Smartwatch Rotation Command Accuracy via Direction-Specific Thresholds
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Solution Overview
Problem
Smartwatches face malfunctions due to inconsistent threshold angles for rotation commands, as the inward and outward rotation radii vary with the user's arm position, leading to incorrect command execution.
Innovation Solution
The smartwatch employs a control method that adjusts threshold angles based on the direction of rotation, using sensors like tilt and rotation speed to differentiate between inward and outward rotations, preventing malfunctions by setting distinct threshold angles for each direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same threshold angle is used for both inward and outward rotation directions, then the control method is simple, but the smartwatch may operate contrary to user intention due to different rotation radii
Solution Approach 1:
The patent divides the rotation detection into two separate segments: inward rotation and outward rotation. Each segment has its own threshold angle (first threshold angle for inward rotation, second threshold angle for outward rotation). This segmentation allows the system to account for the different rotation radii in each direction, preventing malfunction while maintaining clear and manageable control logic.
2Reliability
If different threshold angles are designated for inward and outward rotation directions, then command execution accuracy is improved, but the control method becomes more complex
Solution Approach 1:
The patent applies local quality by assigning different threshold angle values to different rotation directions. The first threshold angle is specifically optimized for inward rotation, while the second threshold angle is optimized for outward rotation. This direction-specific threshold assignment ensures accurate command recognition for each rotation direction without requiring complex overall system changes.
Solution Approach 2:
The patent implements dynamic adjustment of threshold angles based on the detected rotation direction. The control method dynamically selects which threshold angle to apply (first or second) depending on whether the rotation is inward or outward. This dynamic approach allows the system to adapt to the physical characteristics of wrist rotation in different directions, improving reliability while keeping the control logic manageable through clear directional detection.
Data Source
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AI summary
A smartwatch and a control method thereof are disclosed. According to an embodiment, the smartwatch includes a tilt sensor unit configured to sense a tilt of the smartwatch; a display unit configured to display an image; and a processor configured to control the tilt sensor unit and the display unit, wherein, when a front of the display unit is directed in a predetermined direction, the processor is further configured to : acquire, using the tilt sensor unit, a first rotation angle in a first direction when the smartwatch rotates in the first direction based on a rotation axis of the smartwatch and perform a first command corresponding to the first direction when the first rotation angle exceeds a first threshold angle, acquire, using the tilt sensor unit, a second rotation angle in a second direction when the smartwatch rotates in the second direction based on the rotation axis and perform a second command corresponding to the second direction when the second rotation angle exceeds a second threshold angle, and wherein the first direction is an opposite direction of the second direction and the first threshold angle is greater than the second threshold angle.