Dielectric Reflective Color Filter for Dynamic Polarization Control
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Solution Overview
Problem
Conventional dielectric-based reflective color filters are limited in the range of colors they can express and are not capable of dynamically changing colors with changes in light polarization, making them unsuitable for commercialization and practical application in display devices.
Innovation Solution
A dielectric-based reflective color filter with a substrate layer and a dielectric layer comprising dielectric units with specific rectangular structures that intersect and are symmetrical, allowing for varying lengths, widths, and angles to control resonance and reflectance, enabling the display of multiple colors and dynamic color changes with polarization angle adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional dielectric nano-structures with simple shapes (rectangular, cylindrical, hemispherical) are used, then the manufacturing process is simple, but the range of colors that can be expressed is limited and dynamic color changes with polarization cannot be achieved
Solution Approach 1:
The dielectric layer is segmented into multiple dielectric units, each with specific geometric structures (first and second structures extending in different directions). This segmentation allows different parts of the structure to interact with different polarization components of light, enabling a wider color range and dynamic color changes while maintaining manufacturability through standardized unit repetition
Solution Approach 2:
The dielectric units incorporate asymmetric geometric structures where the first structure extends in a first direction and the second structure extends in a second direction intersecting the first. This asymmetry breaks the symmetry of simple rectangular, cylindrical, or hemispherical shapes, enabling the structure to respond differently to different polarization angles of incident light, thus achieving dynamic color changes and expanding the expressible color range
2Loss of energy
If metal-based (plasmonics) meta-materials are used for reflective color filter, then the structure is simple to implement, but inherent losses in metal make it difficult to achieve high efficiency
Solution Approach 1:
The patent replaces expensive and lossy metal-based plasmonic materials with dielectric materials that have lower optical losses. The dielectric units use materials with appropriate refractive indices and absorption coefficients to achieve high reflectance and color purity without the inherent losses of metals, improving energy efficiency while maintaining practical manufacturability through conventional semiconductor fabrication processes
Solution Approach 2:
The reflective color filter uses composite dielectric structures combining multiple dielectric materials with different optical properties. The first and second structures in each dielectric unit may use different dielectric materials or have different geometric parameters, creating a composite structure that achieves high reflectance and color purity without metal losses, while remaining manufacturable through standard deposition and etching processes
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 allows for the implementation of a wider range of colors and dynamic color changes based on polarization, enhancing color reproducibility and efficiency, making it suitable for display devices with reduced power consumption.
Implementation Method 1
a dielectric layer formed on the substrate layer, wherein the dielectric layer includes a plurality of dielectric units configured by a first structure extending in a first direction and a second structure intersecting the first structure and extending in a second direction
Implementation Method 2
the reflective color filter may display colors by selectively reflecting only a particular wavelength when reflecting incident white light
Implementation Method 3
there is a limitation that they may not be practically applied to the display device. Further, the simple rectangular, cylindrical, and hemispherical shapes have limitations in that they do not represent dynamic changes due to the polarization of light
Data Source
AI summary
A dielectric-based reflective color filter includes a substrate layer capable of light reflection; and a dielectric layer formed on the substrate layer. The dielectric layer includes a plurality of dielectric units configured by a first structure extending in a first direction and a second structure intersecting the first structure and extending in a second direction. The plurality of the dielectric units is arranged on the substrate layer so as to be spaced apart from each other.