POV Display Rotation Control for Stable Speed-Phase Synchronization
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Solution Overview
Problem
Existing rotatable display devices face challenges in accurately measuring and controlling the speed and phase of the rotating module, leading to instability in image synchronization and smooth image representation.
Innovation Solution
The implementation of a rotatable display device with a dual-sensor system, including a first sensor on the rotating frame and a second sensor on the fixed frame, along with a motor controller that uses PID control to maintain constant speed and phase, ensuring precise control of the motor's rotational speed and phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor system is used to measure rotational speed and phase, then the device complexity is reduced, but the measurement precision and control accuracy deteriorate
Solution Approach 1:
The sensor system is segmented into two independent sensors: a first sensor for measuring rotational speed and a second sensor for measuring phase. This segmentation allows each sensor to be optimized for its specific measurement function, improving overall measurement precision while maintaining manageable system complexity through modular design.
Solution Approach 2:
The measurement system transitions from a single-dimension approach to a two-dimension approach by adding both temporal and spatial dimensions. The first sensor measures speed over time, while the second sensor measures phase position in space, creating a comprehensive two-dimensional measurement framework that enhances control accuracy.
2Stability of the object's composition
If the rotation period is not synchronized with the image output period, then the mechanical stress on the motor is reduced, but the stability of image synchronization deteriorates
Solution Approach 1:
A feedback control mechanism is implemented where the measured rotational speed and phase are continuously monitored and compared against target values. The motor controller adjusts the motor operation in real-time based on this feedback, maintaining precise synchronization between rotation period and image output period while minimizing mechanical stress through smooth control adjustments.
Solution Approach 2:
The system dynamically adjusts motor operation to maintain synchronization. Rather than using fixed mechanical constraints that would create stress, the motor speed and phase are dynamically controlled based on real-time measurements, allowing the system to adapt to varying conditions while maintaining stable image synchronization.
3Ease of operation
If the motor speed and phase are not precisely controlled, then the ease of operation is improved, but the smoothness of image representation deteriorates
Solution Approach 1:
The motor controller uses feedback from both sensors to automatically adjust motor speed and phase, eliminating the need for manual precision control. This feedback mechanism maintains smooth image representation by continuously correcting deviations, making the system easy to operate while ensuring high-quality image output.
Solution Approach 2:
The control system is self-regulating, using its own measurement capabilities to automatically maintain optimal performance. The dual-sensor system and motor controller work together to self-correct speed and phase deviations, ensuring smooth image representation without requiring external intervention or complex manual control.
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 solution allows for accurate sensing and control of the rotating module's speed and phase, enhancing image stability and smoothness by synchronizing the rotation period with the image output period, thereby improving the overall display performance.
Implementation Method 1
the first sensor may include a first light receiver for receiving light irradiated from a light emitter disposed on the fixed frame
Implementation Method 2
the second sensor may include a third light receiver for receiving light reflected by the reflector
Implementation Method 3
the second sensor may be a hall sensor for sensing a magnetic field of a magnetic body disposed in the rotating frame
Implementation Method 4
a motor disposed on the fixed frame and rotationally driving the rotating frame
Data Source
AI summary
The present invention relates to a rotary type display device comprising a fixed module and a rotation module, wherein the rotation module comprises: a rotating body frame; a light source module; a first sensor for sensing a rotational speed and a phase of the rotation module; and an image output control unit for controlling an image output using the light source module, by using a first sensing value obtained through the first sensor, and the fixed module comprises: a fixed body frame; a motor for rotating the rotating body frame; a second sensor for sensing the rotational speed and the phase of the rotation module; and a motor control unit for controlling at least one of the rotational speed and phase of the motor by using a second sensing value obtained through the second sensor.