LED Illumination Device with Segmented Color Conversion Cavity
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Solution Overview
Problem
Illumination devices using LEDs face limitations in light output level, color quality stability, and expense due to requirements for color control electronics and sensors, with poor color rendering and spatial/angular variations in color.
Innovation Solution
An illumination module with a color conversion cavity featuring different wavelength converting materials on its interior surfaces, where LEDs selectively illuminate specific surfaces to achieve a range of correlated color temperatures (CCT) through controlled current supply, optimizing color conversion efficiency and minimizing photon loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wavelength converting materials are used on different interior surfaces of the color conversion cavity, then the range of achievable correlated color temperatures (CCT) is expanded and color conversion efficiency is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The color conversion cavity is segmented into multiple interior surfaces, each coated with different wavelength converting materials. This segmentation allows independent optimization of each surface for specific wavelength conversion functions, enabling broader CCT range while maintaining manageable complexity through modular design
Solution Approach 2:
Different interior surfaces of the color conversion cavity are assigned different wavelength converting materials with specific properties optimized for their local function. This local quality approach allows each surface to contribute differently to the overall color output, expanding the achievable CCT range without requiring complete system redesign
2Loss of energy
If LEDs selectively illuminate specific interior surfaces to achieve different CCTs, then color conversion efficiency is optimized and photon loss is minimized, but the control system complexity and manufacturing precision requirements increase
Solution Approach 1:
Specific interior surfaces are selectively illuminated by LEDs based on their local wavelength converting material properties. This local quality approach optimizes photon conversion efficiency for each surface while minimizing cross-interference and photon loss, with manufacturing precision requirements managed through standardized surface coating processes
Solution Approach 2:
The LED illumination system is segmented into multiple independent LED sources, each targeted at specific interior surfaces. This segmentation allows independent control and optimization of each LED-surface pair, reducing overall system complexity while improving color conversion efficiency through selective illumination
3Stability of the object's composition
If color control electronics and sensors are used to maintain color point stability, then color quality is improved, but the device complexity, cost, and energy consumption increase
Solution Approach 1:
The illumination device uses multiple LEDs with different spectral characteristics that can be independently controlled to achieve desired color points. This self-service approach allows the system to maintain color stability through direct control of light sources rather than requiring complex external sensing and correction systems, reducing overall device complexity
Solution Approach 2:
The system maintains color point stability by changing the operational parameters (current levels) of different LEDs rather than using complex control electronics. By adjusting the relative contribution of each LED type, the system can maintain stable color output across varying conditions without additional sensors or correction circuitry
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 enables significant changes in CCT with small flux variations, maintaining desirable color characteristics over a broad intensity range, improving color consistency and reducing the need for extensive color control electronics, thus enhancing LED-based lighting systems.
Implementation Method 1
a color conversion cavity with a first interior surface having a first wavelength converting material and a second interior surface having a second wavelength converting material
Data Source
AI summary
An illumination module includes a color conversion cavity with a first interior surface having a first wavelength converting material and a second interior surface having a second wavelength converting material. A first LED is configured to receive a first current and to emit light that preferentially illuminates the first interior surface. A second LED is configured to receive a second current and emit light that preferentially illuminates the second interior surface. The first current and the second current are selectable to achieve a range of correlated color temperature (CCT) of light output by the LED based illumination device.