Dual Optical Fingerprint Sensors for 3D Pattern Authentication
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Solution Overview
Problem
Optical fingerprint sensors struggle to differentiate between three-dimensional fingerprint patterns and two-dimensional printed images, leading to security vulnerabilities due to the inability to sense phase information, which can result in unauthorized access.
Innovation Solution
Employ multiple optical fingerprint sensors with complementary apertures to filter light, enabling the acquisition of both amplitude and phase information, allowing for enhanced fingerprint authentication by identifying stereoscopic patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical fingerprint sensor is used to simplify the device structure, then the device complexity is reduced, but the ability to sense phase information and differentiate 3D fingerprints from 2D images deteriorates
Solution Approach 1:
The fingerprint sensing function is divided into multiple independent optical fingerprint sensors, each with its own aperture. This segmentation allows each sensor to capture different light components (amplitude and phase information), enabling the system to differentiate between 3D fingerprints and 2D images while maintaining a modular device structure.
Solution Approach 2:
The patent transitions from single-dimension light sensing (amplitude only) to multi-dimensional light sensing by adding phase information detection. This is achieved by incorporating multiple sensors with complementary apertures that filter different light components, thereby capturing both amplitude and phase dimensions of reflected light.
2Reliability
If multiple optical fingerprint sensors with complementary apertures are used to sense phase information, then the reliability of fingerprint authentication is improved, but the device complexity increases
Solution Approach 1:
Multiple optical fingerprint sensors with complementary apertures are merged into a unified sensing system. The sensors work together to capture both amplitude and phase information, combining their individual capabilities to achieve enhanced security verification while sharing common processing infrastructure.
Solution Approach 2:
The multiple optical fingerprint sensors serve multiple functions: individual sensors can operate independently for basic amplitude-based recognition, while collectively they enable phase information detection for 3D verification. This multi-functionality allows the system to adapt to different security requirements without requiring separate dedicated systems.
3Ease of operation
If optical fingerprint sensors are used to enable in-display authentication, then the ease of operation is improved, but the ability to sense phase information deteriorates due to the optical detector limitations
Solution Approach 1:
The patent employs asymmetric aperture designs in the multiple optical fingerprint sensors, where each sensor's aperture is configured to filter specific light components. This asymmetry enables the system to capture different aspects of reflected light (amplitude vs. phase) that would be impossible with symmetric, identical sensors, thereby recovering phase information while maintaining in-display 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 approach significantly enhances security by ensuring that only genuine three-dimensional fingerprint patterns are authenticated, reducing the risk of forgery and improving the reliability of fingerprint recognition.
Implementation Method 1
a first aperture configured to filter light with a first component, a second aperture configured to filter light with a second component complementary to the first component
Implementation Method 2
light is emitted to an external object (or user's finger, fingerprint, sample) and is reflected; the reflected light is collected
Data Source
AI summary
An electronic device is provided. The electronic device includes a display, a first fingerprint sensor, a second fingerprint sensor, a memory, and a processor configured to acquire a first fingerprint image corresponding to an external object requesting fingerprint authentication through the first fingerprint sensor, acquire a second fingerprint image corresponding to the external object through the second fingerprint sensor, produce a phase image based on a differential component of an area in which the first fingerprint image and the second fingerprint image overlap, identify whether the external object is a stereoscopic pattern having a three-dimensional shape through the phase image, identify whether at least one of the first fingerprint image or the second fingerprint image matches with registered user fingerprint authentication data, and when the external object is a stereoscopic pattern and the registered fingerprint authentication data is matched, succeed in the fingerprint authentication for the external object.