White Light Source Spectrum Shaping for Blue Light Hazard Control
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Solution Overview
Problem
Current LED lighting sources emit excessive blue light, disrupting the human daily rhythm and causing blue light hazards due to uneven spectral distributions, which existing lighting systems fail to address effectively.
Innovation Solution
A method for using a white light source with a controlled α-opic irradiance ratio (0.88≤A/B≤1.11) is introduced, where A and B represent the ratio of melanopic and combined cone opic irradiance, ensuring balanced light emission across different color temperatures, achieved through a combination of LED chips and phosphors to flatten the spectral shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED lighting is used to achieve low power consumption and long lifespan, then energy efficiency and durability are improved, but blue light hazard and disruption of daily rhythm occur due to excessive blue light emission
Solution Approach 1:
The patent changes the spectral parameters of LED lighting by combining multiple LEDs with different wavelength characteristics (violet LED at 405-450nm, blue LED at 450-480nm, cyan LED at 480-505nm) with phosphor materials. This parameter change transforms the emission spectrum to reduce excessive blue light while maintaining energy efficiency and illumination performance.
Solution Approach 2:
The patent uses composite light emission approach by combining light from multiple LED types (violet, blue, cyan) with phosphor-converted light. This composite approach creates a balanced spectrum that reduces blue light hazard while maintaining the energy efficiency and long lifespan advantages of LED technology.
2Power
If blue LED is used to achieve high luminous efficiency, then energy conversion efficiency is improved, but spectral distribution becomes uneven with excessive blue light concentration
Solution Approach 1:
The patent segments the white light generation into multiple wavelength components using different LED types (violet, blue, cyan) and phosphor materials. This segmentation distributes the luminous output across a broader spectrum, preventing concentration of energy in the blue region while maintaining overall luminous efficiency.
Solution Approach 2:
The patent merges light emissions from multiple LED sources with different spectral characteristics and phosphor-converted light. This combining approach creates a balanced composite spectrum that maintains high luminous efficiency while achieving uniform spectral distribution across the visible range.
3Use of energy by moving object
If white light is synthesized by combining LED and phosphor, then energy efficiency is maintained, but blue light component becomes dominant disrupting daily rhythm
Solution Approach 1:
The patent introduces dynamic control by independently adjusting the emission intensity of each LED type (violet, blue, cyan) and phosphor components. This dynamic adjustment capability allows optimization of spectral composition to reduce blue light exposure while maintaining energy efficiency and supporting natural daily rhythm patterns.
Solution Approach 2:
The patent changes the operational parameters of the LED-phosphor system by controlling the relative intensity of each light source. This parameter adjustment transforms the spectral output to reduce blue light dominance while preserving energy efficiency and creating a more natural light profile that supports circadian rhythm.
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
This approach provides a comfortable lighting environment that maintains and improves human health by properly managing daily rhythms and enhancing color rendering, allowing for precise control of lighting conditions.
Implementation Method 1
a light emission of an LED is a conversion of electrical energy into light without heat generation inside a semiconductor material
Implementation Method 2
synthesizes white light by combining light emissions of LEDs and phosphors
Data Source
AI summary
Provided are a method for using a white light source, and a white light source, wherein precise control of daily rhythm and pleasant lighting can be safely and easily realized in a place of living such as a general home. An embodiment provides a method for using a white light source. Provided that: amounts of stimulation light emitted from a white light source to the intrinsically photosensitive retinal ganglion cells (ipRGCs) and visual cells of the L cone and M cone, among the visual cells of human, are defined as a melanopic irradiance, an L-cone opic irradiance, and an M-cone opic irradiance, respectively; a ratio of the amounts of the stimulation light is expressed by the following formula (1); and A is the ratio corresponding to the emission spectrum of the white light source, and B is the ratio corresponding to the radiation spectrum of a black body having the same color temperature as the white light source, an amount of stimulation light emitted to the ipRGC is quantitatively changed by changing the emission intensity of the white light source satisfying the following formula (2). Melanopic irradiance/(L-cone opic irradiance+M-cone opic irradiance) (1) 0.88≤A/B≤1.11 (2)