Wavelength Converting Device Light Spot Adjusting Layer
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Solution Overview
Problem
Optical projectors face challenges in achieving higher brightness and uniform light distribution due to excessive concentration of light spots on the fluorescence material, leading to inefficient wavelength conversion and heat buildup, which shortens the device's service life.
Innovation Solution
A wavelength converting device is designed with a light spot adjusting layer between the substrate and photoluminescence layer, utilizing a matrix and light diffusion particles to diffuse and reflect light, preventing excessive concentration of light spots and enhancing optical conversion efficiency, while also improving heat dissipation by reducing the thickness of the photoluminescence layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the photoluminescence layer is made thicker to improve wavelength conversion, then the conversion efficiency increases, but the heat dissipation performance deteriorates and service life decreases
Solution Approach 1:
The device is divided into multiple functional layers: a photoluminescence layer for wavelength conversion, a light spot adjusting layer for light distribution, and a reflecting layer for light reflection. This segmentation allows each layer to have optimized thickness and function, enabling the photoluminescence layer to be thinner while maintaining conversion efficiency through the cooperative action of other layers.
Solution Approach 2:
The light spot adjusting layer acts as an intermediary between the incident light source and the photoluminescence layer. It pre-adjusts the light distribution before entering the photoluminescence layer, reducing the need for excessive thickness to achieve uniform conversion, thereby enabling thinner design with better heat dissipation.
2Illumination intensity
If the photoluminescence layer is made thicker to improve optical conversion, then the brightness increases, but the light spot concentration becomes excessive and service life decreases
Solution Approach 1:
The light spot adjusting layer serves as an intermediary that modifies the light distribution pattern before it reaches the photoluminescence layer. It contains light diffusion particles that scatter and redistribute light, preventing excessive concentration at specific points while maintaining overall brightness.
Solution Approach 2:
The light spot adjusting layer introduces local variations in light distribution through light diffusion particles with different refractive indices. This creates a more uniform local light quality across the photoluminescence layer, preventing hot spots while maintaining high overall brightness.
3Stability of the object's composition
If a light spot adjusting layer is added to improve light distribution, then the uniformity increases, but the device complexity increases
Solution Approach 1:
The light spot adjusting layer is constructed using composite materials - a transparent matrix material embedded with light diffusion particles. This composite structure achieves light distribution adjustment through material properties rather than complex mechanical or optical components, simplifying the overall device structure while improving uniformity.
Solution Approach 2:
The light spot adjusting layer achieves light distribution control by changing optical parameters - specifically, by incorporating particles with different refractive indices in the matrix. This parameter-based approach allows precise control of light scattering without adding mechanical complexity.
4Duration of action of stationary object
If the photoluminescence layer is made thinner to improve heat dissipation, then the service life increases, but the wavelength conversion efficiency decreases
Solution Approach 1:
The optical system is segmented into multiple specialized layers. The photoluminescence layer can be made thin for heat dissipation, while the light spot adjusting layer and reflecting layer compensate for the reduced conversion thickness by optimizing light distribution and reflection, collectively maintaining high conversion efficiency.
Solution Approach 2:
The light spot adjusting layer acts as an intermediary that enhances light-matter interaction in the thinner photoluminescence layer. By pre-distributing light uniformly and preventing concentration, it increases the effective utilization of the photoluminescence material, compensating for the reduced thickness and maintaining conversion efficiency.
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 achieves better optical conversion efficiency, higher brightness, and a larger light emitting area, while prolonging the device's service life by uniformly distributing light spots and reducing heat generated by concentrated light spots.
Implementation Method 1
The photoluminescence layer is disposed over the substrate, and is configured to receive incident light and convert the incident light to excitation light
Implementation Method 2
a refractive index of the photoluminescence layer is different from a refractive index of the light spot adjusting layer
Implementation Method 3
The reflecting layer is disposed between the light spot adjusting layer, and is configured to reflect the incident light and the excitation light
Implementation Method 4
the light spot adjusting layer includes a matrix and a plurality of light diffusion particles
Data Source
AI summary
A wavelength device includes a substrate, a photoluminescence layer, a light spot adjusting layer, and a reflecting layer. The photoluminescence layer is disposed over the substrate, and is configured to receive incident light and convert the incident light to excitation light. The light spot adjusting layer is disposed between the substrate and the photoluminescence layer, and is configured to receive the excitation light and the unconverted incident light and to adjust the light path of the excitation light and the unconverted incident light, in which a refractive index of the photoluminescence layer is different from a refractive index of the light spot adjusting layer. The reflecting layer is disposed between the light spot adjusting layer, and is configured to reflect the incident light and the excitation light.