Short focal length lens array based on liquid crystal material with large Δ<italic style="font-style: italic">n</italic>

Rui LI; Qiong-hua WANG

doi:10.37188/CJLCD.2020-0288

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Short focal length lens array based on liquid crystal material with large Δn

Device Physicsand Device Preparation | 更新时间：2021-04-02

- Short focal length lens array based on liquid crystal material with large Δn
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 4, Pages: 509-515(2021)
- 作者机构：
  
  1.四川大学电子信息学院, 四川成都 610065
  2.北京航空航天大学仪器科学与光电工程学院, 北京 100191
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(61927809)
- DOI：10.37188/CJLCD.2020-0288
  CLC： TP394.1;O753.2
- Received：26 October 2020，
  
  Revised：19 December 2020，
  
  Published：2021-04
- 稿件说明：
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Rui LI, Qiong-hua WANG. Short focal length lens array based on liquid crystal material with large Δn[J]. Chinese journal of liquid crystals and displays, 2021, 36(4): 509-515.
DOI：

Rui LI, Qiong-hua WANG. Short focal length lens array based on liquid crystal material with large Δn[J]. Chinese journal of liquid crystals and displays, 2021, 36(4): 509-515. DOI： 10.37188/CJLCD.2020-0288.

摘要

为了在不改变液晶透镜孔径的基础上减小其焦距，本文提出了一种基于大Δ

液晶材料的短焦距透镜阵列。该透镜阵列采用大Δ

液晶材料，使其在低驱动电压下便可以积累较大的光程差。下基板采用ITO驱动电极与ITO接地电极交替排列的结构，且ITO驱动电极位于介电层上方。ITO接地电极使其边缘区域内存在弱电场，介电层平滑了液晶层内的电场。该设计不仅在大孔径范围内实现抛物线形的相位分布，且减小了驱动电压。仿真结果表明，当驱动电压为6 V时，该液晶透镜阵列的相位分布曲线与理想抛物线匹配较好。单个液晶透镜中心与边缘的相位差为42.17π左右，使其达到最小焦距约1.72 mm。当驱动电压从0 V增加到6 V时，液晶透镜阵列的焦距从∞减小到1.72 mm左右。因此，该液晶透镜阵列可以应用于2D/3D可切换显示、AR显示等领域。

Abstract

In order to reduce the focal length of liquid crystal lens without changing the aperture

a short focal length lens array based on liquid crystal material with large Δ

is proposed. The liquid crystal layer accumulates large optical path difference under low driving voltage because of the use of the liquid crystal material with large Δ

. The bottom substrate adopts the structure of alternating ITO driving electrode and ITO grounding electrode

and the ITO driving electrode is located above the dielectric layer. The ITO grounding electrode causes a weak electric field in its edges

the dielectric layer smooths the electric field in the liquid crystal layer. This design not only realizes the parabolic phase distribution in the large aperture range

but also reduces the driving voltage. The simulation results show that when the driving voltage is 6 V

the phase distribution of the liquid crystal lens array matches well with the ideal parabola. The phase difference between the center and edge of individual liquid crystal lens is approximately 42.17π

which results in a minimum focal length of about 1.72 mm. With the driving voltage increasing from 0 V to 6 V

the focal length of the liquid crystal lens array decreases from ∞ to about 1.72 mm. Therefore

the proposed liquid crystal lens array can be used in many application areas

such as 2D/3D switchable display

and AR display.

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Keywords

references

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Rui LI

Qiong-hua WANG

CHU Fan

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School of Electronics and Information Engineering， Sichuan University

School of Instrumentation and Optoelectronic Engineering， Beihang University

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Short focal length lens array based on liquid crystal material with large Δn

DOI：10.37188/CJLCD.2020-0288

摘要

Abstract

关键词

Keywords

references