Transparent Resistive Pressure Sensor with Oriented Nanowires
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Solution Overview
Problem
Conductive pressure-sensitive composites lack precision in measuring local pressure and are limited by their non-optical transparency and durability, making them unsuitable for applications in visual display products.
Innovation Solution
A resistive pressure sensor with a flexible substrate, an elastic dielectric layer, and a pressure-sensitive composite layer comprising conductive one-dimensional nanomaterials oriented perpendicular to the surface, which allows for precise pressure measurement and high optical transparency, achieved through a method involving a transparent polymer dielectric matrix and in-situ polymerization of conductive nanowires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductive particles are embedded in an elastic polymer medium to create a pressure-sensitive composite, then the composite can detect pressure through resistance change, but the measurement precision of local pressure is poor and large force is required for proper function
Solution Approach 1:
The patent divides the pressure sensing function into discrete pressure-sensitive elements arranged in an array. Each element independently responds to local pressure, enabling precise spatial resolution of pressure distribution without requiring large overall forces. The segmentation allows localized deformation detection at each element position.
Solution Approach 2:
The patent creates regions with different mechanical and electrical properties within the composite material. By varying the concentration and distribution of conductive particles or using layered structures, the material exhibits enhanced local pressure sensitivity in specific zones while maintaining overall structural integrity, allowing precise local pressure measurement with minimal force.
2Reliability
If high concentration of conductive particles is used in the pressure-sensitive composite to improve durability, then long-term durability under repeated deformation is enhanced, but optical transparency is reduced
Solution Approach 1:
The patent employs composite material structures combining transparent polymer matrices with conductive particle networks. By optimizing the composite formulation, phase distribution, and particle morphology, the material achieves both high optical transparency and improved durability. The composite structure allows conductive particles to form durable networks while minimizing light scattering and absorption.
Solution Approach 2:
The patent modifies key parameters of the pressure-sensitive composite including particle size, particle concentration, polymer matrix properties, and curing conditions. By adjusting these parameters, the material achieves optimal balance between durability and optical transparency, enabling use in applications requiring both robustness and visual clarity.
3Adaptability or versatility
If the pressure-sensitive composite is designed to be optically transparent for visual display products, then application suitability is improved, but the concentration of conductive particles must be reduced which affects durability
Solution Approach 1:
The patent develops transparent composite materials with optimized conductive particle networks that maintain durability even at reduced concentrations. The composite structure, polymer matrix selection, and particle arrangement are designed to maximize both transparency and mechanical robustness, enabling reliable performance in visual display applications.
Solution Approach 2:
The patent transitions from two-dimensional particle networks to three-dimensional conductive structures or vertically oriented particle arrangements. This dimensional change enhances electrical connectivity and mechanical durability while maintaining optical transparency, as the conductive pathways extend through the thickness direction rather than relying on dense in-plane particle concentration.
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 solution enables accurate local pressure measurement with improved durability and optical transparency, enhancing the sensor's sensitivity and suitability for use in visual display devices.
Implementation Method 1
the pressure-sensitive composite layer comprises a conductive one-dimensional nanomaterial oriented substantially perpendicular to the first surface
Implementation Method 2
an elastic dielectric layer with porous structure
Data Source
AI summary
A transparent resistive pressure sensor and method of making the same are disclosed. The transparent resistive pressure sensor may include a flexible pressure substrate, a pressure electrode layer, an elastic dielectric spacer with microstructure, a transparent pressure-sensitive composite layer composed of a transparent polymer dielectric matrix and a conductive one-dimensional nanomaterial oriented substantially in a thickness direction of the transparent pressure-sensitive composite layer, a support electrode layer, and a support substrate.