Fingerprint Identification Device With Separate Signal Lines
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Solution Overview
Problem
Current fingerprint identification devices face challenges in reducing scanning time, increasing scanning frequency, and improving identification accuracy due to the reuse of data lines for both signal writing and reading, which prolongs the scanning process and decreases accuracy.
Innovation Solution
A fingerprint identification device with a matrix arrangement of units, featuring separate signal input and reading lines and independent switch units in each unit, allowing simultaneous loading and reading of signals across rows, reducing scanning time and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If data lines are reused for both writing detection signals and reading identification signals, then device complexity is reduced, but scanning time increases and scanning frequency decreases
Solution Approach 1:
The patent divides the single data line function into two separate lines: data input lines for writing detection signals and data output lines for reading identification signals. This segmentation eliminates the time conflict between writing and reading operations, allowing simultaneous execution of both operations on different line pairs, thereby reducing total scanning time while maintaining reasonable device complexity.
Solution Approach 2:
The patent transitions from a time-sequential operation mode (write then read on same lines) to a spatial-parallel operation mode (write and read simultaneously on different line pairs). By adding the dimension of parallel data paths, the system achieves faster scanning without proportionally increasing overall system complexity.
2Device complexity
If data lines are reused for both writing and reading signals, then device complexity is reduced, but identification accuracy decreases
Solution Approach 1:
By separating data input lines and data output lines, the patent eliminates signal interference between writing and reading operations. Each line pair is dedicated to a specific function, ensuring clean signal transmission and accurate capacitance measurement, thereby improving fingerprint identification accuracy without excessive complexity increase.
Solution Approach 2:
The patent introduces switch units as intermediary components that control signal flow between fingerprint identification electrodes and the respective data lines. These switches ensure that detection signals and identification signals are transmitted through dedicated paths without cross-interference, maintaining high measurement precision.
3Device complexity
If scanning is performed sequentially for each row before moving to the next row, then device complexity is reduced, but scanning frequency is limited
Solution Approach 1:
The patent segments the scanning process into independent row operations that can be executed in parallel. Each row has its own gate line and dedicated data line pairs, allowing multiple rows to be scanned simultaneously through parallel data input and output operations, thereby increasing scanning frequency while maintaining manageable control complexity.
Solution Approach 2:
The patent enables continuous useful action by allowing data signal writing and identification signal reading to occur simultaneously across different row groups. This parallel execution eliminates idle time between writing and reading phases, maximizing the utilization of scanning resources and increasing overall scanning speed.
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 enables faster scanning and improved identification accuracy by allowing simultaneous signal loading and reading across rows, reducing the overall scanning time and increasing efficiency.
Implementation Method 1
The area where the fingerprint identification electrode 01 is located generates a corresponding capacitance due to capacitance coupling
Data Source
AI summary
The present application discloses a fingerprint identification device, a driving method thereof, a display panel and a display apparatus. The fingerprint identification device comprises a plurality of fingerprint identification units arranged in a matrix, a signal input line for loading a detection signal and a signal reading line for reading an identification signal which are in one-to-one correspondence with each column of fingerprint identification units. Each fingerprint identification unit comprises a fingerprint identification electrode, a first switch unit and a second switch unit connected to the signal input line respectively. The first switch unit is used for controlling an electrical conduction between the fingerprint identification electrode and the signal input line, the second switch unit is used for controlling an electrical conduction between the fingerprint identification electrode and the signal reading line.