Touch Sensor with Integrated Strain Gauge for Pressure Detection
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Solution Overview
Problem
Existing touch sensors in display devices require additional pressure sensors to detect pressure intensity, which complicates their fabrication and increases thickness, and they struggle with noise interference and temperature resistance variations.
Innovation Solution
Integration of pressure sensors with touch electrodes and strain gauges in a single layer, forming a Wheatstone bridge circuit to detect pressure intensity without additional sensors, and using noise sensing electrodes to offset noise signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional pressure sensors are used to detect pressure intensity, then pressure detection capability is improved, but device complexity and thickness increase
Solution Approach 1:
The patent combines pressure sensing functionality with the existing touch electrode structure by integrating strain gauges into the same layer as the touch electrodes. This merging eliminates the need for separate additional pressure sensors, thereby maintaining pressure detection capability while reducing device complexity and thickness.
Solution Approach 2:
The touch electrode layer is designed to serve multiple functions: it acts as both a touch detection electrode and a pressure sensing element through the integrated strain gauges. This multi-functionality allows the same structural layer to perform both touch location detection and pressure intensity measurement, avoiding the need for additional dedicated pressure sensors.
2Measurement precision
If additional pressure sensors are used to detect pressure intensity, then pressure detection capability is improved, but device thickness increases
Solution Approach 1:
The patent merges the pressure sensing function into the existing touch electrode layer by placing strain gauges in the same layer. This integration eliminates the need for additional thickness-consuming pressure sensor layers, thereby maintaining pressure detection capability while minimizing increase in overall sensor thickness.
3Ease of manufacture
If strain gauges are integrated in the same layer as touch electrodes, then fabrication is simplified, but noise interference from display panel increases
Solution Approach 1:
The patent incorporates noise sensing electrodes that specifically detect noise signals from the display panel. By detecting and measuring the noise, the system can then compensate for or filter out this interference, converting the harmful noise into useful information that enables noise cancellation and improves overall signal quality.
4Ease of manufacture
If strain gauges are integrated in the same layer as touch electrodes, then fabrication is simplified, but temperature resistance variations affect detection accuracy
Solution Approach 1:
The patent incorporates temperature sensing capability into the integrated structure and uses the detected temperature information to compensate for resistance variations in the strain gauges. This feedback mechanism allows the system to adjust measurements based on temperature conditions, maintaining detection accuracy despite temperature fluctuations.
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
Simplifies the fabrication of touch sensors, reduces thickness, improves touch sensitivity by compensating for temperature variations, and enhances the detection of touch pressure intensity while minimizing noise interference.
Implementation Method 1
a first pressure sensor disposed on the base layer and including a first strain gauge
Implementation Method 2
forming a Wheatstone bridge circuit to detect pressure intensity
Data Source
AI summary
A touch sensor includes first touch electrode members disposed on a base layer and located in a sensing area, each of the first touch electrode members including a plurality of first touch electrodes arranged along a first direction, each of the first touch electrodes including a first opening; second touch electrode members disposed on the base layer and located in a sensing area, each of the second touch electrode members including second touch electrodes arranged along a second direction, each of the second touch electrodes including a second opening; and a first pressure sensor disposed on the base layer and including a first strain gauge. A portion of the first strain gauge is located in the second sensing area, and the first strain gauge includes a portion located in the second sensing area and disposed in the same layer as the first touch electrodes and the second touch electrodes.