LED Cluster Foursquare Array for Luminaire Color Mixing
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Solution Overview
Problem
Existing LED luminaire fixtures often suffer from uneven color mixing, leading to undesirable variations in lighting due to directional biases in color hue emission, as the arrangement of LEDs in linear configurations can result in one side emitting a distinct color different from the other, even when the fixture is oriented in three-dimensional space.
Innovation Solution
The arrangement of LED clusters in a foursquare array with differently colored LEDs, where each cluster is positioned differently relative to adjacent clusters, either by rotating every other cluster by 180° or shifting every other cluster by 90°, promotes thorough mixing of color wavelengths across the entire length of the luminaire fixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LEDs are arranged in a linear configuration along an LED strip, then the fixture can be easily manufactured and installed, but the color mixing becomes uneven with directional biases in color hue emission
Solution Approach 1:
The patent applies asymmetry by rotating alternate LED clusters by 180 degrees relative to adjacent clusters. This asymmetric arrangement disrupts the directional bias in color emission, ensuring that no single wavelength dominates from either side of the fixture. The rotation creates an alternating pattern that balances color distribution across the linear structure.
Solution Approach 2:
The patent introduces a rotational dimension to the otherwise linear LED arrangement. By adding the dimension of rotation (0 or 180 degrees) to the linear sequence of clusters, the design achieves three-dimensional color mixing optimization. This dimensional change allows light to be distributed more uniformly in multiple directions, eliminating the planar color bias.
2Stability of the object's composition
If LEDs of different colors are grouped in clusters, then color mixing can be improved, but the arrangement complexity increases
Solution Approach 1:
The patent segments the LED population into discrete clusters, with each cluster containing multiple LEDs of different colors. This segmentation allows for localized color mixing within each cluster while the alternating rotation pattern ensures uniform distribution across the entire fixture. The modular cluster design simplifies the overall arrangement complexity by breaking down the complex multi-color distribution problem into manageable repeating units.
Solution Approach 2:
The patent applies local quality by ensuring each cluster contains a balanced mix of different colored LEDs (red, green, blue, yellow). This local color balance within each cluster, combined with the alternating rotation pattern, ensures that every position along the linear fixture contributes equally to the overall color uniformity, eliminating the need for complex global arrangement patterns.
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 configuration ensures that the color mixing is optimized across the luminaire, eliminating directional biases and providing a well-balanced, three-dimensional lighting effect without any single wavelength dominating the emission from either side.
Implementation Method 1
Light emitting diodes are made from a thin layer of fairly heavily doped semiconductor material and, depending on the semiconductor material used and the amount of doping, when forward-biased an LED will emit light at a particular spectral wavelength
Implementation Method 2
A series or strip of LED clusters may be situated linearly along a suitable substrate, such as a printed circuit board, to provide a strip of LED clusters. The array of any particular cluster is positioned differently in space in relation to the array in an adjacent cluster, which promotes the mixing of the colors of light emitted from the luminaire
Data Source
AI summary
A light fixture apparatus with at least one multi-color light emitting diode (LED) cluster. Each LED cluster preferably includes four differently colored LEDs, or four different color-correlated temperature LEDs, in a single optic defining a foursquare array. A cluster thus arranged thereby promotes thorough mixing of the differing wavelengths of light emitted by the cluster. Further, a plurality of such clusters may be arranged so to enhance or optimize color mixing amongst the plurality of clusters. A series of LED clusters may be situated linearly along a suitable substrate in a luminaire for emitting visible light.