Fingerprint Pixel Circuit Multiplexing for Light Intensity Detection
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Solution Overview
Problem
The existing optical fingerprint detecting modules under screens have low utilization rates and increased costs, limiting market competitiveness due to their limited functionality in detecting only fingerprints and requiring additional hardware for light intensity detection.
Innovation Solution
A signal collecting circuit with a bias voltage wire and fingerprint pixel circuits connected to a photocurrent collecting module, which outputs and collects photocurrent signals to determine light intensity, enabling both fingerprint and light detection functions without additional hardware, thereby improving utilization and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional hardware is added for light intensity detection, then light intensity detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the fingerprint pixel circuits serve dual purposes: fingerprint detection and light intensity detection. The photoelectric conversion units in the fingerprint pixel circuits generate photocurrent signals that can be collected for both fingerprint authentication and ambient light sensing, eliminating the need for separate light detection hardware
Solution Approach 2:
The patent combines the light detection function with the existing fingerprint detection system by merging the photocurrent signal collection pathway. The bias voltage wire and photocurrent collecting module that originally served only fingerprint detection are now used to collect both fingerprint signals and light intensity information
2Adaptability or versatility
If additional hardware is added for light intensity detection, then light intensity detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes the fingerprint pixel circuits serve dual purposes: fingerprint detection and light intensity detection. The photoelectric conversion units in the fingerprint pixel circuits generate photocurrent signals that can be collected for both fingerprint authentication and ambient light sensing, eliminating the need for separate light detection hardware
Solution Approach 2:
The existing fingerprint pixel circuit components (photoelectric conversion units, bias voltage wire, photocurrent collecting module) serve themselves by also performing light intensity detection. The system uses its own existing infrastructure without requiring external or additional components
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 proposed solution enhances the electronic device's market competitiveness by multiplexing fingerprint pixel circuits for light intensity detection, reducing hardware requirements and costs while maintaining effective fingerprint detection.
Implementation Method 1
a photoelectric conversion unit connected to the bias voltage wire and configured to output a photocurrent signal to the bias voltage wire when light hits the photoelectric conversion unit
Data Source
AI summary
The present disclosure provides a signal collecting circuit, a signal collecting method and an electronic device. A signal collecting circuit includes: a bias voltage wire, multiple fingerprint pixel circuits and a photocurrent collecting module. Each fingerprint pixel circuit includes a photoelectric conversion unit connected to the bias voltage wire and configured to output a photocurrent signal to the bias voltage wire when light hits the photoelectric conversion unit. A photocurrent collecting module is connected to the bias voltage wire and configured to collect the photocurrent signals output by at least part of the photoelectric conversion unit through the bias voltage wire.