Wavelength Conversion Structure for Reduced Lateral Light Scattering
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Solution Overview
Problem
The energy conversion efficiency of wavelength conversion components in laser light projectors is poor due to light scattering, which affects the performance and maintenance costs of the projectors.
Innovation Solution
A wavelength conversion component with a substrate, reflection layer, and phosphor layer, where the reflection layer has a height variation and the phosphor layer has a thickness variation, limiting the exit direction of excited light and reducing lateral scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional wavelength conversion component is used, then the device structure is simple, but the energy conversion efficiency is poor due to light scattering
Solution Approach 1:
The reflection layer is designed with varying thickness along the first direction, creating local quality variations that control light reflection at different positions. This non-uniform thickness distribution optimizes light confinement and reduces scattering, thereby improving energy conversion efficiency without requiring complete structural redesign
Solution Approach 2:
The invention introduces thickness variation in the reflection layer along the first direction, adding a dimensional parameter to the otherwise planar structure. This dimensional change enables spatially selective light control, confining excited light in the lateral direction and directing it perpendicular to the component, thus reducing scattering losses
2Loss of energy
If the reflection layer has uniform thickness, then the manufacturing process is simple, but the excited light scatters laterally reducing efficiency
Solution Approach 1:
The reflection layer transitions from uniform thickness to locally varied thickness along the first direction. This local quality variation creates position-dependent optical properties that confine excited light laterally while maintaining manufacturability through controlled deposition or etching processes
Solution Approach 2:
The thickness parameter of the reflection layer is changed from a constant value to a spatially varying parameter along the first direction. This parameter change enables dynamic control of light reflection and confinement, reducing lateral scattering while the variation pattern can be controlled to maintain manufacturing feasibility
3Loss of energy
If the phosphor layer thickness is increased, then more light can be converted, but the energy conversion efficiency decreases due to increased scattering
Solution Approach 1:
The phosphor layer thickness is optimized in conjunction with the reflection layer variation, creating local quality matching between the two layers. This coordination ensures that phosphor conversion occurs at optimal positions where light confinement is strongest, improving efficiency without requiring excessive phosphor material
Solution Approach 2:
The phosphor layer thickness parameter is adjusted to work synergistically with the reflection layer thickness variation. By coordinating these parameters, the system achieves optimal light conversion efficiency while minimizing the quantity of phosphor material needed, as light is confined more effectively in the lateral direction
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 effectively reduces lateral scattering and etendue, improving the energy conversion efficiency and light utilization of the wavelength conversion component and the associated light source module.
Implementation Method 1
The laser light projector generates visible light of other wavelengths by exciting phosphors on a wavelength conversion component such as color wheels with light containing specific wavelengths (e.g., blue light)
Implementation Method 2
disposing the phosphor layer on the reflection layer with a height variation can effectively limit the exit direction of the excited light generated by the phosphor layer
Data Source
AI summary
A wavelength conversion component includes a substrate, a reflection layer, and a phosphor layer. The reflection layer is disposed on the substrate and extends along a first direction. The reflection layer has a top surface that is away from the substrate. The top surface has a height variation on a second direction that is perpendicular to the first direction along the first direction. The phosphor layer is disposed on the reflection layer. The phosphor layer has a thickness variation on the second direction along the first direction. A ratio of the height of the top surface and the thickness of the phosphor layer increases and decreases reciprocally along the first direction.