Touch Screen Panel Connection Lines for Selective Etching Protection
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Solution Overview
Problem
Existing touch screen panels face challenges in preventing damage to sensing cells formed of transparent conductive layers during the manufacturing process, particularly when forming connection lines, which can affect the panel's performance and longevity.
Innovation Solution
The use of a metal layer with higher ionicity than the transparent conductive layer, such as aluminum, is implemented, along with a method of selectively etching the metal layer to expose the transparent conductive layer, thereby reducing damage to the sensing cells and improving the panel's connectivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent conductive layer is used to form sensing cells, then the sensing cells can detect position information, but the layer is susceptible to damage during manufacturing processes
Solution Approach 1:
The patent employs a composite structure where a metal layer with higher ionicity is combined with a transparent conductive layer to form connection lines. The metal layer serves as a protective and conductive composite material that reduces damage to the underlying transparent conductive sensing cells during manufacturing processes while maintaining electrical connectivity.
Solution Approach 2:
The patent changes the ionicity parameter of the connection line material by selecting a metal with higher ionicity than the transparent conductive layer. This parameter change enables selective etching behavior where the metal layer can be selectively removed or protected during manufacturing, thereby reducing damage to the sensing cells.
2Reliability
If connection lines are formed with metal layers, then conductivity is improved, but selective etching becomes difficult without damaging transparent conductive layers
Solution Approach 1:
The patent utilizes the difference in ionicity parameter between the metal layer and transparent conductive layer to enable selective etching. By choosing a metal with significantly higher ionicity, the etching process can selectively remove or modify the metal layer while leaving the transparent conductive sensing cells intact, achieving both good conductivity and manufacturing precision.
Solution Approach 2:
The patent applies different material properties to different parts of the connection line structure. The metal layer with higher ionicity provides enhanced conductivity in the connection line regions while the transparent conductive layer maintains sensing functionality, creating local quality differences that enable selective processing.
3Reliability
If transparent conductive layers are used for sensing cells, then position detection is enabled, but connection lines require additional metal layers that increase manufacturing complexity
Solution Approach 1:
The metal layer with higher ionicity serves multiple functions simultaneously: it provides enhanced electrical conductivity for connection lines, acts as a protective barrier during manufacturing processes, and enables selective etching capability. This multi-functionality reduces the need for separate protective layers, thereby simplifying the overall device structure despite the added material.
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 enhances the touch screen panel's performance by reducing damage to sensing cells and improving the connection lines' conductivity and durability, leading to more reliable position detection and extended panel lifespan.
Implementation Method 1
a method of selectively etching the metal layer to expose the transparent conductive layer
Data Source
AI summary
A touch screen panel includes a substrate including an active area and a non-active area surrounding the active area, sensing cells disposed in the active area, the sensing cells comprising a first transparent conductive layer, and connection lines disposed in the non-active area, the connection lines comprising a lower pattern comprising the first transparent conductive layer and an upper pattern disposed on the lower pattern and comprising a metal layer, in which an ionicity of the metal layer is greater than an ionicity of the first transparent conductive layer.