Fingerprint Identification Panel Electrode Merging
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Solution Overview
Problem
Existing fingerprint identification devices require a large number of electrodes and corresponding signal lead wires, leading to increased size and space occupation, which hinders the arrangement of more electrodes for improved detection accuracy.
Innovation Solution
A fingerprint identification panel with intersecting first and second electrode strips, a scanning device, and an identification device that forms capacitors between the strips to determine fingerprint morphology using fewer lead wires by providing driving and sensing signals, allowing for more electrodes in the same space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of fingerprint identification electrodes are used to improve detection accuracy, then the number of electrodes increases, but the space occupied by lead wires increases
Solution Approach 1:
The patent merges the functions of multiple lead wires into a single shared lead wire by electrically connecting multiple second electrodes in series. This allows multiple fingerprint identification electrodes to share common signal transmission paths, significantly reducing the total number of lead wires required while maintaining the ability to detect signals from each electrode individually.
Solution Approach 2:
The shared lead wire structure enables a single lead wire to serve multiple functions by transmitting signals from multiple second electrodes simultaneously. The lead wire acts as a common signal path that can identify fingerprints across different regions of the panel, making the system more space-efficient without sacrificing detection capability.
2Ease of operation
If each fingerprint identification electrode is connected with a separate signal lead wire, then signal transmission is direct, but the device size increases
Solution Approach 1:
Multiple second electrodes are electrically connected in series to form electrode strips, allowing them to share common lead wires. This merging approach reduces the overall device size by eliminating redundant lead wire connections while maintaining efficient signal transmission through the shared electrical paths.
Solution Approach 2:
The patent transitions from a one-to-one electrode-lead wire mapping to a many-to-one mapping by organizing electrodes into strips along the y-direction. This dimensional reorganization allows multiple electrodes to be connected in series, reducing the number of lead wires required and compacting the device structure without compromising signal transmission 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
This configuration enhances fingerprint identification accuracy by increasing the number of electrodes that can be arranged without increasing the device size, reducing the space needed for lead wires and enabling real-time fingerprint recognition and touch point positioning.
Implementation Method 1
a capacitor is formed between each of the plurality of first electrode strips and one second electrode strip adjacent to the first electrode strip
Data Source
AI summary
Provided is a fingerprint identification panel comprising multiple first electrode strips, multiple second electrode strips, a scanning device, a sensing signal providing device and an identification device, wherein the first electrode strips and the second electrode strips are insulated from and intersected with each other; the scanning device is configured to provide driving signals to the plurality of first electrode strips in turn, the sensing signal providing device is configured to provide sensing signals to the second electrode strips, and a capacitor is formed between each first electrode strip and a second electrode strip adjacent thereto; the plurality of second electrode strips are connected with the identification device, and transmit signals that reflect quantities of the capacitors to the identification device, the identification device is configured to determine a morphology of a fingerprint based on the signals.