Capacitive Pressure Detection in Display Panels via Metal Layer
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Solution Overview
Problem
Existing methods for detecting pressure values in three-dimensional touch technologies are complex and require specialized pressure sensors.
Innovation Solution
A display panel design featuring a metal layer, a substrate, a separation layer, and a cathode layer, where a capacitance is formed between the cathode and metal layers, allowing pressure detection by measuring changes in capacitance when the panel is pressed, with a control unit connected to both layers to calculate the applied force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a special pressure sensor is used for pressure detection, then the pressure detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The metal layer serves dual functions: as an electrode for display operation and as a pressure sensing element. By making the metal layer electrically connected to the substrate and forming a capacitance with the cathode layer, it enables pressure detection without requiring separate pressure sensor components, thus reducing device complexity while maintaining detection capability
Solution Approach 2:
The display panel's own structural components (metal layer, cathode layer, substrate, separation layer) are utilized for pressure detection. The capacitance change between existing layers is measured to detect pressure, allowing the display panel to perform both display and pressure sensing functions using its inherent structure, eliminating the need for additional specialized sensors
2Measurement precision
If a special pressure sensor is used for pressure detection, then the pressure detection capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The metal layer is designed to serve multiple purposes: it acts as an electrode for the display function and simultaneously as a pressure sensing element. This eliminates the need for separate pressure sensor manufacturing processes, integration steps, and additional material deposition, thereby simplifying manufacturing while maintaining pressure detection capability
Solution Approach 2:
The pressure detection function is merged into the existing display panel structure by utilizing the capacitance between the cathode layer and metal layer. This integration eliminates the need for separate pressure sensor manufacturing, reducing the number of manufacturing steps, materials required, and process 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
This design simplifies pressure detection by utilizing capacitance changes between the cathode and metal layers, reducing the complexity of pressure detection and enabling accurate force measurement.
Implementation Method 1
a capacitance is formed between the cathode layer and the metal layer; and, when the display panel is pressed, the capacitance between the cathode layer and the metal layer changes
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a metal layer, a substrate, a separation layer and a cathode layer, wherein the substrate is disposed on the metal layer; the separation layer is disposed on the substrate, and both the separation layer and the substrate are used for insulating the metal layer and the cathode layer from each other; the cathode layer is disposed on the separation layer, and a capacitance is formed between the cathode and the metal layer; and, when the display panel is pressed, the capacitance between the cathode and the metal layer changes.