Pressure Sensor with Opposite Pyroelectric Nanoparticles

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Solution Overview

Problem

Pressure sensors face challenges in accurately detecting pressure values in environments with temperature and strain changes due to material sensitivity to both factors.

Innovation Solution

A pressure sensor design featuring a base substrate with an embossed pattern, a first conductive layer, a pressure-sensitive material layer with dielectric and nanoparticles having opposite pyroelectricities, and a second conductive layer, which includes a dielectric with positive pyroelectricity and nanoparticles like barium titanate with negative pyroelectricity, allowing for improved sensitivity and reduced temperature influence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If pressure sensor uses materials with both strain and temperature sensitivity, then it can detect pressure in varying environments, but temperature changes cause inaccurate pressure detection

Engineering Contradiction:

Improveenvironmental adaptabilityVSAvoidpressure detection accuracy

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The pressure sensor employs a composite material system consisting of a dielectric material and pyroelectric nanoparticles with opposite pyroelectricity signs. This composite structure allows the material to maintain pressure sensitivity while compensating for temperature effects through the opposing pyroelectric responses, thereby achieving both environmental adaptability and measurement precision

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the pyroelectric parameters of the sensing material by incorporating nanoparticles with opposite pyroelectricity signs. This parameter modification enables the material to respond differently to temperature changes, compensating for temperature-induced measurement errors while maintaining pressure detection capability

Inventive Principle:

Principle #35Parameter changes

2Reliability

If pressure sensor material has high pyroelectricity, then temperature sensitivity increases, but pressure measurement accuracy decreases due to temperature interference

Engineering Contradiction:

Improvetemperature compensationVSAvoidpressure measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies the counterweight principle by using pyroelectric nanoparticles with opposite pyroelectricity signs to the dielectric material. The opposing pyroelectric responses act as counterbalancing forces that cancel out temperature-induced electrical signal changes, allowing the sensor to maintain pressure measurement accuracy in varying temperature conditions

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Ease of manufacture

If pressure sensor uses conventional materials, then manufacturing is simple, but device characteristics and sensitivity are limited

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoiddevice characteristics

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention creates a composite material system that combines dielectric material with pyroelectric nanoparticles. This composite approach enhances device characteristics and sensitivity while maintaining compatibility with conventional manufacturing processes, as the nanoparticles can be incorporated into the dielectric matrix using existing material fabrication techniques

Inventive Principle:

Principle #40Composite materials

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 achieves enhanced pressure sensitivity and stability by minimizing temperature effects, maintaining consistent voltage output regardless of temperature changes and improving flexibility and stress absorption.

Implementation Method 1

a pressure sensitive material layer disposed on the first conductive layer such that its electrical characteristic is varied corresponding to a strain applied thereto

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

the dielectric and the nanoparticle include materials having pyroelectricities of polarities opposite to each other

Methodology Applied

Scientific EffectPyroelectric effect: Pyroelectric Effect

Data Source

PatentUS12111219B2Pressure sensor, manufacturing method thereof, and display device having the same

Publication Date: 2024.10.08 SAMSUNG DISPLAY CO LTD

AI summary

A pressure sensor includes: a base substrate including an embossed pattern; a first conductive layer disposed on the base substrate; a pressure sensitive material layer disposed on the first conductive layer such that its electrical characteristic is varied corresponding to a strain applied thereto, the pressure sensitive material layer including a dielectric and nanoparticles dispersed in the dielectric; and a second conductive layer disposed on the pressure sensitive material layer, wherein the dielectric and the nanoparticle include materials having pyroelectricities of polarities opposite to each other.