Design of optical brightness enhancement film for direct-lit backlight in automobile head-up display

Qi-bin FENG; Chen-chen WU; De-hua LI; Zi WANG; Guo-qiang LÜ

doi:10.3788/OPE.20192707.1426

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Design of optical brightness enhancement film for direct-lit backlight in automobile head-up display

Modern Applied Optics | 更新时间：2020-08-13

- Design of optical brightness enhancement film for direct-lit backlight in automobile head-up display
- Optics and Precision Engineering Vol. 27, Issue 7, Pages: 1426-1434(2019)
- 作者机构：
  
  1.合肥工业大学特种显示技术国家工程实验室现代显示技术省部共建国家重点实验室光电技术研究院, 安徽合肥 230009
  2.合肥工业大学仪器科学与光电工程学院, 安徽合肥 230009
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192707.1426
  CLC： TN141.9
- Received：29 December 2018，
  
  Accepted：07 February 2019，
  
  Published：15 July 2019
- 稿件说明：
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Qi-bin FENG, Chen-chen WU, De-hua LI, et al. Design of optical brightness enhancement film for direct-lit backlight in automobile head-up display[J]. Optics and precision engineering, 2019, 27(7): 1426-1434.
DOI：

Qi-bin FENG, Chen-chen WU, De-hua LI, et al. Design of optical brightness enhancement film for direct-lit backlight in automobile head-up display[J]. Optics and precision engineering, 2019, 27(7): 1426-1434. DOI： 10.3788/OPE.20192707.1426.

摘要

为了降低直下式背光的厚度并提升亮度

设计了一种光学增亮膜。基于Snell定律设计了对单个LED发出光线起均匀照度作用的二维微结构曲线。该微结构曲线是把LED看做理想点光源设计并计算的

但考虑到实际的LED是一个正方形发光面

因此对该微结构曲线进行了优化

提升了它对实际尺寸LED的均匀照度作用。根据LED的排布规律提出了一种正六边形蜂窝拼接排布方案

并进行了仿真分析。仿真结果表明：使用光学增亮膜的背光中心亮度提升了172.4%。根据微结构设计结果采用无掩膜直写光刻工艺制作了实际样品并进行了效果测试

测试结果表明：中心亮度提升了136.2%

厚度降低了13 mm。采用本文设计的光学增亮膜可以有效地提高背光亮度同时降低背光厚度

满足汽车抬头显示器的直下式背光亮度高、体积小的要求。

Abstract

The direct-lit backlight used in an automobile head-up display must have high brightness and a small size. To reduce the thickness of a direct-lit backlight and improve its brightness

an optical brightness enhancement film is designed. First

a two-dimensional microstructure curve for the uniform illumination of light emitted by a single light-emitting diode (LED) is designed according to Snell's law. A microstructure curve is designed and calculated with an LED as an ideal point light source. Based on the consideration that the actual LED is a square luminous surface

the microstructure curve is optimized and its uniform illumination function to a real LED is improved. Then

based on the arrangement of LEDs

a hexagonal honeycomb arrangement is proposed and a simulation analysis is conducted. Simulation results show that the central brightness of use of the optical brightness enhancement film is increased by 173.2%. From the results of the microstructural design

a practical sample is produced by using the maskless direct lithography process and its effect is tested. Test results show that the central brightness is increased by 136.2% and the thickness is reduced by 13 mm. The proposed optical brightness enhancement film can effectively improve brightness and reduce the thickness of backlight units.

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references

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Related Author

Guo-qiang LÜ

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Qi-bin FENG

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Qi-bin FENG

Li-ye XU

Related Institution

Special Display and Imaging Technology Innovation Center of Anhui Province National Engineering Laboratory of Special Display Technology， Academy of Photoelectric Technology， Hefei University of Technology

School of Electronic Science &Applied Physics， Hefei University of Technology

School of Instrumentation and Opto-Electronics Engineering，Hefei University of Technology

AVIC Hua Dong Photoelectric Co. Ltd.

National Engineering Lab of Special Display Technology， National Key Lab of Advanced Display Technology， Academy of Photoelectric Technology， Hefei University of Technology

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