Fingerprint Sensor Merging Physiological Signal Detection
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Solution Overview
Problem
Conventional physiological feature sensing systems are large, inflexible, and require high computing power and high power consumption, limiting their reliability and cost-effectiveness.
Innovation Solution
A fingerprint sensing device and wearable electronic device equipped with an image sensor and processor that senses a finger to obtain both fingerprint images and physiological characteristic signals, enabling effective fingerprint recognition and anti-counterfeiting functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photosensitive elements and peripheral circuit elements are used for physiological feature sensing, then sensing capability is achieved, but system size becomes large and complexity increases
Solution Approach 1:
The patent merges fingerprint sensing and physiological information sensing into a single image sensor system. The image sensor simultaneously captures both fingerprint images and physiological characteristic signals (such as blood flow, heart rate) through the same hardware platform, eliminating the need for separate photosensitive elements and peripheral circuits for each function. This integration directly reduces system size and complexity while maintaining sensing capability.
Solution Approach 2:
The image sensor is designed to perform multiple functions: it serves as both a fingerprint sensing device and a physiological information sensing device. By making the image sensor universal, the system achieves both fingerprint recognition and physiological monitoring (e.g., pulse, blood flow) without requiring additional specialized components, thereby reducing overall system complexity and size.
2Reliability
If conventional physiological feature sensing systems are used, then sensing functions are provided, but computing power requirements and power consumption increase
Solution Approach 1:
The patent combines fingerprint sensing and physiological sensing operations into a single continuous image capture process. The processor continuously senses the finger through the image sensor, obtaining both fingerprint images and physiological characteristic signals simultaneously. This merged approach eliminates redundant sensing operations and reduces overall power consumption while maintaining both sensing functions.
Solution Approach 2:
The system performs continuous sensing of the finger through the image sensor during both fingerprint sensing period and physiological information sensing period. This continuous action allows the processor to obtain both fingerprint images and physiological characteristic signals in an uninterrupted manner, improving efficiency and reducing the total energy required compared to separate discrete sensing operations.
3Loss of information
If separate fingerprint sensing and physiological sensing systems are used, then comprehensive information is obtained, but data utilization efficiency decreases
Solution Approach 1:
The patent merges the data acquisition processes for fingerprint information and physiological information into a single image sensor output stream. The processor analyzes the same set of image data to extract both fingerprint patterns and physiological characteristics (such as blood flow changes, pulse signals), thereby obtaining comprehensive information while maximizing data utilization efficiency through single-source processing.
Solution Approach 2:
The image sensor and processor system is designed to universally extract multiple types of information from the same sensing data. By making the system multi-functional in terms of data analysis, it simultaneously provides fingerprint recognition capability and physiological monitoring capability from a single data source, eliminating data redundancy and improving overall data utilization efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces system complexity and size, improves data utilization, and achieves effective fingerprint recognition and physiological information measurement while providing an anti-counterfeiting function.
Implementation Method 1
The processor senses a finger placed above the fingerprint sensing area through the image sensor to obtain a first fingerprint image
Implementation Method 2
The processor continuously senses the finger placed above the fingerprint sensing area through the image sensor to obtain a physiological characteristic signal
Data Source
AI summary
A fingerprint sensing device and a wearable electronic device are provided. The fingerprint sensing device includes an image sensor and a processor. The image sensor is arranged below a fingerprint sensing area. The processor is coupled to the image sensor. The processor senses a finger placed above the fingerprint sensing area through the image sensor during a fingerprint sensing period to obtain a first fingerprint image. The processor continuously senses the finger placed above the fingerprint sensing area through the image sensor during a physiological information sensing period, so as to obtain a physiological characteristic signal.