Color Wheel Segment Correction for 3D Projector Color Deviation
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Solution Overview
Problem
3D projectors using digital light processing face challenges in maintaining image quality due to color deviation during active 3D projection, which affects the realism and naturalness of the 3D visual experience.
Innovation Solution
A method is introduced where the color wheel's segment ranges are measured for color temperature, and the segment closest to a standard color temperature is identified and used for correction, with energy waveforms adjusted to mitigate color deviation and improve brightness, specifically by covering and uncovering segments based on the rotation frequency and switching time of 3D glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a color wheel is used to filter different colors in a DLP projector, then color separation is achieved, but color deviation occurs during active 3D projection
Solution Approach 1:
The color wheel is divided into multiple segment ranges (e.g., red, yellow, green, cyan, blue segments), and each segment is independently controlled and measured. This segmentation allows precise control over which color segments are active during different phases of 3D projection, enabling correction of color deviation by adjusting individual segment characteristics
Solution Approach 2:
The patent measures color temperature for each segment range and compares it against standard color temperature values. By changing the energy waveform parameters of specific segments based on their measured color temperatures, the system corrects color deviation. The energy waveform adjustment modifies the spectral output of each segment to achieve standard color temperature reproduction
2Adaptability or versatility
If the color wheel rotates to provide different colors sequentially, then color diversity is achieved, but color temperature varies and deviates from standard
Solution Approach 1:
The system measures the actual color temperature for each segment range during rotation and uses this feedback to determine corrections. The measured color temperature is compared with standard values, and the difference is used to adjust the energy waveform of each segment, creating a closed-loop control system that maintains color temperature consistency throughout the rotation cycle
Solution Approach 2:
The patent dynamically adjusts the energy waveform of each color segment based on real-time measurements and standard comparisons. The energy waveform parameters are changed adaptively during the color wheel rotation, allowing the system to maintain accurate color temperature across all segments while preserving color diversity through the rotating color wheel
3Productivity
If segment ranges are covered and uncovered based on rotation frequency and switching time, then 3D projection synchronization is achieved, but color deviation increases
Solution Approach 1:
The system performs preliminary measurements of color temperature for each segment range before actual 3D projection occurs. These pre-measured values are stored and used to calculate appropriate energy waveform adjustments in advance, ensuring that when segments are covered and uncovered during synchronized 3D projection, the color temperature remains accurate without deviation
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 approach effectively reduces color deviation and enhances image quality by aligning the color temperature with a standard, such as sunlight color temperature, and adjusts energy distribution to improve brightness and color performance during 3D projection.
Implementation Method 1
a white light bulb (a high pressure mercury lamp) is used in collaboration with a color wheel to filter different colors
Implementation Method 2
a digital micromirror device (DMD) is used to reflect the color complied with the image to a screen for imaging
Implementation Method 3
A material of the shutter 3D glasses is mainly liquid crystal, and the lenses thereof are two small windows capable of being opened and closed under control
Data Source
Figure 1~2A
Figure 2B~3
AI summary
A method for adjusting color, suitable for a three dimension (3D) projector, is provided. In the present invention, a plurality of segment ranges of a color wheel is covered one by one, and it is measured a color temperature corresponding to the color wheel after each of the segment ranges is covered. Then, each of the color temperatures is compared with a standard color temperature for choosing one of the color temperatures closest to the standard color temperature. And the segment range corresponding to the color temperatures closest to the standard color temperature is regarded as a correctional covering segment.