Wavelength Conversion Element Segmentation for Thermal Management
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Solution Overview
Problem
High-brightness projector designs using high-power laser light-emitting elements generate excessive heat, reducing wavelength conversion efficiency and posing a risk of burning due to continuous irradiation, which affects the reliability of the fluorescent rotary disk.
Innovation Solution
An illumination system with a wavelength conversion element featuring alternately arranged wavelength conversion and non-wavelength conversion regions, where the excitation light source is controlled to emit light only during specific intervals, allowing the beam to penetrate hollow regions and reducing irradiation on solid materials, thereby minimizing heat generation and maintaining optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power laser light-emitting elements are used to achieve high-brightness design, then illumination intensity is improved, but temperature increases causing heat-related issues and reduced reliability
Solution Approach 1:
The fluorescent rotary disk is segmented into multiple wavelength conversion regions (first, second, third wavelength conversion regions) with different phosphor materials, allowing each segment to handle specific wavelength conversions. This segmentation distributes the heat load across multiple regions rather than concentrating it on a single area, improving overall reliability while maintaining high brightness output.
Solution Approach 2:
Different regions of the fluorescent rotary disk are assigned different phosphor materials with specific wavelength conversion characteristics. For example, the first wavelength conversion region uses phosphor for converting blue light to green, while other regions use different phosphors for different conversions. This local differentiation optimizes heat distribution and wavelength conversion efficiency in each specific region, preventing localized overheating.
2Use of energy by moving object
If continuous irradiation of strong energy laser on phosphor is applied, then wavelength conversion efficiency is maintained, but temperature increases causing burning risk and reduced efficiency
Solution Approach 1:
The system employs periodic rotation of the fluorescent rotary disk, bringing different wavelength conversion regions into the laser beam path in sequence. This periodic action allows each phosphor region to receive laser irradiation only during specific time intervals, preventing continuous heating of any single region while maintaining overall wavelength conversion efficiency through the rotational cycle.
Solution Approach 2:
The fluorescent rotary disk is designed to rotate dynamically, transitioning from static to moving state. This dynamic rotation ensures that no single phosphor region remains continuously exposed to the high-power laser beam, distributing thermal load over time and space. The motion converts a potentially static overheating problem into a dynamic heat distribution system.
3Reliability
If phosphor is coated on rotary disk in ring shape, then continuous rotation avoids burning, but wavelength conversion efficiency still declines due to increasing temperature
Solution Approach 1:
The ring-shaped phosphor coating is divided into multiple distinct wavelength conversion regions separated by non-wavelength conversion regions. Each wavelength conversion region contains specific phosphor materials, and the non-wavelength conversion regions act as thermal relief zones. This segmentation allows the rotary disk to maintain rotation for burn prevention while reducing overall temperature rise through the interspersed non-converting regions.
Solution Approach 2:
The wavelength conversion regions are designed with specific structural characteristics that include hollow regions or porous structures. These porous or hollow regions reduce the material density in certain areas, allowing better heat dissipation while maintaining the wavelength conversion function in the solid phosphor portions. This structure helps manage temperature rise during rotation.
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 approach enhances the reliability and optical efficiency of the illumination system and projection device by reducing heat-related issues and preventing color mixing, resulting in a more stable and pure light output.
Implementation Method 1
The wavelength conversion element includes a plurality of wavelength conversion regions and a plurality of non-wavelength conversion regions alternately arranged in a circumferential direction
Data Source
AI summary
An illumination system, configured to provide an illumination beam, is provided. The illumination system includes a first excitation light source, a wavelength conversion element, and a controller. The first excitation light source is configured to provide a first excitation beam. The wavelength conversion element is located on a transmission path of the first excitation beam. The wavelength conversion element includes multiple wavelength conversion regions and multiple non-wavelength conversion regions. The controller controls whether the first excitation light source emits light. During a first time interval, the controller turns off the first excitation light source. During a second time interval, the controller controls the first excitation light source to emit light. The first excitation beam is transmitted to one of the wavelength conversion regions to form a converted beam. The illumination beam includes the converted beam. Another illumination system and multiple projection devices are also provided.