Analytical Study of Multilayered Rollable OLED Display Structure Using Finite Element Method

Abstract

Recently flexible display evolves in terms of shape deformable display with various form factor merits. More recently, technical interest in Rollable OLED Displays which can be rolled up screen is rapidly increasing beyond curved, bendable and foldable displays toward expandable and on-demand screen variable display. Based on this expanded shape deformation, Rollable OLED Display is expected to bring innovations in various IT devices such as smartphones and TVs. However, from the technical point of view, it is highly challengeable due to the multi-layer stacked structures of Rollable OLED, which has not uniform and large sized deformation characteristic behaviors. In order to overcome this problematic deformation, multi-layered Rollable OLED structure studies are highly required [1-3].In order to obtain mechanical reliability, we studied the delamination behaviors in multi-layered Rollable OLED Display. This problematic large deformation of multi-layered structures under rolling deformation stress condition was observed by analytic study using Finite Element Method (FEM). The Rollable multi-layered structures were studied based on the rolling multi-layered model with radius R, such as Fig 1. In this study, with additional complex boundary conditions study, we will present visual and mechanical stress-strain studies how to improve the delamination problem in multi-layered structures.