液晶背光技术的研究热点。为揭示Mini-LED背光不同的调光单元形式对背光模组的光学性能和系统架构产生的不同影响，本文建立了Mini-LED背光模组区域调光单元的3种不同的光学模型，即直下式调光单元、侧入式调光单元，以及本文提出的角入式调光单元。通过对不同结构的Mini-LED发光源光学模型进行光学建模和仿真追迹，对调光单元进行了出光均匀性和光线利用率的对比。结果表明，角入式调光单元在未添加光学膜片的情况下，出光均匀性为67.27%且光线利用率为86.67%；在添加光学膜片的情况下，出光均匀性为84.70%且光线利用率为92.10%。与传统侧入式调光单元和直下式调光单元相比有不同程度的提升。本文结果对Mini-LED背光单元设计具有重要的理论指导意义和应用价值。

Abstract

Mini-LED backlight can realize local dynamic dimming through refined partitions

which is a research hotspot of current Liquid Crystal Display(LCD) backlight technology. This paper aims to reveal different impact on the optical performance and system architecture of the backlight module by different Mini-LED local dimming unit types. We establish three different optical models of the Mini-LED local dimming backlight unit

namely the direct-lit dimming unit

edge-lit dimming unit

and the corner-lit dimming unit proposed in this paper. Through optical modeling and simulation tracing for the optical models with Mini-LED light sources in different structures

the uniformity and light efficiency of the dimming unit are compared. The results show that the light uniformity is 67.27% and the light utilization rate is 86.67% of the corner-lit dimming unit without optical films. The light uniformity is 84.70% and the light utilization rate is 92.10% of the corner-lit dimming unit with optical films. The optical performance has improvement in different level compared with the edge-lit local unit and direct-lit local unit. This results have important theoretical guiding significance and application value for the design of Mini-LED backlight units.

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