Color Wheel Phase Correction Using Temperature Compensation
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Solution Overview
Problem
The DLP system experiences color errors due to temperature changes affecting the CWIM sensing signal, leading to inaccuracies in the rotating speed and phase of the color wheel.
Innovation Solution
Incorporating a temperature sensor to compensate for temperature-induced changes in the CWIM sensing signal, setting the leading edge of the CWIM sensing signal as a reference location and adjusting the phase difference between the CWIM sensing signal and the synchronization signal to maintain accurate color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the CWIM sensing signal is used as a reference for color wheel rotation without temperature compensation, then the system operation is simple, but color accuracy deteriorates due to temperature-induced signal variations
Solution Approach 1:
The patent applies parameter changes by introducing temperature compensation to adjust the CWIM sensing signal based on temperature variations. A temperature sensor detects temperature changes, and a compensation value is added to the CWIM signal to offset temperature-induced phase errors, thereby maintaining color accuracy without requiring complex hardware redesign
Solution Approach 2:
The patent uses an intermediary approach by introducing a temperature sensor and compensation mechanism as a mediator between the CWIM sensing signal and the color wheel control. This intermediary compensates for temperature effects on the sensing signal, allowing accurate color reproduction while maintaining relatively simple system architecture
2Measurement precision
If the CWIM sensing signal is directly used without temperature compensation, then the device structure is simple, but color reproduction accuracy deteriorates
Solution Approach 1:
The patent changes the parameter of the CWIM sensing signal by adding a temperature compensation value. The compensation value is calculated based on temperature sensor readings and is added to the original CWIM signal to correct phase detection errors caused by temperature variations, thereby improving phase detection accuracy while keeping the control system relatively simple
3Reliability
If temperature compensation is implemented, then color error is reduced, but device complexity increases
Solution Approach 1:
The patent implements feedback by using a temperature sensor to continuously monitor temperature changes and feeding this information back to adjust the CWIM sensing signal. The compensation value is dynamically updated based on temperature readings, ensuring consistent color reproduction while maintaining a relatively simple feedback loop structure
Solution Approach 2:
The patent changes the parameter of the control signal by adding temperature-dependent compensation values. This parameter change approach allows the system to adapt to temperature variations and maintain color consistency without requiring complex control algorithms or additional hardware components
Data Source
AI summary
An apparatus and method for correcting a color error are provided. The apparatus includes, a color wheel having a CWIM marked thereon, a motor for rotating the color wheel, a motor driver for controlling a driving of the motor, a CWIM sensor for sensing the CWIM to generate a CWIM sensing signal, and a controller for setting a leading edge of the CWIM sensing signal as a reference location and controlling the motor driver to adjust a phase difference between the CWIM sensing signal and a synchronization signal of an image signal.