Touch Screen Routing Wire Anti-Scratch Protection
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Solution Overview
Problem
Capacitive touch screen panels face issues with the low hardness of routing wires, leading to scratches and potential shorting or opening during the manufacturing process, which can result in failed touch operations.
Innovation Solution
Incorporating an anti-scratch layer made of transparent conductive material, such as ITO, IZO, or GZO, on the insulation pattern covering the routing wires to prevent scratches and improve durability, while maintaining electrical isolation from electrode patterns and pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If routing wires are made thin and flexible for electrical connection, then electrical conductivity is improved, but hardness decreases making them susceptible to scratches
Solution Approach 1:
The patent applies composite materials by combining the soft routing wire (for electrical conductivity) with a hard insulation layer (for mechanical protection). The insulation layer is formed to have a higher hardness than the routing wire, creating a composite structure where each material performs its optimal function - the routing wire provides electrical connection while the insulation layer prevents scratches and mechanical damage.
2Reliability
If insulation layer is made thick for better electrical isolation, then electrical insulation performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the thickness parameter of the insulation layer to achieve the minimum required electrical insulation performance. By carefully selecting and controlling the thickness parameter within a specific range, the patent achieves adequate electrical isolation without excessive thickness that would complicate manufacturing processes.
3Strength
If anti-scratch layer is added to protect routing wires, then hardness and scratch resistance are improved, but device complexity increases
Solution Approach 1:
The patent makes the insulation layer serve multiple functions: electrical insulation and mechanical protection against scratches. By designing the insulation layer with higher hardness than the routing wire and positioning it to cover the routing wire, the same layer provides both electrical isolation and mechanical protection, eliminating the need for a separate anti-scratch layer and reducing overall device complexity.
Data Source
AI summary
A touch screen panel according to an embodiment includes a substrate; an electrode forming part including a plurality of first electrode serials arranged in parallel in a first direction and a plurality of second electrode serials arranged in parallel in a second direction to cross the first direction, and each of the first electrode serials including a plurality of first electrode patterns, each of the second electrode serials including a plurality of second electrode patterns; and a routing wire forming part formed on the substrate outside the electrode forming part, and including a plurality of first routing wires connected to the plurality of first electrode serials, respectively and a plurality of second routing wires connected to the plurality of second electrode serials, respectively.