Accelerometer Shift Angle for Rotation Detection
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Solution Overview
Problem
Conventional portable electronic devices are unable to correctly detect rotation angles when the display surface is parallel to the horizontal plane, limiting their ability to change the display direction according to user operation.
Innovation Solution
The solution involves a portable electronic device with a display device, an acceleration sensor, and a processing unit, where the acceleration sensor's detection direction is adjusted by forming a shift angle smaller than 90 degrees with the display surface, allowing the processing unit to calculate and correct the tilt angle, enabling effective rotation direction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acceleration sensor's detection axes are aligned with the device's dimensional axes, then the device structure is simple, but the device cannot detect rotation angles when the display surface is parallel to the horizontal plane
Solution Approach 1:
The patent changes the orientation parameter of the acceleration sensor by introducing a shift angle between the sensor's detection axes and the device's dimensional axes. This parameter change enables the sensor to detect rotation angles accurately even when the display surface is parallel to the horizontal plane, resolving the detection failure issue while maintaining structural simplicity.
Solution Approach 2:
The patent introduces an intermediary calculation process that involves correcting the raw tilt angle detected by the acceleration sensor using the shift angle. This intermediary correction step bridges the gap between the sensor's fixed orientation and the dynamic rotation detection requirement, enabling accurate rotation angle measurement across all display orientations.
2Adaptability or versatility
If the acceleration sensor detects three-dimensional acceleration with fixed orientation, then the sensor configuration is simple, but the display direction cannot change according to user rotation operation
Solution Approach 1:
The patent makes the system dynamic by introducing a correctable tilt angle that adapts to the display's rotational state. The processing unit dynamically calculates the corrected tilt angle based on the shift angle, enabling the system to adapt to different display orientations and maintain accurate rotation detection throughout the entire rotation range.
Solution Approach 2:
The patent implements a feedback mechanism where the processing unit continuously monitors the acceleration sensor data, calculates the tilt angle, applies the shift angle correction, and uses the corrected tilt angle to determine rotation direction. This feedback loop ensures accurate rotation detection and display direction adaptation across all orientations.
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 configuration allows the device to detect and adapt to rotation directions at ±90 degrees tilt angles, enhancing user experience by enabling display direction changes based on user operation, even when the device is placed on a table or used in a lying position.
Implementation Method 1
the acceleration sensor is configured to detect a three-dimensional acceleration
Data Source
AI summary
A portable electronic device including a display device, an acceleration sensor and a processing unit is provided. The display device has a display surface. The acceleration sensor has a plurality of detecting sensor arrays for detecting a three-dimensional acceleration, and a shift angle smaller than 90 degrees is formed between at least one of the detecting sensor arrays and the display surface. The processing unit is configured to calculate a tilt angle according to the three-dimensional acceleration.