Fingerprint Sensing Control Circuit Multi-Direction Scanning
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Solution Overview
Problem
Fingerprint sensing on large display panels is inefficient due to the need for sequential scanning of all sensing units, leading to longer processing times.
Innovation Solution
A fingerprint sensing control method that scans the finger press area in multiple directions during different periods, allowing for focused scanning on the finger press area and skipping other zones, thereby accelerating the fingerprint reading operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sequential scanning of all sensing units is performed, then complete fingerprint sensing coverage is achieved, but sensing time increases significantly
Solution Approach 1:
The sensing region is divided into multiple scanning regions (first scanning region, second scanning region, third scanning region) that are scanned in different time periods and directions. This segmentation allows parallel or sequential processing of different portions of the fingerprint data, reducing total sensing time while maintaining complete coverage.
Solution Approach 2:
The scanning direction is dynamically changed between different time periods. The first scanning region is scanned in a first direction during a first time period, while the second and third scanning regions are scanned in a second direction (different from the first direction) during a second time period. This dynamic scanning approach optimizes reading efficiency and reduces sensing time.
2Adaptability or versatility
If the sensing region area is increased to improve user operation freedom, then the degree of freedom in user operation is increased, but the reading time for all sensing units increases
Solution Approach 1:
The large sensing region is segmented into multiple scanning regions that can be processed in different time periods. This allows the system to handle larger sensing areas without proportionally increasing the reading time, as different regions are scanned efficiently in parallel or sequential batches.
Solution Approach 2:
The fingerprint sensing is performed in periodic time periods (first time period, second time period) with different scanning directions. This periodic scanning approach allows the system to manage large sensing regions efficiently by breaking down the reading operation into manageable time segments.
Data Source
AI summary
An electronic device and a fingerprint sensing control method thereof are provided. The electronic device includes a touch control circuit and a fingerprint sensing control circuit. The touch control circuit is coupled to the display panel. The touch control circuit performs touch detection on the display panel to obtain a finger press area corresponding to the finger on the display panel. The fingerprint sensing control circuit is coupled to the touch control circuit to obtain a finger press area. The fingerprint sensing control circuit is coupled to the display panel to perform a fingerprint sensing control on a display panel. The fingerprint sensing control circuit scans the finger press area on the display panel in a first direction during a first period and scans the finger press area in a second direction different from the first direction during a second period after the first period.