Light Source System Supplemental Light Collection Efficiency
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Solution Overview
Problem
Current light source systems face inefficiencies due to low conversion efficiency of red phosphor and high reflectivity of light conversion devices, leading to reduced optical efficiency and the need for additional light sources to enhance red color light generation.
Innovation Solution
A light source system comprising an excitation light source, a wavelength conversion device, a supplemental light source, a light guiding device, and a light collection device, where the supplemental light is directed to the wavelength conversion device and scattered and reflected light is collected, with the sizes of the light guiding and collection devices optimized to minimize light loss, ensuring that the luminous flux of the supplemental light scattered and reflected by the wavelength conversion device is less than or equal to a quarter of the collected flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If red phosphor is used for color light generation, then red color light can be produced, but the conversion efficiency is much lower than other color phosphors
Solution Approach 1:
The patent combines multiple light sources (blue LED excitation light source plus red supplemental light source) to generate red color light. The red supplemental light source compensates for the low conversion efficiency of red phosphor, merging the direct red light from the supplemental source with the red converted light from the phosphor to achieve high brightness red color light output.
Solution Approach 2:
The patent changes the spectral parameters by introducing a supplemental light source with specific spectral characteristics that overlaps with the converted light spectrum. This parameter change allows the system to compensate for the inefficient red phosphor conversion by adding red light directly from the supplemental source, thereby improving overall red color light output efficiency.
2Illumination intensity
If a supplemental light source is added to improve red color light, then red color light brightness is improved, but the system complexity increases
Solution Approach 1:
The wavelength conversion device serves multiple functions: it converts blue excitation light to red converted light, and also scatters and reflects the red supplemental light to optimize its distribution. The light guiding device and light collection device work together to guide both the excitation light and supplemental light through the wavelength conversion device, making the system components multi-functional and reducing overall complexity.
Solution Approach 2:
The patent merges the optical paths of the excitation light and supplemental light through the wavelength conversion device. Both light sources are directed through the same optical system, and their outputs are combined at the wavelength conversion device, simplifying the overall system architecture while achieving improved red color light performance.
3Illumination intensity
If light conversion device with high reflectivity is used, then red light can be reflected back to supplemental light source, but optical efficiency is reduced
Solution Approach 1:
The patent extracts and removes the harmful reflected red light from the optical path using a light collection device. The light collection device collects the red light that would otherwise be reflected back by the wavelength conversion device, preventing it from returning to the supplemental light source and causing energy loss. This extracted light is then properly directed to the output, improving optical efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where the light collection device monitors and collects the reflected red light, and the light guiding device redirects it through the wavelength conversion device again. This feedback loop ensures that reflected light is properly managed and converted, preventing energy loss while maintaining high red color light output.
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 optical efficiency of the light source system by minimizing light loss and improving the overall luminous flux, thereby addressing the inefficiencies in current systems.
Implementation Method 1
The wavelength conversion device 306 is used to convert the excitation light to converted light
Implementation Method 2
The first light guiding device is used to direct the first supplemental light to the wavelength conversion device
Implementation Method 3
the wavelength conversion device which scatters and at least partially reflects the first supplemental light
Implementation Method 4
the wavelength conversion device which scatters and at least partially reflects the first supplemental light
Implementation Method 5
The first light collection device collects the scattered and reflected light of the first supplemental light
Data Source
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AI summary
This invention provides a light source system and a projection device. The light source system includes an excitation light source (301) for generating a excitation light (2011), a wavelength conversion device (306), a supplemental light source for generating a supplemental light, a light guiding device for directing the supplemental light to the wavelength conversion device, a light collection device for collecting the supplemental light that scattered and reflected by the wavelength conversion device. By setting the relative sizes of the light guiding device and the light collection device, the luminous flux of the supplemental light that is lost due to the light guiding device is less than or equal to a quarter of that the luminous flux of the supplemental light collected by the light collection device. Therefore, by collecting the first supplemental light reflected by the wavelength conversion device, efficiency of light output of the light source is improved.