Lighting Device Segmented Phosphor Wheel for Color Intensity Control
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Solution Overview
Problem
Conventional lighting devices using phosphor wheels struggle to produce light of desired color intensity and timing due to fixed excitation light for phosphors, leading to insufficient brightness and inefficient color reproduction.
Innovation Solution
A lighting device with multiple solid-state light sources and phosphors that allow individual control of lighting timing and intensity, using different wavelengths for each phosphor to produce consistent fluorescence or projection light, enabling high-intensity color light combination, including the option for a third light source to achieve white light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phosphor wheel with segment areas is used to produce different color light, then color light of desired color can be obtained by controlling lighting and extinction of light sources, but the intensities of the obtained color light are not sufficient and the device cannot produce light of preferred color at desired timing
Solution Approach 1:
The phosphor layer is divided into multiple phosphor regions, each containing phosphors with different characteristics. This segmentation allows different light sources to excite different phosphor regions independently, enabling control over color and intensity of emitted light while maintaining high fluorescence intensity from each region.
Solution Approach 2:
Different phosphors are placed in different regions of the phosphor layer, giving each region local quality optimized for specific excitation wavelengths. This allows each light source to excite its corresponding phosphor region most effectively, maximizing fluorescence intensity for each color channel.
2Device complexity
If a single excitation light is used for all phosphors, then the device structure is simplified, but most suitable excitation light cannot be selected for each phosphor causing insufficient brightness
Solution Approach 1:
The excitation system is segmented into multiple light sources, each emitting at a wavelength optimized for exciting specific phosphors in corresponding regions. This segmentation enables selection of most suitable excitation light for each phosphor type, maximizing fluorescence brightness while maintaining manageable system complexity through modular design.
3Ease of operation
If phosphors are applied only to segment areas on the phosphor wheel, then color light can be controlled by rotating the wheel, but the intensities of obtained color light are insufficient and white light production is inefficient
Solution Approach 1:
The phosphor wheel is designed to rotate dynamically, bringing different phosphor regions into position under the excitation light sources as needed. This dynamic positioning enables efficient production of various colors and white light by selecting which phosphor regions are illuminated, while maintaining high intensity through optimized phosphor-light source matching.
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 consistent wavelength production regardless of light source timing, achieving high-intensity color light with reduced component count and size, while allowing for dynamic intensity adjustment and cost reduction through unified light source types.
Implementation Method 1
The phosphor layer receives ultraviolet light emitted from the solid-state light source as excitation light, and converts the ultraviolet light to visible light
Implementation Method 2
the phosphor layer receives ultraviolet light emitted from the solid-state light source as excitation light, and converts the ultraviolet light to visible light
Data Source
AI summary
A lighting device configured to output light of predetermined color includes: a plurality of solid-state light sources including at least a first solid-state light source and a second solid-state light source; a drive section configured to drive each of the plurality of solid-state light sources individually; a first phosphor for excitation by first emission light emitted from the first solid-state light source; and a second phosphor for excitation by second emission light emitted from the second solid-state light source, and first fluorescence and second fluorescence are of different color.