Optical Fingerprint Sensor Ambient Light Frequency Adaptation
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Solution Overview
Problem
Optical fingerprint recognition technology is affected by ambient lights, leading to errors in fingerprint data collection due to interference from various light frequencies, which compromises the accuracy of fingerprint matching.
Innovation Solution
A method that determines the intensity of ambient lights at different frequencies and adjusts the internal light source of the optical fingerprint sensor to emit light at the frequency with the lowest intensity, minimizing interference and improving data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical fingerprint recognition technology is used, then fingerprint recognition sensitivity is improved, but accuracy deteriorates due to ambient light interference
Solution Approach 1:
The patent changes the operating parameters of the light source by adjusting its emission frequency based on ambient light conditions. The processor controls the light source to emit at different frequencies depending on the detected ambient light spectrum, thereby optimizing fingerprint recognition accuracy under varying lighting conditions while maintaining high recognition sensitivity.
Solution Approach 2:
The patent implements a feedback mechanism where the processor continuously monitors ambient light conditions and adjusts the light source frequency accordingly. The system detects ambient light intensity and spectral characteristics, then feeds this information back to modify the light source emission parameters, creating a closed-loop control system that maintains optimal fingerprint recognition performance.
2Device complexity
If the light source emits light at fixed frequency, then device complexity is reduced, but measurement precision deteriorates under varying ambient light conditions
Solution Approach 1:
The patent transitions from a static light source configuration to a dynamic one where the light source frequency can be adjusted in real-time. The processor dynamically modifies the light source emission parameters based on detected ambient light conditions, enabling the system to adapt to changing environmental conditions while maintaining measurement precision without excessive complexity.
3Productivity
If ambient light intensity is not considered, then processing speed is improved, but reliability deteriorates due to light interference
Solution Approach 1:
The patent performs preliminary detection of ambient light conditions before conducting fingerprint recognition. The processor first measures the ambient light intensity and spectral characteristics, then pre-adjusts the light source frequency to optimal values before fingerprint data collection begins. This preliminary action ensures that the fingerprint recognition process proceeds quickly with high reliability, as the system is already optimized for the current lighting conditions.
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 approach enhances the accuracy of fingerprint data collection by reducing the influence of ambient lights, leading to improved fingerprint matching results.
Implementation Method 1
an intensity of each of ambient lights having at least two different frequencies at a current time point is determined via an optical sensor of a terminal
Implementation Method 2
The optical fingerprint sensor receives the reflected lights and converts the reflected lights into fingerprint data for processing
Data Source
AI summary
Provided are a method for fingerprint collection and related products. The method includes the following. In response to a receipt of a fingerprint collection instruction, an intensity of each of ambient lights having at least two different frequencies at a current time point is determined via an optical sensor of the terminal. A target frequency is determined, where the target frequency is a frequency of one ambient light having a lowest ambient light intensity among the ambient lights having the at least two different frequencies. Control light emission of an internal light source of an optical fingerprint sensor of the terminal at least according to the target frequency so as to collect fingerprint data via the optical fingerprint sensor.