Foldable Display Adhesive Composition for Temperature Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current pressure-sensitive adhesives used in foldable displays do not adequately meet the requirements of excellent folding properties, adhesion, heat resistance, and recovery rate across various temperatures, leading to potential damage and instability in deformable display components.
Innovation Solution
A pressure-sensitive adhesive composition comprising an acrylic polymer and a crosslinking agent, specifically formulated to achieve a specific range of storage modulus at different temperatures, ensuring excellent folding properties, adhesion, and recovery rates, including the use of compounds like N,N,N,N′-tetraglycidyl-m-xylenediamine as a crosslinking agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesives are used in foldable displays, then the adhesives can provide basic adhesion and bonding, but the adhesives fail to satisfy folding reliability and folding stability requirements
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific polymers (polyacrylic acid, polyacrylonitrile, polyvinylidene fluoride) in controlled ratios, and adjusting the crosslinking agent content (0.1-5 parts by weight per 100 parts adhesive). This parameter optimization enables the adhesive to maintain both folding reliability and stability simultaneously
Solution Approach 2:
The patent creates a composite adhesive system combining multiple polymer types (acrylic-based polymers with different functional groups) and crosslinking agents. This composite structure allows the adhesive to exhibit both high folding reliability and stability by leveraging the complementary properties of each component
2Strength
If the adhesive is made more rigid to improve adhesion strength, then adhesion improves, but folding properties and recovery rate deteriorate
Solution Approach 1:
The patent applies local quality by creating regions of different polymer concentrations and crosslinking densities within the adhesive layer. The polyacrylic acid provides strong adhesion in bonding regions, while polyacrylonitrile and polyvinylidene fluoride maintain flexibility in folding regions, achieving both strong adhesion and good folding properties
Solution Approach 2:
The patent introduces dynamic characteristics through the viscoelastic properties of the polymer blend and controlled crosslinking. The adhesive can dynamically adjust its rigidity based on applied stress - showing high strength during bonding and flexibility during folding, enabling both strong adhesion and reliable folding
3Strength
If the adhesive is optimized for room temperature performance, then adhesion at room temperature improves, but heat resistance and low-temperature performance worsen
Solution Approach 1:
The patent changes the thermal parameters of the adhesive by selecting polymers with appropriate glass transition temperatures and thermal stability. The combination of polyacrylic acid, polyacrylonitrile, and polyvinylidene fluoride creates an adhesive that maintains adhesion strength from -40°C to 100°C, satisfying both room temperature performance and heat resistance requirements
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 satisfies the necessary conditions for storage modulus, adhesion, heat resistance, and recovery rate, enabling reliable and durable folding properties across temperature variations, thus enhancing the stability and performance of foldable displays.
Implementation Method 1
a crosslinking agent, specifically formulated to achieve a specific range of storage modulus at different temperatures
Implementation Method 2
satisfying a specific range of storage modulus at high temperature as well as at low temperature and room temperature, not only allows excellent folding properties to be realized but also satisfies excellent adhesion, excellent heat resistance, and excellent recovery rate requirements
Data Source
AI summary
Provided is a pressure-sensitive adhesive composition for a foldable display, more particularly, a pressure-sensitive adhesive composition for a foldable display which, by satisfying a specific range of storage modulus at high temperature as well as at low temperature and room temperature, not only allows excellent folding properties to be realized but also satisfies excellent adhesion, excellent heat resistance, and excellent recovery rate requirements at the same time.