Pressure Sensor Segmentation for Resistance Range and Restorability
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Solution Overview
Problem
Pressure sensors in display devices face issues with wide resistance ranges and slow recovery to initial resistance after prolonged pressure application, affecting their reliability and manufacturing costs.
Innovation Solution
The pressure sensor design includes spacers between driving and sensing electrodes, forming gaps with pressure sensing layers, and using a coupling layer to improve restorability, with each sensing cell having varying resistances to reduce detected resistance ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pressure sensor is used to detect a wide range of resistance values (20 kΩ to 100 kΩ), then the sensor can accommodate various pressing forces, but the sensor fails to restore to its initial resistance after prolonged pressure application
Solution Approach 1:
The pressure sensor is divided into multiple sensing cells (first sensing cell and second sensing cell), each detecting different resistance ranges. The first sensing cell detects 20 kΩ to 100 kΩ while the second detects 100 kΩ to 500 kΩ, allowing the system to handle a wider overall range while maintaining reliability through specialized segmentation of detection responsibilities
Solution Approach 2:
The patent introduces a restorability parameter that changes the physical or chemical state of the pressure sensing material to improve its ability to return to initial resistance after prolonged pressure, thereby resolving the contradiction between wide detection range and restoration capability
2Device complexity
If the pressure sensing layer is in direct contact with driving and sensing electrodes, then the sensor structure is simple, but the detected resistance range becomes excessively wide and restorability deteriorates
Solution Approach 1:
A coupling layer is introduced as an intermediary between the pressure sensing layer and the driving/sensing electrodes. This coupling layer has specific mechanical and electrical properties that enable the pressure sensing layer to restore to its initial state after pressure application, while still allowing effective signal transmission, thus improving restorability without significantly increasing structural complexity
3Ease of operation
If the pressure sensing layer contacts both driving and sensing electrodes simultaneously, then resistance detection is straightforward, but the range of detected resistances becomes too wide affecting precision
Solution Approach 1:
The pressure sensor is segmented into multiple sensing cells, each responsible for detecting specific resistance ranges. The first sensing cell detects 20 kΩ to 100 kΩ and the second detects 100 kΩ to 500 kΩ, allowing the system to maintain ease of operation while improving measurement precision through specialized detection zones
Solution Approach 2:
Different regions of the pressure sensor are designed with different local qualities - each sensing cell has optimized electrode configurations and pressure sensing layer properties suited to its specific detection range, enabling precise measurement across the overall wide range without compromising local measurement accuracy
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 enhances the restorability of pressure sensors to their initial resistance, reduces the range of resistances detected, and lowers manufacturing costs by optimizing the pressure sensing unit's performance.
Implementation Method 1
The resistance detected by a pressure sensor may vary depending on the force that the user presses the pressure sensor with
Data Source
AI summary
A pressure sensor includes: first and second substrates; a first driving electrode and a first sensing electrode disposed on a first surface of the first substrate that faces the second substrate; a spacer disposed on the first surface of the first substrate between the first driving electrode and the first sensing electrode; and a first pressure sensing layer disposed on a first surface of the second substrate that faces the first substrate and overlapping with the first driving electrode and the first sensing electrode in a thickness direction.