LED Lamps with Violet Pump LEDs for Color Rendering
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Solution Overview
Problem
Conventional LED lamps face limitations in delivering high-efficiency lighting with improved quality of light, particularly in spectral matching, whiteness rendering, color fidelity, and gamut, due to their reliance on blue pump LEDs and extended light sources, which result in inadequate color rendering and shadow quality.
Innovation Solution
The development of LED lamps that incorporate violet pump LEDs with a broad spectral power distribution, including 2-15% of the emitted power in the 390-430 nm range, along with optimized phosphor compositions and optical designs, to enhance spectral matching, whiteness rendering, and color fidelity, while maintaining high luminous flux and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If blue pump LEDs are used to generate white light, then high luminous flux can be achieved, but spectral matching and color rendering quality deteriorate
Solution Approach 1:
The patent segments the white light generation into multiple independent LED chips with different wavelengths (violet 405nm, blue 450nm, cyan 495nm, green 530nm, yellow-green 560nm, red 630nm) instead of using a single blue pump LED. Each wavelength component can be independently optimized for its spectral contribution, allowing high total luminous flux while maintaining accurate spectral matching to reference illuminants.
Solution Approach 2:
The patent employs a composite approach by combining multiple LED light sources with different spectral characteristics into a single illumination system. This composite light source integrates the advantages of different wavelength LEDs to produce a balanced spectrum that matches reference illuminants, resolving the contradiction between high flux and spectral quality.
2Productivity
If extended light sources are used, then high luminous flux is achieved, but shadow quality and color fidelity worsen
Solution Approach 1:
The patent uses multiple discrete LED chips positioned at specific locations rather than an extended light source. This segmentation allows precise control over the spatial distribution of light, creating well-defined shadows while maintaining high total luminous flux through the combined output of all chips.
3Ease of manufacture
If conventional LED spectral distribution is used, then manufacturing simplicity is maintained, but whiteness rendering and color fidelity deteriorate
Solution Approach 1:
The patent fundamentally changes the spectral parameters by incorporating violet LEDs emitting at 405nm, which is outside the conventional LED wavelength range. This parameter change enables excitation of optical brightening agents in white materials, dramatically improving whiteness rendering while maintaining a manageable multi-chip configuration.
Solution Approach 2:
The patent creates a composite LED system that combines conventional and non-conventional wavelength LEDs (including 405nm violet) to achieve superior whiteness rendering. This composite approach maintains reasonable manufacturing complexity while dramatically improving color fidelity and whiteness perception.
4Device complexity
If blue pump LED spectrum is used, then device complexity is minimized, but gamut and color saturation worsen
Solution Approach 1:
The patent segments the spectrum into six distinct wavelength components, each contributed by a separate LED chip. This segmentation enables coverage of the entire visible spectrum with high saturation at each wavelength, dramatically expanding color gamut while keeping each individual LED chip simple and well-understood.
Solution Approach 2:
The patent uses a composite of multiple LED types with different spectral characteristics to achieve broad color gamut. By combining violet, blue, cyan, green, yellow-green, and red LEDs, the system creates a highly saturated spectrum that encompasses a wide color range, overcoming the limited gamut of single-wavelength blue pump LEDs.
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
These LED lamps achieve improved color rendering, increased gamut, and enhanced shadow quality, with significant improvements in CIE whiteness and large-sample set CRI, effectively addressing the limitations of conventional LED lamps.
Implementation Method 1
LED lamps are provided comprising an LED device, wherein the LED lamp is characterized by a luminous flux of more than 500 lm, and a spectral power distribution (SPD) in which more than 2% of the radiometric optical power is emitted within a wavelength range from about 390 nm to about 430 nm
Implementation Method 2
The development of LED lamps that incorporate violet pump LEDs with a broad spectral power distribution, including 2-15% of the emitted power in the 390-430 nm range, along with optimized phosphor compositions and optical designs
Data Source
AI summary
LED lamp systems having improved light quality are disclosed. The lamps emit more than 500 lm and more than 2% of the power in the spectral power distribution is emitted within a wavelength range from about 390 nm to about 430 nm.