OLED Barrier Layer with Tapered Auxiliary Electrodes

The patent applies composite materials by combining an inorganic sealing film layer with an organic protective layer. The inorganic layer provides excellent moisture and oxygen blocking properties, while the organic layer provides flexibility and crack resistance. This composite structure resolves the contradiction by allowing each material to contribute its strengths, preventing the sealing film from cracking while maintaining effective blocking function.

The patent changes the physical and chemical parameters of the sealing structure by using a multi-layer configuration with different material properties. The inorganic layer has high density and low permeability for blocking, while the organic layer has high elasticity and toughness for crack resistance. By adjusting the thickness and material composition of each layer, the patent optimizes both blocking performance and mechanical strength.

The patent uses composite materials where the hard inorganic barrier layer provides resistance to moisture and oxygen penetration, while the softer organic protective layer provides flexibility and absorbs mechanical stress. This combination allows the hard blocking layer to function effectively without being prone to cracking, as the organic layer compensates for mechanical weaknesses.

The patent introduces a flexible organic protective layer that covers the rigid inorganic sealing film. This flexible outer layer acts as a protective shell that can accommodate thermal expansion and mechanical stress without transmitting excessive stress to the underlying hard barrier layer, thereby preventing cracks while maintaining the blocking function.

The patent employs composite materials to create a sealing structure that combines the advantages of both inorganic and organic materials. The inorganic layer provides long-term chemical stability and blocking performance, while the organic layer provides mechanical flexibility and stress resistance. This composite approach extends the OLED lifetime by preventing both chemical degradation and physical failure of the sealing film.

The patent applies beforehand cushioning by introducing a compliant organic protective layer that absorbs and distributes mechanical stress before it can reach the brittle inorganic sealing film. This pre-cushioning effect prevents crack initiation and propagation, ensuring the sealing film maintains its integrity throughout the extended operational lifetime of the OLED device.