Conductive Sheet Orthogonal Electrode Grids Touch Detection
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Solution Overview
Problem
Capacitive touch panels with uniform conductive electrodes face issues with detection accuracy due to closed electric force lines when a finger or object comes into contact, leading to incomplete touch detection.
Innovation Solution
A conductive sheet with electrode patterns made of metal thin wires, featuring intersecting grids with alternating conductive and nonconductive patterns, ensuring orthogonal alignment and specific width ratios to prevent closed electric force lines and enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform conductive region is used for the upper electrode, then the electrode structure is simple and continuous, but closed electric force lines form between electrodes when touched, preventing accurate touch detection
Solution Approach 1:
The electrode pattern is segmented into alternating conductive patterns and nonconductive patterns. This segmentation prevents closed electric force lines from forming between electrodes when touched, as the nonconductive patterns interrupt the continuous electric field paths, thereby enabling accurate touch detection while maintaining a relatively simple overall electrode structure.
Solution Approach 2:
Different regions of the electrode pattern are assigned different properties: conductive patterns provide electrical connectivity and signal transmission, while nonconductive patterns interrupt electric force lines to prevent closed loops. This local differentiation of properties resolves the contradiction by allowing both simple continuous regions and detection accuracy in different locations.
2Measurement precision
If metal thin wires are used to form the electrode pattern, then transparency is improved compared to ITO, but detection accuracy may be compromised without proper pattern design
Solution Approach 1:
The metal thin wire electrode pattern is segmented into alternating conductive and nonconductive patterns. This segmentation maintains the transparency benefits of metal thin wires while enabling accurate touch detection by preventing closed electric force lines, thus resolving the contradiction between detection accuracy and manufacturing simplicity.
3Measurement precision
If the electrode pattern has nonconductive regions, then closed electric force lines are prevented and detection accuracy improves, but the electrode structure becomes more complex
Solution Approach 1:
The electrode pattern is divided into alternating conductive patterns and nonconductive patterns. This segmentation achieves the dual benefit of preventing closed electric force lines (improving detection accuracy) while maintaining a regular, repeating structure that does not significantly increase manufacturing complexity.
Solution Approach 2:
The conductive and nonconductive patterns are merged into a single integrated electrode pattern structure with alternating regions. This unified design achieves both detection accuracy and structural simplicity, as the pattern can be manufactured as a single layer without separate components.
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 design improves detection accuracy by allowing reliable recognition of changes in electrostatic capacitance upon touch, preventing closed electric force lines and enabling precise finger position detection.
Implementation Method 1
a change in electrostatic capacitance that occurs in the electrodes is determined, whereby a position touched with a finger is detected
Data Source
AI summary
Provided are a conductive sheet and a touch panel having a high detection accuracy of touching with a finger. A conductive sheet includes: a first electrode pattern including first conductive patterns; and a second electrode pattern including second conductive patterns. The first conductive patterns and the second conductive patterns are placed so as to be orthogonal to each other. Each first conductive pattern includes slit-like sub-nonconduction patterns inside thereof.