Touch Sensor Asymmetric Electrode Widths for Recognition Rate
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Solution Overview
Problem
Current touch sensors in display devices face challenges in improving touch recognition rates due to limitations in sensor design and electrode configurations, leading to inaccuracies in detecting continuous touch inputs and recognizing touch coordinates.
Innovation Solution
The proposed touch sensor design includes a base layer with alternating first and second touch sensor columns and sensing lines, where the sub-touch electrodes and second touch electrodes have different widths, enhancing the detection of mutual capacitance changes for improved touch recognition by increasing the side signal when the second touch electrode is touched, thus enhancing the touch recognition rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional touch sensor electrode configurations are used, then the structure is simple and easy to manufacture, but the touch recognition rate is low due to insufficient side signal generation
Solution Approach 1:
The patent applies asymmetry by configuring touch sensor columns with alternating electrode widths. Specifically, in each touch sensor column, odd-numbered touch electrodes have a first width while even-numbered touch electrodes have a second width that is greater than the first width. This asymmetric design creates different capacitance values for adjacent electrodes, generating a detectable side signal when touched, thereby improving touch recognition rate without requiring complex additional components
Solution Approach 2:
The patent implements local quality by varying the width of touch electrodes at specific locations within the sensing region. The electrode width is locally adjusted based on position - odd-numbered electrodes maintain a standard width while even-numbered electrodes have an increased width. This localized modification creates spatially varying capacitance characteristics that enable side signal generation for touch detection, resolving the contradiction between simple structure and high recognition rate
2Measurement precision
If uniform width electrodes are used across all touch sensor columns, then manufacturing is simplified, but accuracy in detecting continuous touch inputs and recognizing touch coordinates is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the physical dimension (width) of touch electrodes to create distinct capacitance values. Specifically, even-numbered touch electrodes are designed with a greater width than odd-numbered electrodes, creating alternating capacitance patterns across the touch sensor columns. This parameter variation enables more accurate detection of touch coordinates and continuous touch inputs while maintaining a relatively simple fabrication process that can be integrated into existing manufacturing workflows
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 improves the touch recognition rate by increasing the side signal when the second touch electrode is touched, allowing for accurate detection of continuous touch inputs and enhancing the accuracy of touch coordinates, outperforming conventional touch sensor layers.
Implementation Method 1
enhancing the detection of mutual capacitance changes for improved touch recognition
Data Source
AI summary
A touch sensor includes a base layer, first touch sensor columns, second touch sensor columns, and sensing lines. The base layer includes a sensing region and a non-sensing region. The first touch sensor columns extend in a first direction. The first touch sensor columns include first touch electrodes. The first touch electrodes include sub-touch electrodes in the sensing region. The second touch sensor columns include second touch electrodes in the sensing region. The second touch sensor columns are alternately arranged with the first touch sensor columns. The sensing lines are in the non-sensing region. The sensing lines include: first sensing lines electrically connected to the sub-touch electrodes, and second sensing lines electrically connected to the second touch electrodes. The sub-touch electrodes and the second touch electrodes have different widths.