Dynamic Light Power Adjustment for Fingerprint Recognition
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Solution Overview
Problem
Optical fingerprint recognition under non-self-luminous panels, such as LCDs, faces recognition failures due to deviations in fingerprint position affecting light emission, leading to insufficient or excessive light reflection, which results in poor image quality and recognition failure.
Innovation Solution
A fingerprint recognition apparatus with dynamically adjustable power levels of light-emitting modules based on fingerprint position and image characteristics, using a touch detecting module, processing module, and light-emitting power adjusting module to optimize light emission for proper image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fingerprint area fully covers the IR light module, then the light coverage is maximized, but the image becomes overexposed and fingerprint details disappear
Solution Approach 1:
The patent applies local quality by dividing the light-emitting modules into different groups (first light-emitting modules and second light-emitting modules) with different emission characteristics. The first group uses a first emission pattern while the second group uses a second emission pattern, allowing different regions of the light source to have different properties tailored to the specific fingerprint area coverage needs.
Solution Approach 2:
The patent changes the emission parameters (emission pattern and power level) of the light-emitting modules based on the detected fingerprint area coverage. When the fingerprint area is small, the system adjusts the emission pattern and power of specific light-emitting modules to increase light intensity. When the fingerprint area is large, it adjusts differently to prevent overexposure, thereby maintaining optimal image quality across varying coverage conditions.
2Power
If the fingerprint area is too small to cover the IR light module, then the light emission is sufficient, but the reflected light to the sensor is insufficient causing dark images
Solution Approach 1:
The patent applies local quality by dividing the light-emitting modules into different groups (first light-emitting modules and second light-emitting modules) with different emission characteristics. The first group uses a first emission pattern while the second group uses a second emission pattern, allowing different regions of the light source to have different properties tailored to the specific fingerprint area coverage needs.
Solution Approach 2:
The patent changes the emission parameters (emission pattern and power level) of the light-emitting modules based on the detected fingerprint area coverage. When the fingerprint area is small, the system adjusts the emission pattern and power of specific light-emitting modules to increase light intensity. When the fingerprint area is large, it adjusts differently to prevent overexposure, thereby maintaining optimal image quality across varying coverage conditions.
3Device complexity
If the fingerprint position deviates from the IR light module position, then the system structure remains simple, but the image quality deteriorates due to improper light reflection
Solution Approach 1:
The patent applies dynamics by making the emission pattern and power level of the light-emitting modules dynamically adjustable based on the detected fingerprint position and area coverage. Instead of a fixed emission configuration, the system adapts the light emission characteristics in real-time according to the fingerprint placement, enabling the system to maintain high recognition accuracy across various fingerprint positions without increasing structural complexity.
Solution Approach 2:
The patent changes the emission parameters (emission pattern and power level) of the light-emitting modules based on the detected fingerprint area coverage. When the fingerprint area is small, the system adjusts the emission pattern and power of specific light-emitting modules to increase light intensity. When the fingerprint area is large, it adjusts differently to prevent overexposure, thereby maintaining optimal image quality across varying coverage 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
Enhances fingerprint recognition rates by ensuring proper light levels are maintained for accurate image capture, regardless of fingerprint position, thereby improving the reliability of fingerprint recognition.
Implementation Method 1
a plurality of light-emitting modules, emitting light to the finger on the panel
Implementation Method 2
the amount of light reflected to the fingerprint sensor from the fingerprint
Data Source
AI summary
A fingerprint recognition apparatus with dynamically adjustable power levels of light-emitting modules is introduced, including: a touch detecting module detecting a touch coordinate and a touch area of a finger on a panel; a plurality of light-emitting modules emitting light to the finger on the panel; a processing module coupling to the touch detecting module and the plurality of light-emitting modules and outputting a setting value according to the touch coordinate, the touch area and positions of the plurality of light-emitting modules; a light-emitting power adjusting module adjusting power levels of the plurality of light-emitting modules according to the setting value; and an image outputting module outputting the fingerprint according to the fingerprint image.