Conductive Sheet Mesh Pattern for Touch Panel Visibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conductive sheets used in touch panels and display devices face issues with high surface resistance, leading to reduced response speed and visibility due to the generation of granular and color noise, especially as screen sizes increase.
Innovation Solution
A conductive sheet with a mesh pattern formed by thin metal wires, where the standard deviation of opening areas is between 0.017 mm² and 0.038 mm², and the standard deviation of centroid positions is greater than 15.0 μm, along with a specific power spectrum deviation, to minimize noise and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO is used as the conductive material, then the surface resistance is reduced, but the response speed decreases due to high electric resistance per unit area
Solution Approach 1:
The conductive sheet is divided into a mesh pattern consisting of multiple thin metal wire segments arranged in a lattice structure. This segmentation allows the use of low-resistance metal materials while maintaining overall conductive performance across the entire sheet, thereby improving response speed while keeping surface resistance low.
Solution Approach 2:
The invention uses a composite structure combining transparent base material with metal wire mesh. This composite approach leverages the low electrical resistance of metals while maintaining optical transparency, resolving the contradiction between surface resistance and response speed by integrating materials with complementary properties.
2Ease of manufacture
If mesh patterns are made with regular shapes, then the manufacturing is simplified, but color noise is generated due to regularity with pixel arrangement
Solution Approach 1:
The mesh pattern employs irregularly shaped openings rather than uniform regular shapes. This asymmetry breaks the periodic correlation between the mesh pattern and the pixel array, eliminating color noise generation while still allowing for practical manufacturing through random or pseudo-random pattern generation methods.
3Manufacturing precision
If the opening sizes in mesh pattern are made uniform, then the manufacturing precision is improved, but granular feeling of noise is recognized
Solution Approach 1:
The mesh pattern incorporates local variations in opening sizes, where different regions have different opening dimensions rather than maintaining uniform size throughout. This local quality variation suppresses granular noise perception by preventing regular patterns from forming, while still maintaining manufacturability through controlled randomization of opening dimensions within specified ranges.
Data Source
AI summary
In the mesh pattern of the conductive sheet of the invention in which openings having different shapes are arrayed in plan view, a standard deviation of an area of each of the openings is equal to or greater than 0.017 mm2 and equal to or less than 0.038 mm2, in a two-dimensional distribution of centroid positions of the openings; a standard deviation for a root mean square deviation of each of the centroid positions which are disposed along a predetermined direction, with respect to a direction perpendicular to the predetermined direction is equal to or greater than 15.0 μm; or a standard deviation over a radial direction of a value expressed by a common logarithm of a standard deviation along an angular direction in a power spectrum of the mesh pattern is equal to or greater than 0.965 and equal to or less than 1.065.