Projector Color Space Separation for Stereoscopic 3D
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Solution Overview
Problem
Conventional methods for projecting two images simultaneously on a surface, such as stereoscopic 3D projection, face issues like light loss, the need for specialized screens, and viewer alignment due to polarization requirements, and lack efficiency in image separation for multiple observers.
Innovation Solution
A method and projector system that generate two illumination beams with distinct properties, allowing each image to be recognizable only to the observer wearing appropriate filter spectacles, using different color spaces or polarizations, enabling simultaneous display on the same projection surface without the need for polarized screens or precise viewer alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarization filter technology is used for channel separation, then stereoscopic 3D projection is achieved, but light loss occurs and metallic projection screens are required
Solution Approach 1:
The patent changes the parameter of light separation from polarization-based to color space-based. By using spectrally independent color spaces (e.g., red-green-blue for one eye, yellow-cyan-magenta for the other), the system avoids polarization filters and metallic screens, thereby eliminating light loss while maintaining stereoscopic 3D projection reliability
Solution Approach 2:
The invention extracts the polarization filters and metallic projection screens from the system by replacing them with color filter-based channel separation. This removal eliminates the harmful light loss effect while preserving the core stereoscopic function through spectral decomposition
2Reliability
If linearly polarized light is used, then channel separation is achieved, but head alignment is required to maintain 90° angle between filters
Solution Approach 1:
The patent changes the parameter of light separation from polarization angle-dependent to color space-based. By using spectrally independent color spaces with non-overlapping wavelength ranges, the system eliminates the need for precise head alignment while maintaining reliable channel separation, as color filters inherently provide spectral discrimination independent of viewing angle
Solution Approach 2:
The invention replaces complex polarization-maintaining metallic screens with simple color filter spectacles that are easier to manufacture and use. These color-based filters provide robust channel separation without requiring precise orientation, making the system more accessible and easier to operate
3Ease of operation
If circularly polarized light is used, then head alignment is not required, but polarization spectacles and filters are still needed
Solution Approach 1:
The patent changes the fundamental parameter of light separation from polarization state to color space spectrum. By using spectrally independent color spaces, the system eliminates polarization spectacles and filters entirely, replacing them with simpler color-based filter glasses that achieve channel separation through wavelength discrimination rather than polarization manipulation
Solution Approach 2:
The invention extracts and removes polarization filters from the optical path by using color filter-based channel separation. This eliminates the need for polarization-maintaining screens and complex polarization spectacles, simplifying the overall system while maintaining head alignment freedom
4Productivity
If two projectors are used for simultaneous projection, then two images are displayed, but device complexity increases
Solution Approach 1:
The patent segments the light spectrum into spectrally independent color spaces and assigns different images to different color spaces. By using a single projector with spectral decomposition and color filter spectacles for channel separation, the system achieves simultaneous projection of two images while reducing device complexity from two projectors to one
Solution Approach 2:
The invention merges the functions of two projectors into a single projector by using spectral decomposition and color space separation. The single projector displays both images simultaneously in different color spaces, and color filter spectacles separate the channels at the viewer's eye, eliminating the need for dual projector hardware
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
Enables efficient and cost-effective simultaneous projection of different images to multiple observers on a single surface, using shared optics and allowing for compact, portable designs, while maintaining clear color impressions without the need for polarized screens.
Implementation Method 1
The first illumination beam has electromagnetic radiation having a predefined first property and the second illumination beam has electromagnetic radiation having a predefined second property, which differs from the first property
Data Source
AI summary
A method for simultaneously projecting two images onto a projection surface may include generating a first and second illumination beam based on first and second image data, which are representative of a first and second image, wherein the first illumination beam has electromagnetic radiation having a first property, wherein the second illumination beam has electromagnetic radiation having a second property, which differs from the first property, and deflecting the first and second illumination beams toward the projection surface so that the first illumination and second beam generates a first and second beam spot on the projection surface, respectively, wherein the first and second beam spot is moved over the projection surface so that with the aid of the first and second beam spot, the first and second image are displayed for a first and second observer on the surface, respectively, and the second image is superimposed on the first image.