Sunlight-Mimicking LED Lighting With Reduced Blue Light Exposure

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Solution Overview

Problem

Conventional lighting systems using light emitting diodes (LEDs) can cause eye and skin diseases due to high intensity blue light emission, and they fail to mimic the changing color temperature of sunlight effectively, which is essential for human health and comfort.

Innovation Solution

A lighting apparatus comprising a white light emitting device with a first LED emitting light in the range of 300-420 nm and a second LED emitting light in the range of 605-935 nm, along with a wavelength converter to produce white light, which reduces the irradiance of blue light emission and mimics the color temperature of sunlight, thereby preventing eye and skin diseases and promoting cellular activation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If conventional LED lighting emits high intensity blue light, then illumination efficiency is improved, but eye and skin diseases are caused

Engineering Contradiction:

Improveillumination efficiencyVSAvoideye and skin diseases

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent changes the spectral parameters of LED lighting by using multiple LEDs with different peak wavelengths (440nm, 470nm, 500nm, 530nm, 560nm, 590nm) instead of a single blue LED. This parameter change allows the system to maintain high illumination efficiency while reducing the harmful concentration of blue light at 450nm, thereby preventing eye and skin diseases.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite lighting system combining multiple LED types with different spectral characteristics. By integrating LEDs across the visible spectrum (violet to yellow-green wavelengths), the system creates a composite light output that mimics natural sunlight while eliminating the harmful blue light concentration found in conventional single-LED systems.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If LED lighting uses single wavelength blue light, then device complexity is reduced, but ability to mimic sunlight color temperature changes is lost

Engineering Contradiction:

Improvelighting system structureVSAvoidcolor temperature adjustment

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent segments the single blue light source into multiple LED components, each emitting at a specific wavelength. This segmentation enables independent control of each LED group, allowing the system to dynamically adjust color temperature by activating different combinations of LEDs, thereby mimicking sunlight changes throughout the day.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic color temperature control by enabling the lighting system to adjust the intensity and combination of different wavelength LEDs based on time of day, season, and location. This dynamic adjustment capability allows the system to replicate the natural variation in sunlight color temperature, transitioning from warm tones at sunrise/sunset to cool tones at midday.

Inventive Principle:

Principle #15Dynamics

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 effectively reduces the risk of eye and skin diseases by minimizing blue light exposure while promoting cellular health through the production of nitric oxide and enhanced metabolism, and it dynamically adjusts color temperature to match the natural sunlight changes based on location and time.

Implementation Method 1

a wavelength converter to convert a wavelength of light emitted from the light emitting diode

Methodology Applied

Scientific EffectWavelength conversion: Photoluminescence

Implementation Method 2

at least one second light emitting diode emitting light suitable for producing a cell activating substance, wherein the second light emitting diode emits light having a central wavelength in a range of about 605 nm to about 935 nm

Methodology Applied

Scientific EffectCellular activation through light absorption: Photosynthesis

Data Source

PatentUS11844957B2LED lighting apparatus having sterilizing function

Publication Date: 2023.12.19 SEOUL VIOSYS CO LTD

AI summary

A lighting apparatus is disclosed. The lighting apparatus according to one embodiment of the present disclosure includes: a white light emitting device including at least one first light emitting diode and a wavelength converter to implement white light; and at least one second light emitting diode emitting light suitable for producing a cell activating substance, wherein the first light emitting diode emits light having a central wavelength in a range of about 300 nm to about 420 nm, the second light emitting diode emits light having a central wavelength in a range of about 605 nm to about 935 nm, the wavelength converter includes a plurality of wavelength conversion substances to convert light of the first light emitting diode into white light, the lighting apparatus emits the white light implemented in the white light emitting device and light generated by the second light emitting diode to the outside, and, in irradiance spectrum of the white light implemented in the white light emitting device, irradiance of the central wavelength of light emitted from the first light emitting diode is smaller than that of a peak wavelength of blue light emitted from the wavelength conversion substance.