OLED Encapsulation Mixed Area 3D Network
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Solution Overview
Problem
Existing OLED displays face issues with the sealing function of their encapsulation layers, which are prone to moisture and oxygen penetration, leading to degradation of the organic light emitting elements and potential layer falling-off, due to inadequate bonding between organic and inorganic layers.
Innovation Solution
The OLED display incorporates a multilayer encapsulation structure with a mixed area where organic and inorganic materials coexist, featuring groove or hole formations in the organic layer that are filled by an inorganic layer, enhancing bonding and forming a 3-D crossing network structure to improve sealing and reduce internal reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer encapsulation structure is formed by alternatively layering organic and inorganic layers, then the sealing function is improved, but the bonding between layers is insufficient leading to layer falling-off
Solution Approach 1:
The patent transitions from a planar 2D interface between organic and inorganic layers to a 3D interpenetrating network structure. Groove portions are formed in the organic layer and filled with inorganic material, creating vertical interlocking features that add a third dimension to the bonding interface, thereby significantly enhancing adhesion strength and preventing layer falling-off.
Solution Approach 2:
The patent creates a composite encapsulation structure where organic and inorganic materials are combined in a specific architectural pattern. The mixed area with groove portions filled by inorganic material forms a composite structure that leverages the complementary properties of both material types, achieving both improved sealing function and enhanced bonding strength.
2Reliability
If the encapsulation layer is formed to seal the display portion, then protection from moisture and oxygen is improved, but internal reflection increases reducing light extraction efficiency
Solution Approach 1:
The patent uses groove portions that extend vertically into the organic layer, creating a 3D mixed area structure. This vertical dimensionality change allows the encapsulation layer to maintain its protective sealing function while the irregular 3D interface reduces internal reflection by scattering light paths, thereby improving light extraction efficiency without compromising protection.
Data Source
AI summary
An organic light emitting diode (OLED) display a includes: a substrate; an organic light emitting element on the substrate and including a first electrode, a light emission layer, and a second electrode; and an encapsulation layer on the substrate while covering the organic light emitting element. The encapsulation layer includes an organic layer and an inorganic layer. A mixed area, where organic materials forming the organic layer and inorganic materials forming the inorganic layer co-exist along a plane direction of the encapsulation layer, is formed at the boundary between the organic layer and the inorganic layer.