Optical Fingerprint Identification Using Active Non-Visible Light
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Solution Overview
Problem
Current fingerprint identification technologies are limited by the passive reception of visible light, restricting the flexible selection of excitation wavelengths, which hampers the ability to distinguish between real and fake fingers and compromises the safety of the identification process.
Innovation Solution
An optical fingerprint identification apparatus that employs non-visible light sources with multiple wave bands, an optical component to collimate and converge signal light, and a fingerprint sensor connected to the light source to actively control the emission of light, allowing for flexible wavelength selection and improved differentiation between real and fake fingers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If visible light is used for fingerprint identification, then the imaging process is simple, but the wavelength selection is limited and the ability to distinguish real and fake fingers is reduced
Solution Approach 1:
The patent implements dynamic wavelength selection by enabling the light source to actively emit at multiple wavelengths rather than passively receiving fixed visible light. The fingerprint sensor controls the light source to emit non-visible light with selectable wavelengths, allowing the system to adapt between different excitation wavelengths (e.g., UV, IR) based on identification needs, thereby resolving the contradiction between wavelength flexibility and system complexity.
Solution Approach 2:
The patent changes the fundamental parameter of light wavelength from visible range to non-visible range (UV, IR, etc.) and enables active control over emission wavelength. By transitioning from passive visible light reception to active non-visible light emission with controllable wavelength parameters, the system achieves enhanced adaptability while managing complexity through integrated control architecture.
2Reliability
If passive visible light reception is used, then the device structure is simple, but the safety and distinction ability between real and fake fingers is compromised
Solution Approach 1:
The system transitions from static passive light reception to dynamic active light emission where the fingerprint sensor controls the light source to emit non-visible light at specific wavelengths. This dynamic control enables enhanced security through multi-wavelength imaging capability while integrating the control function within the existing sensor architecture to manage complexity.
Solution Approach 2:
The patent introduces an optical component as an intermediary between the light source and fingerprint sensor. This intermediary includes wavelength selection filters and optical paths that enable controlled emission of non-visible light at specific wavelengths, enhancing security through wavelength-specific imaging while managing system complexity through modular optical design.
3Measurement precision
If multiple light emitting wave bands are used, then the ability to distinguish real and fake fingers is improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the fingerprint sensor system to perform multiple imaging operations at different wavelengths using the same sensor and light source combination. The system can selectively emit and detect at various non-visible wavelengths (UV, IR, etc.) to capture different tissue penetration depths and scattering characteristics, enhancing fingerprint distinction ability while utilizing a unified sensor platform to avoid proportional complexity increases.
Solution Approach 2:
The patent achieves enhanced measurement precision by changing the wavelength parameter of emitted light to non-visible ranges and enabling selective emission at multiple wavelengths. By controlling the light source to emit at specific wavelengths and using corresponding filters in the optical path, the system captures wavelength-specific fingerprint characteristics that improve real vs. fake finger distinction while managing complexity through parameter-controlled operation.
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 solution enhances the ability to distinguish between real and fake fingers, improving the safety and effectiveness of fingerprint identification by utilizing non-visible light sources with multiple wave bands and an integrated optical component and sensor system.
Implementation Method 1
at least one non-visible light source, configured to emit non-visible light to a human finger to provide excitation light for fingerprint identification
Implementation Method 2
configured to receive signal light scattered and reflected by the human finger
Implementation Method 3
signal light scattered and reflected by the human finger
Implementation Method 4
collimate and/or converge the signal light
Implementation Method 5
collimate and/or converge the signal light
Implementation Method 6
a fingerprint sensor, disposed under the optical component, and configured to perform imaging based on the signal light passing through the optical component
Data Source
AI summary
An embodiment of the present application provides an optical fingerprint identification apparatus, which includes: at least one non-visible light source, configured to emit non-visible light to a human finger to provide excitation light for fingerprint identification; an optical component, disposed under a fingerprint detecting area of the display screen, and configured to receive signal light scattered and reflected by the human finger; and a fingerprint sensor configured to perform imaging based on the signal light passing through the optical component, where a working wave band of the fingerprint sensor is the same as a light emitting wave band of the non-visible light source, a number of the working wave bands is the same as the number of the light emitting wave bands, and the fingerprint sensor is connected to the non-visible light source, and is configured to control the non-visible light source to actively emit light.