Shell Integrator Light Engine for Color Homogenization
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Solution Overview
Problem
Existing light engines struggle to achieve uniformity in color and luminance, particularly when using LEDs, as they often require inefficient phosphor down-conversion and heat generation, and lack real-time feedback mechanisms to adjust for failed or changed light-source components.
Innovation Solution
Incorporating a solid dielectric light-guide with a reflective feature into the shell mixer optic, allowing for real-time color and luminance measurements and corrections, using a sensor array to monitor and control the light engine output, while maintaining efficiency and color mixing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs of different colors are used to produce white light, then the light engine can achieve better color quality, but it becomes difficult to balance intensities and homogenize the light output
Solution Approach 1:
The patent combines multiple LED color sources (violet, blue, cyan, green, yellow-green, yellow, orange, red) with a shell integrator optic into a single integrated light engine system. The shell integrator merges the light paths from all LED sources, automatically homogenizing the output while maintaining the ability to independently control each LED's intensity through electronic dimming channels.
Solution Approach 2:
The patent incorporates photodetector sensors that continuously monitor the spectral power distribution and color temperature of the light output. This feedback is processed by a microcontroller that automatically adjusts the intensity of individual LED channels to maintain desired color quality metrics, eliminating manual balancing requirements.
2Illumination intensity
If phosphor down-conversion is used to convert blue LED light to other wavelengths, then white light can be produced, but the process is inefficient and generates excessive heat
Solution Approach 1:
Instead of using a single blue LED with phosphor down-conversion, the patent segments the white light generation into multiple direct-emitting LEDs of different colors (violet, blue, cyan, green, yellow-green, yellow, orange, red). Each LED converts electrical energy directly to its specific wavelength with high efficiency, avoiding the energy losses and heat generation associated with phosphor down-conversion.
3Device complexity
If the light engine lacks real-time feedback mechanisms, then the device complexity is reduced, but the system cannot detect or correct for failed or changed light-source components
Solution Approach 1:
The patent incorporates photodetector sensors positioned to receive light from the optical system, with their signals fed to a microcontroller. The microcontroller continuously monitors the spectral power distribution and compares it against expected values, enabling real-time detection of LED failures or characteristic changes. The system can automatically correct for such changes by adjusting the intensity of remaining functional LEDs.
Solution Approach 2:
The light engine system performs self-diagnosis and self-correction through the integrated sensor and microcontroller system. When component failures or drift are detected, the system automatically compensates by adjusting the output of individual LED channels to maintain the desired spectral power distribution and color quality, without requiring external intervention.
4Manufacturing precision
If adjustments are made to achieve desired light engine output, then color and luminance uniformity can be improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent achieves color and luminance uniformity by electronically controlling the intensity parameters of individual LED channels through dimming coefficients. Rather than requiring precise physical manufacturing tolerances, the system adjusts optical output parameters (intensity, spectral distribution) through electronic control, significantly simplifying the manufacturing process while maintaining high uniformity standards.
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 compact, versatile, and efficient light engines with high optical efficiency, achieving 95% or more efficiency, and allows for automatic real-time color/flux tuning, ensuring consistent light output and detecting component failures.
Implementation Method 1
The reflective feature operates preferably by total internal reflection (TIR) or optionally a back-surface mirror
Implementation Method 2
The reflective feature operates preferably by total internal reflection (TIR) or optionally a back-surface mirror
Implementation Method 3
a solid dielectric light-guide running from the zenith of the hem ispherically-shaped shell mixer along the curve of the shell mixer to one side of the base
Data Source
AI summary
A shell integrator has a hollow transparent body with inner and outer surfaces formed as arrays of lenslets. Each lenslet of the inner surface images a common source region in the middle of the hollow body onto a respective lenslet of the outer surface. Each lenslet of the outer surface forms a virtual image of the respective lenslet of the inner surface at the common source region. One integrator has a light-guide following the surface of the hollow body from an inlet end at a central region of the surface to an outlet end at a rim of the hollow body. The light-guide inlet end is shaped to receive light from the common source region and direct such light along the light-guide. Another integrator is generally elongated, and may be semicylindrical. Any of these integrators may have a stepped surface forming a Fresnel lens.