Elastic Layer Thickness Modulation for Pressure Sensing
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Solution Overview
Problem
Current touch display devices face challenges in accurately detecting pressure and position due to limitations in sensor technology, particularly in converting pressure changes into reliable output signals.
Innovation Solution
A pressure sensor is designed with an elastic layer between the gate electrode and active layer of a thin film transistor, which decreases in thickness upon pressure application, allowing for the conversion of pressure signals into output signals, enabling the determination of touch pressure and position through signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional conductive thin film patterning is used to form touch sensors, then the manufacturing process is simple, but the pressure detection accuracy and sensitivity are insufficient
Solution Approach 1:
The patent utilizes the elastic layer's thickness parameter change in response to pressure. When pressure is applied, the elastic layer compresses and its thickness decreases, which directly modulates the capacitance between the gate electrode and the moving electrode. This parameter change mechanism enables accurate pressure detection without complex structural modifications.
Solution Approach 2:
The elastic layer serves as an intermediary element between the applied pressure and the electrical signal generation. It converts mechanical pressure into physical displacement, which then translates into electrical signal changes through the capacitance modulation mechanism. This intermediary approach simplifies the overall sensor structure while maintaining high detection accuracy.
2Measurement precision
If the elastic layer thickness is reduced to increase pressure sensitivity, then the pressure detection sensitivity improves, but the structural stability and reliability decrease
Solution Approach 1:
The patent employs a thin elastic layer that is both flexible and structurally sound. The elastic layer is designed with appropriate thickness and material properties to provide the necessary flexibility for pressure response while maintaining structural integrity. This thin film approach enables high pressure sensitivity without compromising reliability.
Solution Approach 2:
The sensor structure uses composite material design, combining the elastic layer with conductive thin films and insulating layers. This composite structure allows the elastic layer to be optimized for flexibility and pressure response, while the surrounding materials provide structural support and electrical functionality, thereby maintaining reliability.
3Measurement precision
If the elastic layer is made thinner to improve position detection accuracy, then the position measurement precision improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the elastic layer's thickness parameter as the key sensing mechanism. By carefully controlling the elastic layer's initial thickness within a specific range (e.g., 1-10 micrometers), the design achieves high position detection accuracy. The parameter change approach allows for precise detection while maintaining manufacturability through standard thin film deposition techniques.
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 effectively enhances the sensitivity and accuracy of touch pressure and position detection by reliably converting pressure changes into measurable output signals, improving the performance of touch display devices.
Implementation Method 1
an elastic layer, which is arranged between the active layer and the gate electrode in a direction perpendicular to the active layer, wherein, in a case that a pressure is applied to the pressure sensor, a thickness of the elastic layer is decreased
Data Source
AI summary
A pressure sensor, a touch substrate and a touch display device are provided. The pressure sensor includes: an active layer; a gate electrode, which is stacked with the active layer and insulated from the active layer; an elastic layer, which is arranged between the active layer and the gate electrode in a direction perpendicular to the active layer, and a thickness of the elastic layer is decreased in a case that a pressure is applied to the pressure sensor; and a source electrode and a drain electrode, which are spaced from each other and are both electrically connected with the active layer.