Multi-lined Biometric Sensor for Fingerprint Imaging
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Solution Overview
Problem
Current fingerprint sensor technologies face a trade-off between cost and user friendliness, with swipe sensors being cheaper but less intuitive and placement sensors being more complex and expensive due to their larger sensing areas and more complex electronics.
Innovation Solution
A biometric sensor device with a limited number of swipe sensor arrays spaced to cover a typical fingerprint area, allowing for a short perpendicular swipe, generating partial images that are combined to form a complete image, reducing processing needs and incorporating velocity and direction measurement for efficient data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a placement sensor is used to cover a typical fingerprint area, then the sensing area is sufficient and user operation is intuitive, but the device complexity and manufacturing cost increase due to more sensing elements and complex electronics
Solution Approach 1:
The sensing area is divided into multiple swipe sensor arrays arranged in a grid pattern, where each array captures a portion of the fingerprint. The sensor device processes and combines data from these segmented arrays to form a complete fingerprint image, thereby achieving large-area coverage without requiring a single complex placement sensor
2Device complexity
If a swipe sensor with smaller sensing area is used, then the device complexity and cost are reduced, but the sensing area is insufficient to cover a typical fingerprint placement sensor area
Solution Approach 1:
Multiple swipe sensor arrays are arranged in a two-dimensional grid pattern, transforming the one-dimensional swipe capability into a two-dimensional sensing coverage. This dimensional expansion allows the system to cover a fingerprint placement sensor area using multiple smaller swipe sensor units
3Measurement precision
If multiple sweep sensors with non-integer multiple spacing are used to increase image resolution, then the measurement precision improves, but the device complexity and data processing requirements increase
Solution Approach 1:
The sensor device combines data from multiple swipe sensor arrays through coordinated processing, merging the partial fingerprint images captured by each array into a single high-resolution composite image. This merging approach achieves enhanced measurement precision while managing device complexity through systematic data integration
Data Source
AI summary
A biometric sensor device for measuring structures and properties of an object of organic tissue, especially a fingerprint sensor, includes a plurality of linear sensing arrays adapted to generate a respective plurality of measurement data at a predetermined sampling rate for a predetermined time period, based upon a sliding movement of the organic tissue over the plurality of linear sensing arrays, and a processor adapted to generate a partial image of the organic tissue from each of the respective plurality of measurement data. The processor is further adapted to generate a complete image of the organic tissue by combining the partial image generated from each of the plurality of measurement data, wherein the complete image is larger than each of the partial images, and the predetermined time period is defined so as to measure a section of said organic tissue given by the distance between two linear arrays.