Resonant Sensor Auto-Centering for Virtual Button Detection
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Solution Overview
Problem
Existing mobile devices with mechanical buttons face issues such as aging, wear, and difficulty in achieving waterproofing, necessitating the development of sensors that provide acceptable sensitivity, power consumption, and size for detecting user interaction with virtual human-machine interfaces.
Innovation Solution
A system comprising a resistive-inductive-capacitive sensor, a driver, and a measurement circuit that determines and modifies the driving frequency based on measured changes in resonant frequency to enhance sensing capabilities for virtual button interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical buttons are used in mobile devices, then user interaction capability is provided, but aging and wear reduce device reliability and lifespan
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 capacitive element that changes capacitance or resonant frequency when a finger approaches or contacts it, eliminating mechanical moving parts and their associated wear and aging problems.
Solution Approach 2:
The patent introduces an intermediary measurement circuit that indirectly detects user interaction through changes in electrical properties (capacitance, resonant frequency) rather than direct mechanical contact. This intermediary electrical field acts as a mediator between the user's finger and the sensor, avoiding direct mechanical wear.
2Reliability
If mechanical buttons are used in mobile devices, then user interaction capability is provided, but waterproofing becomes difficult to achieve
Solution Approach 1:
The patent replaces mechanical buttons with a capacitive sensing system that detects user interactions through changes in electrical field properties. Since there are no mechanical moving parts, the sensor can be fully sealed within the device housing, making waterproofing straightforward while maintaining full user interaction capability through touch or proximity detection.
3Volume of moving object
If sensor size is reduced for compact device design, then device compactness is improved, but sensor sensitivity decreases
Solution Approach 1:
The patent employs a resonant sensor that operates at its natural resonant frequency, where the sensor structure vibrates with maximum amplitude for a given excitation. This resonant operation provides enhanced sensitivity that compensates for the reduced sensor size, allowing compact dimensions without sacrificing detection capability.
Solution Approach 2:
The patent measures changes in resonant frequency or capacitance values as the primary sensing mechanism. By monitoring parameter changes (frequency shifts, capacitance variations) rather than relying on large physical displacements or complex mechanical structures, the sensor achieves high sensitivity in a compact form factor.
4Measurement precision
If sensor sensitivity is increased for better interaction detection, then user interaction detection capability is improved, but power consumption increases
Solution Approach 1:
The patent uses periodic excitation signals at the sensor's resonant frequency to drive the sensing operation. By applying energy only periodically at optimal intervals and frequencies, the system maintains high sensitivity while minimizing continuous power consumption compared to DC-biased or continuously active sensing schemes.
Solution Approach 2:
The patent exploits the sensor's natural resonant vibration to amplify the sensing signal. When excited at its resonant frequency, the sensor structure vibrates with maximum efficiency, providing high sensitivity output for minimal input energy. This resonant amplification reduces the power required to achieve a given sensitivity level.
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 improves the detection of user interactions with virtual interfaces by providing sensitive, power-efficient, and compact sensor systems, mimicking the feel of mechanical buttons while ensuring device durability and waterproofing.
Implementation Method 1
determine a measured change in a resonant frequency of the resistive-inductive-capacitive sensor
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 determine a measured change in a resonant frequency of the resistive-inductive-capacitive sensor and based on the measured change, modify the driving frequency.