多通道数字图像相关的柔性屏多层应变同步测量

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关键词：数字图像相关；柔性屏；显示散斑；荧光散斑；应变测量中图分类号：TH74；O348.1 文献标识码：Adoi：10.37188/OPE.20253315.2354 CSTR：32169.14.OPE.20253315.2354

Synchronous multilayer strain measurement of flexible displays based on multi-channel digital image correlation

LI Junrui"， ZENG Xiangwen， ZHOU Lu， SONG Haolin，WANG Yonghong （School of Instrument Science and Opto-electronic Engineering， Hefei University of Technology， Hefei230009，China） * Corresponding author，E-mail： lijunrui@hfut. edu. cn

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 challnge for structural design and performance evaluation. A color multichannel optical measurement system，integrating multi-channel Digital Image Correlation （DIC）with fluorescent labeling and the screen's own display，is presented to enable，for the first time，synchronous measurement 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 protective 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 system and spectrally separated. Full-field deformation and strain distributions for each structural layer are then computed independently using DIC algorithms.The system attins in-plane and out-of-plane deformation measurement accuracies of 1{μm and 5μm ，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，ofering an innovative，non-destructive testing tool for reliability assessment of flexible displays.

Key Words： digital image correlation； flexible display screen；displayed speckle； fluorescent speckle;strain measurement

1引言

随着显示技术的不断发展与广泛应用，柔性有机发光二极管（OrganicLight-EmittingDi-ode，OLED）显示屏逐渐成为现代电子设备的核心组件，尤其在智能手机、可穿戴设备等领域展现出独特的优势[1]。（剩余13993字）