LED Array Stage Lamp Wavelength Filtering for High CRI
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Solution Overview
Problem
Conventional LED light sources with limited primary colors, such as red, blue, and green, fail to achieve a high color rendering index, particularly in applications requiring white light with a color rendering index over 85, due to their non-continuous spectrum.
Innovation Solution
A light emitting device comprising multiple LED arrays with blue, green, and red LEDs, along with their respective phosphor LEDs, combined using a wavelength-based light combination device with specific filter plates to broaden the spectrum, ensuring a color rendering index of over 85.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LED arrays with limited primary colors (red, green, blue) are used, then the device complexity is low and energy efficiency is high, but the color rendering index is insufficient (below 85) due to non-continuous spectrum
Solution Approach 1:
The patent divides the LED system into multiple independent LED arrays, each emitting light in specific wavelength ranges. By segmenting the light sources into distinct spectral components and combining them through optical elements, the system achieves a continuous spectrum that improves color rendering index while maintaining manageable device complexity through modular architecture
Solution Approach 2:
The patent combines light from multiple LED arrays with different spectral characteristics (red, green, blue primary colors) to create a composite light output. This composite approach merges discrete spectral lines into a continuous spectrum, enabling high color rendering index (above 85) while preserving the energy efficiency and controllability advantages of individual LED sources
2Reliability
If multiple LED arrays with different wavelengths are combined, then the spectrum is broadened and color rendering index improves, but the device complexity and optical system complexity increase
Solution Approach 1:
The patent employs optical elements such as dichroic mirrors and beam combiners that serve multiple functions: they reflect specific wavelength ranges, transmit other wavelengths, and combine multiple light beams into a single output. This multi-functionality reduces the need for separate optical components for each LED array, thereby broadening the spectrum and improving color rendering index while controlling optical system complexity
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 effectively broadens the spectrum of the combined light, achieving a high color rendering index of over 85 while minimizing light loss, making it suitable for applications like stage lighting and photography.
Implementation Method 1
the first filter plate has an optical property that reflects light with wavelengths below or equal to λ1 and transmits light with wavelengths above λ1
Implementation Method 2
the second filter plate has an optical property that transmits light with wavelengths below or equal to λ2 and reflects light with wavelengths above λ2
Implementation Method 3
A wavelength-based light combination device, which includes a first filter plate and a second filter plate... the combined light of the three LED arrays can cover a wider spectrum
Data Source
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AI summary
Disclosed are a light-emitting device and a stage lamp system, the device comprising a first LED array (310, 710, 810), a second LED array (320, 720, 820), a third LED array (330, 730, 830) and a wavelength light combination device (340, 740, 840). The first LED array (310, 710, 810) comprises blue LEDs (311) used for emitting first light rays. The second LED array (320, 720, 820) comprises yellow fluorescent LEDs (321) or green fluorescent LEDs and green LEDs (322) used for emitting second light rays. The third LED array (330, 730, 830) comprises red LEDs (331) and amber LEDs (332) used for emitting third light rays. The second light rays are at least partly emitted into the wavelength light combination device (340, 740, 840). The wavelength light combination device (340, 740, 840) comprises a first filter (341, 741) and a second filter (342, 742). The first filter (341, 741) reflects light the wavelength of which is less than or equal to λ1 and transmits light the wavelength of which is greater than λ1, and the second filter (342, 742) transmits light the wavelength of which is less than or equal to λ2 and reflects light the wavelength of which is greater than λ2, where 470 nm ≤ λ1 ≤ 500 nm, 560 nm ≤ λ2 ≤ 590 nm. The first filter (341, 741) makes a reflected part of the first light rays and a transmitted part of the second light rays emit in a first direction. The second filter (342, 742) makes a transmitted part of the second light rays and a reflected part of the third light rays emit in the first direction. The light-emitting device and the stage lamp system can emit a white light with a high colour rendering index.