首页 > 论文 > 液晶与显示 > 33卷 > 7期(pp:555-560)

可折叠OLED屏幕的弯折应力仿真

Stress simulation of foldable OLED screen bending

  • 摘要
  • 论文信息
  • 参考文献
  • 被引情况
  • PDF全文
分享:

摘要

柔性OLED屏幕在弯折的过程中,容易出现器件损伤、胶层剥离等现象。调整显示层的应力中性层位置和光学透明胶(OCA)胶层的应变是解决该问题的主要途径。本文通过建立柔性OLED屏幕的弯折仿真模型,分析了不同堆叠结构、保护盖板刚度、OCA胶层厚度、背板厚度和弯折半径对弯折后显示层应力中性层位置和OCA胶层应变的影响。结果表明,不同堆叠结构对显示层的应力中性层位置有很大影响,保护盖板刚度与OCA胶层厚度均对显示层的应力中性层位置无影响,背板厚度的增大使显示层应力中性层位置向下移动,弯折半径增大使结构应力下降,保护盖板刚度降低、OCA胶层厚度增大、背板厚度减小均对OCA胶层应变降低有利。仿真结果为柔性OLED的屏幕结构设计、材料选用以及解决弯折过程中出现的力学问题提供了参考。

Abstract

Flexible OLED screens are prone to produce the phenomenon such as optical device damage, OCA peeling during the folding problem. The position of the stress neutral layer in the display layers should be carefully adjusted and the strain of the OCA layers should be reduced to solve this issue. In this paper, a simulation model for the foldable OLED screen is established. The influence of stack structures, cover window stiffness, OCA thickness, back plate thickness and bend radius on the position of stress neutral layer and the strain of OCA layers are analyzed. The results show that different stack structures have great influence on the position of stress neutral layer in the display layer, but cover window stiffness and OCA thickness have no effect on it, thicker back plate makes the stress neutral layer in the display layer move downward, lager bend radius makes the stress of whole panel reduced, meanwhile, lower cover window stiffness, thicker OCA layer and thinner back plate are beneficial to the strain reduction of the OCA layers. The simulation results provide a reference for the design of flexible OLED screen structure, material selection and solving the problems occurred in the folding process.

Newport宣传-MKS新实验室计划
补充资料

中图分类号:TN141

DOI:10.3788/yjyxs20183307.0555

所属栏目:材料与器件

基金项目:教育部新世纪优秀人才支持计划(No. NCET-13-0229); 国家杰出青年基金(No. NSFC51725504)

收稿日期:2018-02-05

修改稿日期:2018-04-21

网络出版日期:--

作者单位    点击查看

刘正周:华中科技大学 材料科学与工程学院,湖北 武汉 430074
廖敦明:华中科技大学 材料科学与工程学院,湖北 武汉 430074
贾永臻:华中科技大学 材料科学与工程学院,湖北 武汉 430074
张 博:华中科技大学 材料科学与工程学院,湖北 武汉 430074
吴 棣:华中科技大学 材料科学与工程学院,湖北 武汉 430074
陈继峯:武汉华星光电半导体显示技术有限公司,湖北 武汉 430078

联系人作者:刘正周(467401235@qq.com)

备注:刘正周(1995-),男,湖北保康人,硕士生,主要从事有限元仿真分析方面的研究。

【1】LEOK. Organic light-emitting diodes: efficient and Flexible solution [J]. Nature Photonics, 2011, 5(12): 716-718.

【2】LEE S M, CHO Y, KIM D Y, et al. Enhanced light extraction from mechanically flexible, nanostructured organic light-emitting diodes with plasmonic nanomesh electrodes [J]. Advanced Optical Materials, 2015, 3(9): 1240-1247.

【3】马东阁. OLED显示与照明——从基础研究到未来的应用[J]. 液晶与显示,2016,31(3): 229-241.
MA D G. OLED display and lighting—from basic research to future applications [J]. Chinese Journal of Liquid Crystals and Displays, 2016, 31(3): 229-241. (in Chinese)

【4】刘晋红,张方辉. OLED薄膜干燥剂的制备及其对OLED的影响[J]. 发光学报,2017,38(1): 76-84.
LIU J H, ZHANG F H. Preparation of OLED desiccant film and the Impact for OLED [J]. Chinese Journal of Luminescence, 2017, 38(1): 76-84. (in Chinese)

【5】杨永强,段羽,陈平,等. 低温原子层沉积氧化铝作为有机电致发光器件的封装薄膜 [J]. 发光学报,2014,35(9): 1087-1092.
YANG Y Q, DUAN Y, CHEN P, et al. Deposition of Al2O3 film using atomic layer deposition method at low temperature as encapsulation layer for OLEDs [J]. Chinese Journal of Luminescence, 2014, 35(9): 1087-1092. (in Chinese)

【6】LEE S M, KWON J H, KWON S, et al. A review of flexible OLEDs toward highly durable unusual displays [J]. IEEE Transactions on Electron Devices, 2017, 64(5): 1922-1931.

【7】李琛,黄根茂,段炼,等. 柔性有机发光二极管材料与器件研究进展[J]. 中国材料进展,2016,35(2): 101-107.
LI C, HUANG G M, DUAN L, et al. Recent advances in organic light-emitting diodes for flexible applications [J]. Materials China, 2016, 35(2): 101-107. (in Chinese)

【8】曹艳,汪辉. OLED技术及柔性OLED性能、缺陷的研究[J]. 现代显示,2008(6): 36-39.
CAO Y, WANG H. The OLED technology, the performance and deficiency of flexible OLED [J]. Advanced Display, 2008(6): 36-39. (in Chinese)

【9】CAMPBELL C J, CLAPPER J, BEHLING R E, et al. Optically clear adhesives enabling foldable and flexible OLED displays [J]. SID Symposium Digest of Technical Papers, 2017, 48(1): 2009-2011.

【10】LEE CC, SHIH Y S, WU C S, et al. Development of robust flexible OLED encapsulations using simulated estimations and experimental validations [J]. Journal of Physics D: Applied Physics, 2012, 45(27): 275102.

【11】薛宗伟. 基于Abaqus的光学胶动态力学行为分析[J]. 计算机辅助工程,2013,22(S2): 404-407.
XUE Z W. Analysis on dynamic mechanical behavior for optical adhesive based on Abaqus [J]. Computer Aided Engineering, 2013, 22(S2): 404-407. (in Chinese)

【12】王文涛,上官文斌,段小成. 超弹性本构模型对橡胶隔振器静态特性预测影响的研究 [J]. 汽车工程,2012,34(6): 544-550,539.
WANG W T, SHANGGUAN W B, DUAN X C. A study on the effects of hyperelastic constitutive models on the static characteristic prediction of rubber isolator [J]. Automotive Engineering, 2012, 34(6): 544-550, 539. (in Chinese)

引用该论文

LIU Zheng-zhou,LIAO Dun-ming,JIA Yong-zhen,ZHANG Bo,WU Di,CHEN Ji-feng. Stress simulation of foldable OLED screen bending[J]. Chinese Journal of Liquid Crystals and Displays, 2018, 33(7): 555-560

刘正周,廖敦明,贾永臻,张 博,吴 棣,陈继峯. 可折叠OLED屏幕的弯折应力仿真[J]. 液晶与显示, 2018, 33(7): 555-560

您的浏览器不支持PDF插件,请使用最新的(Chrome/Fire Fox等)浏览器.或者您还可以点击此处下载该论文PDF