LED Illumination Module with Shaped Reflector and Color Conversion Cavity
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Solution Overview
Problem
Current LED-based illumination devices face limitations in light output level, color quality stability, and color rendering due to spectral bands with little power, leading to spatial and angular variations, and are expensive due to the need for color control electronics and sensors.
Innovation Solution
The implementation of a color conversion cavity with shaped reflective surfaces that direct light from LEDs to specific interior surfaces coated with wavelength converting materials, optimizing light mixing and color conversion for improved color consistency and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used as light source, then energy efficiency is improved, but light output level and color quality stability deteriorate
Solution Approach 1:
The illumination device divides the light generation function into multiple LED chips arranged in an array, with each chip contributing to the total light output. This segmentation allows the system to achieve high overall light output while maintaining the energy efficiency of individual LED chips, resolving the contradiction between using LEDs and achieving sufficient illumination intensity.
Solution Approach 2:
Multiple LED chips are combined in an array configuration within a single illumination device. By merging the output of multiple chips, the system achieves the required light output level while maintaining LED energy efficiency, as the cumulative effect of multiple efficient LEDs meets the illumination requirements.
2Illumination intensity
If multiple LED chips are used to increase light output, then illumination intensity is improved, but color quality stability deteriorates due to spatial and angular variations
Solution Approach 1:
A wavelength converting element is introduced as an intermediary between the LED chips and the output. This element receives light from multiple LED chips with different characteristics and converts the wavelengths to produce a unified, stable color output. The wavelength converting element acts as a mediator that homogenizes the color properties regardless of variations in individual LED chip characteristics or viewing angles.
3Stability of the object's composition
If color control electronics and sensors are added to maintain color point, then color quality stability is improved, but device complexity and cost increase
Solution Approach 1:
The wavelength converting element performs automatic color stabilization without requiring external control electronics or sensors. The conversion process inherently compensates for variations in LED chip characteristics and viewing angles, making the system self-regulating. This eliminates the need for complex control systems while maintaining stable color quality.
4Productivity
If wavelength converting materials are applied to interior surfaces, then color conversion efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The wavelength converting element serves multiple functions simultaneously: it converts wavelengths for color stability, acts as a light mixing cavity to homogenize light from multiple chips, and provides a simplified manufacturing platform. By combining these functions in a single element, the design achieves high color conversion efficiency without proportionally increasing manufacturing 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
This approach enhances light output, stabilizes color quality, and reduces costs by minimizing the need for extensive color control electronics, achieving uniform and efficient color conversion with adjustable color temperature and rendering index.
Implementation Method 1
The shaped reflector includes a first plurality of reflective surfaces that preferentially direct light emitted from a first LED to a first interior surface of the color conversion cavity
Implementation Method 2
interior surfaces coated with wavelength converting materials, optimizing light mixing and color conversion
Data Source
AI summary
An illumination module includes a color conversion cavity with multiple interior surfaces, such as sidewalls and an output window. A shaped reflector is disposed above a mounting board upon which are mounted LEDs. The shaped reflector includes a first plurality of reflective surfaces that preferentially direct light emitted from a first LED to a first interior surface of the color conversion cavity and a second plurality of reflective surfaces that preferentially direct light emitted from a second LED to a second interior surface. The illumination module may further include a second color conversion cavity.