LED Lighting Device Chromatic Compensation
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Solution Overview
Problem
Existing LED lighting solutions struggle to adjust Correlated Color Temperature (CCT) effectively, often resulting in pinkish hues that deviate from the black body emission curve, especially at high quality lighting applications, and require complex and expensive systems with multiple channels.
Innovation Solution
A lighting device comprising three LED generators - one for 'cold' white light, one for 'warm' white light, and a third for green light - allows for CCT adjustment by mixing their radiations, enabling placement of the color point on the black body emission curve within the CIE 1931 diagram, compatible with standard RGB controllers and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two white LEDs with different CCT values are used to mix light radiation, then CCT adjustment is possible, but the color point deviates from the black body emission curve resulting in pinkish hue
Solution Approach 1:
The patent introduces a third light radiation source with green color to specifically compensate for the color deviation in the green region of the spectrum. This local quality adjustment allows the color point to be moved from the segment connecting two white LED points to the black body emission curve, eliminating the pinkish hue while maintaining CCT adjustment capability.
Solution Approach 2:
The patent combines three different light radiation sources (two white LEDs with different CCTs and one green LED) to create a composite light output. This composite approach enables both CCT adjustment and color accuracy improvement by leveraging the complementary spectral characteristics of the different sources.
2Manufacturing precision
If more sophisticated solutions with multiple channels are used to adjust white light, then color accuracy improves, but device complexity and cost increase
Solution Approach 1:
Instead of using complex multi-channel systems, the patent selectively adds only one green light radiation source to compensate for the specific color deficiency in two-LED mixing systems. This minimal intervention achieves color accuracy improvement without proportionally increasing system complexity.
Solution Approach 2:
The patent uses a simple green LED as a compensation element, which is aĉç, cost-effective, and easily integratable component. This approach avoids the need for expensive sophisticated control systems while achieving the desired color accuracy.
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
Enables high-quality LED lighting with adjustable CCT following the black body emission curve, reducing costs and complexity, while maintaining compatibility with existing RGB controllers, and improving light radiation characteristics without additional compensation channels.
Implementation Method 1
mixing the emitted light radiations, giving rise to a combined radiation having the required CCT value
Implementation Method 2
a third light radiation source (143) for emitting light radiation of a green color
Data Source
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AI summary
A lighting device (10), comprising: - a first light radiation source (141) emitting white light radiation with a first color temperature, - a second light radiation source (142) emitting white light radiation with a second color temperature, different from the first color temperature of the first light radiation source (141), and - a third light radiation source (143) emitting non-white light radiation of a green color, The first (141), second (142) and third (143) light radiation sources, e.g. LEDs, are arranged adjacent to each other on a support member (12), with the light radiation of the first (141), second (142) and third (143) light radiation sources, which are mixed in a white mixing light radiation, having a color temperature between the first and second color temperature.