Dual Fingerprint Scanning Modules for Resolution Power Trade-off
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Solution Overview
Problem
Current fingerprint recognition technologies in mobile terminals face challenges in simultaneously achieving high resolution and low power consumption, particularly in scenarios with high security requirements, as increasing the capacitor array density to improve resolution significantly increases power consumption.
Innovation Solution
The implementation of a dual-fingerprint scanning module system, where a first module with a larger scanning area and lower resolution and a second module with a smaller scanning area and higher resolution dynamically switch based on the security requirements of the application scenario, allowing for high resolution when needed while controlling power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the capacitor array density is increased to improve resolution, then the fingerprint recognition resolution is improved, but the power consumption is significantly increased
Solution Approach 1:
The fingerprint scanning function is segmented into two distinct modules: a first fingerprint scanning module with lower resolution and larger scanning area, and a second fingerprint scanning module with higher resolution and smaller scanning area. This segmentation allows the system to use only the high-resolution module when needed, rather than continuously operating a high-density capacitor array, thereby reducing overall power consumption while maintaining the capability for high-resolution scanning when security requirements demand it.
Solution Approach 2:
The system dynamically switches between the first and second fingerprint scanning modules based on the security requirements of the current application scenario. The controller determines whether to activate the high-resolution second module or use the low-resolution first module, making the system adaptable to different security needs. This dynamic operation allows the system to optimize power consumption by using the lower-power first module for general purposes and only activating the higher-power second module when high security is required.
2Measurement precision
If a single high-resolution fingerprint scanning module is used, then the resolution for security scenarios is improved, but the power consumption increases and battery endurance decreases
Solution Approach 1:
The fingerprint scanning capability is divided into two modules with different resolution characteristics. The first module provides basic scanning with lower power consumption, while the second module provides high-resolution scanning when needed. This segmentation eliminates the need for a single high-resolution module to operate continuously, thereby preserving battery endurance while maintaining the capability for high-resolution scanning in security-critical applications.
Solution Approach 2:
The system changes the operational parameters by switching between two different fingerprint scanning configurations. Instead of maintaining a fixed high-resolution configuration that consumes more power, the system dynamically adjusts which module is active based on security requirements. This parameter change allows the system to achieve high resolution when needed while maintaining lower average power consumption to preserve battery endurance.
3Measurement precision
If a dual-fingerprint scanning module system is used, then high resolution can be achieved when needed, but the device complexity increases
Solution Approach 1:
The fingerprint scanning system is segmented into two specialized modules, each optimized for specific scanning needs. The first module handles general-purpose scanning with larger area coverage, while the second module handles high-resolution scanning for security applications. This segmentation allows each module to be simpler in its own right compared to a single universal high-resolution module, as each can be optimized for its specific function, thereby managing overall device complexity while achieving high resolution when needed.
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 effectively meets the high resolution demands of special fingerprint application scenarios while maintaining reasonable power consumption, ensuring the battery endurance of mobile terminals.
Implementation Method 1
a touch screen contains approximately ten thousand miniaturized capacitors therein to form a capacitor array... When a user puts his or her finger on the touch screen, the skin and a conductive plate of the touch screen form a capacitor. Since distances between ridges and valleys at different positions of the fingerprint are not equal, capacitance of each unit changes with the unequal distance between the ridges and valleys of the fingerprint.
Data Source
AI summary
The present disclosure provides a fingerprint scanning method and a mobile terminal. The mobile terminal includes a first fingerprint scanning module and a second fingerprint scanning module. The method includes: monitoring an operation performed on a scanning area of the first fingerprint scanning module; when an operation instructing to enter a preset fingerprint application scenario is monitored, transmitting a wake-up instruction to the second fingerprint scanning module. The wake-up instruction is configured to instruct the second fingerprint scanning module to enter an operation mode.