Epoxy Sealing Material for OLED Displays
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Solution Overview
Problem
Sealing members used in organic EL displays, such as those described in Patent Document 1, exhibit high permittivity, leading to malfunctions in touch panels and require transparency, which existing compositions fail to adequately provide.
Innovation Solution
A sealing material comprising a resin component with biphenyl skeleton-containing epoxy resin, alicyclic skeleton-containing epoxy resin, and styrene oligomer, along with an optional aliphatic hydrocarbon resin, to form a sealing member with reduced permittivity and maintained transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing composition is used, then sealing performance is achieved, but permittivity becomes too high causing touch panel malfunction
Solution Approach 1:
The patent changes the chemical composition parameters of the sealing material by incorporating specific resins (biphenyl type, alicyclic type, and styrene oligomer) in controlled ratios. This composition adjustment directly reduces the permittivity parameter of the cured sealing member to below 3.5, preventing touch panel malfunction while maintaining sealing effectiveness.
Solution Approach 2:
The patent creates a composite sealing material system combining multiple resin types (biphenyl epoxy resin, alicyclic epoxy resin, and styrene oligomer) with complementary properties. This composite approach allows the sealing member to achieve low permittivity through the styrene oligomer content (5-25 mass%) while maintaining structural integrity and sealing performance through the epoxy resin matrix.
2Illumination intensity
If sealing member is made transparent, then appearance requirement is met, but permittivity increases causing malfunction
Solution Approach 1:
The patent adjusts the chemical composition parameters to achieve a transparent appearance while controlling permittivity. The specific resin combination and ratios (particularly styrene oligomer at 5-25 mass%) create a cured sealing member with both high transparency and low permittivity, resolving the trade-off between appearance and electrical properties.
Solution Approach 2:
The patent applies different functional properties to different aspects of the sealing material: the resin composition provides local transparency quality for appearance requirements, while the styrene oligomer content provides local low permittivity quality for touch panel compatibility. This differentiated property distribution resolves the contradiction between transparency and permittivity.
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 proposed sealing material effectively reduces permittivity and ensures high transparency in the sealing member, addressing the malfunctions and transparency issues in organic EL displays.
Implementation Method 1
a resin component and a curing agent, wherein the resin component contains biphenyl skeleton-containing epoxy resin having a weight-average molecular weight of 200 or more and 100,000 or less, alicyclic skeleton-containing epoxy resin having a weight-average molecular weight of 180 or more and 790 or less
Implementation Method 2
the resin component contains biphenyl skeleton-containing epoxy resin and styrene oligomer, and therefore a sealing member with a relatively low permittivity and reliable transparency can be formed
Data Source
AI summary
The image display device sealing material contains a resin component and a curing agent, wherein the resin component contains biphenyl skeleton-containing epoxy resin having a weight-average molecular weight of 200 or more and 100,000 or less, alicyclic skeleton-containing epoxy resin having a weight-average molecular weight of 180 or more and 790 or less, and styrene oligomer having a weight-average molecular weight of 750 or more and 4000 or less.