LED Display Lighting Circadian Control Spectral Power
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Solution Overview
Problem
Current LED lamps face challenges in providing white light across a range of correlated color temperatures (CCT) values while maintaining high efficiency, luminous flux, good color rendering, and acceptable color stability, as well as controlling circadian energy performance effectively.
Innovation Solution
The development of LED-based display systems that can generate circadian-inducing and less-circadian-inducing blue light outputs by adjusting spectral power distributions, using combinations of LEDs and luminophoric media to produce white light within specific color points on the 1931 CIE Chromaticity Diagram, allowing for control of circadian energy performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED lamps use multiple LEDs with different peak wavelengths to generate white light across a range of CCT values, then color temperature adjustability is improved, but spectral power distribution control and color rendering performance deteriorate due to gaps between narrow emission bands
Solution Approach 1:
The patent changes the spectral characteristics by using LEDs with broader emission bands and optimizing their peak wavelengths to overlap, thereby filling spectral gaps while maintaining CCT adjustability across different operating conditions
Solution Approach 2:
The patent combines multiple LED types with different spectral characteristics (red, green, blue LEDs with specific peak wavelengths) to create a composite light source that achieves both broad spectral coverage and tunable color temperature
2Productivity
If LED lamps increase luminous flux and efficiency, then energy output is improved, but circadian energy performance control deteriorates due to inability to selectively modulate blue light content
Solution Approach 1:
The patent segments the lighting function into separate controllable channels: one for general luminous flux (using red and green LEDs) and another for circadian regulation (using blue LEDs with specific peak wavelengths), allowing independent optimization of each function
Solution Approach 2:
The patent implements dynamic control of LED drive currents to adjust the spectral power distribution in real-time, enabling the system to modulate blue light content independently while maintaining overall luminous flux and adapting to different circadian requirements
3Use of energy by moving object
If LED lamps use narrow band emission LEDs for high efficiency, then energy conversion efficiency is improved, but color stability and spectral coverage deteriorate due to limited wavelength range
Solution Approach 1:
The patent optimizes the peak wavelengths of individual LEDs (red: 610-650nm, green: 500-540nm, blue: 440-480nm) to ensure their emission bands overlap sufficiently, maintaining color stability across varying drive conditions while preserving the high efficiency of narrow-band emission
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
These systems effectively provide adjustable white light with improved color rendering and circadian control, enhancing user alertness and comfort by regulating circadian rhythms through tailored light emission characteristics.
Implementation Method 1
LED-based lighting channels adapted to generate a circadian-inducing blue light output
Implementation Method 2
semiconductor light emitting devices such as light emitting diodes (LEDs)
Implementation Method 3
combinations of LEDs and luminophoric media to produce white light
Data Source
AI summary
Display systems for displaying digital content. The display systems have one or more LED-based lighting channels adapted to generate a circadian-inducing blue light output in first operational mode and a less-circadian-inducing blue light output in a second operational mode. The circadian-inducing blue light can have a first circadian-stimulating energy characteristic related to the associated first spectral power distributions of light generated in the first operational mode, and the non-circadian-inducing blue light can have a second circadian-stimulating energy characteristic related to the associated second spectral power distribution of light generated in the second operational mode. Disclosure methods of generating digital display content with the display systems described herein. The methods can generate a circadian-inducing blue light output in first operational mode and a less-circadian-inducing blue light output in a second operational mode.