Adhesive Composition for Foldable Displays
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Solution Overview
Problem
Foldable display devices face challenges in maintaining impact resistance and stress management due to temperature variations, as existing bonding members do not effectively absorb impacts and have high viscosity, making them difficult to apply using inkjet printing.
Innovation Solution
An adhesive composition with low viscosity and temperature-independent storage modulus is developed, comprising acrylic monomers like n-hexyl acrylate and crosslinking agents like ethylene diacrylate, which can be easily applied using inkjet printing and provides improved impact resistance by maintaining rigidity and absorbing impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing bonding members are used to protect laminated structures from external impacts, then impact resistance is improved, but viscosity is high making them difficult to apply using inkjet printing
Solution Approach 1:
The patent modifies the chemical composition parameters of the bonding member by incorporating specific monomers (acrylic, vinyl, or styrene-based) and controlled crosslinking agents. This changes the viscosity parameter to enable inkjet printing while maintaining impact resistance through optimized molecular structure and crosslinking density.
Solution Approach 2:
The bonding member is formulated as a composite material system combining multiple monomer types, crosslinking agents, and optional additives. This composite approach allows simultaneous achievement of low viscosity for printing and high impact resistance through synergistic material interactions and controlled curing characteristics.
2Strength
If bonding members are used to bond laminated structures, then structural integrity is improved, but stress caused by temperature changes is not effectively removed
Solution Approach 1:
The patent optimizes the storage modulus parameter of the bonding member by controlling monomer selection, crosslinking agent type and concentration. This parameter adjustment ensures the bonding member maintains adequate rigidity for structural integrity while remaining sufficiently compliant to accommodate thermal expansion and contraction stresses without failure.
3Strength
If high viscosity bonding members are used to maintain rigidity, then impact resistance is improved, but application process complexity increases
Solution Approach 1:
The patent carefully balances the viscosity parameter of the uncured bonding member formulation to enable straightforward inkjet printing processes. The low viscosity allows for simple dispensing and patterning operations, while the subsequent curing process develops the rigidity needed for impact resistance, thereby simplifying the overall application process.
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 adhesive composition effectively reduces stress caused by temperature changes and enhances impact resistance, allowing for efficient application and improved durability of foldable display devices.
Implementation Method 1
The bonding member produced using the adhesive composition maintains the rigidity to withstand deformation upon application of an impact and absorbs the applied impact
Implementation Method 2
the adhesive composition may comprise an acrylic monomer, and a crosslinking agent
Data Source
AI summary
An adhesive composition includes an acrylic monomer, and a crosslinking agent. A storage modulus of the adhesive composition after curing the adhesive composition at a temperature of about −20° C. divided by a storage modulus of the adhesive composition after curing the adhesive composition at a temperature of about 60° C. is be greater than about 1 and less than about 10.