Bending Effect Electrode for Capacitive Sensor Signal Stability
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Solution Overview
Problem
Proximity sensor devices face challenges in accurately detecting input objects due to unwanted signal changes caused by bending or deflection of the sensor device, which complicates the detection of object presence and position.
Innovation Solution
Incorporating a bending effect electrode between transmitter and receiver electrodes helps reduce or eliminate these unwanted signal changes by minimizing capacitive coupling affected by deflection, allowing for more accurate object detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the proximity sensor device uses a compressible region allowing substrate deflection, then the device can be more flexible and adaptable, but bending effects cause unwanted signal changes that reduce measurement precision
Solution Approach 1:
A bending effect electrode is introduced as an intermediary element between the transmitter and receiver electrodes. This bending effect electrode is positioned in the compressible region and specifically designed to counteract the bending-induced signal changes. When the substrate deflects, the bending effect electrode experiences controlled movement that generates compensating capacitive coupling effects, thereby canceling out the unwanted signal variations caused by bending and maintaining measurement precision despite device flexibility.
2Object-affected harmful factors
If the first substrate is made deflectable to form a compressible region, then the device structure becomes more flexible, but deflection causes unwanted changes in resulting signals
Solution Approach 1:
The invention converts the harmful bending effect into a beneficial compensating effect. The bending effect electrode is strategically positioned and configured so that when the substrate deflects, the electrode's movement creates capacitive coupling changes that oppose and cancel the unwanted signal variations. By designing the bending effect electrode with specific geometry and positioning, the harmful bending-induced signal instability is transformed into a compensating mechanism that actively counteracts the distortion, thereby improving signal stability while maintaining substrate flexibility.
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 solution enhances the accuracy of input object detection by stabilizing signal readings, reducing false signals, and improving the reliability of proximity sensing in the presence of bending or pressure on the sensor device.
Implementation Method 1
The bending effect electrode helps reduce or remove unwanted changes in resulting signals caused by deflection of the first substrate towards the second substrate
Data Source
AI summary
A capacitive image sensor for detecting an input object includes a first substrate and a second substrate. A compressible region is defined between the first substrate and the second substrate. The first substrate is deflectable towards the second substrate. A transmitter electrode, receiver electrode, and bending effect electrode are disposed on the first substrate. The bending effect electrode is disposed between the transmitter electrode and receiver electrode and is configured to reduce a change in resulting signals detected from the receiver electrode caused by deflection of the first substrate towards the second substrate.