Light Source Spectral Control for Display Visibility and Fatigue Reduction
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Solution Overview
Problem
Conventional lighting technologies do not effectively address the issue of reducing fatigue and improving visibility for light sources that are directly gazed at, such as those used in light emitting displays like automobile instrument panels, especially in low brightness or dark environments.
Innovation Solution
A light source with a specific spectral distribution and color purity, utilizing a combination of LED, organic EL, or incandescent lamps with a color filter, that emits light with a high area ratio of 480-540 nm wavelengths, and includes a fluorescent substance layer with YAG and green fluorescent substances to provide high visibility and reduce fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED lighting devices are used for light emitting displays in dark environments, then the display visibility is improved, but the light source causes fatigue to the viewer
Solution Approach 1:
The patent applies parameter changes by precisely controlling the spectral distribution parameters of the LED light source. Specifically, it sets the area ratio of 480-540 nm wavelength region to 15-68% and color purity to 2-50, creating optimal parameters that balance visibility and fatigue reduction. This resolves the contradiction by finding the optimal parameter range that satisfies both requirements.
Solution Approach 2:
The patent uses composite materials by combining multiple fluorescent substances (YAG fluorescent substance and green fluorescent substance) with the blue LED element. This composite approach creates a light source with tailored spectral characteristics that achieve both high visibility and fatigue reduction, resolving the contradiction between these two opposing requirements.
2Illumination intensity
If the area ratio of 480-540 nm wavelength is increased to improve visibility in dark places, then the brightness perception is improved, but the color purity may be compromised
Solution Approach 1:
The patent simultaneously optimizes multiple parameters: the area ratio of 480-540 nm wavelength (15-68%) and color purity (2-50). By defining specific ranges for both parameters rather than maximizing one at the expense of the other, the patent resolves the contradiction between brightness perception and color purity control.
Solution Approach 2:
The combination of YAG fluorescent substance (emitting yellow light) and green fluorescent substance (emitting green light) with the blue LED creates a composite luminescent system that produces a balanced spectrum. This composite approach allows achieving high brightness perception in dark places while maintaining appropriate color purity through the synergistic effect of multiple fluorescent materials.
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 provides a light source that is perceived as bright in dark places, offers high visibility, and minimizes fatigue, suitable for light emitting displays like instrument panels, with adjustable brightness and color characteristics to manage fatigue effectively.
Implementation Method 1
a fluorescent substance layer which has a fluorescence peak in a wavelength range of 470 to 560 nm
Data Source
AI summary
A light source that emits light, wherein, in coordinates in a CIE 1931 chromaticity diagram, the light has a color purity included in a region of 2 to 50 in a region surrounded by a line segment WB and a line segment WG that connect coordinates W (0.33, 0.33) indicating an achromatic color with coordinates B (0.091, 0.133) of 480 nm and coordinates G (0.373, 0.624) of 560 nm on a spectral locus, and the spectral locus, and has an area occupied by a continuous spectral wavelength in a wavelength region of 480 to 540 nm, of 15% or more relative to an area of an overall spectral wavelength of the light source at 380 to 780 nm.