Fingerprint Sensing Circuit Dynamic Zone Selection
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Solution Overview
Problem
The design of fingerprint sensing zones in electronic devices is challenging as too small zones increase processing time, while too large zones may hinder accurate fingerprint sensing, necessitating an optimal size for efficient fingerprint identification.
Innovation Solution
An electronic circuit and device with a fingerprint sensing circuit that determines multiple fingerprint sensing zones based on a touch area and rearranges sensing data from these zones to optimize fingerprint sensing and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of the fingerprint sensing zone is too small, then the number of fingerprint sensing zones increases, but the fingerprint sensing circuit spends more time receiving sensing signals
Solution Approach 1:
The display panel is divided into multiple fingerprint sensing zones with different sizes. The fingerprint sensing circuit determines at least two fingerprint sensing zones to perform fingerprint sensing operation according to a touch area, and rearranges the fingerprint sensing data from these zones. This segmentation allows the system to select an optimal combination of zones rather than using uniformly small zones, thereby reducing total reception time while maintaining sensing accuracy.
2Loss of time
If the size of the fingerprint sensing zone is too large, then the number of fingerprint sensing zones decreases, but the fingerprint sensing circuit has problems determining scanning zones for fingerprint sensing
Solution Approach 1:
The fingerprint sensing circuit dynamically determines which fingerprint sensing zones to activate based on the detected touch area. Instead of using fixed, uniformly large zones that are difficult to scan, the system adapts the selection of zones according to the actual touch position and area, making the scanning process more efficient and easier to manage.
Solution Approach 2:
Different fingerprint sensing zones are designed with different sizes and characteristics. The system selects specific zones based on the local touch area characteristics, matching the sensing resources to the actual needs of each sensing operation rather than using a uniform zone structure.
3Area of stationary object
If the display panel includes too many fingerprint sensing zones, then the coverage area increases, but the fingerprint sensing circuit spends more time processing data from multiple zones
Solution Approach 1:
Instead of activating all available fingerprint sensing zones, the system selectively activates only the necessary zones based on the touch area. This partial action approach ensures sufficient coverage for the actual sensing need while avoiding the processing overhead of unnecessary zones, thereby improving overall processing efficiency.
Data Source
AI summary
An electronic circuit adapted to drive a panel including a plurality of fingerprint sensing zones is provided. The electronic circuit includes a fingerprint sensing circuit. The fingerprint sensing circuit is configured to determine at least two fingerprint sensing zones to perform a fingerprint sensing operation according to a touch area and receive a fingerprint sensing signal corresponding to fingerprint sensing data from the at least two fingerprint sensing zones. The fingerprint sensing circuit rearranges the fingerprint sensing data from the at least two fingerprint sensing zones. In addition, an electronic device and a method for sensing a fingerprint image are also provided.