Three-Band Light Spectrum Control for Low-Light Color Acuity
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Solution Overview
Problem
Existing light generating systems fail to maintain color gamut and visual acuity at low light levels, leading to reduced color discrimination and increased safety risks, which cannot be predicted by current light quality parameters.
Innovation Solution
A light generating system with a specific spectral power distribution across three emission bands, controlled to maintain correlated color temperature and adjust color point with radiant flux changes, preserving color gamut and enhancing visual acuity without increasing illumination levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If illumination levels are increased to maintain color gamut and visual acuity at low light conditions, then color discrimination ability improves, but energy consumption increases and light pollution worsens
Solution Approach 1:
The patent changes the spectral parameters of the light source by adjusting the radiant flux in specific wavelength bands (445 nm, 541 nm, 614 nm) to maintain color gamut and visual acuity at low illumination levels without increasing overall energy consumption. This involves dynamically modifying the spectral power distribution based on ambient light conditions
Solution Approach 2:
The light generating system dynamically adjusts its spectral power distribution in response to changing ambient light conditions and illumination levels. The system modifies the radiant flux in different wavelength bands to maintain optimal color perception and visual acuity across varying operational conditions
2Illumination intensity
If conventional LED white light sources are used to provide high radiant power, then illumination intensity improves, but color gamut and visual acuity at low light levels deteriorate
Solution Approach 1:
The patent applies local quality by concentrating radiant power in specific wavelength bands (445 nm, 541 nm, 614 nm) that are most effective for maintaining color gamut and visual acuity at low light levels. Instead of uniform spectral distribution, the system optimizes power distribution in critical spectral regions
Solution Approach 2:
The system modifies the spectral power distribution parameters to enhance color gamut performance. By adjusting the centroid wavelengths and full width half maximum values of the emission bands, the system maintains superior color rendering and visual acuity characteristics
3Measurement precision
If current light quality parameters (CRI, CCT, chromaticity coordinates) are used to evaluate light sources, then photopic vision performance is assessed, but mesopic vision effects cannot be predicted
Solution Approach 1:
The patent implements dynamic control of spectral power distribution that adapts to different lighting conditions (photopic and mesopic). The system adjusts radiant flux in specific wavelength bands based on ambient light levels, enabling it to maintain optimal performance across varying vision regimes
Solution Approach 2:
The approach segments the visible spectrum into specific wavelength bands (445 nm, 541 nm, 614 nm) that are independently controlled. This segmentation allows targeted optimization of spectral power distribution to address both photopic and mesopic vision requirements
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 system maintains color gamut and visual acuity at low light levels, improving safety and reducing energy consumption by dynamically adjusting spectral power distribution.
Implementation Method 1
The light generating system may comprise a blue semiconductor light source and a yellow phosphor, wherein the blue semiconductor light source and the yellow phosphor are arranged in a co-planar configuration
Implementation Method 2
a blue semiconductor light-emitting element, a green phosphor, and a red phosphor
Data Source
AI summary
The invention provides a light generating system (1000) configured to generate in a first operational mode of the light generating system (1000) system light (1001), wherein: the system light (1001) in the first operational mode has a spectral power distribution with at least 85% of the spectral power in three emission bands (111,121,131) comprising (i) a first emission band (111) having a centroid wavelength of 445 nm +/−25 nm and having a full width half maximum of at maximum 25 nm, (ii) a second emission band (121) having a centroid wavelength of 541 nm +/−25 nm and having a full width half maximum of at maximum 150 nm, and (iii) a third emission band (131) having a centroid wavelength of 614 nm +/−25 nm and having a full width half maximum of at maximum 25 nm; in the first operational mode the light generating system (1000) is configured to control the spectral power distribution of the system light (1001) in dependence of a radiant flux of the system light (1001) while maintaining a correlated color temperature of the system light (1001) within +/−10% of a predetermined correlated color temperature value; and in the first operational mode the light generating system (1000) is configured to shift a color point (1010) of the system light (1001) towards a lower Duv with decreasing radiant flux of the system light (1001) or to shift the color point (1010) of the system light (1001) towards a higher Duv with increasing the radiant flux of the system light (1001).