Laser Projector Phase Calibration via Light Intensity Feedback
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Solution Overview
Problem
Conventional phase calibration methods for laser projectors are labor-intensive and time-consuming, requiring manual adjustments and additional equipment, which limits precision and increases costs.
Innovation Solution
A phase calibration method using a processor to transmit synchronization signals to a laser driver, controlling light source switches and measuring light intensities through a phosphor wheel and color wheel, iteratively adjusting phases to maximize light intensity integration, eliminating the need for external light sensors and manual waveform observation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual phase adjustment and oscilloscope observation are used, then phase calibration can be performed, but labor and time consumption increase significantly
Solution Approach 1:
The system uses its own light sensor to automatically measure and evaluate phase calibration results, eliminating the need for external oscilloscope observation and manual adjustment. The processor automatically analyzes the waveform and determines optimal phases, making the system self-calibrating and significantly reducing labor and time consumption.
Solution Approach 2:
The light sensor provides real-time feedback on the waveform characteristics during phase adjustment. The processor uses this feedback to automatically determine when optimal phase alignment is achieved, replacing manual oscilloscope observation with automated feedback-based decision making.
2Measurement precision
If external light sensor and oscilloscope are used, then phase calibration can be performed, but device complexity and cost increase
Solution Approach 1:
The light sensor already present in the projector for normal operation is made multi-functional by using it also for phase calibration measurements. This eliminates the need for separate external light sensors and oscilloscopes, reducing device complexity and cost while maintaining calibration precision.
Solution Approach 2:
The projector uses its own built-in light sensor to perform self-diagnosis and self-calibration of the phosphor wheel and color wheel phases, eliminating dependence on external calibration equipment and reducing overall system complexity.
3Reliability
If waveform-based manual determination is used, then phase optimization can be achieved, but measurement precision is limited
Solution Approach 1:
The system implements automated feedback-based phase optimization where the light sensor continuously monitors waveform characteristics and the processor automatically adjusts phases to maximize synchronization. This replaces imprecise manual waveform observation with precise automated measurement and control.
Solution Approach 2:
The manual mechanical adjustment process is replaced with automated electronic control. The processor electronically controls the phase adjustment based on precise light sensor measurements, eliminating the imprecision of manual observation and adjustment.
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 reduces labor and time costs, improves precision, and automates the phase calibration process, optimizing the phases of the phosphor wheel and color wheel for enhanced performance.
Implementation Method 1
measuring, by a light sensor, a first light intensity of a laser light of the laser light source having sequentially passed through a phosphor wheel and a color wheel
Data Source
AI summary
A phase calibration method includes: producing a synchronization signal; controlling switches of a light source based on a time series; measuring a first light intensity of the light passing through a phosphor wheel and a color wheel; changing phases of the phosphor wheel or the color wheel; measuring a second light intensity of the light passing through the phosphor wheel and the color wheel; changing the phases of the phosphor wheel or the color wheel again; measuring a third light intensity of the light passing through the phosphor wheel and the color wheel; repeating changing the phases if the second light intensity is greater than the first light intensity, and the third light intensity is greater than the second light intensity; or when the second light intensity is smaller than the first light intensity, and the third light intensity is greater than the first light intensity.