Multilayer Inorganic Encapsulation for OLED Light Extraction

The first inorganic layer is segmented into multiple sub-layers (first sub inorganic layer, second sub inorganic layer, third sub inorganic layer) with alternating high and low refractive indices. This segmentation enables the layer to extract different wavelength components of light (blue, green, red) more efficiently, resolving the contradiction between structural simplicity and light extraction performance.

Different sub-layers within the first inorganic layer are assigned different refractive indices and thicknesses optimized for specific wavelength ranges. The first sub inorganic layer targets blue light (380-450 nm), the second sub inorganic layer targets green light (480-580 nm), and the third sub inorganic layer targets red light (590-700 nm). This local optimization of optical properties resolves the contradiction by enabling wavelength-specific light extraction without requiring a completely complex multi-layer structure.

The encapsulating member is segmented into multiple functional layers: inorganic layers (310a, 310b, 310c) for barrier protection against water and oxygen, and organic layers (320a, 320b) for additional protection and stress management. This segmentation allows each layer to specialize in specific protective functions, achieving comprehensive protection while maintaining reasonable structural complexity through systematic layer assignment.

The encapsulating member uses a composite structure combining inorganic materials (silicon oxide, silicon nitride, silicon oxynitride) and organic materials (polymer encapsulation layers). This composite approach leverages the advantages of both material types: inorganic layers provide excellent barrier properties against water and oxygen penetration, while organic layers provide flexibility, stress relief, and additional protection. The composite structure achieves superior reliability without excessive complexity by selecting materials that complement each other's strengths.