Simulation Study On Rolling Behavior And Key Performance Optimizing Of Flexible OLED

In recent years,with the rapid development of the display industry,OLED has a tendency of replacing the traditional LCD display industry.As the main carrier of human-computer interaction,the screen's color,power consumption,brightness,life and other factors are closely related to the device's usage experience.However,flexible OLED display still exists many defects,such as folds,fractures,glue material Peeling,especially in the curled screen,the strain variable is so huge that the risk of screen failure increase sharply.In order to optimize the flexible module and improve the service life of the flexible screen,this paper modeled the OLED flexible module based on ABAQUS /CAE,analyzed the stress and strain of the fragile layer and OCA material,and discussed the influence of various factors on the rollable performance.The main work is as follows:(1)Studing the mechanical behavior of rubber materials and the theory of film strength.The generalized Maxwell model is used to characterize viscoelasticity,and the Yeoh model is used to characterize superelasticity.The fitting accuracy and simulation stability of the model are evaluated.Analyze the fragile position of the module structure,and use the maximum linear strain LE11 as the failure criterion of the fragile layer,and the maximum tensile stress S22 and the maximum shear stress S12 as the failure criterion of the adhesive material according to the appropriate strength theory for different film layers.(2)Establishing simulation model and analyzing the distribution of stress and strain.Study the force and deformation of the module during the whole process of curling-standing-relaxing-standing,discover the wrinkles of the module during the curling process,analyze the causes of wrinkles and verify them.Adjust the laminated structure,optimize the simulation model to eliminate wrinkles,derive the deflection curve for the new model,analyze the influencing factors of the curling result,and analyze the high-risk areas of module failure.Determine the possible failure modes of each film layer,and analyze the possibility of brittle fracture,plastic deformation,interface peeling and other defects in the film layer.(3)Discuss the influence of different crimping conditions on the results and optimize the crimping performance.Study the influence of factors such as curling radius,curling speed,film modulus and thickness,rubber modulus and thickness on the results,and compare the change trend of stress and strain under different conditions.Combining the simulation results,analyze the risk of brittle fracture of the TFE layer,AMOLED layer and Peeling of OCA glue,and then propose reasonable crimping conditions,optimize the laminated structure,reduce internal stress,and reduce the risk of defects in the flexible OLED screen during the crimping process.