OLED Encapsulation Asymmetric Inorganic Layers
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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 thin film encapsulation structure.
Innovation Solution
The solution involves an organic light emitting display device with a thin film encapsulation layer comprising alternately laminated inorganic and organic layers, where the areas of the inorganic layers are increased sequentially away from the display unit, and an outermost inorganic layer covers the edges, along with a capping layer made of ultraviolet light-absorbing material to enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin film encapsulation structure with alternately laminated organic and inorganic layers is used, then the device achieves thinness and flexibility, but moisture and oxygen penetration occurs at the edges of inorganic layers
Solution Approach 1:
The inorganic layers are designed with asymmetric area configuration where each successive inorganic layer has a larger area than the previous one, creating an overlapping structure that prevents edge exposure while maintaining thin film characteristics
Solution Approach 2:
The solution transitions from a uniform two-dimensional layer structure to a multi-dimensional overlapping configuration where inorganic layers extend beyond the display unit area in a stepwise manner, blocking moisture and oxygen penetration paths at the edges
2Object-affected harmful factors
If the area of inorganic layers is increased to block moisture penetration, then protection against moisture and oxygen improves, but a lifting phenomenon occurs between inorganic layers
Solution Approach 1:
Different regions of the encapsulation structure have different layer configurations - the inorganic layers are locally extended at the edges while maintaining standard thickness and composition, providing enhanced protection only where moisture penetration is most critical
Solution Approach 2:
The inorganic layers are pre-configured with increasing areas during the encapsulation structure formation process, creating an overlapping configuration that proactively prevents moisture penetration before it can occur at the edges
3Object-affected harmful factors
If the encapsulation structure is made more robust to prevent moisture penetration, then protection capability improves, but the device loses flexibility
Solution Approach 1:
The encapsulation structure uses thin film layers with a specific configuration where inorganic layers are laminated on organic layers in an overlapping manner, providing robust moisture protection while maintaining the flexibility needed for display device applications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces the lifting phenomenon and blocks moisture and oxygen penetration, improving the encapsulation structure's protective capabilities and maintaining the device's thinness and flexibility.
Implementation Method 1
A capping layer may be between the display unit and the encapsulation layer. The capping layer may include a transparent material having ultraviolet light absorbing capacity.
Data Source
AI summary
An organic light emitting display device includes: a substrate; a display unit on the substrate; and an encapsulation layer on the display unit, the encapsulation layer including a plurality of inorganic layers and a plurality of organic layers, the plurality of inorganic layers and the plurality of organic layers being alternately located, and the plurality of organic layers being at a region where the plurality of inorganic layers is located. The plurality of inorganic layers covers the display unit and is sequentially on the substrate, and areas of each of the inorganic layers are increased moving in a direction away from the display unit.