Blue Light Spectrum Control for Melatonin Suppression
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Solution Overview
Problem
Existing light-emitting devices for biological rhythm control, such as melatonin suppression, face challenges in varying the melatonin suppression effect without altering the color and intensity of the blue light, which is crucial for maintaining consistent visual output in display applications.
Innovation Solution
A device that generates blue light with a control circuit to vary the spectrum based on a control signal, using multiple blue light sources with different predominant wavelengths to achieve distinct photo-biological effects while maintaining identical color and intensity, allowing for instantaneous or gradual transitions between these effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If blue light with a specific wavelength (e.g., 470 nm) is used to maximize melatonin suppression, then the photo-biological effect is strengthened, but the color and intensity of the light become fixed and cannot be varied
Solution Approach 1:
The blue light generation is segmented into multiple independent light sources with different wavelengths (first blue light source at 470 nm, second blue light source at shorter wavelength, third blue light source at longer wavelength). This allows independent control of each source to achieve different photo-biological effects while maintaining consistent color and intensity through coordinated activation of multiple sources.
Solution Approach 2:
The invention changes the spectral parameters (wavelengths) of the blue light by selectively activating different light sources. By adjusting the intensity ratios of multiple blue light sources with different wavelengths, the system achieves varying photo-biological effects (melatonin suppression, alertness) while maintaining substantially identical color and intensity perceptions.
2Adaptability or versatility
If multiple blue light sources with different wavelengths are combined to achieve varied photo-biological effects, then adaptability is improved, but the device complexity increases
Solution Approach 1:
Multiple blue light sources are integrated into a single display device that serves both visual display functions and photo-biological control functions. The same light sources used for display can be selectively activated to achieve different photo-biological effects, making the system multi-functional without requiring separate dedicated light sources.
Solution Approach 2:
The system dynamically adjusts the intensity ratios of different blue light sources based on real-time control signals. The control circuit continuously modulates the output of multiple light sources to achieve desired photo-biological effects while maintaining consistent visual appearance, enabling adaptive control without fixed hardware configurations.
3Adaptability or versatility
If the spectrum of blue light is varied to control melatonin suppression, then the biological effect is enhanced, but the visual appearance (color and intensity) may change
Solution Approach 1:
Different portions of the blue light spectrum are assigned different functions: the first blue light source (470 nm) primarily provides melatonin suppression, while the second and third blue light sources (shorter and longer wavelengths) are used to compensate for color and intensity variations. By locally optimizing each wavelength contribution, the system achieves biological control without compromising visual appearance.
Solution Approach 2:
The control circuit receives feedback about the visual appearance and photo-biological effects, and dynamically adjusts the intensity ratios of different blue light sources accordingly. This feedback mechanism ensures that variations in spectrum do not result in noticeable changes in color or intensity, while still achieving the desired melatonin suppression or alertness effects.
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
Enables the production of the same visual image with different photo-biological effects on melatonin suppression or alertness without observable changes in color or intensity, synchronizable with day-night cycles or biofeedback, ensuring consistent visual appearance and adjustable biological responses.
Implementation Method 1
The light-emitting device has red LEDs, green LEDs, first blue LEDs, and second blue LEDs. The first blue LEDs emit light with a peak at 470 nm, the second blue LEDs emit light with a peak at a shorter wavelength than the first blue LEDs.
Implementation Method 2
a control circuit which varies the spectrum of the blue light dependent on a control signal to control a photo-biological effect of a vertebrate. The photo-biological effect may be a melatonin suppression effect and/or a biological stimulating/alerting effect
Data Source
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AI summary
A device for generating at least blue light comprises a control circuit (4) which receives a control signal (CS) defining a variation of a spectrum of the blue light to control a photo-biological effect of a vertebrate. Therefore, first blue light (BL1) is generated with a first predominant wavelength (PW1) having a first photo-biological effect, or second blue light (BL2) is generated with both a second predominant wavelength (PW2), being shorter than the first predominant wavelength, and a third predominant wavelength (PW3), being longer than the first predominant wavelength; the second blue light (BL2) has a second photo-biological effect different from the first photo-biological effect, while the first blue light (BL1) and the second blue light (BL2) have substantially identical colors and intensities.