Biometric Sensor Electrode Configuration for Foldable Displays
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Solution Overview
Problem
Existing biometric sensors in display devices face challenges in accurately detecting biometric information due to complex structures and high manufacturing costs, which hinder their integration into flexible and foldable display panels.
Innovation Solution
A biometric information sensor is designed with first and second sensor electrodes disposed on the same layer, separated by a piezoelectric layer, allowing for ultrasonic wave generation and detection, and integrated into a display device structure that simplifies manufacturing and reduces thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex sensor structures are used to improve biometric detection accuracy, then measurement precision is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The sensor is divided into multiple finger-shaped sensor electrodes arranged in an array, with each electrode serving as an independent detection unit. This segmentation allows the system to achieve high measurement precision across the entire fingerprint surface while maintaining a relatively simple individual electrode structure, thereby resolving the contradiction between detection accuracy and structural complexity.
Solution Approach 2:
Multiple sensor electrodes are integrated into a single sensor array structure that functions as a unified biometric detection system. The electrodes are arranged to collectively capture fingerprint information, merging individual simple electrode structures into a complex detection system that achieves high measurement precision without requiring each component to be overly complex.
2Measurement precision
If complex sensor structures are used to improve biometric detection accuracy, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The fingerprint sensor is segmented into multiple identical or similar finger-shaped electrode units that can be manufactured using standardized processes. This segmentation enables mass production techniques to be applied, reducing manufacturing cost while maintaining high detection accuracy through the collective functionality of multiple electrodes.
Solution Approach 2:
The sensor electrodes are designed with finger-shaped geometries that match the natural ridges of fingerprints, optimizing the detection parameters for biometric identification. This parameter optimization achieves high measurement precision while using simple conductive materials and standard fabrication techniques, thereby controlling manufacturing costs.
3Ease of manufacture
If traditional sensor integration methods are used in display devices, then manufacturing processes are established, but the sensors cannot be integrated into flexible and foldable display panels
Solution Approach 1:
The sensor electrodes are constructed as thin-film structures that can be deposited on flexible substrates, enabling the sensor array to be integrated into flexible and foldable display panels. This thin-film construction maintains compatibility with established manufacturing processes while providing the flexibility needed for next-generation display devices.
Solution Approach 2:
The sensor array design is made universal by creating a structure that can function in both rigid and flexible display configurations. The finger-shaped electrode pattern and array architecture can be adapted to various display form factors, including flexible and foldable devices, thereby achieving versatility while maintaining ease of manufacture through standardized production techniques.
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
This configuration enhances the accuracy of biometric information detection while reducing manufacturing costs and enabling the integration of biometric sensors into flexible and foldable display devices.
Implementation Method 1
a piezoelectric layer being disposed between the first sensor electrode and the second sensor electrode
Implementation Method 2
charge transfer may occur between the first sensor electrode and the second sensor electrode along a first direction parallel to an upper surface of the first substrate when a pressure is applied in a second direction orthogonal to the upper surface of the first substrate
Data Source
AI summary
A biometric information sensor includes a first substrate and a first sensor electrode disposed on the first substrate. A second sensor electrode is disposed on the first substrate at a same distance from the first substrate as the first sensor electrode. The second sensor electrode is spaced apart from the first sensor electrode. A piezoelectric layer is disposed between the first sensor electrode and the second sensor electrode. A second substrate is disposed on the first sensor electrode, the second sensor electrode, and the piezoelectric layer.