Optical Device Pixel Shift Control Using Single Sensor
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Solution Overview
Problem
Existing projector technologies that shift video light in both vertical and horizontal directions to increase pixel density face issues with increased circuit complexity and structural complications due to the need for multiple position sensors and servo control, leading to potential errors in pixel shift accuracy.
Innovation Solution
An optical device with a movable section, supported by a holder, and actuators that rotate around intersecting axes, utilizing a single sensor to detect the optical section's position and adjust drive signals to achieve precise pixel shift without the need for multiple sensors, thereby simplifying the circuit and structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple position sensors and servo control are used to detect and correct optical section position, then measurement precision and reliability improve, but device complexity and circuit scale increase
Solution Approach 1:
The patent combines the position detection function into a single sensor that detects the position of the optical section in both vertical and horizontal directions simultaneously, rather than using separate sensors for each axis. This merging approach maintains measurement precision while reducing device complexity and circuit scale.
Solution Approach 2:
The single sensor is designed to perform multiple detection functions - it can detect the position of the optical section along both the first axis (vertical) and second axis (horizontal) through which the light beam passes. This multi-functionality eliminates the need for multiple dedicated sensors, reducing overall device complexity.
2Measurement precision
If two position sensors are used to monitor optical section position on first and second axes, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the functionality of two separate position sensors into a single sensor that can detect positional deviations of the optical section in both vertical and horizontal directions. This single sensor is positioned to detect the light beam's position as it passes through the optical section, providing comprehensive monitoring without requiring multiple sensor components.
Solution Approach 2:
The patent uses the light beam itself as an intermediary to transfer position information from the optical section to the single sensor. The light beam carries positional data as it passes through the optical section, allowing the sensor to infer the optical section's position without direct mechanical contact or multiple sensing points.
3Reliability
If servo control is implemented based on multiple sensor inputs, then reliability of pixel shift control improves, but device complexity increases
Solution Approach 1:
The control system merges the detection outputs for both vertical and horizontal positions into a single sensor signal processing path. The single sensor provides unified position feedback that is processed by the control unit to generate appropriate correction signals for the actuators, simplifying the control architecture while maintaining reliability.
Solution Approach 2:
The patent implements a feedback control mechanism where the single sensor continuously monitors the optical section position and feeds this information back to the control unit. The control unit compares the detected position with the target position and adjusts the actuator drive signals accordingly, ensuring reliable pixel shift control through closed-loop feedback without complex multi-sensor processing.
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 detection and control of pixel shift, enhancing image resolution to 4K without increasing the circuit scale or structural complexity, ensuring precise image projection.
Implementation Method 1
an optical section that has a light incident surface on which video light is incident, deflects the video light in accordance with an angle of incidence of the video light incident on the light incident surface, and outputs the deflected video light
Implementation Method 2
a sensor that detects a position of the optical section
Data Source
AI summary
An optical device includes a movable section including an optical section that deflects video light in accordance with the angle of incidence of the video light incident on a light incident surface and outputs the deflected video light and a holder that supports the optical section, an actuator that rotates the movable section around a first axis, an actuator that rotates the movable section around a second axis, a drive circuit that supplies the actuator with a first drive signal and the actuator with a second drive signal, and a sensor disposed in a position different from the positions on the first and second axes detects the position of the optical section, and the drive circuit adjusts the first and second drive signals in accordance with the position of the optical section detected with the sensor.