Color Modulated LED Illumination with Constant Luminous Flux
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Solution Overview
Problem
Current LED-based illumination devices face limitations in light output level, color quality, and cost due to color point instability, poor color rendering, and spatial/angular variations, necessitating improvements in LED lighting technologies.
Innovation Solution
An LED-based illumination system that modulates light color based on digital data while maintaining constant luminous flux, using a combination of LEDs and wavelength converting materials within a color conversion cavity to achieve stable and adjustable color output, allowing for efficient data transmission through color modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple LEDs with different colors are used to achieve color modulation, then color quality and rendering are improved, but device complexity and cost increase due to required color control electronics and sensors
Solution Approach 1:
The illumination device is segmented into multiple independent LED channels (first LED, second LED, third LED) each emitting different colors. This segmentation allows independent control of each LED's current to achieve color modulation while maintaining simple control architecture without complex color control electronics.
Solution Approach 2:
The patent applies dynamic current modulation to the LED channels based on received signal strength. The control circuit dynamically adjusts the current supplied to each LED channel according to the signal strength from the photodetector, enabling real-time color adjustment without requiring complex closed-loop color control systems.
2Illumination intensity
If LED current is increased to improve light output level, then luminous flux increases, but color point stability deteriorates and spatial/angular variations worsen
Solution Approach 1:
The patent changes the operating parameters by using multiple LED channels with different colors and modulating their individual currents independently. This allows the system to achieve high luminous flux while maintaining color point stability through coordinated control of multiple light sources rather than relying on a single LED channel.
Solution Approach 2:
The illumination device uses a composite light source combining multiple LED channels with different emission characteristics. This composite approach allows the system to achieve both high luminous flux and stable color points by combining the advantages of different LED types and controlling their individual contributions.
3Manufacturing precision
If wavelength converting materials are used to improve color rendering, then color quality improves, but device complexity increases due to additional color conversion components
Solution Approach 1:
The patent applies local quality by using wavelength converting materials specifically on the first LED channel that emits blue light. This localized color conversion approach improves color rendering for the blue channel while avoiding the need for complex color conversion components across all LED channels, thereby improving color quality without proportionally increasing overall device complexity.
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 system provides improved color stability and rendering, reduced costs by minimizing the need for extensive color control electronics, and enables effective data communication through color modulation without altering the luminous flux, addressing the limitations of existing LED lighting technologies.
Implementation Method 1
A first LED configured to receive a first current, wherein light emitted from the first LED enters a color conversion cavity
Implementation Method 2
light emitting diodes in general lighting
Implementation Method 3
light emitted from the first LED enters a color conversion cavity
Implementation Method 4
wavelength converting materials within a color conversion cavity
Implementation Method 5
modulating a color of light emitted from the LED based illumination device based on the digital data such that a luminous flux of the light emitted from the LED based illumination device remains approximately constant while the color of light varies
Implementation Method 6
A receiver may receive the emitted light and demodulate a signal indicative of the color of emitted light to determine the digital data
Data Source
AI summary
An LED based illumination device transmits information by receiving an amount of digital data and modulating a color of light emitted from the LED based illumination device based on the digital data. The luminous flux of the emitted light remains approximately constant while the color of light varies. A receiver may receive the emitted light and demodulate a signal indicative of the color of emitted light to determine the digital data. The color of the light may be modulated by varying current provided to different LEDs, where the different LEDs cause different color of light to be emitted from the LED based illumination device.