Design of optical film with microstructure for viewing angle deflection

doi:10.3788/OPE.20162405.1009

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Design of optical film with microstructure for viewing angle deflection

更新时间：2020-08-13

- Design of optical film with microstructure for viewing angle deflection
- Optics and Precision Engineering Vol. 24, Issue 5, Pages: 1009-1014(2016)
- 作者机构：
  
  合肥工业大学特种显示技术教育部重点实验室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
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20162405.1009
  CLC： TN141.9
- Received：06 January 2016，
  
  Revised：26 February 2016，
  
  Published：25 May 2016
- 稿件说明：
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冯奇斌, 尹慧娟, 程鑫等. 用于视角偏转的光学膜表面微结构设计[J]. 光学精密工程, 2016,24(5): 1009-1014

FENG Qi-bin, YIN Hui-juan, CHENG Xin etc. Design of optical film with microstructure for viewing angle deflection[J]. Editorial Office of Optics and Precision Engineering, 2016,24(5): 1009-1014
冯奇斌, 尹慧娟, 程鑫等. 用于视角偏转的光学膜表面微结构设计[J]. 光学精密工程, 2016,24(5): 1009-1014 DOI： 10.3788/OPE.20162405.1009.

FENG Qi-bin, YIN Hui-juan, CHENG Xin etc. Design of optical film with microstructure for viewing angle deflection[J]. Editorial Office of Optics and Precision Engineering, 2016,24(5): 1009-1014 DOI： 10.3788/OPE.20162405.1009.

摘要

针对传统的液晶显示器应用于一些驾驶舱时存在的特殊观看视角问题

设计了一种新型的光学膜

以使液晶显示器的最大亮度可根据观看者的位置实现特定角度的偏转。首先

基于现有背光的配光曲线

提出光学膜表面微结构为直角三角形;考虑由于直角边的全反射

半光强视角范围较窄且存在截止角

对微结构进行了棱高和角度的优化设计

使半光强处视角范围得到提高。为消除截止角并进一步增大半亮度视角范围

对微结构再次进行优化设计

提出了双峰折线形非对称的光学膜表面微结构。仿真结果表明:水平视角不变时

偏转膜垂直方向最大亮度在20°处

透过率为87.3%

半亮度视角为(-12.5°

45°)。根据设计结果加工了实际样品并进行了实验测试

测试结果表明:与传统的背光视角相比

偏转膜垂直方向最大亮度由原来的0°偏转到18.9°

半亮度视角由(-24.1°

23.5°)变为(-9.2°

45.3°)

透过率为82.0%

满足了特定视角的观看要求。

Abstract

When a liquid crystal display is used in cockpits

its max luminance direction usually has a certain angle with the direction of viewers. Therefore

this paper designs an optical film with a microstructure surface to allow the max luminance to be changed with the direction of viewers. Based on the luminous distribution of common backlight

the microstructure surface of the optical film was designed as a right triangle. In consideration of the total reflection of the right-angle side

narrower half-luminance angle range and its cut-off angle

the height and the angle of the microstructure were optimized to improve the half-luminance angle ranges. To eliminate cut-off angle and to increase half-luminance angle ranges further

the microstructure was optimized once again

and the outline with two peaks for the microstructure was proposed. The simulation results show that when the horizontal viewing angle doesn't change

the vertical viewing angle is at about 20°

the transmittance is 87.3% and the half-luminance angle ranges are (-12.5°

45°). On the basis of the design

a sample was produced and measured. The practical measurement results show that the angle of max luminance turns from 0° to 18.9°

the half-luminance viewing angle changes from (-24.1°

23.5°) to (-9.2°

45.3°)

and the transmittance is 82.0% as compared with the common backlight without the optical film. These results satisfy the requirements of special viewing angles.

关键词

Keywords

references

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Related Institution

National Engineering Laboratory of Special Display Technology， Hefei University of Technology

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State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University

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