Resonant RLC Phase Sensing With Compensation for Displacement Accuracy
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Solution Overview
Problem
Current mobile devices face challenges in detecting user interactions with human-machine interfaces due to limitations in sensor sensitivity, power consumption, and size, particularly in replicating the feel of mechanical buttons using traditional sensors.
Innovation Solution
A resonant phase sensing system comprising a resistive-inductive-capacitive sensor and a measurement circuit, along with a compensation circuit, measures phase information to determine displacement and correct for changes in physical properties, enhancing sensor sensitivity and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional force or pressure sensors are used to detect user interaction, then the device can provide vibrational feedback, but the sensor sensitivity and power consumption are not optimal
Solution Approach 1:
The patent replaces traditional mechanical force or pressure sensors with a resonant phase sensing system that uses electromagnetic principles. A resistive-inductive-capacitive (RIC) sensor forms an RLC circuit whose resonant phase shift is measured to detect displacement, eliminating the need for mechanical sensing elements while improving sensitivity and reducing power consumption.
Solution Approach 2:
The patent measures changes in the resonant phase parameter of an RLC circuit to detect displacement. By monitoring the phase shift at the resonant frequency rather than using direct force measurement, the system achieves higher sensitivity with lower power consumption, as the electromagnetic resonance can be detected with minimal energy input.
2Measurement precision
If traditional sensors are used, then user interaction can be detected, but the sensor size may be large
Solution Approach 1:
The patent replaces bulky mechanical sensors with a compact RLC resonant circuit. The sensor comprises electrical components (resistor, inductor, capacitor) that form a resonant circuit, allowing displacement detection through electromagnetic field changes rather than mechanical contact, thereby significantly reducing sensor size while maintaining or improving detection accuracy.
3Measurement precision
If phase information is measured to determine displacement, then accurate detection is achieved, but changes in other physical properties may cause measurement errors
Solution Approach 1:
The patent employs a feedback mechanism where the measured resonant phase information is used to adjust the excitation frequency or other circuit parameters. This closed-loop approach compensates for drifts in physical properties such as temperature or component aging, maintaining measurement reliability while preserving high displacement measurement accuracy.
Solution Approach 2:
The patent performs preliminary calibration or characterization of the RLC circuit's physical properties before actual measurement. By pre-determining the relationship between phase shift and displacement under various conditions, the system can compensate for changes in physical properties during operation, ensuring reliable measurements without sacrificing accuracy.
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 system effectively detects user interactions with improved sensitivity and reduced power consumption, allowing for a more accurate and efficient simulation of mechanical button feedback in mobile devices.
Implementation Method 1
The measurement circuit may be configured to use a phase detector to measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a metal plate relative to the resistive-inductive-capacitive sensor
Implementation Method 2
a resonant phase sensing system comprising a resistive-inductive-capacitive sensor
Data Source
AI summary
A system may include a resonant phase sensing system comprising a resistive-inductive-capacitive sensor and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor, and a compensation circuit. The measurement circuit may be configured to use a phase detector to measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a metal plate relative to the resistive-inductive-capacitive sensor. The compensation circuit may be configured to detect a change in a physical property associated with the resistive-inductive-capacitive sensor other than the displacement and compensate the phase information to correct for the change in the physical property.