Projector Pixel Shift Actuator With Magnetic Feedback Sensing
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Solution Overview
Problem
Conventional projector driving devices for pixel shift have an open loop design, which prevents post-manufacturing monitoring and correction of image pixel displacement due to variations caused by component tolerances and environmental factors, affecting imaging quality.
Innovation Solution
An actuating device with a frame body driving assembly and sensing module that uses a magnetic element and sensor to indirectly monitor image pixel displacement, enabling closed-loop correction through magnetic field strength feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an open loop driving device is used for pixel shift, then the device complexity is reduced and manufacturing is easier, but image pixel displacement cannot be monitored or corrected after manufacturing due to component tolerances and environmental factors
Solution Approach 1:
The patent introduces a feedback mechanism by adding a sensing module that detects the position of the movable mirror through magnetic field sensing. The sensor detects changes in magnetic field strength caused by the movement of the magnetic element attached to the mirror, providing real-time position information back to the control system. This closed-loop feedback enables continuous monitoring and correction of pixel displacement, resolving the reliability issue while maintaining acceptable device complexity through efficient sensing.
Solution Approach 2:
The patent replaces complex mechanical position detection mechanisms with a magnetic field-based sensing system. Instead of using mechanical encoders or physical contact sensors, the invention uses a magnetic element and magnetic sensor to detect mirror position non-contactfully. This substitution reduces mechanical complexity and friction while improving reliability of position measurement for pixel shift correction.
2Measurement precision
If a sensing module is added to enable closed-loop control for monitoring pixel displacement, then image resolution and imaging quality are improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical position detection mechanisms with a magnetic field-based sensing system. Instead of using mechanical encoders or physical contact sensors, the invention uses a magnetic element and magnetic sensor to detect mirror position non-contactfully. This substitution reduces mechanical complexity and friction while improving reliability of position measurement for pixel shift correction.
Solution Approach 2:
The sensing module serves multiple functions: it detects mirror position for pixel shift monitoring, provides feedback for closed-loop control, and enables real-time compensation for environmental variations. By making the sensing system multi-functional, the patent achieves high measurement precision without proportionally increasing device complexity, as the same sensing infrastructure supports multiple control and monitoring tasks.
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
The actuating device optimizes pixel shift displacement by reducing errors and improving image resolution through closed-loop control, enhancing the projector's imaging quality.
Implementation Method 1
The frame body sensor is disposed adjacent to the first magnetic element to sense an amount of change in magnetic field strength of the first magnetic element
Implementation Method 2
The frame body driving assembly includes a first coil and a first magnetic element. The first magnetic element is disposed on one of the two first side walls of the frame body and is located between the first coil and the frame body
Data Source
AI summary
An actuating device include a base, a frame body, two first shaft portions, an optical element, a frame body driving assembly, and a frame body sensing module. The two first shaft portions extend along a first axis. Each first shaft portion is located between the frame body and the base. The optical element is disposed in an opening of the frame body. The frame body driving assembly drives the frame body to swing about the two first shaft portions as rotating axes and includes a first coil and a first magnetic element disposed on one of the two first side walls and is located between the first coil and the frame body. The frame body sensing module is connected to the base and includes a frame body sensor disposed adjacent to the first magnetic element to sense an amount of change in magnetic field strength of the first magnetic element.