Fingerprint Detection Circuit Preventing Transistor Drift
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Solution Overview
Problem
Conventional optical fingerprint detection control circuits have a short period of validity for fingerprint identification, leading to performance degradation and reduced reliability.
Innovation Solution
A fingerprint detection control circuit comprising a sensing circuitry, resetting circuitry, control circuitry, and conversion circuitry, which includes a photovoltaic conversion sub-circuitry and storage sub-circuitry, is designed to convert optical signals into photovoltage signals and manage voltage connections to prevent characteristic drift, ensuring the performance of transistors and prolonging the validity of fingerprint identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical fingerprint detection control circuits are used, then the device complexity is low, but the validity period of fingerprint identification is short and reliability is reduced
Solution Approach 1:
The control circuit is divided into distinct functional modules: sensing circuitry for optical signal detection, resetting circuitry for voltage control, conversion circuitry for signal transformation, and output circuitry for signal routing. This segmentation allows each module to be optimized independently while maintaining overall system reliability and preventing characteristic drift.
Solution Approach 2:
The resetting circuitry proactively manages voltage connections before characteristic drift can occur in transistors. By pre-controlling the electrical connections and potentials in the sensing circuitry, the system prevents performance degradation before it happens, thereby extending the validity period of fingerprint identification.
2Productivity
If the sensing circuitry continuously operates, then the productivity of fingerprint detection is high, but the transistors experience characteristic drift leading to performance degradation
Solution Approach 1:
The resetting circuitry operates periodically to refresh and reset the voltage connections in the sensing circuitry. This periodic resetting prevents continuous operation from causing characteristic drift in transistors, while still maintaining high detection productivity through the efficient photovoltaic conversion and rapid signal processing capabilities.
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 circuit effectively prolongs the validity of fingerprint identification by preventing characteristic drift in transistors and ensuring the performance of photodiodes, thereby enhancing the reliability and duration of fingerprint detection.
Implementation Method 1
The sensing circuitry is electrically connected to a conversion control end, and configured to convert a received optical signal into a photovoltage signal
Implementation Method 2
The photovoltaic conversion sub-circuitry is configured to convert a received optical signal into a photocurrent signal
Data Source
AI summary
A fingerprint detection control circuit, a fingerprint detection control method and a display device. The fingerprint detection control circuit includes a sensing circuitry, a resetting circuitry, a control circuitry and a conversion circuitry. The control circuitry provides a switch control signal to a control end of the resetting circuitry under the control of a first control signal. The resetting circuitry provides a resetting voltage to a conversion control end under the control of a potential at its control end. The conversion circuitry converts a photovoltage signal into a corresponding current signal under the control of a potential at the conversion control end when a first voltage end is electrically connected to a first signal output end, and outputs the current signal via the first signal output end.