Mutual Capacitive Touch Panel Y-Axis Detection Accuracy
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Solution Overview
Problem
Conventional double-layer mutual capacitive touch panels experience detection inaccuracy in the Y-axis direction due to varying electrode density when a touching object moves in a straight line, leading to increased computational load and reduced touch accuracy.
Innovation Solution
A mutual capacitive touch panel design featuring a first electrode layer with alternatingly arranged electrode groups and a second electrode layer with overlapping electrode strip groups, separated by an insulation layer, ensures consistent detection accuracy by eliminating offset between detected and actual positions of the touching object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving series of the same column are divided into two driving series and two adjacent sensing series are electrically connected to reduce conductive lines and border width, then the number of conductive lines is reduced and border width is reduced, but sensing coordinates appear in variant density distribution when a touching object moves in a straight line along the Y-axis, resulting in detection inaccuracy
Solution Approach 1:
The patent divides each electrode group into multiple electrodes (first electrode and second electrode) that are electrically connected in series. This segmentation allows the electrode structure to maintain uniform density distribution while reducing the number of conductive lines needed to connect sensing series, thereby resolving the contradiction between device complexity and measurement precision.
Solution Approach 2:
The patent applies different configurations to different regions of the electrode structure. Specifically, the first and second electrodes within each electrode group are arranged with specific spacing and electrical connection characteristics that ensure uniform sensing density along the Y-axis, while maintaining the overall simplified conductive line structure.
2Device complexity
If conventional double-layer electrode structure is used with sensing series extending along horizontal direction, then structural design and control algorithms are simpler, but border regions at horizontal sides cannot be reduced due to necessary conductive line connections
Solution Approach 1:
The patent segments the electrode structure into multiple electrode groups with series-connected electrodes, allowing the border regions to be reduced while maintaining simple structural design and control algorithms characteristic of double-layer electrode structures.
3Measurement precision
If algorithms are used to eliminate variant density distribution issue, then detection accuracy is improved, but operation resources and processing time are consumed causing load on processor
Solution Approach 1:
The patent designs the electrode structure itself to inherently provide uniform density distribution through the series connection of multiple electrodes within each electrode group. This self-service approach eliminates the need for complex algorithms to compensate for density variations, thereby improving detection accuracy while maintaining high processing efficiency by avoiding additional computational load.
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
This design enhances touch accuracy in the Y-axis direction, reduces computational resource consumption, and improves touch response time by maintaining consistent electrode density and capacitance coupling.
Implementation Method 1
an insulation layer provided between the first electrode layer and the second electrode layer
Implementation Method 2
mutual capacitive touch panel... detecting a coupling capacitance change generated by static electricity on a touching object
Data Source
AI summary
A mutual capacitive touch panel includes a first electrode layer and a second electrode layer. The first electrode layer includes a plurality of electrode groups and a plurality of electrode groups arranged in an array. The first electrode groups located at the same column are electrically connected to a form a first electrode series, and the second electrode groups located at the same column are electrically connected to form a second electrode series. The second electrode layer includes a plurality of electrode strip groups insulated from one another and sequentially arranged along a column direction of the array, wherein each of the electrode strip groups extends along a row direction of the array and overlaps, a perpendicular projection direction, electrode groups of two adjacent rows, and two adjacent of the electrode strip groups overlap, in the perpendicular projection direction, the electrode groups of the same row.