Piezoresistive Sensor Isolation on Flexible Substrates
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Solution Overview
Problem
Conventional sensor technologies are not well-suited for bridging the gap between computing devices and the physical world, particularly in applications envisioned by the 'Internet of Things', as they fail to effectively translate physical information into digital form and are prone to errors due to substrate distortion in flexible sensor arrays.
Innovation Solution
The development of piezoresistive sensors integrated with flexible substrates and conductive traces, which include stiffeners and additional compensation traces to resist distortion, and isolation techniques such as apertures and cutouts to maintain sensor accuracy and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional sensor technology is used on flexible substrates, then the sensors can be integrated with wearable devices, but the sensor accuracy deteriorates due to substrate distortion
Solution Approach 1:
The flexible substrate is segmented into isolated sensor regions separated by apertures or cutouts. This segmentation prevents distortion in one region from affecting other sensor regions, maintaining measurement precision while preserving flexible substrate integration
Solution Approach 2:
Stiffener structures are introduced as intermediary elements between the flexible substrate and the sensor traces. These stiffeners act as mediators that reduce substrate distortion at the sensor locations, thereby maintaining sensor accuracy while allowing the overall substrate to remain flexible
2Measurement precision
If stiffeners are added to resist substrate distortion, then sensor accuracy is improved, but device complexity increases
Solution Approach 1:
Stiffeners are applied locally only at specific sensor regions where distortion compensation is needed, rather than making the entire substrate rigid. This localized approach improves sensor accuracy while minimizing the increase in overall device complexity
Solution Approach 2:
The stiffeners are designed as thin film structures or flexible rigid elements that can be integrated into the flexible substrate without significantly increasing bulk complexity. These thin film stiffeners provide the necessary mechanical support while maintaining the overall flexibility and simplicity of the device
3Reliability
If additional compensation traces are integrated, then distortion compensation capability is improved, but manufacturing complexity increases
Solution Approach 1:
The compensation traces are merged with the existing sensor trace pattern during the same manufacturing process. By combining the compensation function with the existing trace structure, the patent achieves distortion compensation capability without significantly increasing manufacturing 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
These sensors provide robust and accurate translation of physical information into digital signals, enabling diverse applications by resisting substrate distortion and maintaining performance under various physical deformations, thus enhancing the usability of flexible sensor arrays in wearable electronics and other IoT applications.
Implementation Method 1
a sensor or sensor system includes a flexible substrate and two or more conductive traces formed directly on or otherwise integrated with the substrate
Data Source
AI summary
Sensors incorporating piezoresistive materials are described. One class of sensors includes conductive traces formed directly on or otherwise integrated with the piezoresistive material.