Abstract
Nowadays, the foldable touch display panel, comprising flexible display and foldable touch panel, can substantially change the people’s stereotype on the conventional display, which turns from heavy and frangible to light, thin and malleable. The foldable touch display panel thus becomes the potential product in the next generation. Nevertheless, some technical challenges, such as bending failure due to the high bendability of the foldable touch display panel, are encountered during the development of foldable touch display panel. The bending failure is attributed to not only the cohesive failure of the materials in the display panel but also the interfacial failure due to the buckling-driven delamination at the interface between coating layer and substrate. It is worthwhile to pay attention to these two critical issues. In order to effectively enhance the bendable reliability of the foldable touch display panel, the thesis aims at investigating the foldable touch display panel with elastic gel-frame package protection structure proposed by the industrial technology research institute. The finite element analysis software, i.e., ANSYS®, is first applied to evaluate the bendable behavior of the foldable touch display panel. A comparison between the foldable touch display panel with the protection structure and conventional foldable touch display panel without the protection structure is also made. Additionally, the parametric study on the foldable touch display panel with the protection structure, including various material property and geometry size, are performed based on the Taguchi experimental design. The parametric study can provide a reference for designing the foldable touch display panel with the best bendable reliability. Next, the thesis further used the finite element analysis software, ANSYS®, to analyze the buckling-driven delamination failure for the foldable touch display panel. The validation of the proposed finite element analysis model is also demonstrated by a comparison between the present results and analytic solution. Finally, the resistance ability of buckling-driven delamination failure can be improved based on the aforementioned parametric study. The results in the thesis can not only enhance the bendable reliability of the foldable touch display panel but also reduce the possibility of cohesive failure and interfacial failure. The results can supply a reference for development engineers to design the foldable touch display panel.