Foldable Window High-Modulus Films Impact Resistance

The patent applies composite materials by creating a multi-layer window structure comprising a first film, second film, and adhesive layer. Each layer is specifically designed with certain mechanical properties, and their combination produces synergistic effects that enhance overall impact resistance and durability while maintaining flexibility. The composite structure allows each layer to contribute different functional characteristics, resolving the contradiction between flexibility and durability.

The patent implements local quality by assigning different mechanical properties to different layers of the window structure. The first and second films have specific modulus requirements (7-15 GPa) to provide rigidity where needed, while the adhesive layer has controlled thickness (1-5 μm) and adhesive strength (7 N/20 mm or more) to provide flexibility. This localized optimization of properties throughout the structure enables the window to simultaneously achieve durability and flexibility.

The patent applies parameter changes by precisely controlling the modulus of the first and second films within 7-15 GPa, the adhesive layer thickness within 1-5 μm, and the adhesive strength at 7 N/20 mm or more. By optimizing these parameters, the window structure achieves the right balance between strength and flexibility. The specific parameter ranges ensure the window is robust enough for impact resistance while remaining flexible for folding operations.

The patent implements local quality by creating regions with different mechanical properties within the window structure. The film layers provide localized rigidity for impact resistance, while the thin adhesive layers provide localized flexibility for folding. This spatial differentiation of mechanical properties allows the structure to simultaneously exhibit both strength and adaptability.

The patent applies parameter changes by optimizing the adhesive layer thickness to a specific range of 1-5 μm, which is thin enough to minimize material usage but thick enough to provide sufficient bonding strength of 7 N/20 mm or more. This precise parameter control resolves the contradiction between reliability and material quantity by finding the optimal thickness value that satisfies both requirements.

The patent implements a simplified approach by using a uniform adhesive layer with standardized thickness and strength requirements across the window structure. This standardized design allows for efficient manufacturing and material usage while maintaining consistent bonding performance, avoiding the need for variable thickness or additional bonding mechanisms.