Multi-Sided Fingerprint Sensor Array for Energy-Efficient Scanning
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Solution Overview
Problem
Existing fingerprint imaging methods are energy inefficient and require time-consuming calibration to provide accurate fingerprint information.
Innovation Solution
A multi-sided fingerprint scanning device using a multiple charge-coupled biometric sensor array with a set of imaging pixel electrodes, where a voltage source applies alternating voltages to measure resistance and charged skin voltage differences, providing accurate fingerprint data without extensive calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional fingerprint imaging methods are used, then fingerprint information can be obtained, but energy consumption is high and calibration is time-consuming
Solution Approach 1:
The patent applies periodic action by using alternating voltage cycles (first voltage then second voltage) to the sensor electrodes. This periodic voltage application enables the system to capture different electrical measurements (live fingerprint vs. non-live) in successive cycles, eliminating the need for separate calibration steps while reducing energy consumption compared to continuous high-power operation
Solution Approach 2:
The patent changes electrical parameters (voltage levels, measurement timing) to differentiate between live and non-live fingerprint states. By varying voltage parameters and measuring at specific moments in the voltage cycle, the system achieves accurate fingerprint detection without requiring time-consuming calibration procedures
2Measurement precision
If conventional fingerprint imaging methods are used, then fingerprint information can be obtained, but the system requires time-consuming calibration to provide accurate information
Solution Approach 1:
The patent achieves continuous useful action by integrating both calibration and measurement functions into a single operational flow. The alternating voltage measurements continuously provide both calibration data (non-live fingerprint) and detection data (live fingerprint) without interruption, eliminating separate calibration steps and maintaining measurement precision throughout operation
Solution Approach 2:
The system performs self-calibration by automatically comparing measurements from different voltage states. The controller autonomously determines which measurements represent live vs. non-live fingerprints and adjusts accordingly, eliminating the need for manual calibration procedures while maintaining accurate fingerprint information
3Measurement precision
If multiple voltage measurements are taken, then accurate fingerprint information is obtained, but energy consumption increases
Solution Approach 1:
The patent uses periodic voltage application with alternating between first and second voltages, where measurements are taken at specific phases of this periodic cycle. This approach obtains accurate fingerprint information through multiple measurements while managing energy consumption by using lower power during non-measurement phases and leveraging the natural periodic operation of the sensor
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 energy-efficient and accurate fingerprint scanning, reducing the need for calibration and enhancing security through precise fingerprint recognition.
Implementation Method 1
a voltage source applies alternating voltages to measure resistance and charged skin voltage differences
Implementation Method 2
a meter takes a first electrical measurement (e.g., resistance and/or charged skin voltage) of the plurality of electrodes
Data Source
AI summary
Embodiments of the present invention relate to fingerprint scanning. Specifically, the present invention relates to a multi-sided fingerprint scanning device on a card (e.g., credit card, smart card, etc.), an associated energy-efficient method for attaining accurate fingerprint information using a multiple charge-coupled biometric sensor array. In a typical embodiment, a scanning device will be provided that includes a scanning area comprised of a set (e.g., at least one) of imaging pixel electrodes (e.g., arranged adjacent to one another in a grid-like or other fashion). As a user presses his/her finger against the scanning area, a portion of the finger will contact a plurality of electrodes. When this occurs, a voltage source of the device will apply a first voltage to each of the plurality of electrodes. A meter of the device will take a first electrical measurement (e.g., resistance and/or charged skin voltage) of the plurality of electrodes. The voltage source of the device will apply a second voltage to the plurality of electrodes. The meter of the device will take a second electrical measurement (e.g., resistance and/or charged skin voltage) of the plurality of electrodes. The voltage level difference between the first electrical measurement and second electrical measurement is calculated. The voltage level difference provides accurate fingerprint information.