Conductive Sheet Break-Pattern Layout for Accurate, Visible Touch Panels
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Solution Overview
Problem
Existing touch panels using metal thin wires for electrodes face issues with reduced detection accuracy and impaired visibility due to the formation of break parts in net-like electrodes, which can create observable patterns and closed electric force lines, leading to lower detection performance and visibility degradation.
Innovation Solution
A conductive sheet and touch panel design featuring electrode patterns made of metal thin wires with alternating conductive and nonconductive patterns, where the nonconductive patterns are strategically placed to avoid visible openings and ensure orthogonal alignment, thereby maintaining high detection accuracy and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal thin wires are arranged in a large number of grids to form electrodes, then surface resistance is reduced, but visibility is impaired due to observable patterns from break parts
Solution Approach 1:
The patent applies asymmetry by making break parts asymmetric in shape (e.g., L-shaped, U-shaped, or irregular patterns) rather than symmetric circular openings. This asymmetric design disrupts the formation of recognizable patterns when viewed from a distance, thereby maintaining visibility while preserving the electrical separation function of the break parts.
Solution Approach 2:
The patent applies local quality by varying the shape, size, and distribution of break parts at different locations within the electrode grid. Different regions have differently configured break parts optimized for their specific functional requirements, allowing the electrode to maintain both low surface resistance and high visibility across different viewing conditions.
2Measurement precision
If break parts are formed in net-like electrodes to electrically separate conductive patterns, then detection accuracy is improved, but visibility is impaired due to observable opening portions
Solution Approach 1:
The patent applies asymmetry by designing break parts with asymmetric shapes (L-shaped, U-shaped, irregular patterns) that do not form recognizable patterns when viewed from a distance. This maintains visibility while preserving the electrical separation function needed for accurate touch detection.
Solution Approach 2:
The patent applies color changes by coating the break parts with transparent or translucent materials that have different optical properties from the surrounding conductive patterns. This allows the break parts to blend visually with the background while maintaining their electrical separation function, thus improving visibility without compromising detection accuracy.
3Ease of manufacture
If a uniform conductive region is used for the upper electrode, then manufacturing is simplified, but detection performance is reduced due to closed electric force lines
Solution Approach 1:
The patent applies segmentation by dividing the uniform conductive region into multiple separated conductive patterns through the introduction of break parts. This segmentation creates open electric force lines that improve detection performance while still allowing for relatively simple manufacturing processes using standard electrode fabrication techniques.
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 enhances detection accuracy and maintains visibility by preventing closed electric force lines and optimizing electrostatic capacitance changes, ensuring reliable touch position detection without compromising aesthetic appeal.
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
A conductive component includes a first electrode pattern made of metal thin wires, and includes a plurality of first conductive patterns that extend in a first direction alternating with first non-conductive patterns. Each first conductive pattern includes break parts in portions other than intersection parts of the thin metal wires. The conductive component further includes a second electrode pattern made of thin metal wires, and includes a plurality of second conductive patterns that extend in a second direction orthogonal to the first direction and alternating with second non-conductive patterns. Each second conductive pattern includes break parts in portions other than intersection parts of thin metal wires.