Auxiliary Spreading Layer for OLED Thin Film Encapsulation
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Solution Overview
Problem
The existing thin film package structures for OLED devices suffer from unsatisfactory spreadability and filling effects of Ink-Jet Printing (IJP) Ink on inorganic layers due to hydrophilicity-hydrophobicity differences between SiNx material and organic materials like acrylate and epoxy resin, leading to inadequate isolation from water and oxygen.
Innovation Solution
Incorporating an auxiliary spreading layer with hydrophilicity-hydrophobicity matching that of the organic layers between inorganic and organic layers, formed using self-assembled non-polar hydrophobic monolayers such as propyltrichlorosilane, octadecyltrichlorosilane, or methoxy ethoxy silane, to enhance the spreadability and filling efficacy of IJP Ink on inorganic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic layers made of SiNx material are used to isolate OLED devices from air, then the isolation effectiveness is improved, but the spreadability of IJP Ink on the inorganic layers deteriorates due to hydrophilicity-hydrophobicity mismatch
Solution Approach 1:
The patent introduces an auxiliary spreading layer as an intermediary between the inorganic layer and the organic layer. This auxiliary layer has hydrophilicity-hydrophobicity properties that match the organic layer, serving as a mediator that enables the IJP Ink to spread effectively on the inorganic layer surface while maintaining the isolation effectiveness of the inorganic layer structure.
Solution Approach 2:
The patent modifies the surface property parameters of the inorganic layer by introducing the auxiliary spreading layer with matched hydrophilicity-hydrophobicity characteristics. This parameter change in surface wettability allows the IJP Ink to spread properly without compromising the isolation function of the inorganic layer.
2Reliability
If organic layers are applied to fill cracks and defects on inorganic layers, then the isolation performance is improved, but the filling effect deteriorates due to poor spreadability of IJP Ink
Solution Approach 1:
The auxiliary spreading layer acts as a mediator that enables the IJP Ink to achieve proper spreadability and filling effect. By matching the hydrophilicity-hydrophobicity of the organic layer, it ensures that the ink can effectively fill cracks and defects in the inorganic layer, thereby improving the manufacturing precision of the filling process while maintaining isolation performance.
Solution Approach 2:
The auxiliary spreading layer is applied in advance before the organic layer deposition. This preliminary action modifies the surface properties of the inorganic layer to ensure optimal spreading and filling of the subsequent IJP Ink, thereby improving the filling effect before the actual encapsulation process occurs.
3Object-affected harmful factors
If SiNx inorganic layers are used for packaging, then water and oxygen isolation is achieved, but the hydrophilic nature of SiNx causes poor wetting of hydrophobic organic materials
Solution Approach 1:
The auxiliary spreading layer serves as a mediator between the hydrophilic SiNx inorganic layer and the hydrophobic organic materials. It has surface properties that are compatible with both, enabling proper wetting and adhesion while maintaining the water and oxygen isolation capability of the inorganic layer structure.
Solution Approach 2:
The patent creates a composite structure where the auxiliary spreading layer combines properties of both hydrophilic and hydrophobic materials. This composite approach allows the system to maintain water and oxygen isolation from the SiNx layer while achieving good compatibility and wetting with the hydrophobic organic materials.
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 auxiliary spreading layer improves the spreadability and filling effect of IJP Ink on inorganic layers, effectively isolating water and oxygen, thereby prolonging the lifespan of OLED devices by ensuring better protection against environmental components.
Implementation Method 1
formed using self-assembled non-polar hydrophobic monolayers
Implementation Method 2
hydrophilicity-hydrophobicity matching that of the organic layers
Implementation Method 3
improves the spreadability and filling effect of IJP Ink on inorganic layers
Implementation Method 4
filling effect of IJP Ink on inorganic layers
Data Source
AI summary
A thin film package structure is provided. The thin film package structure includes a plurality of film layers arranged on the outside of a device, the plurality of film layers including inorganic and organic layers alternately laminated, wherein the innermost film layer and the outermost film layer among the plurality of film layers are inorganic layers, and an auxiliary spreading layer arranged between at least one pair of an inorganic layer and an organic layer adjacent within the plurality of film layers, wherein the hydrophilicity-hydrophobicity of the auxiliary spreading layer is the same as that of the organic layer in contact with the auxiliary spreading layer.