Fingerprint Identification Circuit Parallel Scanning Matrix
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Solution Overview
Problem
Existing fingerprint identification circuits are time-consuming and have low accuracy in practical applications.
Innovation Solution
A fingerprint identification circuit with a matrix arrangement of reading sub-circuits and fingerprint identification sub-circuits, each comprising a writing sub-circuit, sensing sub-circuit, converting and amplifying sub-circuit, and output sub-circuit, where the converting and amplifying sub-circuit converts sensing signals into current signals, amplifies them, and the reading sub-circuit converts these signals back into voltage signals for improved differentiation between peak and valley fingerprint textures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional fingerprint identification circuit with sequential scanning is used, then the circuit structure is simple, but the identification time is long and accuracy is low
Solution Approach 1:
The patent divides the fingerprint identification circuit into multiple independent fingerprint identification sub-circuits arranged in a matrix, with each sub-circuit capable of independently scanning and identifying fingerprint features. This segmentation allows parallel processing of multiple fingerprint regions simultaneously, reducing overall identification time while maintaining high accuracy through dedicated processing circuits for each region.
Solution Approach 2:
The patent transitions from a single sequential scanning approach to a matrix-based parallel scanning approach by adding a spatial dimension. Multiple fingerprint identification sub-circuits are arranged in rows and columns, enabling simultaneous scanning of multiple fingerprint regions across different spatial locations, thereby reducing identification time without sacrificing accuracy.
2Productivity
If a conventional fingerprint identification circuit with sequential scanning is used, then the circuit structure is simple, but the scanning speed is slow
Solution Approach 1:
The patent segments the fingerprint identification function into multiple independent sub-circuits that can operate simultaneously. Each sub-circuit is equipped with its own writing sub-circuit, sensing sub-circuit, converting and amplifying sub-circuit, and output sub-circuit, enabling parallel scanning operations that significantly increase scanning speed while keeping each individual sub-circuit relatively simple.
Solution Approach 2:
The patent merges multiple fingerprint identification sub-circuits into a unified matrix structure that shares common control resources and reading sub-circuits. This combining approach enables parallel scanning across multiple regions while avoiding the need for completely separate independent circuits, thus balancing increased scanning speed with acceptable overall circuit complexity.
3Measurement precision
If a conventional fingerprint identification circuit is used, then the reading sub-circuit is simple, but the sensing signal processing capability is insufficient
Solution Approach 1:
The patent introduces a converting and amplifying sub-circuit as an intermediary between the sensing sub-circuit and the reading sub-circuit. This intermediary component converts the sensing signals into a format suitable for reading and amplification, enhancing the reading sub-circuit's capability to process and differentiate between peak and valley fingerprint textures without requiring the reading sub-circuit itself to be overly complex.
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
This configuration enhances the accuracy and efficiency of fingerprint identification by allowing simultaneous scanning and output operations, reducing scanning time and improving the fluency and report rate of fingerprint recognition.
Implementation Method 1
when the sensing electrodes 10 are touched by a finger, since the fingerprint texture includes two morphologies consisting of peaks and valleys and a distance between a peak and the sensing electrode 10 is different from that between a valley and the sensing electrode 10, therefore, the influence of the peak on the capacitance of the sensing electrode 10 corresponding thereto is different from that of the valley on the capacitance of the sensing electrode 10 corresponding thereto
Data Source
AI summary
A fingerprint identification circuit comprises multiple reading sub-circuits, and multiple fingerprint identification sub-circuits each column of fingerprint identification sub-circuits are connected with one reading sub-circuit, each fingerprint identification sub-circuit comprises a writing sub-circuit, a sensing sub-circuit and a output sub-circuit, the writing sub-circuit is connected with a scan signal input terminal; the sensing sub-circuit senses a fingerprint and transmits a sensing signal to the output sub-circuit; the output sub-circuit outputs the sensing signal upon the writing sub-circuit is turned off each fingerprint identification sub-circuit further comprises: a converting and amplifying sub-circuit provided between the sensing sub-circuit and the output sub-circuit, for converting the sensing signal into a current signal, amplifying the current signal and outputting it to the output sub-circuit, the reading sub-circuit is connected with the output sub-circuit for reading the sensing signal and converting the current signal into a voltage signal to output.