Interleaved Electrode Pattern for Touch Sensor Sensitivity
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Solution Overview
Problem
Capacitive touch sensors face challenges in precision and linearity due to low sensitivity zones and noise interference, which affect the accurate detection of touch positions, especially for small objects like styluses.
Innovation Solution
The use of electrodes arranged in specific patterns with conductive bridges and interleaved segments on multiple substrates increases the surface area where drive and sense electrodes are adjacent, improving sensitivity and reducing low-sensitivity zones, while also enhancing capacitive coupling through optimized electrode configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrode patterns are used, then the touch sensor structure is simple, but sensitivity is reduced and low-sensitivity zones appear
Solution Approach 1:
The electrode structure is segmented into multiple interleaved segments on different substrates, with conductive bridges connecting them. This segmentation creates multiple adjacent electrode pairs that increase the overall sensitive area and eliminate low-sensitivity zones while maintaining detection precision.
Solution Approach 2:
The electrode pattern extends into the third dimension by using multiple stacked substrates with electrodes on different layers. This vertical arrangement increases the effective electrode surface area and creates additional capacitive coupling paths, improving sensitivity without increasing the planar footprint.
2Measurement precision
If electrode surface area is increased to improve sensitivity, then detection precision improves, but noise interference increases
Solution Approach 1:
Different regions of the electrode structure have optimized local characteristics. The conductive bridges provide localized capacitive coupling paths that enhance signal strength in specific areas, while the interleaved segment arrangement creates localized sensitivity zones that can be independently optimized to reduce noise.
Solution Approach 2:
The conductive bridges act as intermediaries between the drive and sense electrodes, providing controlled capacitive coupling paths. These intermediaries enhance the signal transmission while the structured arrangement helps filter out noise through the interleaved segment configuration.
3Measurement precision
If capacitive coupling is enhanced to improve signal strength, then detection precision improves, but false positives increase
Solution Approach 1:
The electrode configuration creates dynamic capacitive coupling through the conductive bridges that can be selectively activated. The interleaved segment structure allows the system to dynamically distinguish between true touch signals and noise by analyzing the pattern of capacitive changes across multiple electrode pairs, reducing false positives while maintaining sensitivity.
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 enhances the precision and linearity of touch sensing by increasing the minimum delta capacitance values, allowing for better differentiation between noise and actual touches, and improving the detection of small objects, thus reducing false positives and negatives.
Implementation Method 1
When an object touches or comes within proximity of the surface of the capacitive touch screen, a change in capacitance may occur with the touch screen at the location of the touch or proximity.
Implementation Method 2
enhancing capacitive coupling through optimized electrode configurations
Data Source
AI summary
In certain embodiments, a touch sensor includes a first electrode and a second electrode. The second electrode is interleaved with the first electrode. The touch sensor further includes a third electrode. The third electrode surrounds the first electrode and the second electrode. The first, second, and third electrodes of the touch sensor form a capacitive node.