Fingerprint Sensor Matrix Block Scanning for Fast Unlocking
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Solution Overview
Problem
Conventional full-screen fingerprint unlocking technologies on mobile devices suffer from slow unlocking speeds and high power consumption due to the need to scan large areas, which is inefficient and power-intensive.
Innovation Solution
A method utilizing a sensor matrix divided into blocks controlled by independent switch terminals, where only the area covered by the fingerprint is scanned, employing a multiplexer to enable fast and normal scanning modes, reducing the scanning area and time, and minimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If full-screen fingerprint recognition scanning is performed on entire areas of screens, then fingerprint recognition coverage is improved, but unlocking speed deteriorates and power consumption increases
Solution Approach 1:
The sensor matrix is divided into multiple blocks (e.g., 4 blocks), each controlled by an independent switch terminal. This segmentation allows the system to activate only the specific block containing the fingerprint rather than scanning the entire sensor matrix, thereby maintaining full-screen recognition capability while significantly improving unlocking speed and reducing power consumption.
Solution Approach 2:
The system performs scanning only on the partial area where the fingerprint is located rather than the entire sensor matrix. By using the multiplexer to select and activate only the necessary block(s), the system achieves fingerprint recognition with reduced scanning time and lower power consumption while still covering the full screen area when needed.
2Area of stationary object
If full-screen fingerprint recognition scanning is performed on entire areas of screens, then fingerprint recognition coverage is improved, but power consumption increases
Solution Approach 1:
The sensor matrix is divided into multiple blocks with independent control through switch terminals. This allows the system to power on only the specific block containing the fingerprint, dramatically reducing power consumption compared to activating the entire sensor matrix, while still providing full-screen recognition coverage when necessary.
Solution Approach 2:
The system performs scanning only on the partial area where the fingerprint is detected, rather than the entire sensor matrix. This selective scanning approach significantly reduces power consumption while maintaining effective fingerprint recognition across the full screen area when needed.
3Reliability
If conventional fingerprint recognition methods scan entire configured areas, then recognition completeness is improved, but scanning time increases
Solution Approach 1:
The sensor matrix is segmented into multiple blocks, each independently controllable. This segmentation enables the system to quickly identify which block contains the fingerprint and scan only that specific block, reducing scanning time while maintaining recognition completeness through the use of multiple blocks that collectively cover the entire sensor area.
Solution Approach 2:
The system scans only the partial area where the fingerprint is located rather than the entire configured area. By using multiple blocks that provide overlapping or comprehensive coverage, the system achieves complete recognition with reduced scanning time by avoiding unnecessary scans of empty areas.
Data Source
AI summary
A method of recognizing a fingerprint is implemented by dividing a sensor matrix of a mobile terminal into a plurality of blocks by rows. Each of the blocks is under control of an independent switch terminal. When performing fingerprint unlocking, only an area covered by the fingerprint is being scanned, while an area not covered by the fingerprint is not to be scanned, thereby significantly reducing a scanning area, shortening a scanning time, improving unlocking efficiency, fulfilling fast fingerprint unlocking, and reducing power consumption. A mobile terminal is also provided and includes a multiplexer configured to divide the sensor matrix into a plurality of blocks. Each of the blocks can independently perform fingerprint recognition scanning. When fingerprint unlocking is carried out, there is no need to scan an entire area of the sensor matrix, thereby improving unlocking efficiency and saving electric energy.