Amphiphilic Cross-Linking Sublayer for OLED Encapsulation
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Solution Overview
Problem
Current encapsulating technologies for OLED devices are inadequate in withstanding moisture and oxygen, leading to a shortened service life due to cracks in inorganic encapsulating layers and weak binding forces between inorganic and organic layers, which allow moisture and oxygen to reach the encapsulated elements.
Innovation Solution
A display panel with an encapsulating structure comprising a first inorganic encapsulating sublayer, a first organic encapsulating sublayer, and a first amphiphilic cross-linking sublayer between them, where the amphiphilic cross-linking sublayer enhances the chemical bonding between the inorganic and organic layers, reducing cracks and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin film encapsulating technology is used with multiple inorganic and organic layers, then encapsulation is provided, but cracks occur in inorganic layers and binding forces between layers are weak
Solution Approach 1:
An amphiphilic cross-linking layer is introduced as an intermediary between the inorganic encapsulating layer and the organic encapsulating layer. This cross-linking layer contains both hydrophilic groups (such as silane groups) that bond with the inorganic layer and hydrophobic groups (such as epoxy or vinyl groups) that bond with the organic layer, thereby strengthening the interfacial binding force and preventing cracks from propagating between layers.
Solution Approach 2:
The encapsulating structure employs a composite material system consisting of inorganic encapsulating layers, organic encapsulating layers, and amphiphilic cross-linking layers. Each material component contributes its unique properties: the inorganic layers provide barrier properties, the organic layers provide flexibility and stress relief, and the amphiphilic cross-linking layers provide strong interfacial adhesion, collectively enhancing the overall reliability and strength of the encapsulation.
2Object-affected harmful factors
If inorganic encapsulating layers are used, then moisture and oxygen barrier is provided, but cracks develop reducing service life
Solution Approach 1:
The encapsulating structure incorporates flexible organic encapsulating layers and amphiphilic cross-linking layers between the rigid inorganic encapsulating layers. These flexible components can accommodate thermal expansion and mechanical stress without cracking, thereby maintaining the integrity of the moisture and oxygen barrier over extended service periods and preventing crack formation that would compromise the barrier function.
Solution Approach 2:
The composite encapsulating structure combines rigid inorganic layers that provide excellent moisture and oxygen barrier properties with flexible organic layers and amphiphilic cross-linking layers that prevent crack development. This composite architecture maintains the barrier function against harmful factors while extending the service life by preventing crack propagation that would otherwise compromise the encapsulation integrity.
3Reliability
If multiple encapsulating layers are stacked, then encapsulation effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The encapsulating structure is segmented into distinct functional layers: inorganic encapsulating layers for barrier properties, organic encapsulating layers for flexibility, and amphiphilic cross-linking layers for interfacial adhesion. Each segment performs a specific function, allowing for optimized manufacturing processes for each layer type while maintaining overall encapsulation effectiveness. The segmentation enables independent optimization of each layer's fabrication parameters.
Solution Approach 2:
The amphiphilic cross-linking layer serves multiple functions simultaneously: it provides strong adhesion between inorganic and organic layers, acts as a crack propagation barrier, and contributes to the overall moisture and oxygen barrier properties. This multi-functionality reduces the need for additional separate layers, thereby managing manufacturing complexity while maintaining high encapsulation effectiveness.
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
The enhanced bonding between inorganic and organic layers prevents cracks and separation, thereby reducing the exposure of encapsulated elements to moisture and oxygen, extending the service life of OLED devices by providing a stronger and more reliable encapsulation.
Implementation Method 1
the first amphiphilic cross-linking sublayer comprises a first cross-linking material comprising a plurality of first functional groups reactive with the first inorganic encapsulating sublayer and a plurality of second functional groups reactive with the first organic encapsulating sublayer
Implementation Method 2
the first amphiphilic cross-linking sublayer comprises a first cross-linking material comprising a plurality of first functional groups reactive with the first inorganic encapsulating sublayer and a plurality of second functional groups reactive with the first organic encapsulating sublayer
Implementation Method 3
the plurality of first chemical bonds are a plurality of first covalent bonds; and the plurality of second chemical bonds are a plurality of second covalent bonds
Data Source
AI summary
A display panel. The display panel includes a base substrate; a plurality of light emitting elements on the base substrate; and an encapsulating structure encapsulating the plurality of light emitting elements. The encapsulating structure includes a first inorganic encapsulating sublayer; a first organic encapsulating sublayer; and a first amphiphilic cross-linking sublayer between the first inorganic encapsulating sublayer and the first organic encapsulating sublayer.