Lighting Device Using Phosphor-Converted LED for Mesopic Visibility
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Solution Overview
Problem
Existing lighting devices do not effectively improve visibility in mesopic vision environments while reducing power consumption and component complexity.
Innovation Solution
A lighting device utilizing two or less LED light sources emitting short and long wavelength bands, with an output varying unit that decreases the long wavelength band output during power interruptions, utilizing a backup power supply and a fluorescent body to enhance visibility and reduce component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If three LED light sources having different wavelengths are used to improve visibility under mesopic vision environment, then visibility is improved, but the number of components increases
Solution Approach 1:
The patent combines multiple wavelength functions into a single LED light source by using a phosphor conversion approach. A blue LED excites multiple phosphors (yellow phosphor and orange phosphor) to generate the required spectral components, thereby achieving the visibility improvement function with fewer physical components while maintaining the beneficial spectral characteristics for mesopic vision
2Illumination intensity
If multiple LED light sources are used to achieve spectral control, then visibility under mesopic vision is improved, but power consumption increases
Solution Approach 1:
The patent merges multiple light generation functions into a single LED driver circuit that controls one LED light source with phosphor conversion. This eliminates the need for multiple independent LED drivers and power management circuits, thereby reducing overall power consumption while maintaining the spectral control capabilities needed for improved mesopic vision visibility
3Illumination intensity
If three types of LED light sources are used for spectral control, then visibility is improved, but the device becomes more complex to control
Solution Approach 1:
The patent consolidates control functions by using a single LED driver circuit to control one LED light source that generates multiple wavelength components through phosphor excitation. This merging approach simplifies the control architecture compared to managing three separate LED light sources, reducing control complexity while preserving the spectral control benefits for mesopic vision enhancement
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 device improves visibility by activating the short wavelength LED source during power failures, reduces power consumption, and minimizes the number of components, maintaining sufficient color rendering and reducing discomfort during chromatic adaptation.
Implementation Method 1
an illumination unit (11) including two LED light sources (21, 22)
Implementation Method 2
A lighting device utilizing two or less LED light sources emitting short and long wavelength bands, with an output varying unit that decreases the long wavelength band output during power interruptions, utilizing a backup power supply and a fluorescent body to enhance visibility
Data Source
AI summary
A lighting device is provided with an illumination unit including two or less LED light sources. The illumination unit uses the two or less LED light sources to emit light of a short wavelength band and light of a long wavelength band. An output varying unit functions to vary an output of at least the long wavelength band light. When the output varying unit receives a varying signal, the output varying unit functions to decrease the output of at least the long wavelength band light.