Touch Panel Adhesive Layer Benzotriazole Ion Migration
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Solution Overview
Problem
Conductive films with fine metal wires in touch panels face issues with ion migration and electrical resistance changes, leading to circuit disconnection and malfunction, which existing methods like adhesive layers with 5-methyl-1H-benzotriazole do not adequately address, especially when fine metal wires are thinned.
Innovation Solution
A layered body for touch panels is developed with fine metal wires and an adhesive layer containing a benzotriazole-based compound, where the metal amount per unit area is between 0.010 g/m² to 10 g/m² and the benzotriazole content is between 0.05 mass % to 1.5 mass %, without a carboxyl group, to inhibit ion migration and stabilize electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the metal amount in fine metal wires is reduced to achieve higher transparency and finer wiring, then the transparency and wiring density are improved, but ion migration occurs and electrical resistance increases leading to circuit disconnection
Solution Approach 1:
A protective layer containing a benzotriazole-based compound is introduced as an intermediary between the fine metal wires and the environment. This protective layer specifically inhibits ion migration from the metal wires without significantly affecting transparency, thereby resolving the contradiction between using thinner metal wires for transparency and preventing ion migration for reliability.
Solution Approach 2:
The invention changes the chemical composition parameters by introducing a benzotriazole-based compound with specific molecular structure and properties. This compound is selected based on its ability to form protective complexes with metal ions, thereby changing the chemical environment around the metal wires to prevent ion migration while maintaining the desired transparency and electrical conductivity.
2Illumination intensity
If the metal amount in fine metal wires is reduced to achieve higher transparency, then the transparency is improved, but the electrical resistance of the fine metal wire increases
Solution Approach 1:
The protective layer containing the benzotriazole-based compound acts as an intermediary that stabilizes the electrical resistance of fine metal wires. By forming a protective barrier, it prevents oxidation and ion migration that would otherwise increase resistance, thereby maintaining stable electrical conductivity even with reduced metal amounts for higher transparency.
Solution Approach 2:
The invention creates a composite structure consisting of fine metal wires combined with a protective layer containing benzotriazole-based compound. This composite material approach allows the system to achieve both high transparency (through thin metal wires) and stable electrical resistance (through the protective layer that prevents degradation).
3Reliability
If existing adhesive layers containing 5-methyl-1H-benzotriazole are used to inhibit ion migration, then ion migration is partially suppressed, but the effect is insufficient when fine metal wires are thinned
Solution Approach 1:
The invention changes the parameters of the protective compound by using benzotriazole-based compounds with specific molecular structures and properties that are more effective than 5-methyl-1H-benzotriazole. The protective layer is also applied in controlled amounts to ensure optimal protection effectiveness, thereby achieving sufficient ion migration suppression even when fine metal wires are thinned to high precision standards.
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 effectively suppresses ion migration and stabilizes electrical resistance, preventing disconnection and ensuring long-term functionality of touch panels by controlling the metal and benzotriazole amounts within specific ranges.
Implementation Method 1
the adhesive layer contains a benzotriazole-based compound... to inhibit the ion migration
Implementation Method 2
fine metal wires which are disposed on the substrate... capable of performing multipoint detection
Data Source
AI summary
The invention provides a layered body for a touch panel in which metal migration is suppressed and changes in the electrical resistance of a fine metal wire are suppressed, and a touch panel. The layered body for a touch panel of the invention is a layered body for a touch panel including a substrate, fine metal wires which are disposed on the substrate, and an adhesive layer which is disposed on the fine metal wires, in which the amount of the metal contained per unit area in the fine metal wire is in a range of 0.01 g/m2 to 10 g/m2, the adhesive layer contains a benzotriazole-based compound, and the content of the benzotriazole-based compound is in a range of 0.05 mass % to 1.5 mass % with respect to the total mass of the adhesive layer.