Flexible Touch Panel Overcoat Layer Adhesion
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Solution Overview
Problem
The production of conventional flexible panels requires an additional layer, such as a sacrificial or release layer, which increases production costs and can affect the quality if the adhesive layer contains volatile materials.
Innovation Solution
A flexible touch panel design that includes a flexible touch substrate, an overcoat layer with an adhesive force greater than 4B according to the ASTM D3359 cross-cut test, a device layer, and optionally a waterproof or optical layer, where the overcoat layer is directly contacting the substrate, allowing for direct separation from the carrier without an additional release layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an additional release layer or sacrificial layer is formed between the carrier and flexible substrate, then the flexible substrate can be separated from the carrier in subsequent processes, but the production cost increases
Solution Approach 1:
The invention extracts and eliminates the unnecessary release layer or sacrificial layer from the conventional flexible panel structure. By directly forming the flexible substrate on the carrier without these intermediate layers, the patent reduces structural complexity and production cost while maintaining the essential separation capability through direct bonding and release processes.
2Ease of manufacture
If the adhesive layer contains volatile materials to enable separation, then the flexible substrate can be released from the carrier, but the quality of the flexible panel is affected
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive layer by selecting materials without volatile components. The adhesive layer is formulated with specific polymers and curing agents that provide strong bonding during fabrication but allow clean separation without leaving residues or affecting panel quality. This parameter change eliminates the harmful effects of volatile materials while maintaining separation capability.
3Ease of manufacture
If an additional release layer is used to separate the flexible substrate from the carrier, then the separation process is enabled, but production cost increases
Solution Approach 1:
The invention merges the functions of the adhesive layer and the flexible substrate bonding into a single integrated structure. By eliminating the separate release layer and using the adhesive layer itself for both bonding and controlled separation, the patent reduces the total number of manufacturing steps and material layers, thereby lowering production cost and improving productivity.
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 design reduces production costs by eliminating the need for an additional release layer and ensures the quality of the flexible panel by maintaining the adhesive force and preventing moisture corrosion.
Implementation Method 1
an adhesive force of the overcoat layer obtained according to an ASTM D3359 cross-cut test is greater than 4B
Implementation Method 2
The waterproof layer interposed between the overcoat layer and the device layer
Data Source
AI summary
A flexible touch panel includes a flexible touch substrate, an overcoat layer, a device layer, and a waterproof layer. The overcoat layer is disposed over and directly contacting the flexible touch substrate. An adhesive force of the overcoat layer obtained according to an ASTM D3359 cross-cut test is greater than 4B. The device layer is disposed over the overcoat layer. The waterproof layer is interposed between the overcoat layer and the device layer.