Fig. 1. Schematic of DIC principle

Fig. 2. Mounting method for flexible screen

Fig. 3. Test sample of flexible screen

Fig. 4. Geometric model of bending structure

Fig. 5. Experimental setup. (a) Schematic; (b) structure

Fig. 6. Evolution cloud diagram of principal engineering strain

Fig. 7. Strain evolution curve graph at the folding point of the protective layer

Fig. 8. Spatial strain curve