Projector Optical Shift Actuator Feedback for Vibration Control
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Solution Overview
Problem
Conventional projector driving devices for pixel shift actuators are open-loop, leading to uncalibrated image pixel displacement due to electronic and mechanical tolerances, causing excessive vibration and noise from collisions with surrounding components.
Innovation Solution
A closed-loop system with a driving device that includes a sensor, driving waveform signal generator, and control element to dynamically adjust the driving waveform based on position feedback, ensuring the maximum amplitude in the initial period is less than or equal to that in the stable period, stabilizing the optical path shift element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an open-loop driving device is used with fixed calibration, then the device complexity is reduced, but the manufacturing precision and reliability deteriorate due to uncorrected tolerances and environmental factors
Solution Approach 1:
The patent implements a closed-loop control system where a sensor detects the actual position of the optical path shift element and feeds back position information to a control element. The control element compares the actual position with the target position and dynamically adjusts the driving waveform signal to compensate for deviations caused by tolerances and environmental factors, thereby maintaining high manufacturing precision without excessive system complexity
Solution Approach 2:
The patent dynamically changes the parameters of the driving waveform signal (amplitude, frequency, phase) based on real-time position feedback. The control element adjusts these parameters to optimize the actuator's response and maintain precise positioning, resolving the contradiction between simple fixed calibration and adaptive precision control
2Speed
If the driving waveform signal has high amplitude to ensure fast response, then the speed is improved, but harmful factors increase due to excessive vibration and mechanical collisions
Solution Approach 1:
The patent employs dynamic control of the driving waveform signal amplitude based on the operational phase. During the initial period, the amplitude is limited to prevent excessive vibration and mechanical collisions. During the stable period, the amplitude can be increased to achieve faster response. This dynamic adjustment resolves the contradiction between speed and harmful vibrations
Solution Approach 2:
The patent divides the driving cycle into distinct periods (initial period and stable period) with different amplitude characteristics. This periodic variation in driving signal parameters allows the system to balance between preventing mechanical collisions during startup and achieving fast response during stable operation
3Reliability
If real-time monitoring and adjustment are implemented, then the reliability and manufacturing precision are improved, but the device complexity increases due to additional sensors and control elements
Solution Approach 1:
The patent uses a sensor to provide real-time position feedback to a control element, enabling dynamic adjustment of the driving waveform signal. This feedback mechanism ensures high reliability and positioning accuracy while keeping the additional components minimal and integrated into the existing actuator structure
Solution Approach 2:
The control element automatically adjusts the driving signal based on position feedback without requiring external intervention or complex calibration procedures. The system self-corrects for tolerances and environmental variations, maintaining high reliability without proportionally increasing device complexity
Data Source
AI summary
A driving device and a driving method are provided. The driving device includes a driving waveform signal generator and a control element. The driving waveform signal generator is configured to provide a driving waveform signal to an optical actuator according to waveform information provided by the control element. The control element is configured to generate updated waveform information based on a synchronization signal and the position information received from the sensor. The driving waveform signal generator provides an updated driving waveform signal to the optical actuator according to the updated waveform information, so that a maximum amplitude value of the driving waveform signal in an initial period is less than or equal to a maximum amplitude value of the driving waveform signal in a stable period.