Projection Light Source Supplemental Flux Collection
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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 introducing 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 introducing and collection devices optimized to minimize light loss, ensuring that the luminous flux of scattered and reflected supplemental light is less than or equal to a quarter of the collected flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a supplemental light source is added to improve red color light generation, then the red light output is improved, but the optical efficiency is reduced due to light loss from the light conversion device
Solution Approach 1:
A light introducing device is introduced as an intermediary component between the supplemental light source and the wavelength conversion device. This device guides and focuses the supplemental light onto the wavelength conversion device, ensuring that the added light contributes maximally to red light generation while minimizing unnecessary reflections and losses in the optical path.
Solution Approach 2:
The patent optimizes the geometric parameters (size, shape, position) of the light introducing device and light collection device to control light paths. By carefully selecting these parameters, the system ensures that the supplemental light is efficiently converted to red light while minimizing the portion of light that would otherwise be reflected back or lost, thereby improving overall optical efficiency.
2Power
If the light conversion device is used to convert excitation light to converted light, then the converted light is generated, but high reflectivity causes light to propagate backward and reduce optical efficiency
Solution Approach 1:
The patent extracts and addresses the harmful backward-propagating light by introducing a light collection device that specifically captures this reflected light. The light collection device is positioned and designed to collect the light that would otherwise be lost due to reflection from the wavelength conversion device, converting this wasted energy into useful output.
Solution Approach 2:
Instead of allowing the reflected light to be discarded or lost, the patent recovers it through the light collection device. The system captures the light that would normally be reflected backward and redirects it to contribute to the final output, thereby recovering energy that would otherwise be wasted and improving overall optical efficiency.
3Illumination intensity
If red phosphor is used for color conversion, then red color light is generated, but the conversion efficiency is much lower than other color phosphors
Solution Approach 1:
The patent merges two approaches to red light generation: the wavelength conversion device that converts excitation light to converted light (which can be red), and a supplemental light source that directly provides red light. By combining these two methods, the system overcomes the low conversion efficiency of red phosphor by supplementing the output with additional red light from the supplemental source, while the light introducing device ensures this supplemental light is efficiently integrated into the overall optical path.
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 luminous flux of the converted light, thereby increasing the overall efficiency of the light source.
Implementation Method 1
a wavelength conversion device, used to convert the excitation light to converted light
Implementation Method 2
the first light introducing device is used to direct the first supplemental light to the wavelength conversion device which scatters and at least partially reflects the first supplemental light
Implementation Method 3
the first light introducing device is used to direct the first supplemental light to the wavelength conversion device which scatters and at least partially reflects the first supplemental light
Data Source
AI summary
A projection device including a light source system having an excitation light source for generating a excitation light, a wavelength conversion device, a supplemental light source for generating a supplemental light, a light introducing 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 introducing device and the light collection device, the luminous flux of the supplemental light that is lost due to the light introducing device is less than or equal to a quarter of that the luminous flux of the supplemental light collected by the light collection device. The converted light is supplemented by the supplemental light.