Conductive Sheet Electrode Segmentation for Accurate Touch Detection
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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 visibility of break parts in net-like electrodes, particularly when uniform conductive regions are touched, leading to closed electric force lines and decreased detection performance.
Innovation Solution
A conductive sheet with electrode patterns made of metal thin wires, featuring alternating conductive and nonconductive patterns, where the nonconductive patterns are strategically placed to avoid line closure and enhance detection accuracy while maintaining visibility, with specific area and width ratios optimized for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal thin wires are used to form transparent electrode patterns, then transparency is improved, but detection accuracy deteriorates due to closed electric force lines
Solution Approach 1:
The conductive pattern is segmented into multiple conductive line segments separated by nonconductive line segments. This segmentation prevents the formation of closed electric force lines while maintaining transparency, as the broken conductive paths allow electric field lines to extend beyond the pattern boundaries rather than closing within them.
Solution Approach 2:
The electrode pattern employs alternating conductive and nonconductive segments with specific width ratios. The nonconductive segments are strategically positioned to disrupt closed electric force lines, while the conductive segments maintain sufficient connectivity for electrical function. This local variation in conductivity creates optimal detection accuracy without sacrificing overall transparency.
2Reliability
If uniform conductive regions are used for electrodes, then electrical conductivity is improved, but detection performance deteriorates due to closed electric force lines
Solution Approach 1:
The uniform conductive region is divided into discrete conductive line segments separated by nonconductive segments. This segmentation maintains electrical conductivity through the continuous conductive paths while preventing closed electric force lines, as the nonconductive gaps allow electric field lines to extend outward rather than forming closed loops within the conductive region.
Solution Approach 2:
Instead of creating a uniform conductive region that naturally forms closed electric force lines, the invention inverts the approach by introducing nonconductive segments within the conductive pattern. This inversion disrupts the closed field line formation while maintaining sufficient conductivity through the distributed conductive segments.
3Measurement precision
If break parts are formed in net-like electrodes, then detection accuracy is improved, but visibility deteriorates due to observable opening portions
Solution Approach 1:
The electrode pattern uses alternating conductive and nonconductive segments where the nonconductive segments serve as the break parts for detection accuracy while being visually integrated into the overall pattern. The systematic arrangement of these segments prevents them from forming noticeable patterns or gaps, maintaining visibility while achieving the detection accuracy benefits of broken conductive paths.
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 high detection accuracy and maintains visibility by ensuring that electric force lines are not closed, allowing reliable electrostatic capacitance changes to be recognized, thus enhancing the touch panel's responsiveness and recognition of finger contact.
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.