Piezoelectric Sensor With Variable Thickness For Biometric Detection
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing biometric information and providing high-security application functions due to limitations in sensing accuracy and security, particularly in terms of size reduction and increased sensing area, with current sensing devices being inadequate in these aspects.
Innovation Solution
A piezoelectric sensor with a flexible structure, featuring a lower substrate, sensing transistors, a piezoelectric material layer, and an upper electrode, where the piezoelectric material layer has varying thicknesses in different areas, allowing for the generation of ultrasonic waves of varying wavelengths, enabling more accurate and fine detection of biometric information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sensing devices are used, then the device structure is simple, but the sensing accuracy and security are insufficient
Solution Approach 1:
The piezoelectric material layer is designed with different thicknesses in different regions: a first thickness in sensing transistor areas and a greater second thickness in non-sensing transistor areas. This local variation enables different ultrasonic wave wavelengths to be generated in different regions, improving biometric information detection accuracy without requiring complete redesign of the entire device structure.
Solution Approach 2:
The piezoelectric sensor is designed to be stretchable and flexible, allowing the sensing area to dynamically adjust. The device can be stretched to expand the sensing area or contracted to reduce size, providing dynamic adaptability while maintaining sensing performance through the piezoelectric material's ability to generate ultrasonic waves across varying geometries.
2Volume of moving object
If the sensing device size is decreased, then the device becomes more compact, but the sensing area is reduced
Solution Approach 1:
The piezoelectric sensor utilizes stretchable substrates and flexible piezoelectric material layers that allow the device to be dynamically stretched to expand the sensing area or contracted to reduce overall device size. This dynamic capability enables the same sensing device to adapt to different size requirements without permanently sacrificing sensing area.
Solution Approach 2:
The sensor employs flexible piezoelectric material layers and stretchable substrates that can be deformed without damage. These flexible components allow the sensing device to change its physical dimensions while maintaining functional integrity, enabling compact storage when contracted and expanded sensing area when stretched.
3Manufacturing precision
If the piezoelectric material layer has uniform thickness, then the manufacturing process is simple, but the ultrasonic wave wavelength control is limited
Solution Approach 1:
The piezoelectric material layer is manufactured with spatially varying thickness: a first thickness region corresponding to sensing transistor locations and a second thickness region with greater thickness in non-transistor areas. This local thickness variation enables different ultrasonic wave wavelengths to be generated in different regions, improving biometric detection capability while using standard thin-film deposition techniques that can accommodate thickness variations.
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 piezoelectric sensor enhances biometric information detection accuracy and security by generating ultrasonic waves of different wavelengths, allowing for the detection of various types of biometric data, thereby improving the performance of application functions and providing a stretchable, flexible display device.
Implementation Method 1
a piezoelectric element including a piezoelectric material layer 340 disposed between the two electrodes 350, 330
Data Source
AI summary
A piezoelectric sensor includes: a lower substrate; a plurality of sensing transistors that are disposed on the lower substrate; a lower electrode that is disposed to cover the plurality of sensing transistors; a piezoelectric material layer that is disposed on the lower electrode; and an upper electrode that is disposed on the piezoelectric material layer. The piezoelectric material layer has a first thickness in a plurality of first areas in which the plurality of sensing transistors are disposed and has a second thickness which is greater than the first thickness in a second area in which the plurality of sensing transistors are not disposed. Accordingly, it is possible to further accurately and finely detect various types of biometric information.