Touch Panel Wiring Oxidation Protection via Metal Layer
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Solution Overview
Problem
Current touch panels face challenges in maintaining conductive functionality and preventing moisture penetration, which can lead to reliability issues and reduced lifespan, especially in multi-touch configurations with complex electrode structures.
Innovation Solution
A touch panel design featuring a transparent conductive layer with a touch-sensing portion and a wiring portion, where a metal layer is disposed on the wiring portion and covered by an insulating layer, which also serves as a light-shield, reducing the risk of oxidation and moisture ingress, and enhancing manufacturing yield and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is added to the wiring portion to improve conductivity and reduce oxidation risk, then the reliability of conductive functionality is improved, but the device complexity and manufacturing process difficulty increase
Solution Approach 1:
The patent implements a nested multi-layer structure where the metal layer is positioned between the transparent conductive layer and the insulating layer. This nesting approach protects the metal layer from oxidation while maintaining electrical conductivity, resolving the contradiction between reliability improvement and structural complexity by organizing layers in a protective hierarchy.
Solution Approach 2:
The patent combines different materials with complementary properties: transparent conductive material for conductivity and transparency, metal material for enhanced conductivity and oxidation resistance, and insulating material for protection. This composite structure resolves the contradiction by integrating materials that collectively improve reliability while managing the complexity through functional differentiation.
2Reliability
If the wiring portion is covered with insulating layer and photoresist layer to prevent moisture penetration, then the reliability and lifespan are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies the photoresist layer as a preliminary protective action before final assembly completion. This preliminary coating provides immediate moisture protection during manufacturing and assembly processes, reducing the urgency for perfect alignment precision while still achieving reliable moisture barrier functionality in the final product.
Solution Approach 2:
The patent uses thin film layers (insulating layer and photoresist layer) that can conform to the underlying wiring structure. These flexible thin films provide effective moisture protection without requiring rigid precision alignment, as they can adapt to minor variations in layer positioning while maintaining their barrier function.
3Reliability
If the insulating layer serves as a light-shield to protect metal layers, then the reliability is improved, but the transparency and slim design are compromised
Solution Approach 1:
The patent applies the light-shielding insulating layer selectively only to the wiring portion areas that require oxidation protection, rather than covering the entire touch panel. This local application maintains light transmission quality in the touch-sensing portions while providing oxidation protection where needed, resolving the contradiction between reliability and transparency through spatial differentiation of layer functions.
Data Source
AI summary
A touch panel is provided. The touch panel includes a substrate having a touch area and a peripheral area adjacent to the touch area. A transparent conductive layer is disposed on the substrate, the transparent conductive layer includes a touch-sensing portion and a wiring portion, wherein the touch-sensing portion is electrically connected to the wiring portion, and wherein the touch-sensing portion is disposed corresponding to the touch area and the wiring portion is disposed corresponding to the peripheral area. A metal layer is disposed on the wiring portion of the transparent conductive layer and corresponding to the peripheral area. An insulating layer is disposed on the metal layer and corresponding to the peripheral area. A touch display device including the touch panel is also provided.