Photocurable Resin Composition for Flexible Display Adhesion
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Solution Overview
Problem
Existing adhesive resins for flexible display devices do not offer suitable coatability and adhesion properties, particularly in devices that can be folded, bent, or rolled, necessitating improvements in viscosity, elastic modulus, and adhesion characteristics.
Innovation Solution
A resin composition comprising a monofunctional (meth)acrylate monomer, organopolysiloxane, and a photoinitiator, with specific viscosity, elastic modulus, and adhesion properties, allowing for low-viscosity application and high adhesion after curing, suitable for flexible display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive resins are used, then basic bonding is achieved, but coatability and adhesion properties are insufficient for flexible display devices
Solution Approach 1:
The patent adjusts the viscosity parameter of the adhesive resin to fall within a specific range (5-50 mPa·s at 25°C) to achieve both low-viscosity application and high adhesion after curing. This parameter optimization resolves the contradiction by enabling easy coating while maintaining reliable bonding for flexible display devices
Solution Approach 2:
The patent uses a composite resin composition containing monofunctional (meth)acrylate monomer, organopolysiloxane, and photoinitiator. This composite formulation provides both suitable coatability and excellent adhesion properties, resolving the technical contradiction through material composition rather than single-parameter adjustment
2Strength
If high adhesion is achieved, then bonding strength is improved, but viscosity and elastic modulus become unsuitable for flexible devices
Solution Approach 1:
The patent optimizes the storage modulus parameter to be at most 1 MPa at -20°C and maintains loss tangent of at least 2.0, while controlling viscosity to 5-50 mPa·s at 25°C. These parameter specifications ensure the adhesive provides sufficient bonding strength while maintaining flexibility and stability suitable for foldable display devices
Solution Approach 2:
The patent creates different functional characteristics at different stages: before curing, the adhesive has low viscosity for easy application; after curing, it achieves high adhesion with controlled elastic modulus for bonding strength. This temporal differentiation of properties resolves the contradiction between strength 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 provides excellent adhesion and flexibility, ensuring reliable bonding and impact resistance in flexible display devices, enhancing their durability and performance.
Implementation Method 1
at least one photoinitiator including a radical polymerization initiator
Implementation Method 2
an organopolysiloxane... exhibits a low-viscosity characteristics before curing and exhibits low elastic modulus and high adhesion after curing
Data Source
AI summary
A resin composition that includes at least one monofunctional (meth)acrylate monomer, an organopolysiloxane, and at least one photoinitiator including a radical polymerization initiator is provided. The resin composition may have a shear viscosity of about 5 mPa·s to about 50 mPa·s as measured at a temperature of about 25° C., a storage modulus of about 1 MPa or less as measured by dynamic viscoelasticity measurement in a shear mode at a frequency of about 1 Hz and at a temperature of about −20° C. once photocured, and a loss tangent (tan δ) of about 2.0 or more as measured by the dynamic viscoelasticity measurement once photocured, and may be optically transparent once photocured.