Fingerprint Sensor Electrode Array for Single-Instance Recognition
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Solution Overview
Problem
Conventional fingerprint sensors require multiple data acquisitions, making the process complicated and time-consuming, and struggle to achieve high accuracy in a single instance.
Innovation Solution
A fingerprint sensor design featuring multiple sensing electrodes and fewer driving electrodes, with phase inverters and differential amplifiers to enhance sensitivity, and a processing unit to calculate scraping speed, along with shielding electrodes to reduce noise and signal interference, integrated into a display apparatus for improved touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple data acquisitions are implemented for fingerprint verification, then accuracy is improved, but the process becomes complicated and time-consuming
Solution Approach 1:
The sensor is divided into multiple sensing electrodes arranged in parallel, each capable of independently detecting fingerprint data. This segmentation allows simultaneous data collection from multiple points across the fingerprint surface, enabling complete data acquisition in a single instance rather than requiring multiple sequential readings.
Solution Approach 2:
The patent transitions from a single-line or sequential sensing approach to a two-dimensional array of sensing electrodes that can simultaneously capture fingerprint data across the entire surface. This dimensional expansion allows all necessary data to be collected at once, eliminating the need for multiple acquisition passes.
2Measurement precision
If multiple sensing electrodes are used to improve sensitivity, then data acquisition capability is enhanced, but device complexity increases
Solution Approach 1:
Multiple sensing electrodes are merged into a unified sensor array that operates simultaneously. The sensing electrodes are integrated with driving electrodes in a coordinated manner, where each sensing electrode corresponds to multiple driving electrodes, creating a unified detection system that improves sensitivity without proportionally increasing overall complexity.
Solution Approach 2:
The sensing electrodes serve multiple functions: they detect fingerprint patterns, determine scraping speed through signal timing, and provide spatial information about the fingerprint surface. This multi-functionality allows a single electrode array to perform what would traditionally require multiple separate systems.
3Reliability
If shielding electrodes are added to reduce noise and signal interference, then signal quality is improved, but device complexity increases
Solution Approach 1:
Shielding electrodes are introduced as intermediary elements positioned between the driving and sensing electrodes. These shielding electrodes act as mediators that block electromagnetic interference and noise from affecting the sensitive sensing electrodes, thereby improving signal quality without requiring fundamental changes to the core sensing mechanism.
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 design significantly improves sensitivity and accuracy by allowing all data to be acquired in fewer instances, enhancing the speed and reliability of fingerprint recognition.
Implementation Method 1
a plurality of sensing electrodes provided in parallel with each other and disposed perpendicularly to the driving electrode... each driving electrode corresponds to a plurality of ones of the sensing electrodes
Data Source
AI summary
The fingerprint sensor includes: at least one driving electrode disposed perpendicularly to a desired direction of movement of a finger; and a plurality of sensing electrodes provided in parallel with each other and disposed perpendicularly to the driving electrode, the plurality of sensing electrodes being not overlapped with the driving electrode; the number of the driving electrode is less than the number of the sensing electrodes such that each driving electrode corresponds to a plurality of ones of the sensing electrodes.