Ionic Salt Adhesive for Foldable Displays
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Solution Overview
Problem
Transformable display devices face challenges in maintaining folding reliability and stability during shape transformations, which can lead to damage, and existing adhesives fail to provide adequate ion conduction and dielectric properties for high-resolution and responsive touch functionality.
Innovation Solution
An adhesive composition for foldable displays is developed, comprising a thermocurable resin, ionic salts, and a crosslinking agent, which enhances ion conduction and maintains adhering properties, with a storage modulus of 104 Pa to 106 Pa at −30° C. and 60° C., using metal or organic salts that dissociate ions to increase the relative dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive is used to ensure adhering properties for foldable display, then bonding strength is improved, but ion conduction and dielectric constant are insufficient for high-resolution touch functionality
Solution Approach 1:
The adhesive composition combines a thermocurable resin with an ionic salt to create a composite material that simultaneously provides strong adhering properties and enhanced ion conduction. The ionic salt (e.g., lithium salt) is incorporated into the resin matrix, allowing ions to move through the adhesive while maintaining bonding strength, thus resolving the contradiction between adhesion and ion conduction capabilities
Solution Approach 2:
The invention modifies the dielectric properties of the adhesive by changing the chemical composition parameters - specifically adding an ionic salt with a dielectric constant of 4 or greater. This parameter change enables the adhesive to achieve both sufficient bonding strength and the required ion conduction properties for high-resolution touch displays
2Reliability
If adhesive composition is modified to increase dielectric constant and ion conduction, then touch response is improved, but folding reliability and stability may be compromised
Solution Approach 1:
The invention optimizes the storage modulus parameter to 10^4 Pa to 10^6 Pa at both -30°C and 60°C, which provides the right balance of flexibility and stability for folding. By controlling the resin composition and ionic salt concentration, the adhesive maintains folding reliability while achieving the required dielectric constant of 4 or greater for improved touch response
Solution Approach 2:
The ionic salt is distributed within the resin matrix to create localized regions of high ion conduction without compromising the overall structural integrity. This allows different regions of the adhesive to have specialized properties - areas with higher ionic content for touch response and areas maintaining structural stability for folding reliability
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 improves dielectric constant and ion conduction, ensuring high-resolution and fast touch response in on-cell type touch panels while maintaining folding properties, reducing the risk of damage and enhancing bending reliability.
Implementation Method 1
adding an ionic salt and thereby increasing ion conduction of the adhesive composition. Particularly, when the ionic salt is favorably ion-dissociated in the adhesive composition, ion conduction increases, and a relative dielectric constant is enhanced
Implementation Method 2
a thermocurable resin; and a crosslinking agent
Implementation Method 3
a crosslinking agent, wherein the adhesive composition for a foldable display has storage modulus of 104 Pa to 106 Pa at −30° C. and 60° C. after curing
Data Source
AI summary
The present application provides an adhesive composition for a foldable display including a thermocurable resin; an ionic salt; and a crosslinking agent, wherein the adhesive composition for a foldable display has storage modulus of 104 Pa to 106 Pa at −30° C. and 60° C. after curing, an adhesive film using the same, and a foldable display including the same.