Moisture-Absorbing Resin for OLED Encapsulation
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Solution Overview
Problem
Self-luminous display devices, particularly those using organic electroluminescent materials, face challenges in maintaining reliability due to vulnerability to external factors like oxygen and moisture, which can penetrate through defects in encapsulation layers, leading to deterioration and reduced light efficiency.
Innovation Solution
A resin composition comprising a (meth)acrylate monomer, a photoinitiator, and a moisture absorbent with a hydrolysable group, which forms a copolymer with a carboxylic group, is used to create an encapsulation layer that effectively absorbs moisture and enhances the encapsulation of light-emitting elements, improving the display device's tolerance to moisture permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation layer is applied to protect light-emitting elements, then reliability against oxygen and moisture is improved, but defects in the encapsulation layer still allow penetration leading to deterioration
Solution Approach 1:
A moisture absorbent layer is introduced as an intermediary component between the encapsulation layer and the light-emitting element. This intermediate layer actively absorbs moisture that penetrates through encapsulation defects, preventing direct contact with the light-emitting element and maintaining reliability even when encapsulation is imperfect.
Solution Approach 2:
The patent changes the chemical composition parameters of the resin by incorporating specific moisture-absorbing compounds with hydrolysable groups. This parameter change enables the material to dynamically respond to moisture presence through chemical reactions, transforming the resin from a passive barrier to an active moisture-management system.
2Reliability
If a resin composition with moisture absorbent is used, then tolerance to moisture permeability is improved, but the composition complexity increases
Solution Approach 1:
The patent merges multiple functions into a single resin composition: the binder provides structural integrity, the moisture absorbent provides moisture protection, and the photoinitiator enables curing. This consolidation achieves moisture tolerance without requiring separate functional layers, thereby managing complexity while improving reliability.
Solution Approach 2:
The resin composition is designed as a composite material combining organic binder molecules with inorganic moisture-absorbing compounds. This composite approach leverages the strengths of both material types to achieve superior moisture tolerance while maintaining processability and structural requirements.
3Illumination intensity
If dark spot growth is prevented, then light efficiency is maintained, but this requires reducing moisture penetration over time
Solution Approach 1:
The moisture absorbent is pre-incorporated into the resin composition before encapsulation, positioned to actively intercept moisture as soon as it penetrates. This preliminary protective action prevents moisture from reaching the light-emitting element, thereby preventing dark spot formation and maintaining light efficiency throughout the device's operational lifetime.
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 resin composition significantly reduces the growth rate of dark spots caused by moisture penetration, thereby enhancing the reliability and maintaining light efficiency of self-luminous display devices by increasing the lag time for moisture permeation and improving the encapsulation layer's barrier properties.
Implementation Method 1
A resin composition comprising a (meth)acrylate monomer, a photoinitiator, and a moisture absorbent
Implementation Method 2
the moisture absorbent includes a hydrolysable group, and a carboxylic group after hydrolysis
Data Source
AI summary
A resin composition of an embodiment includes a (meth)acrylate monomer, a photoinitiator, and a moisture absorbent, wherein the moisture absorbent includes a hydrolysable group, and a carboxyl group after hydrolysis, thereby providing a display device with improved tolerance to moisture and moisture permeability.