Phosphor Wheel Calibration via Laser Timing Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for calibrating the relative rotation angle between phosphor and light filter wheels in projectors are time-consuming and prone to individual variability due to manual adjustment, leading to inconsistent results.
Innovation Solution
An illumination system and projection device that utilize a laser light source, phosphor wheel with labeled color regions, and detection modules to automatically adjust the rotation speed of the phosphor wheel based on displacement values calculated from laser beam timing information, enabling precise calibration without projecting an image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment method is used for calibrating phosphor wheel and light filter wheel, then personnel can visually observe and adjust color gradation smoothness, but the calibration process becomes time-consuming and results in inconsistent standards due to individual differences
Solution Approach 1:
The patent replaces the manual mechanical adjustment system with an automated optical detection and control system. A detection module captures images of the color gradation image, and a processor automatically analyzes the images to determine color transition regions and calculate rotation angle offsets, eliminating the need for manual visual observation and adjustment while improving consistency and reducing time
Solution Approach 2:
The calibration system performs self-calibration by automatically detecting color transitions, calculating displacement values, and adjusting rotation angles without requiring external personnel intervention. The system uses its own detection and processing capabilities to achieve precise calibration independently
2Reliability
If manual adjustment method is used for calibrating phosphor wheel and light filter wheel, then personnel can visually observe color gradation smoothness, but individual differences lead to different calibration standards
Solution Approach 1:
The patent replaces subjective human visual assessment with objective optical detection and computational analysis. The detection module captures precise color information, and the processor applies consistent algorithms to determine color transition regions and calculate rotation angle offsets, ensuring uniform calibration standards across all devices while managing system complexity through automated processing
Solution Approach 2:
The system implements feedback by capturing images during calibration, analyzing color transition regions, calculating displacement values, and using this information to adjust rotation angles. This closed-loop feedback mechanism ensures consistent and reliable calibration standards by continuously monitoring and adjusting based on actual color gradation performance
3Productivity
If automatic calibration method using detection module and processor is used, then calibration speed increases and consistency improves, but the device complexity increases
Solution Approach 1:
The detection module and processor are designed to perform multiple functions: capturing images during calibration, analyzing color transition regions, calculating rotation angle offsets, and controlling wheel adjustments. This multi-functionality increases productivity while managing complexity by consolidating calibration tasks into integrated components that can be reused across different calibration scenarios
Solution Approach 2:
The patent replaces complex manual calibration procedures with automated optical detection and computational processing. While this increases device complexity by adding detection modules and processors, it dramatically improves productivity by eliminating time-consuming manual operations and enabling rapid, consistent calibration across multiple devices
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 method achieves rapid and consistent calibration with good optical quality, reducing calibration time and eliminating human error, thereby improving the efficiency and accuracy of the calibration process.
Implementation Method 1
a phosphor wheel (120), which has a first color region (CR1) and a second color region (CR2)... during the period in which the first color region is cut into the optical path of the laser beam, the laser beam passes through the first color region and is sensed with first laser beam timing information
Implementation Method 2
The first light detection module (130) is disposed beside the phosphor wheel (120) and is configured to emit the first detection beam... the first light detection module (130) acquires the position of the first label (M1) according to the first detection beam (DB1)
Data Source
AI summary
An illumination system including a laser light source, a phosphor wheel, a first light detection module, a first light sensing device, and a controller is provided. A first color region boundary is formed between the first and second color regions of the phosphor wheel. The first light sensing component is located downstream of the optical path of the phosphor wheel. During the period in which the first color region is cut into the optical path of the laser beam, the laser beam passes through the first color region and is sensed with first laser beam timing information by the first light sensing component. The controller determines a first displacement value between the first label and the first color region boundary according to the first laser beam timing information and the reference color timing information. A projection device and a color wheel calibrating method are also provided.