Flexible Display Adhesive Resin Composition for Folding Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing adhesive resins for flexible display devices face challenges in maintaining reliability during folding and bending operations due to inadequate elastic modulus and adhesion properties, particularly in varying temperature conditions.
Innovation Solution
A resin composition comprising a first (meth)acrylate monomer, a second (meth)acrylate monomer with specific substituents, a urethane (meth)acrylate oligomer, and a photoinitiator, with a viscosity range of 5 cP to 50 cP, which forms an adhesive layer with a storage elastic modulus of 1.0×10^3 Pa to 1.0×10^6 Pa at 25°C, exhibiting improved adhesion and temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive resins are used in flexible display devices, then the adhesive layer can be formed, but the adhesive layer exhibits high elastic modulus and poor adhesion, leading to reliability issues during folding and bending operations
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive resin by incorporating specific monomers (acrylate or methacrylate with phosphate ester group) and controlling the ratio of oligomer to monomer content. This composition adjustment reduces the elastic modulus of the cured adhesive layer, improving its flexibility and adhesion performance during folding operations while maintaining reliable bonding
Solution Approach 2:
The patent creates a composite adhesive system by combining urethane (meth)acrylate oligomers with specific (meth)acrylate monomers containing phosphate ester groups. This composite composition achieves synergistic effects where the oligomer provides structural framework and the monomer enhances flexibility and adhesion, resolving the contradiction between strength and reliability
2Ease of operation
If the adhesive layer is made more flexible to improve folding reliability, then adhesion characteristics improve, but the elastic modulus decreases, potentially compromising structural stability
Solution Approach 1:
The patent optimizes the elastic modulus parameter within a specific range (1.0×10³ Pa to 1.0×10⁶ Pa at 25°C) by adjusting the oligomer-to-monomer ratio and selecting specific monomer structures. This parameter control achieves the right balance between flexibility for folding operations and sufficient structural stability for device integrity
Solution Approach 2:
The patent introduces local flexibility through the phosphate ester group-containing monomers at specific locations in the adhesive layer, while the urethane (meth)acrylate oligomer backbone maintains overall structural stability. This local quality adjustment allows the adhesive to exhibit different mechanical properties in different aspects, resolving the contradiction between flexibility and stability
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 ensures reliable adhesion and flexibility of the adhesive layer, maintaining stability and performance even after repeated folding and unfolding of the display device, with enhanced elastic modulus stability across different temperatures.
Implementation Method 1
at least one photoinitiator
Data Source
AI summary
A resin composition includes a first (meth)acrylate monomer a second (meth)acrylate monomer containing an oxy group or a divalent alkyl group, a urethane (meth)acrylate oligomer, and at least one photoinitiator. A content of the first (meth)acrylate monomer is about 1.6 to about 4.7 times greater than a content of the urethane (meth)acrylate oligomer.