Electrostatic Charge Sensing for Earbud Touch and In-Ear Detection
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Solution Overview
Problem
Current electronic devices, particularly portable audio devices like true wireless stereo earphones, face challenges with user input detection due to size constraints, high false positive rates, high power consumption, and cost issues with existing button-based and sensor technologies.
Innovation Solution
The use of electrostatic charge sensors for touch, in-ear, and swipe detection, employing receiving and ground electrodes to measure electrostatic charge variations, providing a low false positive rate, low power consumption, and cost-effective solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If buttons are used for user input detection, then user interaction is enabled, but the device occupies valuable space and may be unpleasant for the user when in the ear
Solution Approach 1:
The patent replaces mechanical buttons with an electrostatic charge sensor system that detects user input through electrostatic charge variations. The sensor includes a receiving electrode and ground electrode that detect touch gestures, in-ear detection, and swipe gestures without requiring physical button structures, thereby eliminating the space occupation issue while maintaining user interaction capability
Solution Approach 2:
The electrostatic charge sensor serves multiple functions: touch detection, in-ear detection, and swipe gesture detection. This multi-functional approach replaces what would traditionally require multiple separate components or buttons, optimizing the use of limited device space while providing comprehensive user interaction options
2Ease of operation
If accelerometers are used for touch detection, then user input detection is enabled, but the false positive rate is high
Solution Approach 1:
The patent replaces accelerometer-based touch detection with an electrostatic charge sensor that directly measures electrostatic charge variations on the receiving electrode. This substitution eliminates the indirect motion-based detection method that causes false positives, providing more reliable and accurate touch detection by directly sensing the electrostatic field changes caused by user contact
3Ease of operation
If touch sensors are used for user input detection, then user interaction is enabled, but power consumption and cost are high
Solution Approach 1:
The patent employs an electrostatic charge sensor that measures electrostatic charge variations rather than using traditional capacitive or resistive touch sensor methods. This parameter-based detection approach uses simpler circuitry and lower power consumption while maintaining effective user input detection capability, making it suitable for battery-powered portable devices
4Ease of operation
If proximity sensors are used for in-ear detection, then in-ear detection is enabled, but valuable real estate is consumed for a single feature
Solution Approach 1:
The electrostatic charge sensor system performs both touch gesture detection and in-ear detection functions using the same receiving and ground electrodes. When the device is inserted in the user's ear, the electrostatic charge variation on the receiving electrode indicates in-ear detection, eliminating the need for a separate dedicated proximity sensor and optimizing device space utilization
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
Enables accurate and efficient user input detection with reduced power consumption and costs, suitable for portable devices, enhancing user interaction without occupying valuable space.
Implementation Method 1
A touch gesture is detected based on electrostatic charge variation on the receiving electrode
Data Source
AI summary
The present disclosure is directed to input detection for electronic devices using electrostatic charge sensors. The devices and methods disclosed herein utilize electrostatic charge sensors to detect various touch gestures, such as long and short touches, single/double/triple taps, and swipes; and perform in-ear detection.