Touch Sensor Laminate with Differential Adhesive Peel Strength
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Solution Overview
Problem
Existing touch sensor manufacturing processes face challenges in achieving mechanical reliability and flexibility, particularly in large-scale display fabrication, where the detachment of metal wiring can cause damage due to solvent use and stress, limiting the adoption in flexible display devices.
Innovation Solution
A touch sensor laminate is designed with a multi-layered structure including a touch sensor layer, a first adhesive layer with lower peel strength, a second adhesive layer with higher peel strength that reduces after light irradiation, and an optical film, allowing for controlled detachment and enhanced durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sacrificial layer is used to facilitate carrier substrate detachment, then the detachment process becomes easier, but the metal wiring may be damaged by solvent or stress during detachment
Solution Approach 1:
The patent introduces a release film as an intermediary layer between the first adhesive layer and the touch sensor layer. This release film serves as a mediator that facilitates carrier substrate detachment while protecting the metal wiring from direct exposure to solvents and stress. The release film has controlled adhesive properties that allow easy detachment from the carrier substrate while maintaining strong adhesion to the touch sensor layer, thus resolving the contradiction between ease of detachment and wiring integrity.
2Weight of moving object
If the display device is made thinner to achieve flexible property, then flexibility and light-weight are improved, but mechanical reliability and durability are reduced
Solution Approach 1:
The patent employs a composite multi-layer structure consisting of touch sensor layer, first adhesive layer, release film, second adhesive layer, and optical film. Each layer is designed with specific material properties that contribute to both flexibility and mechanical reliability. The combination of these materials creates a synergistic effect where the thin structure provides flexibility while the layered composite design maintains overall structural strength and durability, resolving the contradiction between thinness and mechanical reliability.
3Ease of operation
If the peel strength of the first adhesive layer is reduced to facilitate release film detachment, then the detachment process becomes easier, but the adhesion between release film and touch sensor layer is weakened
Solution Approach 1:
The patent applies the principle of local quality by creating different adhesive strength characteristics in different layers. The first adhesive layer has low peel strength specifically at its interface with the release film to facilitate easy detachment, while the second adhesive layer has high peel strength at its interface with the optical film to ensure strong bonding. This localized differentiation of adhesive properties allows the system to achieve both easy release film detachment and strong overall adhesion, resolving the contradiction between ease of operation and adhesion strength.
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 solution provides a substrate-less touch sensor film with improved mechanical reliability and flexibility, reducing damage during detachment and enabling its application in flexible display devices with enhanced durability and thinness.
Implementation Method 1
the second adhesive layer includes a material, a peel strength of which is reduced by a light irradiation
Data Source
AI summary
A touch sensor laminate includes a touch sensor layer, a second adhesive layer formed on an upper surface of the touch sensor layer, a first adhesive layer formed on a lower surface of the touch sensor layer, the first adhesive layer having a peel strength less than that of the second adhesive layer, a release film attached to a lower surface of the first adhesive layer, and an optical film attached on an upper surface of the second adhesive layer.