Curved Interlayer Film for OLED Donor Substrate Adhesion

The patent applies curvature to the interlayer film by forming it with a wrinkled surface having convex and concave portions. This curved/wrinkled structure increases the surface area and creates mechanical interlocking with the organic emission layer, thereby improving adhesion without complicating the overall manufacturing process. The wrinkled structure is formed by controlling the deposition process to create this specific surface morphology.

The patent applies local quality by creating regions with different surface properties in the interlayer film. The wrinkled structure has convex portions that protrude and concave portions that recess, creating localized areas with different adhesion characteristics. This allows the organic emission layer to be transferred effectively while maintaining good contact and alignment with underlying layers, thereby improving luminous efficiency.

The patent resolves this contradiction by using a wrinkled surface structure with gradual transitions between convex and concave portions. Instead of sharp curves, the wrinkled structure provides gentle, progressive curvature that maintains mechanical interlocking while ensuring good contact between layers. This approach balances adhesion improvement with manufacturability, as the wrinkled structure can be formed through controlled deposition processes.