Flexible Touch Panel with Light-Shielding Structure
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Solution Overview
Problem
Current touch panels face challenges in achieving flexibility with transparent conductive materials and incur high costs due to expensive decorative layers, while also experiencing issues with wire offset during manufacturing.
Innovation Solution
A touch panel design incorporating a substrate with a conductive wire structure layer and a light-shielding structure formed by a first and second material layer, where the second material layer extends to cover the conductive wire structure layer and has a low optical density, reducing production costs and minimizing wire offset through the use of polyvinyl chloride, polyethylene terephthalate, and catalytic layers with metal nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal oxide transparent wires (ITO, IZO, CTO, AZO) are used, then electrical conductivity and transparency are achieved, but flexibility requirements cannot be satisfied
Solution Approach 1:
The patent changes the material parameters from traditional metal oxides to polymer-based conductive materials (such as PEDOT:PSS, polyaniline, polypyrrole) that inherently possess both electrical conductivity and flexibility. This parameter change in material composition resolves the contradiction between maintaining electrical performance and achieving flexibility.
Solution Approach 2:
The patent employs composite material structures combining conductive polymers with flexible substrate materials (such as PET, PEN, or PI). This composite approach integrates the electrical conductivity of polymer materials with the mechanical flexibility of flexible substrates, simultaneously achieving both required properties.
2Reliability
If expensive ink materials are used for the decorative layer, then adequate light shielding and separation of peripheral area are achieved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive ink materials with cost-effective alternatives such as metal oxide layers or polymer-based light-shielding materials that can be applied through conventional manufacturing processes. These cheaper materials achieve the required optical density and light shielding performance without increasing manufacturing cost.
Solution Approach 2:
The patent changes the material parameters of the decorative layer from expensive organic ink to inorganic or polymer materials with controlled optical properties. By adjusting the thickness and composition parameters of these alternative materials, adequate light shielding is achieved at lower cost.
3Productivity
If wire offset occurs during manufacturing, then manufacturing precision deteriorates, but production continuity is maintained
Solution Approach 1:
The patent incorporates preliminary positioning structures such as alignment marks, registration patterns, or pre-defined conductive traces on the flexible substrate before the main manufacturing steps. These preliminary features guide subsequent processing steps and ensure accurate wire positioning, preventing offset during manufacturing while maintaining production flow.
Solution Approach 2:
The patent implements feedback mechanisms through real-time monitoring of wire placement and positioning during manufacturing. Sensors detect wire position and provide feedback to control systems that can make immediate adjustments, ensuring manufacturing precision is maintained throughout production without interrupting the manufacturing process.
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 provides a cost-effective and flexible touch panel with improved wire positioning, reducing electrostatic discharge and electron migration risks while maintaining visibility by using materials with distinct optical refractive indices for the light-shielding structure.
Implementation Method 1
a catalytic layer is further included and disposed between the conductive wire structure layer and the substrate, between the peripheral trace structure layer and the substrate, or a combination thereof... a material of the catalytic layer includes metal nanoparticles
Implementation Method 2
The light-shielding structure includes a first material layer and a second material layer, in which an optical density of the light-shielding structure is lower than 4
Implementation Method 3
an optical refractive index of the first material layer is different from an optical refractive index of the second material layer
Data Source
AI summary
A touch panel is provided in the present disclosure, including: a substrate, a conductive trace structure, and a light-shielding structure. The substrate includes a visible area and a peripheral area, and the visible area is surrounded by the peripheral area. A conductive trace structure is disposed on the visible area. The light-shielding structure includes a first material layer and a second material layer, in which the optical density of the light-shielding structure is lower than 4, the first material layer is disposed on the peripheral area, and the second material layer is disposed on the first material layer. A method of manufacturing a touch panel is provided in some embodiments of the present disclosure for the effects of saving cost and improving wire drift.