Dual Color Wheel 3D Display for Stereoscopic Image Quality
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Solution Overview
Problem
Current stereoscopic display technologies face issues such as color cast, image quality problems, high costs, energy consumption, and unnecessary energy and brightness reductions due to limitations in existing methods like anaglyphic, polarization, and active shutter technologies, as well as inefficiencies in wavelength multiplexing systems.
Innovation Solution
A method and apparatus utilizing a first color wheel with primary-color filtering areas and a second color wheel with left or right eye filtering areas, where the wheels rotate to filter light beams into distinct spectra for each eye, allowing for efficient stereoscopic image display without the need for specific projection screens and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If anaglyphic 3D technology is used to distinguish left and right eye images, then the cost is reduced, but color cast occurs and image quality deteriorates
Solution Approach 1:
The patent segments the color wheel into multiple filtering areas, each responsible for specific wavelength ranges. The first color wheel provides primary color filtering (red, green, blue) while the second color wheel provides eye-specific filtering (left eye, right eye), dividing the filtering function into separate modular components that can be independently optimized
Solution Approach 2:
The patent uses composite filtering structures combining multiple filtering layers with different spectral characteristics. The first and second color wheels are positioned in sequence in the light path, creating a composite filtering system that achieves both primary color separation and eye-specific wavelength filtering simultaneously
2Object-generated harmful factors
If polarization 3D technology is used to distinguish left and right eye images, then image quality is improved, but special projection screen is required and polarization state may be lost
Solution Approach 1:
The patent replaces the polarization-based optical system with a wavelength multiplexing system using color wheels. Instead of relying on polarized light and special projection screens, the invention uses sequential wavelength filtering through rotating color wheels to distinguish between left and right eye images, eliminating the need for polarization-maintaining projection screens
Solution Approach 2:
The patent changes the distinguishing parameter from polarization state to wavelength/frequency. By using different wavelength ranges for left and right eye images (e.g., left eye: 450-500nm, right eye: 500-600nm), the system achieves eye separation without relying on polarization, which is more robust and does not require special projection screens
3Object-generated harmful factors
If active shutter 3D technology is used to block visual fields interlacedly, then stereoscopy is achieved, but expansive purchasing cost and extra energy consumption occur
Solution Approach 1:
The patent uses periodic rotation of color wheels to sequentially present different wavelength-filtered images to the left and right eyes. The first color wheel rotates to present primary color images, while the second color wheel rotates to present eye-specific wavelength-filtered images, creating a periodic temporal-multiplexed stereoscopic display that eliminates the need for expensive active shutter glasses
Solution Approach 2:
The patent merges the color filtering function and the eye-separation function into a single integrated optical path using two sequentially positioned color wheels. This combination allows the system to achieve both color reproduction and stereoscopy simultaneously without requiring separate active shutter components, reducing overall system complexity and cost
4Object-generated harmful factors
If traditional wavelength multiplexing stereoscopic system is used, then left and right eye images can be distinguished with wider color space, but unnecessary energy and brightness reductions occur
Solution Approach 1:
The patent introduces dynamic rotation of the color wheels to enable flexible temporal-multiplexed filtering. By rotating the first and second color wheels at controlled speeds and phases, the system can dynamically adjust which filtering areas are in the light path at any given moment, optimizing energy efficiency and brightness while maintaining wide color space for stereoscopic display
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 provides high-quality stereoscopic images with improved brightness and color saturation, reducing costs and energy usage compared to traditional methods, while avoiding image alignment issues and maintaining a compact design.
Implementation Method 1
a first color wheel with plural primary-color filtering areas (312'314'316)
Implementation Method 2
a second color wheel with plural left or right eye filtering areas (412'414'416'418'420'422)
Data Source
AI summary
A display includes a light source, a first color wheel, a second color wheel, an actuator, a controller, and a light modulator. The light source is for providing a light beam. The first color wheel includes plural primary-color filtering areas, and the second color wheel includes plural left or right eye filtering areas. The actuator rotates the first color wheel and the second color wheel. The controller is for controlling the rotations of the first color wheel and the second color wheel, such that the light beam passing through the first color wheel and the second color wheel is filtered to plural left or right eye primary-color light beams with different spectra. The light modulator is for modulating the left or right primary-color light beams and projecting the modulated left or right primary-color light beams onto a screen to display an image.