Projection System Enclosure Absorbs Scattered Light for High Contrast
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Solution Overview
Problem
Stereo image projection systems fail to maintain high ANSI contrast levels, despite advancements in projector technology, due to intra-frame contrast degradation caused by polarization modulators, which reduces the overall image quality.
Innovation Solution
A projection system design that positions a stereo polarization modulator internally, between a spatial light modulator and imaging optics, and includes an enclosure between the port window and projection lens to absorb scattered light, thereby reducing stray light and maintaining high intra-frame contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polarization modulator is used for stereo image projection, then stereo image capability is achieved, but intra-frame contrast deteriorates due to scattered light
Solution Approach 1:
The patent extracts and removes scattered light from the optical path using an enclosure structure with light-absorbing materials. The enclosure is positioned between the port window and projection lens to capture and absorb stray light before it reaches the screen, thereby preserving intra-frame contrast while maintaining stereo image capability through the polarization modulator.
Solution Approach 2:
The patent introduces an enclosure as an intermediary element between the polarization modulator and the projection lens. This enclosure acts as a mediator that absorbs scattered light without interfering with the primary optical path, allowing the polarization modulator to function while preventing contrast degradation.
2Device complexity
If scattered light is not controlled, then optical path simplicity is maintained, but image quality deteriorates due to low ANSI contrast
Solution Approach 1:
The enclosure serves as an intermediary component that absorbs scattered light in the optical path between the port window and projection lens. This addition maintains relative optical path simplicity while significantly improving ANSI contrast by preventing stray light from degrading image quality.
Solution Approach 2:
The patent converts the harmful scattered light into a manageable issue by using light-absorbing materials within the enclosure. The scattered light that would otherwise degrade contrast is now absorbed and converted into negligible thermal energy, transforming a quality problem into a controlled parameter.
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 maintains high ANSI contrast levels by minimizing stray light and improving image quality, achieving intra-frame contrast ratios of ≥800:1, comparable to systems without polarization modulators.
Implementation Method 1
The enclosure can absorb the portion of the image light redirected by the projection lens and can absorb the portion of the projected image light redirected by the surface
Implementation Method 2
redirecting a portion of the image light away from the image light path as result of being scattered or reflected away from the image light path
Implementation Method 3
redirecting a portion of the image light away from the image light path as result of being scattered or reflected away from the image light path
Implementation Method 4
The port window has a surface for redirecting a portion of the projected image light as result of being scattered or reflected away from the image light path
Implementation Method 5
The port window has a surface for redirecting a portion of the projected image light as result of being scattered or reflected away from the image light path
Data Source
AI summary
A projection system includes a projection lens to project image light along an image light path towards a port window and to redirect a portion of the image light away from the image light path as result of being scattered or reflected away from the image light path. The projection system includes a port window for transmitting projected image light from the projection lens. The port window has a surface for redirecting a portion of the projected image light as result of being scattered or reflected away from the image light path. The projection system includes an enclosure positioned between the port window and the projection lens to surround the image light path between the port window and the projection lens. The enclosure absorbs the portion of the image light redirected by the projection lens and absorbs the portion of the projected image light redirected by the surface.