3D Display Moiré Vanishing Element Spatial Frequency Filtering
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Solution Overview
Problem
Three-dimensional display devices with transmissive display units arranged in different depth positions suffer from moiré interference patterns, which existing techniques fail to completely eliminate.
Innovation Solution
Incorporating a moiré vanishing element that diffuses light with a spatial frequency characteristic to cut off spatial frequencies more than twice the interval of pixel boundaries, positioned between transmissive display units to prevent the occurrence of moiré by making the smallest-cyclic structure invisible to the observer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diffuser plate is disposed between transmissive display units to prevent moiré, then moiré interference patterns are reduced, but image quality and resolution deteriorate due to excessive light diffusion
Solution Approach 1:
The patent applies local quality by creating a multi-layer structure where different regions have different diffusion characteristics. The moiré vanishing element has varying diffusion coefficients in different layers, allowing selective diffusion of moiré patterns while preserving fine image details. This resolves the contradiction by making the diffusion property non-uniform - strong diffusion where moiré occurs, weak diffusion where image quality matters.
Solution Approach 2:
The patent changes the diffusion parameter spatially and spectrally. The moiré vanishing element uses multiple layers with different diffusion coefficients, and the diffusion strength varies with spatial frequency. High spatial frequency components (fine image details) pass through with minimal diffusion, while low spatial frequency components (moiré patterns) are strongly diffused. This parameter variation resolves the contradiction between moiré reduction and image quality preservation.
2Adaptability or versatility
If multiple transmissive display units are arranged in different depth positions to create 3D display, then three-dimensional imaging capability is improved, but moiré interference patterns occur due to pixel pattern overlap
Solution Approach 1:
The patent introduces a moiré vanishing element as an intermediary between the transmissive display units. This intermediate layer selectively diffuses light to eliminate moiré patterns formed by overlapping pixel structures at different depths, while maintaining the 3D display capability. The intermediary resolves the contradiction by filtering out harmful interference patterns without blocking the 3D imaging function.
Solution Approach 2:
The moiré vanishing element is constructed as a composite structure with multiple layers having different diffusion coefficients. This composite material approach allows simultaneous achievement of moiré reduction and 3D display functionality - each layer contributes differently to the overall effect, with some layers targeting moiré suppression and others preserving image quality and 3D capability.
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
Effectively prevents moiré interference by ensuring the smallest-cyclic structure of the transmissive display unit behind the moiré vanishing element remains invisible, maintaining image quality and resolution.
Implementation Method 1
a moire vanishing element that diffuses light
Implementation Method 2
the moire vanishing element has a spatial frequency characteristic to cut off a spatial frequency more than a spatial frequency having a cycle being twice as large as an interval of boundaries of pixels
Data Source
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AI summary
A three-dimensional display device includes a plurality of transmissive display units arranged in different depth positions in view from an observer and a moiré vanishing element for diffusing light. The moiré vanishing element has a spatial frequency characteristic to cut off a spatial frequency more than a spatial frequency having a cycle being twice as large as an interval of boundaries of pixels forming a first transmissive display unit arranged behind the moiré vanishing element in the view from the observer.