Diffusion Rotating Device for Laser Projector Energy Distribution
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Solution Overview
Problem
Conventional light spot shaping elements in laser projectors cannot individually optimize different phosphor regions on a phosphor wheel, leading to inefficient energy distribution and potential damage to the light wavelength conversion element due to excessive energy concentration at the center of the light spot.
Innovation Solution
A diffusion rotating device with a substrate featuring concentrically arranged diffusion sub-regions of varying diffusivity is integrated into the light beam path, allowing for individual optimization of light spots across different partitions, thereby distributing energy more evenly and reducing the risk of overheating the light wavelength conversion element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a general light spot shaping element is used to adjust the blue laser beam, then the light spot shape can be controlled, but the energy distribution cannot be individually optimized for different phosphor regions, resulting in expanded light spots and decreased blue light efficiency
Solution Approach 1:
The light spot shaping element is divided into multiple independent diffusion sub-regions (first diffusion sub-region, second diffusion sub-region, etc.) corresponding to different phosphor regions. Each sub-region can independently control the light spot shape and energy distribution for its specific phosphor region, enabling individual optimization while maintaining overall system efficiency.
2Use of energy by moving object
If the blue laser beam is expanded to match the energy density required by different phosphor regions, then the energy distribution can be adjusted, but the efficiency of blue light is decreased
Solution Approach 1:
Different diffusion sub-regions are designed with different diffusion coefficients to create locally optimized energy distribution patterns. The first diffusion sub-region has a first diffusion coefficient tailored for the first phosphor region, while the second diffusion sub-region has a second diffusion coefficient for the second phosphor region, ensuring each region receives appropriate energy density without overall expansion that would waste blue light.
3Productivity
If the light spot energy is concentrated at the center to improve conversion efficiency, then the conversion efficiency increases, but the light wavelength conversion element may be damaged due to excessive energy concentration
Solution Approach 1:
The illumination path is segmented into multiple sub-regions with different diffusion coefficients, distributing the total energy across multiple spatial locations. This segmentation prevents excessive energy concentration at any single center point, protecting the wavelength conversion element from overheating while maintaining high overall conversion efficiency through the combined output of all sub-regions.
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 solution enhances the optical efficiency of the projection device by ensuring even energy distribution across the light spot, preventing excessive concentration and subsequent damage to the wavelength conversion element, while maintaining high conversion efficiency.
Implementation Method 1
the first diffusion region has a plurality of first diffusion sub-regions, wherein each of the plurality of first diffusion sub-regions extends along a circumferential direction of the substrate and the plurality of first diffusion sub-regions are arranged concentrically along a radial direction of the substrate, wherein when the first diffusion region is cut into the transmission path of the light beam, the light beam forms a first light spot on the first diffusion region of the substrate
Data Source
AI summary
A diffusion rotating device disposed on a transmission path of a light beam is provided. The diffusion rotating device includes a substrate, a rotating axis and a driving element. The rotating axis is connected to the substrate. The driving element is connected to the rotating axis, and drives the rotating axis to rotate. The substrate includes a first diffusion region and an optical region disposed adjacent to each other, and the first diffusion region has multiple first diffusion sub-regions, each of the first diffusion sub-regions extends along a circumferential direction of the substrate and the first diffusion sub-regions are arranged concentrically along a radial direction of the substrate, when the first diffusion region is cut into the transmission path of the light beam, the light beam forms a first light spot on the first diffusion region of the substrate. A projection device is also provided.