Multi-Angular Touch Sensor Pattern for Earbud Input Detection
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Solution Overview
Problem
Touch-sensing devices in wireless earbuds struggle to accurately register user inputs, such as horizontal swipes, when the device is rotated away from its intended angular orientation, leading to misinterpretation of swipes as vertical inputs due to differences in ear shape and comfort.
Innovation Solution
A touch-sensing device with a pattern of multiple sensors arranged to detect user inputs at various angular orientations, including a first sensor with a first outer and inner arc, a second sensor with a second outer and inner arc, and additional sensors positioned between them, allowing detection of horizontal swipes across multiple angular positions by crossing at least three sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single touch sensor is used in wireless earbuds, then the device structure remains simple, but the touch sensor cannot accurately register user inputs when the device is rotated away from its intended angular orientation
Solution Approach 1:
The touch-sensing device is divided into multiple discrete touch sensors (first touch sensor, second touch sensor, third touch sensor, fourth touch sensor) arranged in a specific pattern. Each sensor segment detects inputs along different angular orientations, and the system combines information from multiple segments to accurately determine the user's intended input direction regardless of device rotation angle.
Solution Approach 2:
The patent transitions from a single-dimensional linear sensor arrangement to a two-dimensional angular pattern arrangement. The sensors are positioned to detect inputs along multiple angular orientations (e.g., 0 degrees, 45 degrees, 90 degrees, 135 degrees), adding an angular dimension to the detection capability. This dimensional expansion enables the system to accurately register touches even when the device is rotated, as at least one sensor in the pattern will be optimally oriented to detect the input.
2Adaptability or versatility
If the touch sensor pattern is optimized for one angular orientation, then detection accuracy is high at that orientation, but detection accuracy deteriorates when the device is rotated
Solution Approach 1:
The touch-sensing device is designed with multi-functionality to detect user inputs across multiple angular orientations. The pattern of four touch sensors arranged in a specific geometric configuration enables the same device to accurately detect touches regardless of whether the device is held at 0 degrees, 45 degrees, 90 degrees, or 135 degrees orientation. Each sensor serves multiple detection purposes depending on the device's rotational state.
Solution Approach 2:
The patent employs an asymmetric sensor arrangement where sensors are positioned at specific angular intervals rather than in a symmetric radial pattern. This asymmetric configuration optimizes the detection of horizontal swipes across different device orientations while maintaining a manageable number of sensors. The asymmetric layout ensures that regardless of device rotation, the spatial relationship between sensors captures the directional information needed to distinguish horizontal from vertical inputs.
Data Source
AI summary
An electronic device that includes a touch-sensing device having a plurality of touch sensors arranged in a pattern configured to detect user input at a plurality of angular orientations is disclosed. The user input may be a horizontal swipe across the touch-sensing device or a vertical swipe down a vertical centerline of the touch-sensing device. The plurality of touch sensors includes a first sensor, a second sensor, a third sensor, a fourth sensor, and a fifth sensor. The touch sensors are configured to detect, via at least three sensors, the user input for one or more angular orientations of a wireless earbud between 85 degrees Forward of an initial vertical position of the vertical centerline and 85 degrees rearward of the initial vertical position of the vertical centerline.