Rare Earth Phosphate Particles for Light Scattering
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Solution Overview
Problem
Existing light-diffusing sheets used in optical devices lack sufficient light-scattering properties and viewing angle, which affects image clarity and visibility, particularly when applied to displays.
Innovation Solution
Incorporating rare earth phosphate particles containing two different rare earth elements (such as Sc, Y, La, Eu, Gd, Dy, Yb, or Lu) into a substrate or applying them on its surface to enhance light scattering and maintain transparency, utilizing their high refractive index and crystalline structure for improved color reproducibility and wider viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-scattering particles (titania, silica, zirconia, barium titanate, zinc oxide) are used in light-diffusing sheets, then transparency is secured, but light-scattering properties are insufficient for clear image display
Solution Approach 1:
The patent changes the material parameters by using rare earth phosphate particles with specific refractive indices (2.0-2.4) that differ from conventional particles. This parameter change enables superior light-scattering properties while maintaining transparency, directly resolving the contradiction between sufficient light scattering and image clarity
Solution Approach 2:
The patent employs composite light-scattering particles comprising rare earth phosphate combined with other materials or having specific compositional characteristics. This composite approach enhances light-scattering efficiency while preserving optical transparency, thereby improving both image clarity and display quality
2Illumination intensity
If light-diffusing sheets are designed for transparency, then visibility is maintained, but viewing angle is limited
Solution Approach 1:
The patent utilizes rare earth phosphate particles with specific optical parameters (refractive index 2.0-2.4) that simultaneously enhance transparency and widen viewing angle. This parameter optimization allows the light-diffusing sheet to maintain high transparency while expanding the effective viewing cone angle
Solution Approach 2:
The patent applies light-scattering particles with locally optimized properties at different positions or layers within the optical device. By strategically placing rare earth phosphate particles with specific characteristics in particular regions, the system achieves both transparency and wide viewing angle performance
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 rare earth phosphate particles significantly enhance light-scattering properties and provide a wider viewing angle while maintaining substrate transparency, resulting in improved image clarity and visibility across various optical devices.
Implementation Method 1
rare earth phosphate particles containing a rare earth element A and a rare earth element B different from the element A... capable of not only improving light-scattering properties while securing transparency
Implementation Method 2
utilizing their high refractive index and crystalline structure for improved color reproducibility
Data Source
AI summary
A rare earth phosphate particle containing a rare earth element A, where A is Sc, Y, La, Eu, Gd, Dy, Yb, or Lu, and a rare earth element B different from the element A, where B is Sc, Y, La, Eu, Gd, Dy, Yb, or Lu. The phosphate of the element A is preferably crystalline, with at least part of the element B dissolved in the phosphate of the element A in a solid state. The phosphate of the element A preferably has a xenotime or monazite crystal structure.