Conductive Sheet with Dual-Lattice Metal Wire Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch panels with ITO electrodes have high resistance, leading to low current transfer rates and slow response times, especially in large devices, and the use of thin metal wires results in opaque electrodes that compromise transparency and visibility.
Innovation Solution
A conductive sheet with a pattern of thin metal wires, where larger second lattices are used for connections and smaller first lattices as dummy patterns, arranged in a specific configuration to enhance transparency, visibility, and detection sensitivity, with the option of overlapping patterns to minimize visible boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ITO electrodes are used in touch panels, then the electrodes have good transparency, but the resistance is high leading to low current transfer rate and slow response speed
Solution Approach 1:
The patent changes the material parameter from ITO (indium tin oxide) to thin metal wires (aluminum, copper, or alloy), fundamentally altering the electrical and optical properties to achieve low resistance while maintaining transparency
Solution Approach 2:
The patent uses composite structures combining thin metal wires with transparent substrates and transparent resins, creating a material that exhibits both optical transparency and electrical conductivity properties
2Reliability
If thin metal wires are used to form electrodes, then the surface resistance is lowered, but the transparency and visibility are compromised due to opaque material
Solution Approach 1:
The patent employs extremely thin metal wire films with controlled line widths (1-10 μm) and spacing, creating a mesh structure that is thin enough to maintain transparency while sufficient to provide low resistance
Solution Approach 2:
The patent creates non-uniform patterns with different lattice sizes (first lattices and second lattices) positioned at different locations, optimizing local properties for both transparency and conductivity requirements
3Ease of manufacture
If uniform lattice patterns are used throughout the electrode, then the manufacturing is simplified, but the detection sensitivity and current transfer efficiency are reduced
Solution Approach 1:
The patent implements varying lattice configurations across different regions, with first lattices (smaller size) and second lattices (larger size) positioned strategically to optimize both manufacturing feasibility and detection sensitivity
Solution Approach 2:
The electrode pattern is segmented into different lattice types (first and second lattices) with distinct functions, allowing optimization of different regions for specific purposes while maintaining overall manufacturability
Data Source
AI summary
The present invention pertains to a conductive sheet and a touch panel. A first conductive pattern and a second conductive pattern are both configured from the combination of a plurality of first lattices and a plurality of second lattices having a size that is larger than that of the first lattices. Of the first conductive pattern, the portion facing the second conductive pattern is configured from a plurality of second lattices, of the second conductive pattern, the portion facing the first conductive pattern is configured from a plurality of second lattices, and when seen from the top surface, the portions at which the first conductive pattern and the second conductive pattern are facing have a form that combines a plurality of first lattices.