Wavelength Conversion Device with Localized Diffuser
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current projection devices face reduced brightness and poor conversion efficiency due to excessive energy concentration in the wavelength conversion layer, leading to heat generation and reduced service life, with existing solutions like diffusers causing further energy loss.
Innovation Solution
A wavelength conversion device with a substrate, reflection layer, and a first optical layer featuring diffusing particles, where the first optical layer is positioned to diffuse excitation light uniformly, reducing energy concentration and avoiding unnecessary light loss by not overlapping with regions that do not require homogenization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a diffuser is placed between the lens and the wavelength conversion layer, then the energy concentration is reduced, but the total energy of the laser is reduced and brightness is reduced
Solution Approach 1:
The patent applies local quality by placing the diffuser only in specific regions (first and third regions) where energy concentration needs to be reduced, while leaving the second region (where no wavelength conversion layer is present) without diffuser to maintain blue light brightness. This localized application resolves the contradiction by addressing energy concentration problems only where necessary without sacrificing overall brightness.
2Temperature
If the laser energy is too high, then the wavelength conversion layer generates more heat, but the conversion efficiency is poor and brightness is reduced
Solution Approach 1:
The patent divides the wavelength conversion layer into different regions with different properties. The first region contains wavelength conversion layer with diffuser to reduce heat generation through energy diffusion, while the second region has no wavelength conversion layer to avoid heat generation entirely. This local differentiation resolves the contradiction between heat management and conversion efficiency.
3Temperature
If the diffuser is placed over the entire wavelength conversion layer, then energy concentration is reduced, but the blue light region also loses brightness
Solution Approach 1:
The patent implements local quality by selectively placing the diffuser only in the first and third regions where wavelength conversion occurs and heat management is needed, while excluding the second region where blue light is generated. This ensures that energy concentration is controlled where necessary without affecting blue light brightness.
Solution Approach 2:
The patent segments the wavelength conversion layer into multiple regions (first, second, and third regions) with different functional characteristics. The diffuser is applied only to specific segments (first and third regions) rather than the entire layer, allowing differential treatment to resolve the contradiction between heat management and brightness maintenance.
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 enhances the conversion efficiency of the wavelength conversion layer, increasing the brightness of the emitted light beam and extending the service life of the device by evenly distributing energy and minimizing unnecessary light loss.
Implementation Method 1
the first optical layer includes a plurality of first diffusing particles... the first optical layer is used for diffusing the excitation light beam transmitted to the first optical layer to be uniformly distributed
Implementation Method 2
the wavelength conversion layer may emit converted light of corresponding wavelength and brightness after being excited by laser light
Implementation Method 3
the reflection layer is disposed on an upper surface of the substrate... the wavelength conversion layer is disposed on the reflection layer
Data Source
AI summary
A wavelength conversion device includes a substrate, a reflection layer, a wavelength conversion layer, and a first optical layer. The wavelength conversion device has a central axis. The reflection layer is disposed on an upper surface of the substrate. The central axis is perpendicular to the upper surface. The wavelength conversion layer is disposed on the reflection layer and around the central axis, has a complete or partial annular shape, and includes a first region and two second regions. The first region is located between the second regions. The first optical layer is disposed on a surface of the wavelength conversion layer and corresponds to the first region. In an axial direction, an orthographic projection of the first optical layer on the upper surface is not overlapped with an orthographic projection of the second regions on the upper surface. The first optical layer includes first diffusing particles.