LED Color Matching Box for Stable Class A D65 Simulation
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Solution Overview
Problem
Existing color matching observation boxes using halogen tungsten lamps struggle to maintain stable spectral power distribution over time, leading to inconsistent metamerism indices and reduced accuracy, while LED-based solutions fail to achieve the CLASS A requirement of CIE standard D65 daylight sources.
Innovation Solution
A color matching observation box utilizing LED lamp beads with specific wavelength ranges and hybrid fluorescent powders, combined with aluminum substrates and reflective structures, to simulate D65 daylight with a CLASS A metamerism index, enhanced by UV lamps and fluorescent lamps for precise light simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If halogen tungsten lamps with light filters are used to simulate D illuminant, then the initial spectral power distribution can reach Level A metamerism index, but the stability deteriorates over time and the metamerism index increases to Level B or C
Solution Approach 1:
The patent changes the fundamental parameters of the light source by replacing halogen tungsten lamps with LED chips operating at different wavelengths (430-480nm blue/violet LEDs). This parameter change enables stable spectral power distribution that maintains Level A metamerism index over time, eliminating the degradation issue inherent in thermal radiation sources combined with optical filters.
Solution Approach 2:
The patent employs composite material strategy by combining multiple LED chip types (blue 450nm, violet 430nm) with carefully selected phosphor materials (yellow phosphor, red phosphor, green phosphor). This composite approach creates a stable spectral power distribution that achieves and maintains Level A metamerism index, overcoming the limitations of single-material solutions.
2Measurement precision
If multiple narrow-waveband LEDs are combined to simulate D light source, then the spectral distribution can approach CIE standard, but the spectral curve becomes non-smooth with significant main peak energy
Solution Approach 1:
The patent applies local quality principle by strategically placing different wavelength LED chips (violet 430nm, blue 450nm) at specific locations and using phosphors with targeted emission characteristics. The yellow phosphor, red phosphor, and green phosphor are positioned and selected to fill spectral gaps locally, smoothing the overall spectral curve while maintaining accuracy against CIE standards.
Solution Approach 2:
The patent introduces phosphor materials as intermediary elements that convert the discrete spectral lines from narrow-waveband LEDs into a continuous, smooth spectrum. The phosphors act as mediators that absorb LED emission and re-emit across broader wavelength ranges, transforming the spiky spectral profile into a smooth curve that accurately represents D illuminant characteristics.
3Use of energy by moving object
If full-spectrum LEDs are used to simulate D light source, then power consumption is reduced, but the CIE standard metamerism index cannot reach Level A with a single LED type
Solution Approach 1:
The patent segments the single full-spectrum LED approach into multiple discrete LED chip types (blue 450nm, violet 430nm) each optimized for specific wavelength ranges. This segmentation allows precise control over spectral power distribution across different regions of the spectrum, enabling Level A metamerism index achievement while maintaining the energy efficiency advantages of LED technology.
Solution Approach 2:
The patent creates a multi-functional LED assembly where different LED chip types and phosphor combinations work together to simultaneously achieve multiple objectives: energy efficiency, smooth spectral curve, accurate CIE standard compliance, and Level A metamerism index. The universal design integrates these functions into a single coordinated system rather than requiring separate solutions for each requirement.
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 achieves stable D65 daylight simulation meeting CLASS A CIE standards with improved power efficiency and extended lifespan, reducing power consumption by 95% and extending service life to 8,000 hours compared to traditional halogen tungsten lamps.
Implementation Method 1
Each of the lamp beads comprises a purple LED chip, a blue LED chip and hybrid fluorescent powder
Implementation Method 2
the hybrid fluorescent powder comprises blue fluorescent powder, yellow fluorescent powder, green fluorescent powder, red fluorescent powder and near-infrared fluorescent powder
Implementation Method 3
combined with aluminum substrates and reflective structures
Data Source
AI summary
A color matching observation box for an LED standard light source comprises a box body, wherein an opening is formed in one side of the box body, an observation chamber is formed by the internal space of the box body, and a standard light source is disposed at the top of the observation chamber and comprises multiple lamp beads; and each of the lamp beads comprises a purple LED chip with a wavelength of 410 nm-430 nm, a blue LED chip with a wavelength of 440 nm-460 nm, and hybrid fluorescent powder. The color matching observation box may be provided with two groups of fluorescent lamps and one group of UV lamps, wherein the UV lamps can be used separately or in combination with other light sources.