Foldable Display Protective Film for Impact-Resistant Bending

The patent applies a protective film made of POSS compound that functions as a flexible thin film layer. This film provides impact resistance and protection to the display device while maintaining flexibility for folding operations, directly addressing the contradiction by adding protective functionality through a thin film structure rather than bulky components.

The protective film is composed of polyhedral oligomeric silsesquoxane (POSS) compound, which is a composite material combining inorganic silicon oxide core with organic functional groups. This composite structure provides both the strength needed for impact resistance and the flexibility required for foldable devices, resolving the contradiction between strength improvement and structural complexity.

The patent carefully selects and controls the physical parameters of the protective film, specifically setting the Young's modulus at ≥1 GPa and break elongation at ≥20%. These parameter optimizations ensure the film has sufficient stiffness for impact resistance while maintaining adequate elasticity for repeated folding without permanent deformation, resolving the contradiction between strength and folding flexibility.

The protective film exhibits different mechanical properties at different scales: at the macro level, it provides high strength and rigidity for impact protection, while at the micro level, its molecular structure and thin-film configuration allow localized flexibility during folding. This local quality differentiation resolves the contradiction between overall strength and folding adaptability.

The patent employs a thin film configuration for the protective layer, optimizing the thickness to balance impact resistance with folding performance. The thin film structure provides sufficient protective function while minimizing interference with the folding mechanism, directly addressing the contradiction between thickness-related strength and folding ease.

Rather than using a thick protective layer that would guarantee strength but hinder folding, the patent applies a partial thickness (optimized range) that provides adequate protection for typical use cases while maintaining folding smoothness. This partial action approach resolves the contradiction by finding the minimum necessary thickness for acceptable protection without excessive thickness that would compromise flexibility.