Electrostatic Charge Sensing for Earbud Touch and In-Ear Detection
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Solution Overview
Problem
Current electronic devices face challenges in user input detection due to size constraints, high processing complexity, power consumption, and cost, particularly in portable audio devices like TWS earphones or earbuds.
Innovation Solution
The use of electrostatic charge sensors, comprising receiving and ground electrodes electrically isolated from each other, to detect touch, in-ear, and swipe gestures by measuring electrostatic charge variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If buttons are used for touch detection, then user input detection is enabled, but device space is occupied and user comfort is reduced
Solution Approach 1:
The patent combines the touch detection function with the existing electrode structure already present in the earbud device. The receiving electrode and ground electrode, which are already part of the device's electrical architecture, are utilized to detect both touch gestures and in-ear status simultaneously, eliminating the need for separate buttons or dedicated touch sensor components.
Solution Approach 2:
The electrode system is designed to serve multiple functions: it detects touch gestures on the device surface, detects whether the earbud is properly inserted in the user's ear, and provides electrical connection for audio functionality. This multi-functional approach eliminates the need for dedicated components for each function, saving device space.
2Ease of operation
If accelerometers are used for touch detection, then touch input is detected, but false positive rate increases
Solution Approach 1:
The patent introduces an electrostatic charge sensor as an intermediary between the physical touch action and the digital signal processing. The sensor measures electrostatic charge variations caused by finger proximity or contact, providing a more accurate and reliable touch detection mechanism that is not susceptible to the false positives that plague accelerometer-based systems.
3Measurement precision
If touch sensors are used for touch detection, then accurate touch input is detected, but power consumption and cost increase
Solution Approach 1:
The electrostatic charge sensor leverages the natural electrostatic properties of human skin and the existing electrical fields in the device. The sensor passively detects charge variations without requiring active transmission signals or complex processing, enabling accurate touch detection with minimal power consumption. The system uses the body's own electrostatic characteristics as the detection mechanism.
4Ease of operation
If proximity sensors are used for in-ear detection, then in-ear status is detected, but device space is consumed
Solution Approach 1:
The patent merges the in-ear detection function with the touch detection electrode system. The same receiving electrode and ground electrode configuration used for touch gestures also serves to detect whether the earbud is inserted in the user's ear by measuring electrostatic charge variations caused by the proximity of ear tissue.
Solution Approach 2:
The electrode system is designed to simultaneously perform multiple detection functions: touch gesture recognition on the device surface and in-ear status detection. This universal approach eliminates the need for dedicated proximity sensors, saving valuable device space in compact earbud designs.
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 provides a low false positive rate, low power consumption, and low cost method for user input detection, making it suitable for portable electronic devices.
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-car detection.