Light-Emitting Device Spectral Control for Natural Color Appearance
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Solution Overview
Problem
Current light-emitting devices prioritize efficiency and power saving over color appearance, leading to unnatural and uncomfortable indoor illumination, especially at lower illuminance levels, where colors appear dull and hues deviate from their natural appearance.
Innovation Solution
An illumination method and light-emitting device that adjust the spectral power distribution to maintain a specific distance from the black-body radiation locus, control saturation differences and hue angles of Munsell color samples, and optimize the luminous efficacy and correlated color temperature to achieve a natural, vivid, and comfortable color appearance similar to outdoor conditions at indoor illuminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light-emitting devices prioritize efficiency and power saving, then energy consumption is reduced, but color appearance becomes unnatural and uncomfortable
Solution Approach 1:
The patent applies parameter changes by adjusting the spectral power distribution parameters of the light source. Specifically, it controls the distance from the black-body radiation locus (Duv) to be within -0.03 to 0.03 and sets the correlated color temperature between 2000K and 10000K. These parameter adjustments enable the light to maintain natural color appearance while achieving high efficiency and power saving, resolving the contradiction between energy efficiency and color quality.
2Use of energy by moving object
If illuminance is reduced for power saving, then energy consumption decreases, but color saturation and vividness deteriorate
Solution Approach 1:
The patent changes the spectral composition parameters rather than simply reducing overall intensity. By controlling Duv within -0.03 to 0.03 and CCT between 2000K and 10000K, the light maintains optimal color saturation and vividness even at lower illuminance levels, achieving both power saving and color quality preservation.
Solution Approach 2:
The patent uses composite light sources combining multiple wavelengths and spectral components. This composite approach ensures that even at reduced illuminance, the light maintains balanced color saturation across different hues, preventing the dull appearance that occurs with simple intensity reduction.
3Ease of manufacture
If spectral power distribution is adjusted for natural color appearance, then color rendering improves, but device complexity increases
Solution Approach 1:
The patent simplifies spectral control by focusing on two key parameters: Duv (distance from black-body locus) and CCT (correlated color temperature). By controlling only these parameters within specific ranges, the system achieves natural color appearance without requiring complex spectral management, thus improving color rendering while limiting device complexity.
4Ease of manufacture
If Duv is controlled within -0.03 to 0.03 and CCT within 2000K to 10000K, then color appearance becomes natural and vivid, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges (Duv: -0.03 to 0.03, CCT: 2000K to 10000K) that balance manufacturing feasibility with color quality. These ranges are wide enough to accommodate normal manufacturing variations while still achieving natural and vivid color appearance, thus reducing the burden of manufacturing precision 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 method and device ensure that colors appear more natural and vivid, with improved visibility of achromatic colors and saturation, even at lower illuminance, compared to traditional methods, providing a comfortable and natural color appearance similar to high-illuminance environments.
Implementation Method 1
the light measured at a position of the objects satisfies (1) a distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377
Data Source
AI summary
To provide an illumination method and a light-emitting device which are capable of achieving, under an indoor illumination environment where illuminance is around 5000 lx or lower when performing detailed work and generally around 1500 lx or lower, a color appearance or an object appearance as perceived by a person, will be as natural, vivid, highly visible, and comfortable as though perceived outdoors in a high-illuminance environment, regardless of scores of various color rendition metric. Light emitted from the light-emitting device illuminates an object such that light measured at a position of the object satisfies specific requirements. A feature of the light-emitting device is that light emitted by the light-emitting device in a main radiant direction satisfies specific requirements.