Immersive 3D Display Optics With Polarized Noise Light Blocking
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Solution Overview
Problem
Existing 3D image display devices struggle to effectively reduce the impact of ambient illuminance on the immersive experience by blocking noise light from the observer's field of view.
Innovation Solution
The display device incorporates a concave mirror to focus image light, a polarization control optical element to transmit image light through a beam splitter, and an anti-reflection film to block noise light, with specific angles and configurations of optical elements to enhance light polarization and reflection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional 3D image display devices are used, then the basic 3D image function is provided, but the immersive experience is degraded due to ambient illuminance and noise light interference
Solution Approach 1:
The patent applies polarization control to convert the harmful effect of ambient light into a beneficial filtering mechanism. By using polarizing beamsplitters and polarization control optical elements, the system selectively transmits desired image light while blocking polarized noise light from ambient sources, thereby improving immersive experience quality
Solution Approach 2:
The patent introduces polarization control optical elements and polarizing beamsplitters as intermediary components between the light source and observer. These intermediaries selectively filter light based on polarization state, allowing image light to pass through while blocking noise light, thus resolving the contradiction between ambient light presence and immersive experience quality
2Object-affected harmful factors
If the anti-reflection film thickness is increased to block more noise light, then noise light blocking performance is improved, but light transmission for image light is reduced
Solution Approach 1:
The patent applies different thicknesses of anti-reflection film at different locations. The film has a first thickness in a first region and a second thickness in a second region, allowing optimization of noise light blocking in certain areas while maintaining image light transmission in other areas. This local differentiation resolves the contradiction between noise blocking and light transmission
Solution Approach 2:
The patent changes the thickness parameter of the anti-reflection film to optimize performance. By adjusting the film thickness to specific ranges (e.g., 50-200nm in some regions, 200-500nm in others), the system achieves both effective noise light blocking and sufficient image light transmission, resolving the contradiction between these two requirements
3Illumination intensity
If the angle between the image forming unit and optical axis is increased to improve light focusing, then light concentration is improved, but optical path alignment becomes more difficult
Solution Approach 1:
The patent employs a concave mirror with specific curvature to focus light from the image forming unit. The curved surface of the concave mirror naturally converges light rays, improving light focusing capability while maintaining manageable optical path alignment. The specific curvature radius is designed to achieve optimal focusing without excessive alignment complexity
4Object-affected harmful factors
If multiple optical elements are added to control polarization and block noise light, then noise light blocking is improved, but device complexity increases
Solution Approach 1:
The patent designs optical elements that perform multiple functions simultaneously. For example, the polarization control optical elements not only control polarization state but also contribute to noise light blocking. The anti-reflection film simultaneously reduces reflections and blocks polarized noise light. This multi-functionality reduces the need for separate components, thereby managing device complexity while improving noise light blocking
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
The solution significantly enhances the immersive experience by minimizing noise light interference, allowing for clearer and more immersive 3D image viewing.
Implementation Method 1
A concave mirror focuses the image light provided by the image forming unit
Implementation Method 2
An anti-reflection film is configured to block noise light from the observer's field of view
Data Source
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AI summary
The disclosed display device includes an image forming unit configured to provide image light, a concave mirror configured to focus the image light provided by the image forming unit, a beam splitter disposed obliquely with respect to a traveling path of the image light emitted from the image forming unit, a polarization control optical element configured to transmit the image light provided by the image forming unit to an observer's field of view through the concave mirror and the beam splitter, and an anti-reflection film configured to block noise light reflected from a polarizer from the observer's field of view on the opposite side of the image forming unit, wherein the thickness of the anti-reflection film decreases away from the central portion of the anti-reflection film.