Detection Device With Spacer-Gap Separation for Zero-Force Sensing
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Solution Overview
Problem
Existing detection devices take time for the sensor layer to return to its original shape after force release, leading to prolonged current flow and delayed detection of zero force application.
Innovation Solution
Incorporation of spacers between the substrate and sensor layer to create a gap, ensuring rapid disconnection of the sensor layer from the electrodes upon force release, facilitating quicker detection of zero force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sensor layer is made to return to its original shape quickly after force release, then the detection speed is improved, but the conductive particles may not have time to separate completely, causing residual current flow
Solution Approach 1:
A gap is introduced as an intermediary element between the sensor layer and the electrode. This gap acts as a physical barrier that prevents direct contact between conductive particles and the electrode, thereby controlling current flow independently of the sensor layer's elastic recovery speed.
Solution Approach 2:
The contact interface between the sensor layer and electrode is segmented by introducing discrete contact holes rather than continuous contact. This segmentation allows controlled current flow through specific pathways while preventing residual current flow through the gap regions.
2Loss of time
If the sensor layer remains in contact with the electrode after force release, then current flow continues, but the detection device cannot quickly detect zero force application
Solution Approach 1:
The gap serves as an intermediary that decouples the sensor layer's mechanical state from the electrical contact state. Even when the sensor layer returns to its original shape, the gap prevents immediate electrical contact, allowing the system to reliably detect when no force is applied.
Solution Approach 2:
The gap is pre-configured in the structure to automatically break electrical contact before the sensor layer fully returns to its original shape. This preliminary action ensures that the detection electrode quickly registers zero force application.
3Measurement precision
If the sensor layer is continuously in contact with the electrode, then current flow is maintained, but the device cannot distinguish between applied force and residual contact
Solution Approach 1:
The contact interface is segmented into discrete contact holes rather than continuous contact. This segmentation creates distinct electrical pathways that allow precise measurement of force application while maintaining simple overall device structure.
Solution Approach 2:
The gap acts as a simple intermediary element that provides clear binary state differentiation (contact vs. non-contact) without requiring complex mechanical or electrical mechanisms, thereby maintaining measurement precision while minimizing device complexity.
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
Enhances the detection device's ability to promptly detect the absence of force by breaking electrical coupling between electrodes, improving detection accuracy and speed.
Implementation Method 1
When force is applied to the sensor layer, the body deforms, and the conductive particles come into contact with each other. As a result, the resistance of the sensor layer decreases, and a current flows from the common electrode to the detection electrodes via the sensor layer.
Implementation Method 2
When the application of force is released, the body of the sensor layer returns to its original shape. However, it takes time for the body to return to its original shape.
Data Source
AI summary
According to an aspect, a detection device includes a first substrate having a first surface, a sensor layer facing the first surface, and spacers forming a gap between the first surface and the sensor layer. The first substrate is provided with a detection electrode, a common electrode, a transistor, a gate line coupled to a gate electrode of the transistor, a signal line coupled to a source electrode or a drain electrode of the transistor, a reference potential line, and first and second contact holes. Part of the detection electrode is disposed in the first contact hole and serves as a first contact portion coupled to the other of the source and drain electrodes. Part of the common electrode is disposed in the second contact hole and serves as a second contact portion coupled to the reference potential line. The spacers are formed on the first and second contact portions.