OLED Inorganic Encapsulation Layer Water Vapor Barrier

The patent employs a composite encapsulation structure combining organic encapsulation layers with inorganic encapsulation layers. The organic layers provide ease of manufacture and flexibility, while the inorganic layers (such as aluminum oxide or silicon oxide) provide superior barrier properties against water vapor and oxygen penetration, thereby resolving the contradiction between manufacturability and protection reliability.

The patent uses thin film encapsulation layers that are both flexible and protective. The inorganic encapsulation layers are deposited as thin films that conform to the underlying structure, providing effective barrier protection while maintaining the flexibility and manufacturability needed for OLED device production.

Instead of using a single thick encapsulation layer, the patent employs multiple thinner inorganic encapsulation layers deposited sequentially. Each layer is formed through atomic layer deposition (ALD) process, creating a multi-layer composite structure that achieves superior barrier performance with thinner total thickness, thereby improving reliability without proportionally increasing device complexity.

The encapsulation structure is segmented into multiple discrete inorganic layers separated by organic interlayer regions. This segmentation allows each layer to be optimized independently and provides cumulative barrier effectiveness that exceeds what a single thick layer could achieve, improving protection while maintaining manageable device complexity.