Touch Screen Strain Sensor Continuous Pressure Detection
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Solution Overview
Problem
Conventional pressure-sensitive touch screens can only detect changes in pressure on their surface and cannot continuously measure the amount of pressure applied, limiting their application and development.
Innovation Solution
A touch screen design incorporating a first and second strain sensor in specific regions, connected to a power supply and voltage detector, which detects compressive and stretching deformations to quantify pressure applied, allowing continuous pressure measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a piezoelectric material is used for pressure-sensitive touch screen, then the touch screen can detect pressure changes, but it cannot continuously detect the amount of pressure applied
Solution Approach 1:
The touch screen is divided into multiple detection regions (first region surrounded by second region) with different strain sensor configurations. The first strain sensor detects compressive deformation in the inner region while the second strain sensor detects stretching deformation in the outer region, enabling continuous pressure amount detection through segmented measurement zones.
Solution Approach 2:
The patent changes the detection parameter from simple pressure change detection to continuous pressure amount detection by using strain sensors that measure deformation magnitude. The voltage detector measures voltage changes proportional to the amount of pressure applied, allowing quantitative pressure measurement rather than just change detection.
2Reliability
If conventional pressure-sensitive touch screen is used, then it can detect pressure change, but the development and application are limited
Solution Approach 1:
The touch screen achieves multi-functionality by combining pressure-sensitive detection with continuous pressure amount detection capabilities. The system can perform both binary pressure detection (pressured/not pressed) and quantitative pressure measurement, expanding its applicability to various scenarios requiring different levels of pressure sensitivity.
Solution Approach 2:
The patent replaces the conventional piezoelectric material-based mechanical detection system with a strain sensor system that uses electrical resistance changes to detect deformation. This substitution enables more precise and continuous measurement capabilities while maintaining the pressure-sensitive function.
3Measurement precision
If strain sensors are arranged in specific regions with different deformation characteristics, then continuous pressure detection is enabled, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple strain sensors into a unified detection system where the first and second strain sensors work together with a common voltage detector. The sensors are electrically connected in a configuration that allows simultaneous measurement of compressive and stretching deformations, combining multiple measurement functions into an integrated system.
Solution Approach 2:
The voltage detector serves as an intermediary that converts the resistance changes from both strain sensors into measurable voltage signals. This intermediary component simplifies the overall system by providing a single measurement interface that reflects the combined deformation state of both sensor regions.
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
Enables continuous detection of pressure, expanding the application range and promoting development of pressure-sensitive touch screens beyond mere change detection.
Implementation Method 1
a first strain sensor located in a first region, a second strain sensor located in a second region... in a case that pressure is applied onto the surface of the touch screen, compressive deformation is formed in a region close to a location of the touch screen under the pressure since the region close to the location is sunk downwardly, and stretching deformation is formed in a region away from the location of the touch screen wider the pressure
Implementation Method 2
a piezoelectric pressure-sensitive principle is used for the pressure-sensitive touch screen... the pressure-sensitive touch screen is made of a piezoelectric material. Since a resistance of the piezoelectric material will be changed in a case that pressure is applied onto the piezoelectric material
Data Source
AI summary
A touch screen is provided. The touch screen includes a first strain sensor located in a first region, a second strain sensor located in a second region, a first power supply and a first voltage detector. The first region is surrounded by the second region, the first power supply is configured to provide an operating voltage to the first strain sensor and the second strain sensor. The first voltage detector is configured to detect a voltage of a common terminal of the first strain sensor and the second strain sensor, and one terminal of the first voltage detector is connected to a first preset voltage, and the other terminal of the first voltage detector is electrically connected to the common terminal of the first strain sensor and the second strain sensor.