Micro-lens Screen Arrays Mitigating Cross-Reflection in Immersive Displays
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Solution Overview
Problem
Immersive display systems face challenges in maintaining high contrast ratio and dynamic range due to cross-talk or cross-reflection between multiple projection surfaces, which reduces image quality, especially in large venues with varied viewing angles.
Innovation Solution
The implementation of screens with arrays of micro-lenses or micro-mirrors, combined with light polarization layers, polarization rotation layers, and non-polarizing light scattering materials, to selectively scatter and absorb light within specific incident angle ranges, thereby reducing cross-reflection and enhancing contrast and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple projection surfaces are used to create immersive viewing experience, then the immersive viewing quality is improved, but cross-reflection between surfaces increases causing reduced contrast ratio and dynamic range
Solution Approach 1:
The patent applies local quality by making different regions of the screen have different optical properties. Specifically, the screen contains both polarizing regions (for rejecting cross-reflection) and non-polarizing light scattering regions (for allowing direct light transmission). This spatial differentiation of material properties enables the screen to simultaneously reject harmful cross-reflected light while maintaining high transmission of direct projected light, thus resolving the contradiction between immersive viewing quality and cross-reflection suppression.
Solution Approach 2:
The patent employs composite materials by combining polarizing materials and non-polarizing light scattering materials within the same screen structure. The polarizing material selectively absorbs cross-reflected light based on polarization state, while the non-polarizing light scattering material allows direct light to pass through with minimal scattering. This composite approach enables the screen to achieve both high contrast ratio (by rejecting cross-reflection) and high transmission (by allowing direct light through), resolving the technical contradiction.
2Object-affected harmful factors
If light scattering materials are used to reduce cross-reflection, then contrast ratio is improved, but light transmission from projector decreases
Solution Approach 1:
The patent applies local quality by making different regions of the screen have different optical properties. Specifically, the screen contains both polarizing regions (for rejecting cross-reflection) and non-polarizing light scattering regions (for allowing direct light transmission). This spatial differentiation of material properties enables the screen to simultaneously reject harmful cross-reflected light while maintaining high transmission of direct projected light, thus resolving the contradiction between immersive viewing quality and cross-reflection suppression.
Solution Approach 2:
The patent employs parameter changes by utilizing the polarization state of light as a distinguishing parameter. Direct light from the projector maintains its original polarization state, while cross-reflected light undergoes polarization changes upon reflection. By using polarizing materials that selectively absorb light based on polarization state, the screen can differentiate between direct and reflected light, allowing high transmission of direct light while rejecting cross-reflection, thus resolving the energy loss contradiction.
3Object-affected harmful factors
If polarizing layers are used to absorb cross-reflected light, then dynamic range is improved, but overall light transmission is reduced
Solution Approach 1:
The patent applies local quality by making different regions of the screen have different optical properties. Specifically, the screen contains both polarizing regions (for rejecting cross-reflection) and non-polarizing light scattering regions (for allowing direct light transmission). This spatial differentiation of material properties enables the screen to simultaneously reject harmful cross-reflected light while maintaining high transmission of direct projected light, thus resolving the contradiction between immersive viewing quality and cross-reflection suppression.
Solution Approach 2:
The patent employs an intermediary approach by using the polarization state of light as a mediator to distinguish between direct and reflected light. The polarizing layers act as selective mediators that allow direct polarized light to pass through while blocking cross-reflected light with different polarization states. This intermediary mechanism enables the screen to maintain high light transmission for direct light while effectively rejecting cross-reflection, thus resolving the contradiction between dynamic range improvement and light transmission loss.
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 solution effectively suppresses cross-reflection, leading to improved contrast ratio and dynamic range, providing a higher quality immersive viewing experience even in environments with a wide range of viewing angles.
Implementation Method 1
a section of non-polarizing light scattering material for individual micro-lenses in the array of micro-lenses. The section of non-polarizing light scattering material has a width that is less than the width D. In use, light from a projector associated with the screen is substantially scattered by the non-polarizing light scattering material
Implementation Method 2
light from a projector associated with a different screen in the immersive display system is substantially absorbed by the polarization layer
Data Source
AI summary
An immersive display system is disclosed that includes screens configured to mitigate reduction in contrast ratio due at least in part to peripheral light incident on the screens. The immersive display system includes at least one screen having an array of micro-lenses, a light polarization layer on top of the array of micro-lenses, a polarization rotation layer, a light reflection layer, and a section of non-polarizing light scattering material for individual micro-lenses in the array of micro-lenses. In use, light from a projector associated with the screen is substantially scattered by the non-polarizing light scattering material and light from a projector associated with a different screen in the immersive display system is substantially absorbed by the polarization layer.