Wavelength Conversion Wheel Assembly for Stage Lighting Color Tuning
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Solution Overview
Problem
Current high power stage lighting devices using metal halide discharge lamps or solid state LEDs face issues with low color rendering capability and high cost, particularly in achieving high brightness and saturation with sufficient white light, due to limitations in heat dissipation and light flux, and require complex real-time control for color adjustment.
Innovation Solution
A lighting device employing a heat dissipating moving unit with segments carrying different wavelength conversion materials, such as phosphor, dye, or quantum dots, which is rotated to selectively illuminate segments by an excitation light source to generate desired colors, utilizing a wavelength conversion wheel assembly and controlled by a motor to achieve efficient white light generation and color tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal halide discharge lamps are used for high power stage lighting, then high brightness is achieved, but color rendering capability is insufficient and color saturation is low
Solution Approach 1:
The patent divides the wavelength conversion function into multiple independent segments, each containing different phosphor materials with specific bandpass characteristics. These segments are arranged in a rotatable wheel structure, allowing selective positioning of different phosphor combinations to convert the broadband UV or blue light from the LED source into various colors with high saturation and improved color rendering.
Solution Approach 2:
The patent uses composite phosphor materials with specific bandpass characteristics in each segment of the rotating wheel. These composite materials are designed to convert the excitation light into specific color ranges, combining multiple phosphors in each segment to achieve both high color saturation and improved color rendering capability simultaneously.
2Ease of manufacture
If narrow band color filters are used to increase color saturation, then color saturation is improved, but brightness of output monochromatic light is reduced
Solution Approach 1:
The patent changes the parameter of wavelength conversion by using different phosphor materials with specific bandpass characteristics in different segments. Instead of using narrow band filters that block most light, the phosphor materials convert the excitation light into desired wavelengths with high efficiency, maintaining brightness while achieving high color saturation through selective wavelength conversion.
3Illumination intensity
If multiple high power LED arrays are used to provide R, G, B lights separately with light combining devices, then high brightness and high saturation monochromatic light is achieved, but cost increases and white light color rendering is insufficient
Solution Approach 1:
The patent segments the color generation function into multiple phosphor-containing segments on a rotating wheel, replacing the need for multiple separate LED arrays and complex light combining devices. A single high-power LED or UV source excites different phosphor segments sequentially, achieving color variation through temporal multiplexing rather than spatial combination of multiple light sources.
Solution Approach 2:
The rotating wheel assembly serves multiple functions: it acts as a color filter, a wavelength converter, and a color mixing device all in one structure. The same excitation source can generate multiple colors by rotating to different phosphor segments, and the system can also produce high-quality white light by positioning segments with phosphors that collectively cover the full visible spectrum.
4Adaptability or versatility
If a moving unit with multiple phosphor materials rotating at high speed is used, then rich color variation is achieved, but real-time control requirements increase
Solution Approach 1:
The patent uses periodic rotation of the wheel containing multiple phosphor segments to achieve color variation. The wheel rotates at controlled speeds to present different phosphor segments to the excitation source in sequence, creating temporal multiplexing of colors. This periodic action allows rich color variation while simplifying control compared to real-time adjustment of multiple independent LED channels.
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 provides a low-cost, high-efficiency method for generating high brightness and saturation light with improved color rendering, reducing the complexity of real-time control and cost compared to existing technologies.
Implementation Method 1
a heat dissipating moving unit with segments carrying different wavelength conversion materials, such as phosphor, dye, or quantum dots, which is rotated to selectively illuminate segments by an excitation light source to generate desired colors
Data Source
AI summary
A lighting device, a method and a light wavelength conversion wheel assembly for color tuning thereof. The lighting device includes a light source which includes an excitation light source and a moving unit. The moving unit includes a light wavelength conversion wheel assembly having a heat dissipation base. The heat dissipation base is divided into a number of segments carrying different wavelength conversion materials, and is controlled to rotate intermittently or rotate to a predetermined angle around a wheel shaft serving as an axis. The heat dissipation base faces the exciting light and is illuminated locally. A control unit controls the rotation so that a predetermined area is rotated into the illumination area of the exciting light. Output light of a predetermined color is provided by the excitation light source and the predetermined area or the wavelength conversion material located in the predetermined area.