OLED Encapsulation Layer Edge Expansion for Moisture Barrier
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Solution Overview
Problem
Organic light emitting display devices face issues with moisture and oxygen penetration, leading to deterioration and a lifting phenomenon between inorganic layers in the encapsulation structure, which existing encapsulation methods fail to adequately address.
Innovation Solution
The proposed solution involves an encapsulation structure with a plurality of alternately laminated inorganic and organic layers, where the inorganic layers are sequentially expanded to cover the edges of the organic layers, preventing moisture and oxygen penetration and reducing the lifting phenomenon by ensuring the upper inorganic layer does not cover the end portions of the lower inorganic layer, and additional layers are added to further secure the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin film encapsulation structure with alternately laminated organic and inorganic layers is used, then flexibility is improved, but moisture and oxygen penetration occurs at the edges of inorganic layers
Solution Approach 1:
The patent transitions from a single-layer inorganic encapsulation to a multi-layer structure with alternating organic and inorganic layers. This dimensional expansion in the layering approach creates a more comprehensive barrier system that addresses edge penetration issues while preserving flexibility through the organic layer components.
Solution Approach 2:
The encapsulation structure combines organic and inorganic materials in alternating layers. The inorganic layers provide barrier properties against moisture and oxygen, while the organic layers contribute flexibility. This composite approach allows both contradictory requirements to be satisfied simultaneously.
2Object-affected harmful factors
If inorganic layers are made larger to cover edges, then moisture blocking is improved, but lifting phenomenon occurs between inorganic layers
Solution Approach 1:
The encapsulation structure is segmented into multiple alternating organic and inorganic layers rather than using single continuous inorganic layers. This segmentation allows each layer to be optimized independently - inorganic layers for moisture blocking and organic layers for stress management - thereby preventing lifting while maintaining effective edge coverage.
Solution Approach 2:
Different layers are assigned different functions and properties: inorganic layers provide moisture and oxygen barrier properties at critical edge regions, while organic layers provide flexibility and stress relief. This local differentiation of material properties allows the structure to simultaneously achieve moisture blocking and prevent lifting phenomena.
3Reliability
If multiple inorganic layers are added to prevent penetration, then protection is improved, but device complexity increases
Solution Approach 1:
The alternating organic-inorganic layer structure serves multiple functions simultaneously: inorganic layers provide moisture and oxygen barrier properties, organic layers provide flexibility and stress management, and the alternating configuration prevents lifting. This multi-functionality achieves enhanced protection without proportionally increasing complexity, as each layer contributes to multiple performance aspects.
Data Source
AI summary
An organic light emitting display device, and more particularly, to an organic light emitting display device that reduces (or prevents) penetration of moisture into ends of inorganic layers and a lifting phenomenon between inorganic layers, by increasing areas of a plurality of inorganic layers included in a thin film encapsulation layer in sequence.