Color Temperature Reducing Films for Human-Friendly Light Sources
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Solution Overview
Problem
Existing lighting devices, particularly those using LEDs, emit blue light that can cause eye strain, fatigue, and disrupt melatonin production, leading to issues like insomnia and emotional disorders, as conventional light filters only reduce short-wavelength light without transforming it into a human-friendly spectrum.
Innovation Solution
A human body-friendly light source is created by stacking color temperature reducing films, comprising a polymer substrate and light conversion particles, on the lighting unit's emission surface, which gradually converts the light to an orange-white or orange-red spectrum with a color temperature between 1,000-2,500K, positioning it near the Planckian locus in a CIE chromaticity diagram.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional light filters are used to filter out short-wavelength light (blue light), then melatonin suppression is reduced, but the light is not transformed into a human-friendly spectrum and remains far from the Planckian locus
Solution Approach 1:
The patent converts the harmful short-wavelength blue light into beneficial long-wavelength orange-red light through down-conversion phosphors. Instead of merely filtering out harmful wavelengths, the invention transforms them into useful wavelengths that are friendly to human physiology, achieving both harm reduction and benefit creation simultaneously.
Solution Approach 2:
The patent changes the spectral parameters of the emitted light by using phosphor materials with specific emission characteristics. By selecting phosphors with peak wavelengths between 580-650nm and controlling their emission spectra, the light source achieves color temperatures of 1000-3000K and positions close to the Planckian locus, fundamentally altering the light's properties to be human-friendly.
2Object-affected harmful factors
If multiple color temperature reducing films are stacked to convert light to orange-white or orange-red spectrum, then the light becomes human body-friendly with reduced melatonin suppression, but the device structure becomes more complex
Solution Approach 1:
The patent merges multiple light conversion functions into a single integrated phosphor layer. Instead of stacking multiple separate films, the invention combines red, green, and blue phosphors in one layer that work together to convert the blue LED light into a composite orange-red spectrum, achieving the same effect with simpler structure.
Solution Approach 2:
The patent uses composite phosphor materials containing multiple types of phosphors (red-emitting, green-emitting, and blue-emitting) mixed together in a single layer. This composite approach allows simultaneous achievement of color temperature reduction and spectrum shaping without requiring multiple separate film stacks.
3Illumination intensity
If blue light is emitted for video/image displaying on 3C products, then broad array of colors can be reproduced, but blue light penetrates macular pigment and causes age-related macular degeneration or damage
Solution Approach 1:
The patent converts the harmful blue light that causes macular damage into beneficial orange-red light that is safe for eye health. By using down-conversion phosphors, the invention transforms the very wavelength that penetrates macular pigment into wavelengths that do not cause such damage, while still maintaining good color reproduction capabilities.
Solution Approach 2:
The patent fundamentally changes the color of the emitted light from blue (450-480nm) to orange-red (580-650nm) through phosphor conversion. This color change eliminates the harmful effects of blue light on macular pigment while preserving the ability to display a broad array of colors through careful phosphor selection and mixing ratios.
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
This solution effectively reduces melatonin suppression sensitivity and extends the maximum permissible exposure time for the retina, converting the light into a human-friendly spectrum that is less harmful, as demonstrated by exponential data showing a decrease in melatonin suppression and an increase in permissible exposure time with increasing film stacks.
Implementation Method 1
at least one color temperature reducing film, being connected to a light emission surface of the lighting unit, so as to apply a color temperature reducing process to a light outputted from the light emission surface
Data Source
AI summary
Disclosures of the present invention describe a human body-friendly light source constituted by at least one lighting unit and a plurality of color temperature (CT) reducing films stacked to each other. The CT reducing films are connected to a light emission surface of the lighting unit, so as to apply a color temperature reducing treatment to a light emitted from the lighting unit. Exponential data have proved that, two or more stacked CT reducing films exhibit an apparent color temperature reducing effect on the light. Exponential data have proved that, with the increasing of the stack numbers of the CT reducing films, the light is concerted to an orange-white light with color temperature in a range of 1,000-2,500 K, so as to make a sensitivity of melatonin suppression in response to the light be getting lower.