Phosphor Wheel Color Gamut Control via Particle Distribution

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Solution Overview

Problem

Optical projectors face challenges in effectively adjusting their color gamut to meet diverse color requirements, as existing fluorescent materials and configurations often result in inadequate color representation, particularly when trying to avoid purple-oriented light emissions.

Innovation Solution

A phosphor wheel comprising a substrate with a luminescence layer containing scattering particles and photoluminescence particles, where the particles are distributed in a glue layer to modulate light emission, achieving a balanced color gamut by adjusting the peak brightness ratios and wavelengths of emitted light, and optionally incorporating wavelength conversion layers to enhance color output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional fluorescent materials are used to drive light emission, then the light source can be activated, but the color gamut cannot be effectively adjusted to meet diverse color requirements and tends to produce purple-oriented emissions

Engineering Contradiction:

Improvecolor gamut adjustabilityVSAvoidpurple bias in light emission

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent divides the luminescence layer into multiple functional components: scattering particles for light diffusion, first photoluminescence particles for primary wavelength conversion, and optionally second photoluminescence particles for additional color adjustment. This segmentation allows independent optimization of each component's properties to achieve precise color gamut control without purple bias

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by using particles with different sizes, materials, and optical properties distributed throughout the luminescence layer. The scattering particles have different refractive indices than the matrix material, creating localized optical properties that enhance light scattering in specific regions, thereby improving color uniformity and adjusting color gamut locally

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If photoluminescence particles are added to the luminescence layer, then color gamut adjustment capability is improved, but the device structure and particle distribution control become more complex

Engineering Contradiction:

Improvecolor gamut adjustment capabilityVSAvoidparticle distribution control

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent introduces a matrix material as an intermediary that binds the scattering particles and photoluminescence particles together. This matrix serves as a medium that facilitates uniform distribution of multiple particle types while simplifying the manufacturing process, as the particles are incorporated into the matrix during a single coating or curing operation rather than requiring separate positioning steps

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The luminescence layer is constructed as a composite material system combining the matrix material with dispersed scattering particles and photoluminescence particles. This composite structure allows the benefits of multiple materials to be integrated: the matrix provides structural continuity and ease of fabrication, while the dispersed particles provide tailored optical functions for color gamut adjustment

Inventive Principle:

Principle #40Composite materials

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 phosphor wheel effectively adjusts the color gamut of optical projectors, ensuring better color representation by modulating light emission spectra and preventing excessive purple bias, thus meeting specific color requirements through optimized particle distribution and layer configurations.

Implementation Method 1

a plurality of scattering particles, where the scattering particles and the first photoluminescence particles are collectively distributed in the glue layer

Methodology Applied

Scientific EffectLight scattering: Scattering

Implementation Method 2

a plurality of first photoluminescence particles, where at least one of the scattering particles is located between the substrate and at least one of the first photoluminescence particles

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS11226547B2Phosphor wheel and light source system using the same

Publication Date: 2022.01.18 DELTA ELECTRONICS INC(CN)

AI summary

A phosphor wheel includes a substrate and a luminescence layer. The luminescence layer is disposed on the substrate and includes a glue layer, a plurality of scattering particles, and a plurality of first photoluminescence particles. The scattering particles and the first photoluminescence particles are collectively distributed in the glue layer. At least one of the scattering particles is located between the substrate and at least one of the first photoluminescence particles, and at least another of the first photoluminescence particles is located between the substrate and at least another of the scattering particles.