Phase Detection Pixels for Anti-Spoofing Fingerprint Authentication
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Solution Overview
Problem
Recent increases in spoofing attacks on fingerprint recognition systems have compromised the security of biometric authentication, as existing technologies fail to effectively differentiate between genuine and counterfeit fingerprints.
Innovation Solution
A display device equipped with phase detection pixels that emit light during fingerprint recognition, generating both fingerprint image and phase signals to determine whether a fingerprint is genuine or counterfeit through machine learning-based authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional optical fingerprint recognition is used, then fingerprint authentication can be performed conveniently, but the system becomes vulnerable to spoofing attacks with counterfeit fingerprints
Solution Approach 1:
The patent transitions from traditional 2D optical fingerprint recognition to 3D phase detection by introducing phase detection pixels that measure the optical path length difference. This dimensional change enables the system to capture depth information and distinguish genuine fingerprints from counterfeit ones based on their three-dimensional surface characteristics, thereby resolving the vulnerability to spoofing attacks while maintaining authentication convenience
2Reliability
If phase detection pixels are introduced to detect fingerprint phase information, then anti-spoofing capability is improved, but device complexity increases
Solution Approach 1:
The patent makes the display pixels serve dual functions: they act as both display elements and light sources for fingerprint recognition. By utilizing the existing display pixel structure for both display and phase detection purposes, the system avoids adding separate complex illumination components, thereby improving anti-spoofing capability while minimizing the increase in device complexity
Solution Approach 2:
The patent combines the fingerprint sensor structure with the display panel structure, where phase detection pixels are integrated within the display pixel array. This merging of functions and structures eliminates the need for separate fingerprint sensor components, reducing overall device complexity while enabling phase-based anti-spoofing detection
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 the anti-spoofing performance by identifying two-dimensional fake fingerprints based on phase signals, thereby improving the security and reliability of fingerprint authentication.
Implementation Method 1
A portion of display pixels among the plurality of display pixels are configured to emit light in a fingerprint recognition mode
Implementation Method 2
the image sensor is configured to generate a fingerprint image signal and a fingerprint phase signal based on reflected light of a fingerprint
Implementation Method 3
the image sensor includes a pixel array including a plurality of pixels, at least a portion of the plurality of pixels includes phase detection pixels
Data Source
AI summary
A display device is provided. The display device includes a display panel including a pixels; a fingerprint recognition sensor including an image sensor disposed under a first surface of the display panel; and a processor to control the display panel and the fingerprint recognition sensor. A portion of display pixels are configured to emit light in a fingerprint recognition mode. The image sensor includes pixels, at least a portion of the pixels are phase detection pixels. The image sensor generates a fingerprint image signal and a fingerprint phase signal based on reflected light received while the portion of display pixels emit light. The main processor is further configured to perform an anti-spoofing operation or a fingerprint authentication operation based on the fingerprint image signal and the fingerprint phase signal.