Lighting Device Reducing Blue Light While Maintaining Efficiency
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Solution Overview
Problem
High-efficiency LED lighting devices emit excessive blue light, which can cause eye fatigue, macular degeneration, insomnia, and potential cancer risks due to increased estrogen levels from disrupted melatonin secretion, necessitating a solution that maintains lighting efficiency while reducing blue light emission.
Innovation Solution
A lighting device comprising a combination of a high-efficiency white LED and a natural LED with lower blue light intensity, where the power consumption ratio of the white LED to the natural LED is greater than 1, arranged on a light guide plate to direct and diffuse light, reducing blue light exposure while maintaining high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a high-efficiency white LED is used for lighting, then light efficiency is improved, but blue light emission increases causing harmful effects
Solution Approach 1:
The lighting device is divided into two separate light source modules: a first light source module containing a high-efficiency white LED, and a second light source module containing a natural LED with lower blue light content. This segmentation allows each module to fulfill different functions - the white LED provides high efficiency while the natural LED compensates for blue light reduction, resolving the contradiction between efficiency and blue light emission
2Object-generated harmful factors
If only natural LED is used to reduce blue light, then blue light emission is reduced, but light efficiency decreases
Solution Approach 1:
The patent combines two different LED types into a single lighting device: the high-efficiency white LED and the natural LED with lower blue light content. By merging these two light sources and controlling their power consumption ratio (1:n where n>1), the device achieves both high overall efficiency and reduced blue light emission, as the white LED contributes efficiency while the natural LED suppresses blue light
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 blue light emission by up to 36% while exceeding the reference light efficiency of 100 lm/W, thus addressing health concerns associated with blue light exposure while meeting energy efficiency standards.
Implementation Method 1
a first light source; and a second light source having lower light efficiency than the first light source and having a lower light intensity than the first light source in a blue light wavelength region
Data Source
AI summary
A lighting device capable of maintaining high efficiency while reducing blue light. The lighting device includes: a first light source; and a second light source having lower light efficiency than the first light source and having a lower light intensity than the first light source in a blue light wavelength region, in which power is supplied to the first light source and the second light source so that a ratio of power consumption of the first light source to power consumption of the second light source becomes 1:n, and n is greater than 1.