LED Light Source Apparatus Circadian Action Factor Control
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Solution Overview
Problem
Conventional light source systems struggle to dynamically adjust their spectral composition to meet varying circadian stimulus and blue-light hazard requirements across different environments and times, limiting their ability to provide optimal lighting for health and comfort.
Innovation Solution
A light source apparatus comprising a light-emitting module and a control unit that switches between different light modes, adjusting the proportions of red, green, and blue sub-lights to vary the circadian action factor and correlated color temperature, ensuring the light source can mimic sunlight's spectral characteristics and reduce blue-light hazard while maintaining consistent color temperature perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional light source systems use fixed spectral composition, then device complexity is reduced, but adaptability to different circadian stimulus and blue-light hazard requirements deteriorates
Solution Approach 1:
The light source is segmented into multiple independent LED chips emitting at different wavelengths (e.g., 450nm blue, 530nm green, 630nm red). Each wavelength component can be independently controlled to adjust the overall spectral composition, enabling adaptation to different circadian stimulus requirements while maintaining manageable device complexity through modular design
Solution Approach 2:
The system dynamically adjusts the intensity ratios of different wavelength LED chips based on time of day, season, and environmental conditions. The control unit modifies the emission characteristics in real-time, transforming a static light source into a dynamic system that adapts to varying circadian stimulus and blue-light hazard requirements
2Object-affected harmful factors
If light source adjusts spectral composition to reduce blue-light hazard, then harmful factors are reduced, but illumination intensity may deteriorate
Solution Approach 1:
The system changes the spectral parameters by adjusting the relative intensities of different wavelength components. When blue-light hazard needs reduction, the control unit decreases the 450nm blue component and compensates by increasing other wavelength components (530nm green, 630nm red), thereby reducing blue-light exposure while maintaining adequate overall illumination intensity through parameter optimization
3Adaptability or versatility
If light source changes spectral composition to match sunlight characteristics, then adaptability to natural rhythms is improved, but device complexity increases
Solution Approach 1:
The system implements periodic action by cycling through different spectral compositions that mimic sunlight characteristics at different times of day. The control unit programs temporal patterns where the spectral output follows natural daylight variations, providing adaptability to circadian rhythms through periodic modulation of LED chip intensities according to predetermined temporal schedules
4Adaptability or versatility
If multiple LED chips with different wavelengths are used, then spectral adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system incorporates feedback mechanisms where sensors detect the actual spectral output and provide information to the control unit. The control unit processes this feedback and adjusts the driving currents to each LED chip to compensate for manufacturing variations, thereby achieving precise spectral composition control despite tolerances in LED chip characteristics and reducing the impact of manufacturing precision limitations
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 system provides adaptive lighting that enhances user health by adjusting circadian stimulus and blue-light exposure, aligning with specific needs in different areas and times without altering the perceived color temperature, thus supporting natural circadian rhythms and visual comfort.
Implementation Method 1
a light-emitting module configured to provide a light
Data Source
AI summary
An embodiment of the disclosure provides a light source apparatus including a light-emitting module and a control unit. The light-emitting module is configured to provide a light. The control unit is configured to change proportion of a first sub-light and a second sub-light to form the light so that a circadian action factor (CAF) and a correlated color temperature (CCT) of the light varies along a CAF vs. CCT locus of the light different from a CAF vs. CCT locus of sunlight. A CAF vs. CCT coordinate of one of the first sub-light and the second sub-light is below the CAF vs. CCT locus of sunlight, and a CAF vs. CCT coordinate of the other one of the first sub-light and the second sub-light is above the CAF vs. CCT locus of sunlight. A display apparatus is also provided.