Anisotropic Scattering Member Iridescence Reduction
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Solution Overview
Problem
Display devices with anisotropic scattering members suffer from adverse iridescence issues like rainbow-colored glare due to optical interference, which deteriorates display quality.
Innovation Solution
A display device with a sheet-like anisotropic scattering member is designed such that light enters from a surface with a large refractive index difference between low and high refractive index areas and exits from a surface with a small refractive index difference, satisfying the mathematical formula 0.7<T(θ−φ)/T(θ)≦1, where θ<0, to minimize iridescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an anisotropic scattering member is used to control viewing angle and increase reflection ratio, then display quality is improved, but iridescence occurs due to optical interference
Solution Approach 1:
The patent changes the refractive index distribution parameters within the anisotropic scattering member. Specifically, it creates a gradient where the refractive index difference between low and high refractive index areas varies through the thickness of the member, with a larger difference at the incident light surface and a smaller difference at the exit surface. This parameter gradient reduces optical interference effects that cause iridescence while maintaining the viewing angle control function.
Solution Approach 2:
The anisotropic scattering member is designed as a composite structure with regions of different refractive indexes. The member contains both low refractive index areas and high refractive index areas in a controlled distribution, creating a composite material structure that manages light scattering and reduces interference patterns responsible for iridescence.
2Illumination intensity
If the refractive index difference is increased to enhance scattering effect, then light scattering performance is improved, but optical interference and iridescence are intensified
Solution Approach 1:
The patent applies local quality by creating spatial variation in the refractive index difference within the anisotropic scattering member. The refractive index difference is locally optimized: larger at the incident light surface to enhance scattering, and smaller at the exit surface to reduce optical interference. This local differentiation resolves the contradiction between scattering performance and interference reduction.
Solution Approach 2:
The refractive index difference parameter is changed as a function of position through the thickness of the scattering member. By gradually varying this parameter from a larger value at the incident surface to a smaller value at the exit surface, the patent achieves both effective light scattering and reduced optical interference effects.
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 effectively reduces iridescence, enhancing display quality by scattering light appropriately and maintaining transmittance equivalence between different angles, thus preventing glare and improving observer experience.
Implementation Method 1
a sheet-like anisotropic scattering member, wherein the sheet-like anisotropic scattering member has a surface in which both a low refractive index area and a high refractive index area exist, the sheet-like anisotropic scattering member is disposed so that light enters from a first surface of the sheet-like anisotropic scattering member and exits as scattered light from a second surface
Implementation Method 2
both a low refractive index area and a high refractive index area exist, when an extent of refractive index difference at a boundary or vicinity thereof between the low refractive index area and the high refractive index area is relatively large in the first surface and relatively small in the second surface
Data Source
AI summary
A display device includes a reflective image display unit having a sheet-like anisotropic scattering member. The sheet-like anisotropic scattering member has a surface in which both a low refractive index area and a high refractive index area exist. The sheet-like anisotropic scattering member is disposed so that a light enters from a first surface thereof and exits as scattered light from a second surface thereof, when an extent of refractive index difference at a boundary or vicinity thereof between the low refractive index area and the high refractive index area is relatively large in the first surface and relatively small in the second surface.