Large-Area Fingerprint Sensing via Multi-Circuit Image Splicing
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Solution Overview
Problem
Conventional fingerprint sensing technologies face challenges in achieving high accuracy and large-area sensing due to the limitations of sensor size and lens magnification, leading to twisted image edges and low yield rates.
Innovation Solution
A fingerprint sensing apparatus and method utilizing multiple optical fingerprint sensing circuits to capture images from various sensing areas, with a processing circuit splicing these images together to form an integrated large-area image, enhancing effective usage and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large sensor is used to achieve large-area sensing, then the sensing area is improved, but the manufacturing yield rate deteriorates
Solution Approach 1:
The patent divides the large sensing area into multiple smaller sensing areas, each covered by a separate optical fingerprint sensing circuit. This segmentation allows each sensor to operate within an optimal size range for high yield rate while collectively providing large-area coverage through image splicing of multiple circuits
2Area of stationary object
If a lens with greater magnification ability is used to achieve large-area sensing, then the sensing area is improved, but the image edge quality deteriorates due to twisting
Solution Approach 1:
Instead of using a single lens with high magnification that causes edge twisting, the patent segments the sensing area into multiple regions, each served by its own optical fingerprint sensing circuit. This eliminates the need for extreme lens magnification and prevents image distortion at edges while maintaining large-area coverage
Solution Approach 2:
The patent combines multiple sensed images from different sensing areas into an integrated sensed image through image splicing. This merging approach achieves large-area sensing capability without relying on a single distorted lens, thereby maintaining image quality across the entire sensing area
Data Source
AI summary
A fingerprint sensing apparatus having a large-area sensing mechanism is provided that includes at least three optical fingerprint sensing circuits and a processing circuit. The at least three optical fingerprint sensing circuits are configured to perform sensing within a plurality of sensing areas to obtain a plurality of sensed images, wherein each of the sensing areas corresponds to one of the optical fingerprint sensing circuits. The processing circuit is electrically coupled to the optical fingerprint sensing circuits to receive the sensed images and is configured to splice the sensed images together to form an integrated sensed image.