Adhesive Laminate for Detachable Touch Panel and Display
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Solution Overview
Problem
The challenge lies in efficiently detaching and reassembling image display apparatus with touch panels, as fine uneven formations on the surfaces increase bond strength, making it difficult to separate the touch panel and image display apparatus main body without damaging the surfaces and leaving adhesive residue, which hampers production efficiency and reuse.
Innovation Solution
A laminate structure with specific convex portions and adhesive layers is used, where the average height of convex portions is 80 nm to 500 nm, and the adhesive member has a substrate with distinct adhesive layers, ensuring controlled bond and peel strengths to facilitate easy detachment and removal of the adhesive without surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fine uneven formation is arranged on the surface of touch panel or image display apparatus main body, then bond strength between adhesive member and surfaces is significantly increased, but it becomes difficult to detach the touch panel and main body from each other
Solution Approach 1:
The invention divides the adhesive member into two distinct adhesive layers with different properties. The first adhesive layer has high bond strength to ensure strong adhesion to the surface with fine uneven formation, while the second adhesive layer has lower bond strength and higher extensibility to allow easy detachment. This segmentation resolves the contradiction by having different regions of the adhesive member perform different functions.
Solution Approach 2:
The invention applies different adhesive characteristics to different layers of the adhesive member. The first adhesive layer is designed with specific properties (higher bond strength) tailored for bonding to the fine uneven formation surface, while the second adhesive layer has different properties (lower bond strength, higher extensibility) tailored for facilitating detachment. This local differentiation of adhesive properties resolves the contradiction between strong bonding and easy detachment.
2Strength
If fine uneven formation with pitch of 400 nm or less is used, then bond strength tends to be greater, but removal of adhesive layer or substrate becomes difficult and surface may be damaged
Solution Approach 1:
The adhesive member is segmented into two layers where the second adhesive layer acts as a sacrificial layer that can be easily removed. This segmentation allows the first adhesive layer to maintain strong bonding to the fine uneven formation while the second layer provides a removable interface that prevents surface damage and adhesive residue on the valuable display apparatus main body.
Solution Approach 2:
The second adhesive layer functions as a disposable component that is intentionally designed to be easily removable. By making this layer detachable, the invention protects the expensive display apparatus main body surface from damage and adhesive residue, while the touch panel can be replaced if needed. This disposable approach resolves the contradiction between strong bonding and surface protection.
3Ease of manufacture
If adhesive member is used to secure touch panel and image display apparatus main body, then production cost is reduced and assembly is simplified, but correction of positional relationship becomes difficult
Solution Approach 1:
The adhesive member is divided into two layers with different detachability characteristics. The second adhesive layer is designed to be easily detachable, allowing the touch panel to be repositioned and corrected if needed during assembly. This segmentation maintains the simplicity and cost benefits of adhesive bonding while adding the flexibility to correct positional errors.
Solution Approach 2:
The adhesive member transitions from a static, permanently bonding structure to a dynamic system where the second adhesive layer can be easily detached and reattached. This dynamic property allows the assembly process to be flexible and adjustable, enabling positional corrections while maintaining the overall simplicity of adhesive-based assembly.
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
This approach allows for easier detachment of the touch panel and image display apparatus main body, along with the removal of adhesive residue, enhancing production efficiency and maintaining surface integrity, thus improving the assembly and replacement processes.
Implementation Method 1
because light reflects on the interface between the touch panel and the air layer and on the interface between the air layer and the image display apparatus main body, the visibility of the image in the display apparatus main body may be lowered
Implementation Method 2
the adhesive member has a substrate with distinct adhesive layers, ensuring controlled bond and peel strengths to facilitate easy detachment
Data Source
AI summary
An image display apparatus that that can easily separate an image display apparatus from a touch panel. The image display apparatus comprises a liquid crystal panel (image display apparatus main body), a touch panel that has a fine, uneven structure on its surface and faces the liquid crystal panel via a gap, and an adhesive member for securing these, the adhesive member comprising a substrate, a first adhesive layer, and a second adhesive layer, wherein an adhesive strength (W1) between the first adhesive layer and the liquid crystal panel is less than an adhesive strength (W3) of the first adhesive layer and the substrate, an adhesive strength (W3′) of the second adhesive layer and the substrate, and an adhesive strength (W5) of the second adhesive layer and the touch panel, and wherein a breaking strength (W4) of the substrate is greater than W3′ and/or W5.