光学精密工程2025，Vol.33Issue(15)：2354-2364,11.DOI:10.37188/OPE.20253315.2354
多通道数字图像相关的柔性屏多层应变同步测量
Synchronous multilayer strain measurement of flexible displays based on multi-channel digital image correlation
摘要
Abstract
With the rapid expansion of the flexible display industry,represented by foldable smartphones,simultaneous measurement of deformation and stress distribution across multiple structural layers under bending has become a critical challenge for structural design and performance evaluation.A color multi-channel optical measurement system,integrating multi-channel Digital Image Correlation(DIC)with fluo-rescent labeling and the screen's own display,is presented to enable,for the first time,synchronous mea-surement of deformation and strain fields in multiple structural layers of a foldable screen during dynamic bending.The display layer produces red speckle patterns via intrinsic luminescence,while the surface pro-tective layer is endowed with blue fluorescent speckles by spray-coating a UV-excited powder,enabling non-destructive speckle application compatible with mass-produced flexible screens.Incorporation of green fluorescent powder into intermediate structural layers during manufacturing further permits synchronous measurement of additional layers.Color-speckle images are captured simultaneously by a color camera sys-tem and spectrally separated.Full-field deformation and strain distributions for each structural layer are then computed independently using DIC algorithms.The system attains in-plane and out-of-plane deforma-tion measurement accuracies of 1 μm and 5 μm,respectively,satisfying the high-precision requirements of multilayer material characterization in flexible-screen design and testing.Experimental results confirm that the proposed method accurately and synchronously retrieves deformation and strain fields for each layer of a flexible display,offering an innovative,non-destructive testing tool for reliability assessment of flexible displays.关键词
数字图像相关/柔性屏/显示散斑/荧光散斑/应变测量Key words
digital image correlation/flexible display screen/displayed speckle/fluorescent speckle/strain measurement分类
机械制造引用本文复制引用
李骏睿,曾湘文,周露,宋浩林,王永红..多通道数字图像相关的柔性屏多层应变同步测量[J].光学精密工程,2025,33(15):2354-2364,11.基金项目
国家自然科学基金资助项目(No.52205562,No.52375536) （No.52205562,No.52375536）
中央高校基本科研业务费专项资金资助项目(No.JZ2025HGTB0197) （No.JZ2025HGTB0197）
