Multi-Emitter LED Module Layout for Stable Tunable White Light
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Solution Overview
Problem
Existing LED light sources struggle to efficiently produce a wide range of color temperatures and brightness levels while maintaining consistent color rendering index and chromaticity, limiting their versatility in lighting applications.
Innovation Solution
An emitter module for LED light sources is designed with a specific arrangement of emitters on circular center lines and radial axes, allowing for multiple emitters of different colors to be evenly spaced and oriented to produce a variety of color temperatures and brightness levels, with detectors for feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple differently-colored emitters are combined within the same package to produce white or near-white light, then the color temperature and color rendering index can be adjusted to produce different lighting effects, but the consistency of color rendering and chromaticity across different operating conditions deteriorates
Solution Approach 1:
The emitter module is divided into multiple independently controllable emitter groups, each containing emitters of different colors (e.g., blue, cyan, green, yellow, orange, red). Each group can be driven with different currents to achieve precise control over the spectral composition and color temperature output, allowing consistent color rendering across varying operating conditions.
Solution Approach 2:
The patent employs multiple emitters operating at different wavelengths (colors) and controls their relative intensities by adjusting drive currents. By dynamically changing the parameters of individual emitter groups, the system maintains consistent color rendering index and chromaticity across a wide color temperature range from warm white to cool white.
2Adaptability or versatility
If a wide gamut of color points and correlated color temperatures is achieved by combining different colored LED emitters, then the lighting versatility is improved, but the complexity of controlling color temperature and brightness precision deteriorates
Solution Approach 1:
The control system is segmented into multiple independent emitter group drivers, with each group corresponding to a specific color range. This modular approach simplifies control by allowing independent adjustment of each color group, making it easier to achieve precise color temperature and brightness control across the wide gamut.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the actual light output and color temperature, comparing it against target values. This feedback control automatically adjusts the drive currents to each emitter group, reducing the complexity of manual control and ensuring precise color temperature and brightness reproduction across the entire color gamut.
3Stability of the object's composition
If multiple emitters are arranged on circular center lines with equal angular spacing, then the symmetry and uniformity of light distribution are improved, but the manufacturing precision requirements increase
Solution Approach 1:
Multiple emitters of the same color are electrically combined into groups that share common drive circuits and control logic. This merging reduces the number of independent control elements and simplifies manufacturing, while the geometric arrangement on circular center lines with equal angular spacing ensures uniform light distribution and symmetric optical performance.
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 precise control over color temperature and brightness, ensuring consistent lighting performance across a wide gamut of color points and chromaticity settings, enhancing the versatility and efficiency of LED lighting systems.
Implementation Method 1
a plurality of emitters mounted to the substrate, where each emitter is configured to produce illumination at a different wavelength
Data Source
AI summary
An emitter module for a light-emitting diode (LED) light source may comprise a substrate, and a plurality of emitters mounted to the substrate, where each emitter is configured to produce illumination at a different wavelength, and the number of emitters is greater than four (e.g., five emitters). The emitter module may also comprise a dome mounted to the substrate and encapsulating the plurality of emitters. Each of the plurality of emitters is arranged such that a center of the emitter is located on a circular center line that has a center that is the same as a center of the dome. Each of the plurality of emitters is located on a different primary radial axis of the emitter module. Each of the primary radial axes of the emitter module is equally spaced apart by an offset angle. The emitter module may also comprise an additional one of each of the emitters at each of the different wavelengths (e.g., ten total emitters).