Variable Gamut Lighting Devices With Dynamic Emitter Control
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Solution Overview
Problem
Conventional solid state lighting devices struggle to provide adjustable gamut area index values and relative gamut values while maintaining a small change in color point and luminous flux, which limits their ability to accurately reproduce colors and meet user preferences for lighting environments.
Innovation Solution
The use of multiple electrically activated emitters, including LEDs and lumiphors, arranged to operate in multiple states to produce different gamut area index values and relative gamut values, with a control circuit adjusting their operation to vary the gamut of the lighting device in response to user inputs or sensors, ensuring color points are on or proximate to the blackbody locus or white body line, and maintaining high color rendering indices and luminous efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional solid state lighting devices use fixed emitter configurations, then device complexity is reduced, but adaptability and versatility are limited
Solution Approach 1:
The patent implements dynamic control of multiple LED emitters with different color temperatures (e.g., 2700K, 5000K, 10000K) through a control circuit that adjusts their operating states in real-time. This allows the lighting device to dynamically vary gamut area index values and relative gamut values while maintaining color points on or proximate to the blackbody locus, transforming a static lighting system into an adaptable one that responds to user inputs or sensor data.
Solution Approach 2:
The lighting device integrates multiple LED emitters with different spectral characteristics into a single unified system that can produce multiple operating states. The control circuit enables one device to serve multiple functions: providing both high CRI Ra (80-90) and high GAI (100-200) lighting, adjusting gamut area index values, and maintaining color rendering across different gamut levels, thereby replacing what would otherwise require multiple separate lighting devices.
2Adaptability or versatility
If multiple emitters are used to achieve variable gamut, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent divides the lighting device into multiple independently controllable LED emitter segments, each with distinct color temperature characteristics. The control circuit independently manages each emitter group, allowing selective activation and intensity adjustment of specific segments to achieve desired gamut area index values and relative gamut values while maintaining overall system coordination.
3Adaptability or versatility
If conventional lighting devices use fixed color temperature, then device complexity is low, but adaptability to user preferences is limited
Solution Approach 1:
The patent incorporates sensors that detect environmental conditions, object colors, or user preferences and feed this information back to the control circuit. The control circuit processes this feedback and automatically adjusts the operating states of multiple LED emitters to optimize gamut area index values and relative gamut values, enabling the lighting device to adaptively respond to changing conditions without requiring manual intervention.
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 approach allows for adjustable gamut lighting that enhances color reproduction and user preference by varying gamut area without significant changes in color point or luminous flux, achieving high gamut area index and color rendering index values while maintaining high luminous efficacy.
Implementation Method 1
Solid state emitters may include lumiphoric materials (also known as lumiphors) that absorb a portion of emissions having a first peak wavelength emitted by the emitter and re-emit light having a second peak wavelength that differs from the first peak wavelength.
Implementation Method 2
Lighting devices with variable gamut... include multiple electrically activated emitters... Solid state emitters such as LEDs... arranged to stimulate emissions of one or more lumiphors
Data Source
AI summary
Lighting devices include multiple emitters (e.g., LEDs, optionally in combination with one or more lumiphors) arranged to be operated in multiple operating states arranged to produce different gamut area index (GAI) or relative gamut (Qg) values, preferably in conjunction with a small or imperceptible change in luminous flux and/or color point. A first emitter or emitter group and a second emitter or emitter group may be separately arranged to produce white light with different gamut areas. Adjustment of operation of emitters may be responsive to a user input element or sensor.