Film strain measurement method of flexible display modules based on mechanical theory
Abstract
<p indent="0mm">The flexible organic light-emitting diode (OLED) display modules are composed of films and adhesives, and the films are prone to damage during the folding process. To ensure the trouble-free use of the module, it is necessary to measure the film strain experimentally, but current methods are not suitable for the strain measurement of each film in the OLED module. In this paper, the relative slips among various films of the OLED module are measured based on the computed tomography method, and the relationship between the relative slips and strains is deduced according to mechanical theory. The strain of each film is indirectly obtained by measuring the relative slips among various films, providing a new method for strain measurement. Then, it is compared with the simulation results, so the accuracy of material parameters and the reliability of strain measurement theory are verified. Finally, the factors affecting the accuracy of the strain measurement method are explored. The analysis shows that the accuracy of strain measurement is ensured by the strain right after the module stops bending and the seamless adhesion between the module and frame.</p>
