Foldable Display Adhesive Layer With Low Creep and High Peel Force
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Solution Overview
Problem
Display devices that can be deformed during use, such as folding or stretching, face issues with stress concentration in folded portions leading to potential damage or lifting of constituent elements, and adhesive layers may be compromised during manufacturing.
Innovation Solution
Incorporation of a first adhesive layer containing 0.05 wt % to 1 wt % of a silane coupling agent, represented by Chemical Formula R′—Si—(OR)3, with specific alkyl, vinyl, or amine groups, providing a peel force of 500 gf/in at room temperature and 300 gf/in at 60°C, and creep of 20% or less at 60°C, ensuring high reliability and low deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive layer is made stronger to prevent lifting and damage in folded portions, then the reliability improves, but the creep increases causing deformation at high temperature
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating a silane coupling agent at specific concentrations (0.01-10 wt%). This chemical parameter modification enables the adhesive to simultaneously achieve high reliability (peel force ≥300 gf/in at 60°C) and low creep (≤20% at 60°C), resolving the contradiction between strength and stability.
Solution Approach 2:
The patent creates a composite adhesive system by combining the base adhesive material with a silane coupling agent. This composite structure leverages the silane's ability to form cross-linked networks, providing both strong adhesion for reliability and dimensional stability for low creep performance at elevated temperatures.
2Stability of the object's composition
If the adhesive layer is made more rigid to maintain shape at high temperature, then the creep decreases, but the peel force decreases causing lifting in folded portions
Solution Approach 1:
The patent optimizes the concentration parameter of the silane coupling agent (0.01-10 wt%) to achieve the right balance. At this specific concentration range, the adhesive maintains sufficient peel force (≥300 gf/in at 60°C) while achieving low creep (≤20% at 60°C), resolving the contradiction between flexibility for adhesion and rigidity for shape stability.
Solution Approach 2:
The silane coupling agent acts as an intermediary substance that modifies the adhesive's properties. It provides cross-linking that enhances high-temperature stability without compromising adhesion, serving as a mediator between the requirement for peel strength and the requirement for creep resistance.
3Ease of operation
If the adhesive layer is made softer to accommodate folding, then the ease of operation improves, but the reliability decreases due to damage in folded portions
Solution Approach 1:
The patent modifies the chemical composition by adding silane coupling agent, which changes the adhesive's viscoelastic properties. This enables the adhesive to remain flexible enough for folding operations while developing sufficient strength through cross-linking to prevent damage and lifting in folded portions, achieving both ease of operation and reliability.
4Force
If the concentration of silane coupling agent is increased to improve adhesion, then the peel force increases, but the manufacturing precision decreases due to stamping and pressing defects
Solution Approach 1:
The patent precisely controls the silane coupling agent concentration within the range of 0.01-10 wt%. This optimized parameter range provides sufficient peel force (≥300 gf/in at 60°C) while maintaining low viscosity during manufacturing, preventing stamping and pressing defects and ensuring manufacturing precision.
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 layer maintains high peel force and low creep, reducing manufacturing defects and ensuring reliable performance in high temperature and humidity conditions, suitable for foldable display devices with a radius of curvature of 1.5 R or more.
Implementation Method 1
the first adhesive layer contains 0.05 wt % to 1 wt % of a silane coupling agent
Implementation Method 2
a first adhesive layer between the display panel and the protection layer
Data Source
AI summary
The present disclosure relates to a display device including a display panel, a protection layer on the display panel, and a first adhesive layer between the display panel and the protection layer. The first adhesive layer may contain 0.05 wt % to 1 wt % of a silane coupling agent, and the first adhesive layer may have creep of 20% or less at 60° C.