In this study, an improved multi-layer structure was proposed to prevent delamination and permanent deformation in a rollable display. After obtaining the equivalent material properties of the OLED panel using homogenization method, the strain of each layer in rollable display was estimated through finite element analysis, and the possibility of delamination and plastic deformation was predicted based on the yield strain in each film layer and the shear strain in adhesives between film layers. As the display module rolls, the difference of displacement between layers accumulates and the shear strain in adhesives increases. The delamination and the permanent deformation has been resolved using high modulus adhesives and hyper-elastic cover film material.

在这项研究中，提出了一种改进的多层结构，以防止可卷曲显示器出现分层和永久变形。使用均质化方法获得OLED面板的等效材料特性后，通过有限元分析估算可卷曲显示器中各层的应变，并根据各膜层的屈服应变和薄膜的屈服应变来预测分层和塑性变形的可能性。薄膜层之间的粘合剂中的剪切应变。随着显示模块滚动，各层之间的位移差异会累积，并且粘合剂中的剪切应变会增加。使用高模量粘合剂和超弹性覆盖膜材料已解决了分层和永久变形的问题。