LED Light Source with Cruciform Cluster for Color Mixing
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Solution Overview
Problem
Current light radiation sources face limitations in scalability, color mixing flexibility, and efficiency, particularly in achieving homogeneous light radiation with a wide range of colors and adjustable correlated color temperature, while maintaining high color rendering quality and uniform intensity distribution.
Innovation Solution
A light radiation source comprising a cluster of LED generators with specific emission wavelengths arranged in a cruciform configuration on a substrate, allowing for varying current density and chip distribution to optimize color mixing, using both direct-emitting and phosphor-converted LEDs, with additional generators for enhanced flux and color combinations, and a sacrificial glass cover for heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed configuration of light radiation generators is used, then the device structure is simple, but the color mixing flexibility and scalability are limited
Solution Approach 1:
The light radiation source is divided into multiple independent controllable channels, each corresponding to specific wavelength ranges (blue 443-468nm, cyan 495-510nm, green 515-535nm, red 638-660nm). This segmentation allows flexible combination of different wavelength components to achieve various color outputs while maintaining a modular structure that can be scaled.
Solution Approach 2:
The patent implements dynamic control of light radiation intensity for each wavelength channel through independent driving circuits. The intensity of each channel can be adjusted in real-time to achieve different color temperatures (CCT) and color rendering indices (CRI), transforming a static device into a dynamically adaptable system.
2Adaptability or versatility
If multiple light radiation generators with different emission wavelengths are used, then the color range is expanded, but the difficulty of achieving homogeneous light radiation increases
Solution Approach 1:
Different regions of the light radiation source are assigned specific wavelength generators with optimized spatial distribution. The patent carefully positions generators emitting at different wavelengths to ensure uniform spatial distribution of all color components, achieving homogeneous mixed light radiation across the entire emission area.
Solution Approach 2:
Optical elements such as lenses and reflectors are introduced as intermediaries to redistribute and mix light from multiple wavelength generators. These optical components facilitate uniform mixing of different color components, ensuring homogeneous light output while maintaining the benefits of multiple wavelength sources.
3Power
If the number of light radiation generators is increased, then the light flux is enhanced, but the heat dissipation becomes more difficult
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional spatial distribution of light radiation generators and heat dissipation structures. Multiple generators are positioned at different heights and radial distances from the central axis, creating vertical and radial heat dissipation pathways that enhance thermal management while accommodating higher power densities.
Solution Approach 2:
The modular generator configuration allows replication of optimized generator-substrate-heat sink units. Each module is independently designed for optimal thermal performance, and multiple copies are arranged in space to achieve high total flux while maintaining individual module thermal characteristics.
4Reliability
If light radiation generators with specific emission wavelengths are selected, then the color rendering quality is improved, but the availability of a wide range of colors is reduced
Solution Approach 1:
The patent combines multiple discrete wavelength sources (blue 443-468nm, cyan 495-510nm, green 515-535nm, red 638-660nm) into a single integrated system. By merging these specific wavelength generators with carefully controlled intensity ratios, the system achieves both high color rendering quality (CRI>90) and wide color gamut coverage through additive color mixing.
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 a scalable, high-efficiency light radiation source with a wide range of colors, including saturated hues, achieving color rendering indices comparable to traditional sources, and adaptable to various lighting applications with uniform intensity and specific color combinations without device redesign.
Implementation Method 1
A light radiation source using electrically-powered light radiation generators, such as solid-state light radiation generators, for example, LEDs
Implementation Method 2
the array comprising a cluster of LED light radiation generators arranged according to a general cross-shaped configuration
Data Source
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AI summary
An array (10) of LED light radiation generators arranged on a substrate (12) comprises a cluster (14, 16) of LED light radiation generators (RB, CY, AQ, GR, DR, PCL, PGA) configured to emit light radiation at different emission wavelength ranges. The cluster (14, 16) of LED light radiation generators comprises both direct-emitting LED light radiation generators (RB, CY, AQ, GR, DR) and phosphor-converted LED light radiation generators (PCL, PGA), these generators being individually controllable (C) to vary the intensity of the light radiation emitted thereby. The number of LED light radiation generators in the cluster (14, 16) is greater than the number of the different emission wavelength ranges, so that the cluster (14, 16) comprises : i) first LED light radiation generators (RB, CY, AQ, GR), each of said first LED light radiation generators being the only one to emit light radiation at a certain emission wavelength range, and - ii) second LED light radiation generators (DR, PCL, PGA), each second LED light radiation generator having at least one homologous second LED light radiation generator in the cluster (14, 16) that emits light radiation at a respective common emission wavelength range.