Color-Pattern In-Display Fingerprint Sensing Against Fake Prints
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Solution Overview
Problem
Existing fingerprint sensors in display devices struggle to accurately distinguish between real and fake fingerprints, which can compromise security in applications requiring personal authentication.
Innovation Solution
A display device with a photoelectric sensor and a fingerprint detector that analyzes light diffused from the skin in non-emission areas of the fingerprint sensing area, using a fake-determination image pattern with different color patterns to determine the authenticity of a fingerprint based on light illuminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a photosensitive type fingerprint sensor is used in the display device, then the fingerprint sensing function can be integrated into the display, but the sensor cannot accurately distinguish between real and fake fingerprints
Solution Approach 1:
The fingerprint sensing area is divided into multiple pixel regions that can independently control light emission. The sensor array is segmented into individual photoelectric sensor pixels that can detect light from specific directions. This segmentation allows the system to analyze light diffusion patterns from different fingerprint regions to distinguish real from fake fingerprints.
Solution Approach 2:
Different regions of the display panel are assigned different functions: some pixels emit light for fingerprint illumination, while others detect light for authentication. The patent applies local quality by making specific pixel regions have different emission and detection characteristics, allowing the system to analyze light diffusion patterns from specific areas to determine fingerprint authenticity.
2Measurement precision
If additional sensors or complex analysis methods are added to detect fake fingerprints, then detection accuracy improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The display pixels serve multiple functions: they act as both display elements and light sources for fingerprint illumination. The photoelectric sensor pixels serve dual purposes by detecting both display content and fingerprint authentication data. This multi-functionality eliminates the need for separate dedicated fingerprint sensing components, reducing device complexity while maintaining detection accuracy.
Solution Approach 2:
The system uses feedback by analyzing the light diffusion patterns returned from the fingerprint to the sensor. The photoelectric sensors detect the reflected light and provide feedback signals that are processed to determine fingerprint authenticity. This feedback mechanism enables fake fingerprint detection using the existing display and sensor infrastructure without adding complex external components.
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 accuracy and reliability of fingerprint detection without significantly increasing manufacturing costs or complexity, effectively identifying fake fingerprints.
Implementation Method 1
a photoelectric sensor disposed on one surface of the display panel to sense light
Implementation Method 2
detecting a fake fingerprint by analyzing light which is diffused from skin and then sensed in a non-emission area
Data Source
AI summary
A method for driving a display device is performed by the display device. The method includes: displaying a first image including user convenience information through a display panel; generating sensing data corresponding to a fingerprint sensing area by using a photoelectric sensor; and determining whether a sensed fingerprint corresponding to the sensing data is a fake fingerprint by comparing expected sensing light illuminance information based on the first image with sensed light illuminance information of the sensing data. The first image includes a first color pattern in the fingerprint sensing area of the display panel. A fake-determination image pattern includes the first color pattern and a second color pattern different from the first color pattern.