Flexible Pressure Sensor Using Composite Gate Insulating Layer
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Solution Overview
Problem
Existing pressure sensors face challenges in achieving flexibility and excellent piezoelectric characteristics, as organic materials lack piezoelectric properties when processed at low temperatures, while inorganic materials require high-temperature processes, making them unsuitable for flexible substrates.
Innovation Solution
A pressure sensor integrated with thin film transistors (TFTs) on a flexible substrate, featuring a gate insulating layer with dispersed piezoelectric inorganic nanoparticles and an organic matrix, which allows for low-temperature processing and enhanced piezoelectric performance, utilizing an alternating current signal to sense pressure through remnant polarization values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inorganic materials are used for pressure sensors, then piezoelectric characteristics are improved, but manufacturing temperature increases making them unsuitable for flexible substrates
Solution Approach 1:
The patent uses a composite material consisting of inorganic piezoelectric nanoparticles dispersed in an organic polymer matrix. This composite structure combines the advantages of both materials: the inorganic nanoparticles provide excellent piezoelectric characteristics while the organic matrix enables low-temperature processing and flexibility. The composite gate insulating layer achieves both high measurement precision and low manufacturing temperature compatibility.
Solution Approach 2:
The patent changes the physical and chemical parameters of the gate insulating layer by incorporating piezoelectric nanoparticles with specific properties (size, composition, concentration) into the organic matrix. This parameter modification allows the material to exhibit enhanced piezoelectric characteristics while maintaining processability at low temperatures suitable for flexible substrate manufacturing.
2Temperature
If organic materials are used for pressure sensors, then low-temperature processing is achieved, but piezoelectric characteristics deteriorate
Solution Approach 1:
The organic polymer matrix is combined with inorganic piezoelectric nanoparticles to create a composite material that overcomes the limitations of pure organic materials. The organic matrix provides low-temperature processability while the dispersed inorganic nanoparticles contribute excellent piezoelectric characteristics, achieving both low processing temperature and high measurement precision.
Solution Approach 2:
The patent modifies the properties of the organic gate insulating layer by incorporating piezoelectric nanoparticles, changing its electrical and mechanical parameters. This enhancement transforms the organic material from having poor piezoelectric characteristics to exhibiting excellent piezoelectric response while maintaining low-temperature processing capability.
3Adaptability or versatility
If flexible substrates are used, then adaptability is improved, but manufacturing complexity increases due to temperature constraints
Solution Approach 1:
The composite gate insulating layer with piezoelectric nanoparticles in an organic matrix enables simultaneous achievement of flexibility and simplified manufacturing. The organic matrix provides flexibility and low-temperature processability, eliminating the need for complex high-temperature processing steps required for traditional inorganic materials on flexible substrates.
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 the creation of flexible pressure sensors with improved piezoelectric characteristics, allowing for accurate pressure sensing on flexible substrates while maintaining low-temperature processing, thus addressing the limitations of both organic and inorganic materials.
Implementation Method 1
the gate insulating layer comprises an organic matrix in which piezoelectric inorganic nano-particles are dispersed
Implementation Method 2
obtain a remnant polarization value based on a drain current which is generated in response to the AC signal and detected by the sensor TFT, and to sense pressure based on the remnant polarization value
Data Source
AI summary
A pressure sensor and a pressure sensing method are provided. The pressure sensor includes a substrate; a sensor thin film transistor (TFT) disposed on the substrate and including a gate insulating layer, wherein the gate insulating layer includes an organic matrix in which piezoelectric inorganic nano-particles are dispersed; a power unit configured to apply an alternating current (AC) signal to a gate of the sensor TFT; and a pressure sensing unit configured to obtain a remnant polarization value based on a drain current which is generated in response to the AC signal and detected by the sensor TFT, and to sense a pressure based on the remnant polarization value.