Fingerprint Sensor Optical Module Live Body Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fingerprint identification apparatuses are vulnerable to spoof fingerprints, compromising the security of mobile terminals as they cannot distinguish between authentic and fake fingerprints.
Innovation Solution
Integration of an optical module with a fingerprint sensor, comprising an optical emitter, optical circuit module, and photoelectric converter, which emits a specific wavelength signal and converts it into an electric signal upon touch, enabling live body detection and reducing the risk of spoof fingerprint cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fingerprint identification apparatuses only compare collected fingerprint information with pre-stored information, then the device complexity is low, but the reliability is insufficient due to vulnerability to spoof fingerprints
Solution Approach 1:
The patent combines the fingerprint sensor with an optical module (including optical emitter, optical circuit module, and photoelectric converter) into an integrated authentication system. This merging allows the device to simultaneously perform fingerprint capture and optical signal detection, enabling live body detection without adding separate independent systems, thus improving reliability while controlling complexity.
Solution Approach 2:
The optical module serves multiple functions: it detects optical signals from live fingers for authentication verification, monitors touch pressure through pressure sensitivity, and can detect physiological parameters such as heart rate and blood oxygen levels. This multi-functionality enhances authentication reliability while avoiding the need for multiple separate sensors.
2Reliability
If an optical module is integrated with the fingerprint sensor to enable live body detection, then the reliability improves by detecting spoof fingerprints, but the device complexity increases
Solution Approach 1:
The optical emitter, optical circuit module, and photoelectric converter are integrated with the fingerprint sensor into a unified structure. The optical circuit module is electrically connected to both the optical emitter and photoelectric converter, creating a compact system that performs multiple detection functions without requiring separate independent modules, thereby managing complexity while enhancing spoof detection capability.
3Measurement precision
If the optical module includes multiple components (optical emitter, optical circuit module, photoelectric converter), then the measurement precision improves for detecting optical signals, but the device complexity increases
Solution Approach 1:
The optical emitter emits optical signals that interact with the finger, the photoelectric converter receives and converts these signals to electrical signals, and the optical circuit module processes these signals. By integrating these components into a coordinated system with the fingerprint sensor, the patent achieves precise optical signal detection for live body verification while maintaining manageable system complexity through unified design.
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
Enhances security by verifying the authenticity of fingerprints and extends functionality to include heart rate detection, touch pressure, key detection, and blood oxygen monitoring, offering a simple, cost-effective, and convenient design.
Implementation Method 1
the optical emitter is configured to emit an optical signal having a specific wavelength
Implementation Method 2
the photoelectric converter is configured to receive the optical signal emitted by the optical emitter and subjected to a touch object, and convert the optical signal into an electric signal
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
A fingerprint identification apparatus and a mobile terminal are disclosed. The fingerprint identification apparatus includes a fingerprint sensor and an optical module electrically connected to the fingerprint sensor. The optical module comprises an optical emitter, an optical circuit module and a photoelectric converter; wherein the optical circuit module is electrically connected to the optical emitter and the photoelectric converter respectively; the optical emitter is configured to emit an optical signal having a specific wavelength; the photoelectric converter is configured to receive the optical signal emitted by the optical emitter and subjected to a touch object, and convert the optical signal into an electric signal; and the optical circuit module is configured to drive and control the optical emitter, and analyze the electric signal. When a finger touches the fingerprint sensor, the touch also acts on the optical emitter and photoelectric converter of the optical module. In this way, fingerprint signals and optical signals of the finger may be simultaneously collected, such that it may be judged whether the touch leaves an authentic fingerprint, which lowers the risk that the fingerprint identification apparatus is cracked by a spoof fingerprint and improves the security.