Two-Terminal Stretchable Touch Array Sensors for Dynamic Movement Detection
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Solution Overview
Problem
Existing pressure sensors require complex calibration due to contact resistance and parasitic resistance, necessitate numerous terminals for integration, and struggle with large-scale integration and real-time detection of dynamic movements.
Innovation Solution
A two-terminal stretchable touch array sensor with mirror-symmetrical upper and lower electrodes, embedded in elastic substrates, and a spacer, utilizing metal flakes and conductive liquid metal microparticles for resistance-based touch detection, allowing for real-time dynamic movement analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of sensor pixels are used to increase spatial resolution, then measurement precision is improved, but device complexity and data collection time increase
Solution Approach 1:
The sensor array is divided into multiple sensor pixels arranged in a matrix pattern, where each pixel independently detects touch pressure. This segmentation allows high spatial resolution through multiple detection points while using a standardized repeating structure that simplifies overall device design and manufacturing.
Solution Approach 2:
Each sensor pixel in the matrix uses the same structural design and material composition, making every pixel a universal detection unit. This universality allows the system to achieve high spatial resolution through replication rather than through increasingly complex individual sensor designs, reducing overall device complexity.
2Measurement precision
If more sensor pixels are integrated to recognize dynamic movement, then measurement precision is improved, but productivity and real-time response are deteriorated
Solution Approach 1:
The sensor is segmented into multiple independent pixels that simultaneously detect touch events across different locations. This parallel segmentation enables the system to track dynamic movement across the entire sensor surface at once, improving real-time response while maintaining high measurement precision through multiple concurrent detection points.
Solution Approach 2:
The sensor pixels continuously monitor touch pressure and generate real-time resistance change signals. This continuous detection capability allows the system to track dynamic movement without interruption, maintaining both high measurement precision and fast response time through uninterrupted data collection from all pixels simultaneously.
3Ease of manufacture
If traditional pressure sensors are used, then manufacturing is simpler, but reliability is reduced due to contact resistance and parasitic resistance
Solution Approach 1:
The patent changes the electrical parameters of the sensor by using conductive liquid metal microparticles instead of traditional conductive materials. This parameter change eliminates contact resistance and parasitic resistance issues while maintaining ease of manufacture through a solution-based fabrication process that can be applied using standard coating techniques.
Solution Approach 2:
The sensor uses a composite material system combining liquid metal microparticles suspended in a polymer matrix. This composite structure provides both mechanical flexibility and excellent electrical conductivity, improving reliability by eliminating contact resistance while the solution-based processing maintains ease of manufacture.
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
The sensor easily recognizes touch positions and dynamic movements with high spatial resolution and real-time response, maintaining conductivity during stretching and bending.
Implementation Method 1
The second electrode patterns of the upper electrode pattern and the lower electrode pattern may each independently include conductive liquid metal microparticles (LMMPs)
Implementation Method 2
an upper electrode including an upper electrode pattern embedded in a first elastic substrate, a lower electrode including a lower electrode pattern embedded in a second elastic substrate
Data Source
AI summary
Provided are a two-terminal stretchable touch array sensor and a method of preparing the two-terminal stretchable touch array sensor, and the two-terminal stretchable touch array sensor includes an upper electrode including an upper electrode pattern embedded in a first elastic substrate, a lower electrode including a lower electrode pattern embedded in a second elastic substrate, a spacer interposed between the upper electrode and the lower electrode, and a first terminal and a second terminal each included at the same position of an end of the upper electrode pattern and an end of the lower electrode pattern.