Optical Beam Deflection Arrangement Spacer Design
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Solution Overview
Problem
Existing optical beam deflection arrangements in multi-view displays face challenges with optical performance due to the presence of a liquid or gaseous layer, leading to reduced visibility and increased optical defects, particularly when trying to switch between two-dimensional and autostereoscopic modes.
Innovation Solution
The use of spacers extending from the substrate and optionally from the first layer to maintain a consistent distance and minimize contact areas between the substrate and the curved surfaces of the first layer, ensuring that the gaseous or liquid material covers the entire deflecting surface, thereby reducing visibility of spacers and enhancing optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the substrate surface is placed close to the curved surfaces of the first layer, then the structure is compact and easier to manufacture, but the gaseous or liquid material cannot cover the entire deflecting surface, leading to optical defects and reduced visibility
Solution Approach 1:
The patent introduces spacers as intermediary elements between the substrate and the first layer. These spacers maintain a consistent gap that allows the gaseous or liquid material to uniformly cover the entire deflecting surface, ensuring optimal optical performance while preventing direct contact that would cause optical defects.
Solution Approach 2:
The patent extracts the spacing function from the direct substrate-layer contact and implements it through separate spacer elements. This extraction allows the gaseous or liquid material to be properly positioned and distributed across the deflecting surface without being blocked by direct contact points.
2Manufacturing precision
If spacers are used to maintain distance between substrate and first layer, then optical performance is improved by ensuring material coverage, but the spacers become visible and add to device complexity
Solution Approach 1:
The patent applies the principle of color changes by making the spacers optically invisible through refractive index matching. The spacers are fabricated from material with the same refractive index as the surrounding medium, causing them to become invisible under normal viewing conditions while still performing their spacing function.
Solution Approach 2:
The patent achieves homogeneity by ensuring that the spacer material has uniform optical properties matching the surrounding environment. This homogeneity in refractive index makes the spacers indistinguishable from the medium they are embedded in, eliminating visual distractions while maintaining structural integrity.
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 configuration enhances optical performance by minimizing spacer visibility and maintaining consistent thickness, allowing for effective switching between optical states and reducing optical defects, while simplifying manufacturing and accommodating flexible materials.
Implementation Method 1
light is refracted at an interface between a solid material and a gaseous/liquid material
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
There is disclosed an optical beam deflection arrangement which may be used in an autostereoscopic display device. The arrangement comprises a substrate; a first layer, for example formed of an optically isotropic solid and having a curved surface facing towards the substrate; and a second layer, for example formed of a liquid crystal material confined between the substrate andthe first layer. An interface between the first and second layers may, for example, define an array of parallel lenticulars. A refractive index of the second layer, for light of a predetermined polarization, maybe switchable between a first value matching the refractive index of the first layer and a second value different to the refractive index of the first layer, to thereby selectably provide a beam deflectionfunction. The substrate is spaced from the first layer by a plurality of spacers which are extended from the substrate or from the first layer, the spacers making point or line contact with the other one of the substrate and the first layer. The spacers may comprise elongate spacers having a length direction parallel to the plane of the substrate.The substrate and the first layer may be formed offlexible plastics materials, in which case the arrangement may be manufactured using roll- to-roll processing techniques.