Multifunction Fingerprint Sensor with Live Finger Detection
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Solution Overview
Problem
Fingerprint recognition technologies are vulnerable to unauthorized access as stolen fingerprint patterns can be replicated, making them unreliable for secure device access.
Innovation Solution
A multifunction fingerprint sensor device that combines fingerprint detection with additional biometric data analysis, such as heartbeat or heart rate sensing, and blood cell movement sensing to differentiate between a live person's fingerprint and a copied one, enhancing security by verifying the liveliness of the fingerprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fingerprint sensing is used, then device access can be unlocked, but security is compromised due to vulnerability to replicated fingerprint patterns
Solution Approach 1:
The patent combines multiple sensing functions into a single integrated sensor device. The fingerprint sensor and live finger detection sensor are merged into one device, allowing simultaneous acquisition of fingerprint pattern data and physiological liveliness data. This integration resolves the contradiction by improving authentication reliability through multi-parameter verification while managing device complexity through unified sensor architecture.
Solution Approach 2:
The sensor device performs multiple functions: fingerprint pattern recognition and live finger detection. By making the sensor universal and multi-functional, the system can verify both the identity (through fingerprint pattern) and the liveliness (through physiological signals) of the user, thereby improving authentication reliability without requiring separate dedicated sensors for each function.
2Reliability
If additional biometric sensing is added to detect live finger, then security is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the fingerprint sensing function and live finger detection function into a single integrated sensor device. This combination improves security reliability by enabling simultaneous verification of fingerprint pattern and physiological liveliness, while managing system complexity through unified hardware architecture and integrated signal processing.
Solution Approach 2:
The sensor device is designed with universal multi-functionality, capable of performing both fingerprint recognition and live finger detection. This multi-functional design enhances security reliability through comprehensive biometric verification while avoiding the need for separate dedicated sensors, thereby controlling overall system complexity.
3Measurement precision
If optical sensing is used for live finger detection, then authentication accuracy improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic action by using LED light sources that emit light in pulsed or intermittent manner rather than continuous illumination. This periodic lighting approach maintains sufficient measurement precision for detecting physiological signals (blood flow, heartbeat) while significantly reducing energy consumption compared to continuous optical sensing.
Solution Approach 2:
The system changes optical parameters such as wavelength selection and illumination intensity to optimize the balance between measurement precision and energy consumption. By selecting specific wavelengths that maximize physiological signal detection and adjusting illumination levels adaptively, the system achieves accurate liveness detection with minimized energy usage.
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 effectively prevents unauthorized access by ensuring that only a live person's fingerprint can unlock a device, providing a higher level of security and reliability in biometric authentication.
Implementation Method 1
a light detector to detect scattered light that is scattered from the source of the fingerprint responsive to the emitted light
Implementation Method 2
The detected scattered light over a time period includes the information on a material of the source of the detected contact input associated with the fingerprint, the information on the material includes information on blood cells, heartbeat, blood flow induced speckle patterns change, or a Doppler frequency change
Data Source
Figure 1
Figure 2A~2B
Figure 3A
AI summary
In one aspect, a fingerprint sensor device includes sensing circuitry to generate a sensor signal responsive to detecting a contact input associated with a fingerprint. The sensing circuitry includes a fingerprint sensor to detect the contact input and generate a signal indicative of an image of the fingerprint. The sensing circuitry includes a live finger sensor to generate a signal indicative of an identification of the fingerprint as belonging to a live finger. The generated sensor signal includes the signal indicative of the image of the fingerprint and the signal indicative of the identification of the fingerprint as belonging to a live finger. The fingerprint sensor device includes processing circuitry communicatively coupled to the sensing circuitry to process the generated sensor signal to determine whether the contact input associated with the fingerprint belongs to a live finger.