Fingerprint Sensor Interference Mitigation via Dynamic Parameter Adjustment
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Solution Overview
Problem
Fingerprint sensors located below or integrated within display devices in electronic devices face increased interference from display and other electronic components, affecting their operation.
Innovation Solution
A sensor controller that receives a control signal corresponding to potential interference and adjusts sensing parameters to mitigate or avoid interference, allowing the sensor to operate effectively by synchronizing operations with other components in the electronic device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fingerprint sensor is located below or integrated within the display device, then the border region can be minimized and display area maximized, but the sensor is exposed to increased interference from the display device and other electronic components
Solution Approach 1:
The controller receives advance notification of interference events (such as display refresh cycles or communication bursts) and proactively adjusts sensing parameters or pauses sensing operations before the interference occurs. This preliminary action prevents interference from degrading sensor readings while maintaining full-display integration.
Solution Approach 2:
The sensing parameters (such as sensing frequency, timing, or duration) are dynamically adjusted based on real-time interference conditions. The system transitions from static sensing to adaptive sensing that responds to changing electromagnetic environment, allowing reliable operation throughout the entire display area.
2Device complexity
If the fingerprint sensor is integrated within the display device, then device complexity is reduced and manufacturing is simplified, but interference from nearby electronic components affects sensor operation
Solution Approach 1:
The system implements feedback mechanisms where the controller monitors interference levels and adjusts sensing operations accordingly. When interference is detected or predicted, the system automatically modifies sensing parameters or schedules, ensuring reliable authentication despite the integrated layout and nearby electronic components.
Solution Approach 2:
Sensing parameters such as frequency, timing, amplitude, or duration are changed in response to interference conditions. This allows the integrated sensor to adapt its operation to avoid electromagnetic interference from display refreshes, communication modules, or other nearby components, maintaining reliability in the compact integrated design.
3Productivity
If sensing operations are performed continuously, then authentication speed is improved, but interference from display and electronic components increases and affects accuracy
Solution Approach 1:
Instead of continuous sensing, the system uses periodic sensing operations synchronized with display refresh cycles and other interference patterns. By timing sensing operations to occur during interference-free periods, the system maintains authentication speed while improving image quality and reducing electromagnetic interference effects.
Solution Approach 2:
The system skips sensing operations during known interference periods (such as display refresh cycles or communication bursts) and concentrates sensing during clean periods. This selective approach rushes through authentication during optimal windows, maintaining speed while avoiding interference that would degrade measurement precision.
Data Source
AI summary
A controller for a sensor is configured to receive a control signal from an external device, the control signal corresponding to potential interference. The controller adjusts a sensing parameter using the control signal to avoid the potential interference. The potential interference is at least one of an electrical interference and an optical interference. The controller may include a sensor module that includes circuitry configured to acquire resulting signals with sensing elements using the adjusted sensing parameter.