Radial Multi-Color LED Emitter Module for Tunable Color Temperature
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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 substrate-mounted array of emitters, each emitting a different wavelength, arranged in a specific geometric pattern under a dome, allowing for precise control of color and intensity through a series-coupled configuration and feedback mechanisms.
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 range and color rendering capability are improved, but the device complexity and manufacturing precision requirements increase
Solution Approach 1:
The light source is divided into multiple independent emitter components (red, green, blue, yellow LEDs) that can be individually controlled. Each emitter is mounted separately on the substrate and can be driven with different currents to achieve precise color temperature adjustment across a wide range from warm white to cool white.
Solution Approach 2:
The multi-color LED package serves multiple functions simultaneously: it can produce different color temperatures (warm white, neutral white, cool white), adjust brightness levels, and maintain consistent color rendering index. The same emitter array can be controlled to achieve various lighting effects including circadian rhythm regulation and mood lighting.
2Stability of the object's composition
If multiple differently-colored emitters are combined within the same package, then the color rendering index consistency is improved, but the manufacturing precision and alignment requirements increase
Solution Approach 1:
Multiple emitters of different colors (red, green, blue, yellow LEDs) are merged into a single integrated package mounted on one substrate. The emitters are positioned within the same housing and enclosed by a common lens structure, ensuring consistent optical path and stable color rendering across all emitted light.
Solution Approach 2:
Each emitter is positioned at specific locations on the substrate with controlled spacing and orientation. The lens structure is designed with specific optical properties to uniformly distribute and combine the light from different emitters, ensuring consistent color rendering index while allowing individual emitter optimization.
3Adaptability or versatility
If different drive currents are applied to differently-colored emitters to generate various color temperatures, then the adaptability to different lighting applications is improved, but the control complexity and feedback mechanism requirements increase
Solution Approach 1:
The light source employs dynamic control of drive currents for each emitter type. By independently adjusting the current supplied to red, green, blue, and yellow LEDs, the system can dynamically change color temperature from warm white to cool white and adjust brightness levels to match different lighting applications in real-time.
Solution Approach 2:
The control system incorporates feedback mechanisms to monitor the actual light output and color temperature, comparing it with target values and adjusting drive currents accordingly. This feedback control ensures accurate color temperature regulation and maintains consistent color rendering index across different operating conditions.
4Stability of the object's composition
If a geometric pattern arrangement of emitters is used under a dome, then the optical performance and color mixing uniformity are improved, but the manufacturing precision and assembly complexity increase
Solution Approach 1:
The emitters are arranged in an asymmetric geometric pattern on the substrate rather than a simple symmetric grid. This asymmetric arrangement, combined with the dome lens structure, optimizes the optical mixing of different colored lights to achieve uniform color distribution while managing the complexity of precise positioning.
Solution Approach 2:
A dome-shaped lens structure is used to enclose and uniformly distribute the light from the geometrically arranged emitters. The curved surface of the dome provides uniform optical path lengths and improves color mixing uniformity, while the spherical geometry simplifies the overall assembly process compared to flat or complex optical structures.
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 tunable LED lighting with precise control over color temperature and brightness, enhancing versatility and consistency across various lighting conditions.
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).