Resonant Phase Detector Compensation for Virtual Button Sensing
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Solution Overview
Problem
Existing mobile devices with mechanical buttons face issues such as aging, wear, and difficulty in manufacturing waterproof designs, prompting a need for sensitive, power-efficient sensors to detect user interactions for virtual button interfaces.
Innovation Solution
A system utilizing a sensor with a variable phase response and a dummy impedance to measure phase information, allowing for accurate detection of user interactions through a resonant phase sensing system, which includes a resistive-inductive-capacitive sensor and a measurement circuit to determine phase responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical buttons are used in mobile devices, then user interaction detection is reliable, but the device becomes susceptible to aging and wear
Solution Approach 1:
The patent replaces mechanical buttons with a capacitive sensor system that uses electrical fields to detect user interactions. The sensor includes a sensor electrode and dummy electrode forming a capacitive structure, where user contact changes the electrical characteristics (capacitance, impedance) without any mechanical moving parts, thereby eliminating wear while maintaining detection reliability
Solution Approach 2:
The patent introduces a dummy electrode as an intermediary element that mirrors the physical characteristics of the sensor electrode but does not detect user interactions. This dummy electrode serves as a reference for compensating phase variations in the measurement circuit, enabling accurate detection of user interactions while eliminating the need for mechanical components
2Ease of operation
If mechanical buttons are used in mobile devices, then user interaction detection is straightforward, but manufacturing waterproof devices becomes difficult
Solution Approach 1:
The patent replaces mechanical buttons with a fully planar capacitive sensor structure that can be manufactured using standard thin-film deposition techniques. The sensor electrode, dummy electrode, and associated circuitry are deposited as continuous layers on the device surface, creating a sealed structure that is inherently waterproof while maintaining ease of user interaction detection through electrical field changes
3Ease of manufacture
If virtual buttons are used in mobile devices, then waterproof manufacturing is enabled, but user interaction detection sensitivity is reduced
Solution Approach 1:
The patent introduces a dummy electrode as an intermediary reference element that experiences the same environmental conditions (temperature, humidity, aging) as the sensor electrode but does not detect user interactions. By measuring the phase difference between the sensor electrode signal and dummy electrode signal, the system compensates for environmental variations and maintains high detection sensitivity in waterproof devices
Solution Approach 2:
The patent implements a feedback mechanism where the phase information from the dummy electrode is used to adjust and compensate the measurement circuit's phase response. This feedback loop continuously corrects for drift and environmental variations, maintaining accurate user interaction detection sensitivity throughout the device's operational life
4Ease of operation
If phase measurement circuits are used in sensors, then user interaction detection is achieved, but phase variations in the circuit reduce measurement accuracy
Solution Approach 1:
The patent uses the dummy electrode as an intermediary reference that experiences identical phase variations from the measurement circuit and environmental conditions. By comparing the phase of the sensor electrode signal against the dummy electrode signal, the system subtracts out the circuit-induced phase variations, isolating only the phase changes caused by user interactions and thereby restoring measurement 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
This solution enhances the sensitivity and power efficiency of user interaction detection, enabling a more reliable and durable virtual button experience in mobile devices while maintaining waterproof capabilities.
Implementation Method 1
resonant phase sensing of resistive-inductive-capacitive sensors
Implementation Method 2
a sensor having a variable phase response
Implementation Method 3
measure first phase information associated with the sensor, measure second phase information associated with the dummy impedance, and determine a phase response of the measurement circuit based on a comparison of the first phase information to the second phase information
Data Source
AI summary
A system may include a sensor having a variable phase response, a dummy impedance having a known phase response, and a measurement circuit communicatively coupled to the sensor and configured to measure first phase information associated with the sensor, measure second phase information associated with the dummy impedance, and determine a phase response of the measurement circuit based on a comparison of the first phase information to the second phase information.