P‐10.13: Research on improving the bending ability of foldable AMOLED mobile screen by overlaying FMLOC and COE technology

The market development trend of foldable AMOLED screen is introduced in the article, and then the core links of the industry chain of foldable mobile phones is drawn off. Furthermore, that improving the bending ability is an urgent problem to be solved in achieving lightweight is proposed. Based on this demand, a specific structural scheme and a complete set of bending ability evaluation methods to achieve lightweight affect are put forward. By combining bending simulation and product failure test, the mechanism is analyzed, and also, the main and secondary factor affecting bending ability are proposed. After that, a standardized improvement system for bending ability, including optimization of membrane quality, structural optimization, and process optimization, is validated and applied. On condition that an average bending radius of 1.5mm for Panel and 1.3mm for MDL are achieved ultimately, that has reached the international leading level. Moreover, based on the stress simulation research, a nonlinear model relationship between the strain of the TLD film layer (SiNx) and the clamp distance, which is a key factor affecting the bending ability and can predict the bending ability, is established. Finally, the future development direction and research direction of improving the bending ability of foldable AMOLED screen are prospected.