Touch Panel Wiring Layer Fabrication Sequence
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Solution Overview
Problem
Touch panels face limitations in reducing the size of non-active areas and enhancing adhesion between support members, electrode parts, and wiring parts due to damage or separation during fabrication, which restricts the reduction of wiring width and increases non-active areas not contributing to touch sensing.
Innovation Solution
A touch panel design where the wiring parts are formed before the electrode parts, with a conductive layer structure including a support member, electrode parts, and wiring parts, where the electrode parts are partially disposed on the wiring parts, and the wiring parts are formed using a metal layer by deposition and patterning, reducing the width of the non-active area by forming the wiring parts on the support member first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode part is formed first and then the wiring part is formed thereon, then the electrode part can be properly positioned, but the electrode part may be damaged or separated during wiring part fabrication
Solution Approach 1:
The wiring part is formed first on the support member, and then the electrode part is formed on top of the wiring part. This reversed sequence prevents damage to the electrode part during wiring fabrication and ensures proper adhesion between all components.
Solution Approach 2:
The conventional fabrication sequence is inverted: instead of forming the electrode part first followed by the wiring part, the wiring part is formed first, then the electrode part is formed on top. This inversion resolves the damage and adhesion issues.
2Area of stationary object
If the wiring part width is reduced to minimize non-active area, then the active area increases, but the wiring part becomes difficult to fabricate without damaging the electrode part
Solution Approach 1:
The wiring part is formed first as a preliminary structure, allowing precise control of its width and position before the electrode part is formed on top. This enables optimization of the wiring width to minimize non-active area while maintaining manufacturability.
Solution Approach 2:
By forming the wiring part in a different fabrication step and using different material layers, the design moves to a multi-dimensional approach where the wiring part width can be independently optimized without constraining the electrode part formation.
3Reliability
If the wiring part is formed on the electrode part, then the connection is established, but the electrode part is damaged or separated during the process
Solution Approach 1:
The wiring part is formed first as a preliminary structure, and then the electrode part is formed on top of it. This sequence ensures that the electrode part is not damaged or separated during wiring fabrication, while still establishing proper electrical connection between the wiring part and electrode part.
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 stability and adhesion of both electrode and wiring parts, reduces the non-active area, and prevents damage or separation during fabrication, thereby improving touch sensitivity and user experience by minimizing the non-active region.
Implementation Method 1
The wiring part may include a metal layer formed by deposition
Data Source
AI summary
A touch panel has an active area and a non-active area disposed at an outer side of the active area defined therein. The touch panel includes a support member and a conductive layer formed on the support member and including an electrode part in the active area to sense touch and a wiring part disposed in the non-active area to be connected to the electrode part. In the non-active area, the wiring part is disposed on the support member and the electrode part is partially disposed on the wiring part.