Wearable State Detection Using Motion-Gated IR Sensor Control
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently determining their wear state due to high current consumption by frequently operating infrared (IR) sensors, which can lead to reduced usage time and incorrect state recognition, such as mistaking a desk contact as a wear state.
Innovation Solution
An electronic device uses a first sensor with low current consumption to determine motion-related states and a second sensor with higher current consumption, activated only when specific motion types are detected, to accurately determine carry and wear states, minimizing unnecessary power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the IR sensor is operated frequently to recognize wear state in real time, then the state recognition accuracy is improved, but the current consumption increases significantly
Solution Approach 1:
The patent implements periodic operation of the IR sensor at different intervals based on device state. During carry state, the sensor operates at longer intervals to save power. During wear state, it operates more frequently for accurate detection. This periodic action with variable intervals resolves the contradiction by adapting measurement frequency to actual needs.
Solution Approach 2:
The patent segments the detection process into two stages: first using a motion sensor to detect motion patterns, then selectively activating the IR sensor only when motion is detected. This segmentation allows the system to maintain state recognition accuracy while significantly reducing overall current consumption by avoiding continuous IR sensor operation.
2Speed
If the operation period is set as short as possible to recognize wear state rapidly, then the response speed is improved, but the current consumption increases
Solution Approach 1:
The system uses periodic motion detection followed by conditional IR sensor activation. The motion sensor operates continuously at short intervals to detect motion rapidly, while the IR sensor is activated periodically only when motion is detected. This maintains fast response speed for wear state detection while avoiding continuous high-power IR sensor operation.
Solution Approach 2:
The motion sensor performs preliminary detection to identify potential wear events before activating the IR sensor. This preliminary action filters out unnecessary IR sensor activations, maintaining rapid response when wear occurs while significantly reducing overall current consumption during non-wear periods.
3Device complexity
If only the IR sensor is used to determine wear state, then the device complexity is reduced, but false recognition occurs when the rear side contacts objects
Solution Approach 1:
The patent segments the detection function across two sensor types: motion sensor for detecting motion patterns and IR sensor for confirming proximity. This segmentation allows the system to distinguish between accidental contact (no motion pattern) and actual wear (specific motion pattern detected), eliminating false recognition while maintaining manageable complexity through clear functional division.
Solution Approach 2:
The motion sensor acts as an intermediary that filters and pre-processes detection data before triggering the IR sensor. It mediates between the physical contact event and the final wear state determination, providing an additional verification layer that prevents false recognition while keeping the overall system complexity low through sequential processing.
Data Source
AI summary
A method of an electronic device is provided. The method includes obtaining first state information related to a motion of the electronic device by using a first sensor operatively coupled to the electronic device while the electronic device is in a first state, transitioning, if the first state information satisfies a first designated condition, the electronic device from the first state to a second state, obtaining second state information related to at least a part of a user's body corresponding to the electronic device by using a second sensor operatively coupled to the electronic device while the electronic device is in the second state, and transitioning, if the second state information satisfies a second designated condition, the electronic device from the second state to a third state.