Multi-Sensor Under-Screen Fingerprint Capture via Dynamic Activation
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Solution Overview
Problem
Under-screen fingerprint identification technologies face challenges in balancing power consumption and user experience due to the increased time required for fingerprint matching over large areas, leading to higher power consumption and potential user frustration.
Innovation Solution
A multi-sensor-based under-screen fingerprint capturing method and system that determines and activates only the effectively pressed fingerprint sensors, reducing unnecessary power usage by controlling other sensors to a non-working state, and uses optical fingerprint sensors with optical path modulators and light convergence techniques to enhance imaging and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large area of fingerprint identification is implemented under the screen, then the security and coverage of fingerprint identification are improved, but the fingerprint matching time increases and power consumption increases
Solution Approach 1:
The fingerprint identification area is divided into multiple independently controllable sensor regions. When a user presses the screen, only the sensor regions corresponding to the pressed area are activated for fingerprint collection, while other regions remain inactive. This segmentation allows the system to maintain a large overall sensor area for security and coverage while consuming power only in the actively used portions, directly resolving the contradiction between large identification area and power consumption.
2Area of stationary object
If a large area of fingerprint identification is implemented under the screen, then the security and coverage of fingerprint identification are improved, but the fingerprint matching time increases
Solution Approach 1:
The fingerprint identification area is divided into multiple independently controllable sensor regions. When a user presses the screen, only the sensor regions corresponding to the pressed area are activated for fingerprint collection, while other regions remain inactive. This segmentation allows the system to maintain a large overall sensor area for security and coverage while consuming power only in the actively used portions, directly resolving the contradiction between large identification area and power consumption.
Solution Approach 2:
Instead of activating the entire fingerprint sensor array, the system activates only the partial region that corresponds to the user's finger pressing area. This partial action reduces the amount of data that needs to be processed for fingerprint matching, thereby reducing matching time while still capturing sufficient fingerprint information from the active region to maintain security.
3Area of stationary object
If multiple fingerprint sensors are activated for large area coverage, then the fingerprint information coverage is improved, but unnecessary sensors increase power consumption
Solution Approach 1:
The system dynamically adjusts which fingerprint sensors are activated based on real-time detection of the user's pressing area. The touch screen detects where the user is pressing, and the system accordingly activates only the fingerprint sensors in that specific region. This dynamic adaptation ensures that fingerprint sensing coverage matches the actual user interaction area, preventing unnecessary sensors from consuming power while maintaining adequate coverage where needed.
Solution Approach 2:
The system uses feedback from the touch screen's detection of the pressing area to control which fingerprint sensors are activated. The touch screen provides real-time information about the user's contact position and area, and this feedback is used to selectively power on only the relevant fingerprint sensor regions, optimizing the balance between sensing coverage and energy consumption.
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 reduces power consumption, improves fingerprint matching speed, and enhances user experience by capturing fingerprint information efficiently while maintaining security levels through adjustable sensor thresholds and illumination control.
Implementation Method 1
an optical fingerprint sensor is provided under the touch screen, the optical fingerprint sensor includes a light source and a photo detector array
Implementation Method 2
the optical fingerprint sensor further includes an optical path modulator disposed above the photo detector array
Data Source
Figure 1A~2
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Figure 7~8
AI summary
Provided are a multi-sensor-based under-screen fingerprint capturing method and system and an electronic device, applied to an under-screen fingerprint capturing system including multiple fingerprint sensors, where the method includes: determining an effectively pressed fingerprint sensor among the multiple fingerprint sensors according to a pressing region of a user on a display screen, where each fingerprint sensor corresponds to a sensing region, and sensing regions corresponding to the multiple fingerprint sensors form a fingerprint capturing region of the under-screen fingerprint capturing system; controlling the effectively pressed fingerprint sensor to be in a working state and another fingerprint sensor other than the effectively pressed fingerprint sensor to be in a non-working state; and capturing fingerprint information of the user via the effectively pressed fingerprint sensor.