Dual Screen Angle Measurement via Virtual Sensor Fusion
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Solution Overview
Problem
Existing methods for determining the relative positions of dual screens in flip phones, such as using Hall devices or acceleration sensors, are inaccurate and fail to account for motion, leading to poor user experience.
Innovation Solution
Employing a method that combines data from acceleration sensors, gyroscopes, and geomagnetic sensors to simulate a virtual sensor, allowing for accurate measurement of the included angle between two screens, thereby enabling precise control of display content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall device is arranged close to the rotation shaft to improve sensitivity, then the Hall device becomes too sensitive, but if arranged far away, it fails to respond in time
Solution Approach 1:
The patent combines multiple sensors (acceleration sensor, gyroscope, geomagnetic sensor) into an integrated sensing system. This merging allows the system to compensate for the limitations of individual sensors by using their complementary strengths, achieving both high sensitivity and accurate response timing without the need to precisely position a single Hall device near the rotation shaft.
Solution Approach 2:
The patent changes the sensing parameters by using different types of sensors that measure different physical quantities (acceleration, angular velocity, magnetic field). This parameter diversification allows the system to determine screen relative positions through multiple measurement approaches, resolving the contradiction between sensitivity and response timing that plagues single-point Hall device arrangements.
2Device complexity
If a Hall device is used to determine relative positions, then the system is simple, but it can only report two states (closed and open) and cannot obtain accurate relative positions
Solution Approach 1:
The patent merges data from multiple sensor types to create a comprehensive positioning system. By combining acceleration sensor data, gyroscope data, and geomagnetic sensor data, the system achieves continuous and accurate measurement of screen relative positions while maintaining reasonable system complexity through integrated processing.
Solution Approach 2:
The patent makes the sensing system multi-functional by using sensors that can detect both the state (open/closed) and the precise angular position simultaneously. The acceleration sensor, gyroscope, and geomagnetic sensor collectively provide universal positioning capability that covers both simple state detection and precise angle measurement.
3Ease of manufacture
If an acceleration sensor is used to calculate the included angle, then the method is simple to implement, but the data includes motion acceleration which makes the calculated angle inaccurate
Solution Approach 1:
The patent combines acceleration sensor data with gyroscope and geomagnetic sensor data to compensate for the motion acceleration interference. The gyroscope provides angular velocity information that can be integrated to get angle, while the geomagnetic sensor provides absolute orientation reference, together correcting the errors introduced by motion acceleration in the acceleration sensor measurements.
Solution Approach 2:
The patent implements feedback mechanisms where the data from multiple sensors is continuously processed and compared. The system uses the combined information to correct and refine angle calculations in real-time, compensating for motion-induced errors through feedback from the gyroscope and geomagnetic sensor that provide more stable reference measurements.
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 approach provides accurate measurement of the included angle between dual screens, enhancing user experience by allowing for appropriate display configurations and preventing mistaken touches.
Implementation Method 1
the data obtained by the measurement of the acceleration sensor consists of the gravitational acceleration and a motion acceleration of the terminal
Implementation Method 2
the at least two types of sensors are selected from an acceleration sensor, a gyroscope, and a geomagnetic sensor
Implementation Method 3
the at least two types of sensors are selected from an acceleration sensor, a gyroscope, and a geomagnetic sensor
Data Source
AI summary
Disclosed is a method for determining relative positions of dual screens, suitable for a dual-screen foldable terminal in which two screens of the terminal are provided with at least two types of sensors, respectively. The method includes: collecting data of each sensor on the two screens, respectively; simulating data of a target virtual sensor according to the data collected on each screen; and determining an included angle between the two screens according to the data of the target virtual sensor corresponding to the two screens. Further disclosed are a display control method and a dual-screen foldable terminal. By means of the present disclosure, an included angle between the two screens can be accurately measured so as to control the display.