Laser Light Source System Red Efficiency
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Solution Overview
Problem
Conventional laser light source systems have low efficiency in generating red light due to limitations of phosphor materials, resulting in non-ideal color coordinates and reduced light output efficiency, requiring significant color correction and excessive filtering of other colors.
Innovation Solution
A light source system comprising a first laser array for red light, a second laser array for blue light, a beamsplitting plate directing parts of both lights to a wavelength conversion device and a light scattering device, which together generate and combine red, blue, and converted lights to enhance efficiency and color correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If phosphor material is used to generate red converted light, then the light source system can produce red light, but the efficiency of red light generation is low and color coordinates are non-ideal
Solution Approach 1:
The patent segments the red light generation process into two independent paths: (1) blue laser directly excites red phosphor to generate red converted light, and (2) blue laser is converted to green light which then excites red phosphor to generate red converted light. This segmentation allows optimization of each path independently, improving both efficiency and color coordinates while reducing the trade-off between them.
Solution Approach 2:
The patent employs composite phosphor materials including red phosphor, green phosphor, and yellow phosphor in specific combinations. These composite materials enable simultaneous optimization of red light generation efficiency and color coordinates by leveraging the complementary properties of different phosphors, achieving ideal color rendering while maintaining high efficiency.
2Manufacturing precision
If significant color correction is applied to red converted light, then desired color gamut requirements are met, but the efficiency of red light generation further decreases
Solution Approach 1:
By segmenting the red light generation into two paths with different phosphor compositions, the patent achieves desired color gamut in the second path (green-excited red phosphor) without requiring significant color correction, thereby maintaining high efficiency. The first path provides additional red light contribution that complements the second path.
Solution Approach 2:
The patent changes the excitation wavelength parameter by introducing a second path where green light (530-560nm) excites red phosphor instead of using blue light directly. This parameter change enables optimal color coordinates to be achieved naturally without aggressive color correction, preserving generation efficiency.
3Manufacturing precision
If excessive filtering is applied to other color lights, then color purity is improved, but the effective utilization rate of other color lights decreases
Solution Approach 1:
Instead of filtering out green and blue light as waste, the patent converts green light into a useful component by using it to excite red phosphor in the second path. The green light that would otherwise be filtered becomes a productive excitation source, improving effective utilization rate while maintaining color purity through controlled phosphor conversion rather than filtering.
Solution Approach 2:
The patent recovers green light that would normally be discarded or filtered by using it to excite red phosphor material. This recovery process transforms what was considered waste into a valuable resource for red light generation, improving overall system efficiency without compromising color purity.
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 system increases red light generation efficiency and achieves desired color coordinates, optimizing the entire light source system's output by effectively utilizing red, blue, and converted lights.
Implementation Method 1
the wavelength conversion device includes wavelength conversion materials for receiving the blue laser light and generating a converted light
Implementation Method 2
the light scattering device includes a scattering material for scattering the blue laser light to produce a blue light
Implementation Method 3
a beamsplitting plate located on a light path of the first laser array and the second laser array, for directing at least a part of the red laser light and at least a part of the blue laser light
Implementation Method 4
a light combining device for combining the converted light, the first red light and the blue light into a combined light
Data Source
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AI summary
A light source system and a projection system, comprising: a first laser array (10) for generating red laser; a second laser array (20) for generating blue laser; a beam-splitting diaphragm (60) located in a light path of the first laser array (10) and the second laser array (20), for directing at least a part of the red laser and at least a part of the blue laser to a wavelength conversion device (80); the beam-splitting diaphragm (60) also being used for directing at least a part of the blue laser to an astigmatism device (90); the wavelength conversion device (80) being provided with a wavelength conversion material for receiving the blue laser and producing stimulated light, and for receiving and scattering the red laser to form first red light; the astigmatism device (90) being provided with a scattering material for scattering the blue laser to form blue light; and a light synthesis device for forming synthetic light from the stimulated light, the first red light and the blue light. The light source system and the projection system can improve the efficiency of the light source system in producing red light.