Fingerprint Sensing Device Dynamic Voltage Control
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Solution Overview
Problem
Fingerprint sensing devices face challenges in achieving higher signal amplitude and reducing noise interference, as existing systems often rely on constant voltage differences that do not optimize signal acquisition and noise reduction effectively.
Innovation Solution
The proposed solution involves a fingerprint sensing system with multiple sensors and a power supply circuit that alternates between different voltage levels during a scan phase and a read phase, creating distinct voltage differences to enhance signal amplitude and minimize noise interference, using a high-voltage input terminal and a low-voltage input terminal with specific voltage configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a constant voltage difference is used during both scan and read phases, then the device operation is simple, but the signal amplitude is not maximized and noise interference cannot be effectively reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant voltage difference to a dynamic voltage difference that changes based on operational phase. During the scan phase, a first voltage difference is applied to maximize signal amplitude, while during the read phase, a second voltage difference is applied to reduce noise interference. This dynamic adjustment optimizes performance for each specific operational stage.
Solution Approach 2:
The patent implements periodic action by alternating between different voltage difference configurations in a cyclical manner corresponding to the scan and read phases. The power supply circuit periodically switches between the first voltage difference (during scan) and the second voltage difference (during read), creating a rhythmic pattern of voltage adjustment that synchronizes with the sensing device's operational cycle.
2Measurement precision
If higher voltage is applied during scan phase to increase signal amplitude, then noise interference may increase during read phase
Solution Approach 1:
The patent applies segmentation by dividing the operational cycle into distinct phases (scan phase and read phase) and applying different voltage difference configurations to each phase. This segmentation allows the system to optimize for signal amplitude during scanning while separately optimizing for noise reduction during reading, preventing the trade-off from affecting overall performance.
Solution Approach 2:
The patent implements parameter changes by adjusting the voltage difference parameter based on the operational phase. The power supply circuit changes the voltage difference from the first value (during scan) to the second value (during read), thereby modifying the electrical parameters to suit the specific requirements of each phase and achieving both high signal amplitude and low noise interference.
3Measurement precision
If constant high voltage difference is maintained, then signal amplitude remains high, but power consumption increases continuously
Solution Approach 1:
The patent applies periodic action by cycling through different voltage difference configurations according to the operational phase. During the scan phase, the higher first voltage difference is applied to achieve high signal amplitude. During the read phase, the lower second voltage difference is applied, reducing power consumption while maintaining adequate performance. This periodic switching optimizes the balance between signal quality and energy efficiency.
Solution Approach 2:
The patent implements dynamics by making the voltage difference adjustable and phase-dependent rather than constant. The power supply circuit dynamically switches between the first voltage difference (higher power consumption during scan) and the second voltage difference (lower power consumption during read), thereby optimizing power usage according to the actual operational requirements of each phase.
Data Source
AI summary
A fingerprint sensing system has a fingerprint sensing device and a power supply circuit. The fingerprint sensing device has a high-voltage input terminal and a low-voltage input terminal. During scan phases of the fingerprint sensing device, the power supply circuit provides a first voltage to the high voltage input terminal and provides a second voltage to the low voltage input terminal. During the read phases of the fingerprint sensing device, the power supply circuit provides a third voltage to the high voltage input terminal and provides a fourth voltage to the low voltage input terminal. A first voltage difference is between the first voltage and the second voltage. A second voltage difference is between the third voltage and the fourth voltage. The first voltage difference is greater than the second voltage difference.