Omni-Directional Piezoelectric Sensor with Segmented Modules
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Solution Overview
Problem
Conventional piezoelectric sensors are limited to unidirectional pressure sensing and cannot achieve omni-directional pressure sensing due to their rigid structure and manufacturing processes.
Innovation Solution
A piezoelectric sensor design featuring a first and second functional module connected to a shared carbon nanotube thin film conductive channel layer, with P-type and N-type Thin Film Transistors (TFTs) respectively, allowing for pressure sensing in perpendicular directions, integrated with a silk fibroin substrate for flexibility and biocompatibility, enabling omni-directional pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional piezoelectric sensors use silicon chip manufacturing with high-temperature oven annealing, then rigid piezoelectric sensor components are produced, but the sensors are limited to unidirectional pressure sensing
Solution Approach 1:
The sensor is divided into multiple functional modules (first functional module with P-type TFT, second functional module with N-type TFT), each responsible for sensing pressure in different directions. This segmentation enables multi-directional pressure sensing while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The piezoelectric thin film layer serves multiple functions: it generates electrical signals in response to mechanical stress and works with both P-type and N-type TFTs to enable sensing in multiple directions. The shared electrode layer and piezoelectric layer provide universal functionality across different sensing directions
2Adaptability or versatility
If a single piezoelectric thin film layer is used, then the device structure is simple, but only unidirectional pressure can be sensed
Solution Approach 1:
The sensor is divided into multiple functional modules (first functional module with P-type TFT, second functional module with N-type TFT), each responsible for sensing pressure in different directions. This segmentation enables multi-directional pressure sensing while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The sensor transitions from unidirectional to multi-directional sensing by adding functional modules that respond to pressure in perpendicular directions. The first functional module senses pressure in a first direction while the second functional module senses pressure in a second direction perpendicular to the first, achieving omni-directional pressure detection
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
The sensor effectively senses pressures in multiple directions by utilizing the difference in work functions of metals and carbon nanotubes, allowing for flexible and biocompatible omni-directional pressure sensing, suitable for applications in medical and wearable devices.
Implementation Method 1
The so-called piezoelectric effect refers to that when some dielectric is deformed as an external force is applied in a certain direction, a polarization phenomenon may occur in the dielectric, and at the same time opposite charges, i.e., positive and negative charges, appear in two opposite surfaces of the dielectric.
Implementation Method 2
a first Thin Film Transistor (TFT) having a source connected to a first electrode contact terminal of the second electrode layer, a drain connected to a first data line and a gate connected to a first gate line
Data Source
AI summary
The present disclosure discloses a piezoelectric sensor and a method for manufacturing the same to realize omni-directional pressure sensing. The piezoelectric sensor according to the present disclosure comprises a first electrode layer, a second electrode layer and a piezoelectric thin film layer between the first electrode layer and the second electrode layer, the piezoelectric sensor further comprising: a first functional module and a second functional module, both of which are connected to the second electrode layer, wherein the first functional module is configured to sense a pressure applied to the piezoelectric sensor in a first direction, and the second functional module is configured to sense a pressure applied to the piezoelectric sensor in a second direction, the first direction and the second direction are perpendicular to each other.