Wearable Digital Compass Mode Switching for Accuracy and Battery Life
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Solution Overview
Problem
Wearable electronic devices face challenges in providing accurate bearing angle information while optimizing power consumption, especially when varying user movements and static states.
Innovation Solution
The electronic device employs a 9-axis sensor system with variable performance modes for the digital compass, adjusting power consumption based on user interactions and device states, and dynamically changing modes to reduce current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device processes data from all 9-axis sensors at a fast sampling rate to provide accurate bearing angle information, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the sensor performance mode adjustable based on device state. The processor dynamically switches between first performance mode (high sampling rate for accuracy) and second performance mode (low sampling rate for power saving) according to whether the device is moving or static, resolving the contradiction between measurement precision and power consumption
Solution Approach 2:
The patent changes the sampling rate parameter of the sensors based on device state. When the device is static, it reduces the sampling rate from the first sampling rate to the second sampling rate, thereby reducing power consumption while maintaining adequate bearing angle information accuracy
2Loss of information
If the electronic device permanently provides compass information in the first running mode, then information availability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by providing compass information continuously in the first running mode rather than only on demand. This ensures information availability while allowing the system to periodically switch to power-saving mode when the device is static and compass information is less critical
3Measurement precision
If the electronic device uses a first performance mode for the digital compass, then measurement precision is improved, but current consumption increases
Solution Approach 1:
The patent makes the performance mode dynamic by switching between first performance mode (high precision, high current) and second performance mode (lower precision, low current) based on device motion state. This resolves the contradiction by adapting precision to actual usage needs
Solution Approach 2:
The patent changes the sampling rate parameter from first sampling rate to second sampling rate when transitioning from first performance mode to second performance mode, thereby reducing current consumption while maintaining adequate compass information accuracy for static device states
Data Source
AI summary
An electronic device includes sensors, a display, and a processor electrically connected to the sensors and the display, in which the electronic device is in a first running mode for permanently providing compass information or a second running mode for providing the compass information, in response to a request from a user. When set to be in the first running mode, the processor a performance mode of a digital compass to be a first performance mode, determines first performance mode-based compass information using the sensors, and displays the determined first performance mode-based compass information on the display. When set to be in the second running mode, the processor sets the performance mode of the digital compass to be a second performance mode, determines second performance mode-based compass information using the sensors at the request from the user, and displays the determined second performance mode-based compass information on the display.