Resin Composition for Flexible Display Adhesive Reliability
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Solution Overview
Problem
Existing adhesive resins for flexible display devices face challenges in maintaining reliability during folding and bending operations, with issues of deformation and low adhesive strength when pressure is applied.
Innovation Solution
A resin composition comprising a combination of (meth)acrylate monomers, bifunctional urethane (meth)acrylates with specific molecular weight ratios, and a photoinitiator, applied via inkjet printing and UV-cured, which provides enhanced adhesive reliability and folding reliability by maintaining shape integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-type adhesive resin is used, then the manufacturing process is simple, but the adhesive strength and folding reliability are insufficient
Solution Approach 1:
The patent uses a composite resin composition containing multiple types of urethane (meth)acrylate oligomers with different molecular weights (first, second, and third oligomers) combined with specific monomers and photoinitiators. This multi-component composite system achieves superior adhesive strength (180-degree peel strength ≥800 gf/25mm) and folding reliability while maintaining manageable manufacturing complexity through defined composition ratios.
2Strength
If pressure is applied to the adhesive member, then bonding is achieved, but deformation occurs reducing reliability
Solution Approach 1:
The patent optimizes the molecular weight distribution and composition ratios of the resin components to achieve optimal viscosity and mechanical properties. The specific formulation with controlled molecular weight ranges ensures the adhesive maintains shape integrity under pressure while achieving strong bonding, preventing deformation during the bonding process.
3Reliability
If the adhesive member is made flexible for folding, then folding reliability improves, but adhesive strength may decrease
Solution Approach 1:
The patent employs oligomers with different molecular weights to create distinct functional zones within the adhesive layer. The lower molecular weight oligomers (first oligomer) provide flexibility and folding reliability, while the higher molecular weight oligomers (second and third oligomers) contribute to adhesive strength. This local differentiation of material properties within the composite achieves both folding reliability and strong adhesion simultaneously.
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 achieves high 180-degree peel strength and storage modulus, ensuring the adhesive member's reliability and shape maintenance even upon repeated folding and unfolding, thereby enhancing the overall performance of flexible display devices.
Implementation Method 1
a resin composition includes at least one (meth)acrylate monomer, a plurality of bifunctional urethane (meth)acrylates, and at least one photoinitiator
Data Source
AI summary
A resin composition includes at least one (meth)acrylate monomer, a plurality of bifunctional urethane (meth)acrylates, and at least one photoinitiator. The plurality of bifunctional urethane (meth)acrylates includes a first bifunctional urethane (meth)acrylate having a first weight average molecular weight, and a second bifunctional urethane (meth)acrylate having a second weight average molecular weight that is higher than the first weight average molecular weight. A first weight of the first bifunctional urethane (meth)acrylate is greater than or equal to a second weight of the second bifunctional urethane (meth)acrylate with respect to a total weight of the resin composition.