Resonant Phase Sensing for Virtual Button Displacement Detection
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Solution Overview
Problem
Traditional mobile devices with mechanical buttons face issues such as aging, wear, and tear, which reduce their lifespan and make them difficult to manufacture as waterproof devices, while existing sensors for virtual buttons lack sufficient sensitivity, power efficiency, and compact size for effective user interaction feedback.
Innovation Solution
A system utilizing a resistive-inductive-capacitive sensor driven by a driver at a specific frequency, coupled with a measurement circuit to determine displacement through phase information, which changes impedance in response to user interaction, mimicking the feel of mechanical buttons using a linear resonant actuator for haptic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical buttons are used in mobile devices, then user interaction capability is provided, but the device becomes susceptible to aging, wear, and tear reducing useful life
Solution Approach 1:
The patent replaces mechanical buttons with a virtual button interface that uses capacitive sensing and linear resonant actuator (LRA) technology. The mechanical pressing action is substituted with detection of capacitive changes when a finger approaches or touches the screen, and mechanical feedback is replaced with haptic feedback from the LRA, eliminating wear and tear while maintaining user interaction capability
Solution Approach 2:
The patent creates a virtual copy of the mechanical button experience through software interface elements that simulate button appearance and haptic feedback that mimics mechanical clicking sensation. The LRA generates vibrations that replicate the tactile feel of pressing a physical button, providing a copied sensory experience without the physical wear associated with actual mechanical components
2Reliability
If mechanical buttons are used in mobile devices, then user interaction capability is provided, but it becomes difficult to manufacture waterproof devices
Solution Approach 1:
The patent eliminates mechanical buttons that would create seals and potential water ingress points by replacing them with a fully virtual interface. The button functionality is achieved through capacitive sensing and haptic feedback mechanisms that can be implemented as flat, sealed layers within the device structure, maintaining waterproof integrity while providing tactile user interaction
3Measurement precision
If traditional sensors are used for virtual button detection, then user interaction can be detected, but sensor sensitivity, power consumption, and size are insufficient
Solution Approach 1:
The patent employs a linear resonant actuator (LRA) that operates at its resonant frequency to generate haptic feedback. By driving the sensor and actuator at resonant frequencies, the system achieves high sensitivity for detecting finger proximity and touch with minimal power consumption, as resonance amplifies the response to small input forces while requiring less driving energy
Solution Approach 2:
The patent utilizes changes in capacitive parameters (capacitance value and phase) in response to finger proximity and touch. The measurement circuit detects these parameter changes with high sensitivity by monitoring the resonant frequency and phase shift of the LC circuit, enabling precise detection while consuming low power through efficient resonant operation
4Measurement precision
If resonant phase sensing is implemented, then displacement measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single measurement circuit that simultaneously drives the LC sensor at resonant frequency, measures phase information, determines displacement, and controls the LRA haptic feedback. This multi-functional approach achieves high measurement precision while minimizing device complexity by consolidating operations rather than using separate dedicated circuits for each function
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 solution enhances the sensitivity and power efficiency of user interaction detection in mobile devices, providing a more durable and waterproof design by accurately measuring displacement and generating effective haptic feedback, thus improving the user experience and device longevity.
Implementation Method 1
a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information associated with the resistive-inductive-capacitive sensor
Implementation Method 2
the displacement of the mechanical member causes a change in an impedance of the resistive-inductive-capacitive sensor
Implementation Method 3
linear resonant actuators (LRAs) and other vibrational actuators (e.g., rotational actuators, vibrating motors, etc.) are increasingly being used in mobile devices to generate vibrational feedback
Data Source
AI summary
A system may include a resistive-inductive-capacitive sensor, a driver configured to drive the resistive-inductive-capacitive sensor at a driving frequency, and a measurement circuit communicatively coupled to the resistive-inductive-capacitive sensor and configured to measure phase information associated with the resistive-inductive-capacitive sensor and based on the phase information, determine a displacement of a mechanical member relative to the resistive-inductive-capacitive sensor, wherein the displacement of the mechanical member causes a change in an impedance of the resistive-inductive-capacitive sensor.