Fluorescent Light Source with Auxiliary Blue LED for Color Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluorescent light source devices fail to maintain a constant color temperature of emitted white light when the intensity of excitation light fluctuates, primarily due to variations in conversion efficiency of the wavelength conversion device with temperature changes.
Innovation Solution
Incorporating an auxiliary light source emitting blue light identical to the excitation light, which is mixed with the fluorescence and partial excitation light to maintain a consistent color temperature, using a dichroic mirror to selectively transmit and reflect light components, and a polarization conversion device to optimize light polarization for improved color stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the intensity of excitation light is reduced for energy saving, then energy consumption is reduced, but the color temperature of emitted white light changes due to conversion efficiency variations
Solution Approach 1:
The patent introduces an auxiliary light source that emits light in the same wavelength range as the excitation light to compensate for color temperature changes. When the main light source operates at reduced intensity, the auxiliary light source adjusts its output to maintain the overall balance between blue and yellow components, thereby stabilizing the color temperature while allowing energy savings.
Solution Approach 2:
The auxiliary light source acts as an intermediary element that mediates between the main light source's variable output and the requirement for stable color temperature. By adding this intermediate component, the system can decouple energy consumption from color temperature stability, allowing independent control of these two parameters.
2Adaptability or versatility
If the intensity of excitation light fluctuates, then adaptability to different operating modes is improved, but the proportion of fluorescent component changes causing color tint variations
Solution Approach 1:
The system dynamically adjusts the intensity of the auxiliary light source based on the operating mode and the resulting color temperature deviations. By changing the parameter (intensity) of the auxiliary light, the system compensates for the proportional changes in fluorescent component caused by excitation light fluctuations, thereby maintaining stable color tint across different operating modes.
Solution Approach 2:
The patent employs a feedback mechanism where the intensities of both the main light source and auxiliary light source are controlled based on detected color temperature or color ratio. This closed-loop control ensures that when excitation light intensity changes to adapt to different modes, the feedback signal triggers appropriate adjustments in the auxiliary light source to maintain stable color output.
3Use of energy by moving object
If conversion efficiency of wavelength conversion device increases due to temperature reduction, then energy conversion efficiency is improved, but the fluorescent component proportion increases causing yellow tint
Solution Approach 1:
When the wavelength conversion device temperature drops and conversion efficiency increases (producing more yellow fluorescence), the system responds by adjusting the intensity parameter of the auxiliary light source (emitting blue light) to increase the blue component proportion. This parameter adjustment compensates for the increased yellow tint, maintaining color balance despite the improved conversion efficiency.
Solution Approach 2:
The patent converts the potentially harmful effect of excessive yellow fluorescence (caused by high conversion efficiency) into a controllable variable. By introducing the auxiliary blue light source, the system can deliberately adjust the blue component to match the enhanced yellow output, thereby benefiting from high conversion efficiency while maintaining color stability through active management of the light composition.
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 solution ensures a consistent color temperature of the emitted white light by compensating for fluctuations in excitation light intensity, maintaining an adequate proportion of fluorescent and excitation light components, thereby preventing color tint changes.
Implementation Method 1
a wavelength conversion device that converts excitation light from a light-emitting device into fluorescence
Implementation Method 2
a dichroic mirror that reflects or transmits the excitation light and transmits or reflects the fluorescence
Data Source
AI summary
The fluorescent light source device according to this invention includes: a light-emitting device emitting blue excitation light; a wavelength conversion device excited by the excitation light and producing yellow fluorescence; and a first dichroic mirror including a region that reflects or transmits the excitation light and a region that transmits or reflects the fluorescence and partial excitation light that was not converted by the wavelength conversion device. The fluorescent light source device mixes fluorescence and partial excitation light from the wavelength conversion device together and emits white light, and further includes an auxiliary light source emitting light in a blue region identical to that of the excitation light. Radiation light from the auxiliary light source is mixed with white light that is a mixture of the fluorescence and the partial excitation light from the first dichroic mirror.