Capacitive Touch Sensor with Non-Uniform Electrode Density
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Solution Overview
Problem
Current touch sensor devices have limitations in precisely recognizing touch positions, which affects their ability to accurately draw fine pictures or small letters, as they struggle to detect linear touch positions with high accuracy.
Innovation Solution
The design includes a capacitive touch sensor device with a configuration of first and second sensing electrodes, where the density of linear electrodes decreases from the center to the outer side, forming electrode groups with varying intervals and line widths, and using transparent conductive materials or metal meshes to enhance touch position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform density electrodes are used, then manufacturing is simple, but touch position recognition precision is insufficient
Solution Approach 1:
The patent applies local quality by varying the density of linear electrodes according to position: higher density at the center region for precise touch position recognition, and lower density at outer regions. This non-uniform configuration optimizes measurement precision where it is most needed (center touch areas) while reducing unnecessary complexity in less critical regions.
2Measurement precision
If high density electrodes are used throughout, then touch position detection accuracy improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent implements local quality by configuring high-density linear electrodes only in the center region where touch detection accuracy is most critical, while using lower-density electrodes in outer regions. This approach maintains manufacturing simplicity by avoiding uniformly high-density configuration across the entire sensor surface, thus reducing manufacturing complexity and cost while preserving detection accuracy where it matters most.
3Manufacturing precision
If linear electrodes are arranged in groups with varying intervals, then fine picture and small letter recognition improves, but electrode structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing linear electrodes into multiple electrode groups with different intervals and densities. The center region contains electrode groups with smaller intervals for high-precision detection of fine pictures and small letters, while outer regions have larger intervals. This segmented approach enables differential precision across the sensor surface, improving manufacturing precision for fine details without requiring uniformly complex structure throughout.
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 configuration improves the accuracy of detecting linear touch positions, allowing for precise recognition of small touches, such as those from a pen, thereby enhancing the capability to draw fine images or small letters.
Implementation Method 1
A capacitance method that is one of the implementation methods of the touch sensor device is mainly used. The capacitance method is a method of detecting a change in capacitance formed between an electrode and a conductive object, such as a finger, according to the existence of a touch.
Data Source
AI summary
Disclosed is a touch sensor device, including: a plurality of first sensing electrodes which includes a plurality of first linear electrodes extending in a first direction and a first connection electrode connecting the plurality of first linear electrodes to each other; and a plurality of second sensing electrodes which includes a plurality of second linear electrodes extending in a second direction perpendicular to the first direction and a second connection electrode connecting the plurality of second linear electrodes to each other, in which a disposition density of the plurality of first linear electrodes included in one first sensing electrode is gradually decreased from a center of the first sensing electrode to an outer side of the first sensing electrode.