Solid State Lighting Device Adjustable Scotopic Photopic Ratio
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Solution Overview
Problem
Conventional solid state lighting devices face challenges in achieving high scotopic/photopic (S/P) ratio and high Color Rendering Index (CRI) simultaneously, leading to trade-offs in color rendering and energy efficiency, with existing technologies often compromising on either S/P ratio or CRI.
Innovation Solution
The development of solid state lighting devices incorporating multiple LED components with different S/P ratios, allowing for adjustable aggregated S/P ratios and chromaticities through control circuits, enabling tailored light output for various applications while maintaining minimal changes in correlated color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single LED component is used to provide white light, then device complexity is reduced, but the ability to adjust S/P ratio independently from color temperature is lost
Solution Approach 1:
The lighting device is divided into multiple LED components, each emitting light with different S/P ratios. This segmentation allows independent control of each component's output to achieve desired aggregated S/P ratio and color temperature, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The device incorporates dynamic control capability where the intensity of each LED component can be adjusted in real-time. This enables the system to dynamically transition between different operating modes (e.g., circadian rhythm modes, task lighting modes) by changing the relative contribution of each LED component, maintaining adaptability while managing complexity through intelligent control.
2Adaptability or versatility
If multiple LED components with different S/P ratios are used, then adjustable aggregated S/P ratio is achieved, but device complexity increases
Solution Approach 1:
Each LED component is designed to serve multiple functions: providing both illuminance and specific S/P ratio contribution. The control system universally manages all components to achieve multiple objectives simultaneously (color temperature control, S/P ratio adjustment, energy efficiency optimization), reducing the need for separate dedicated components and thereby managing overall device complexity.
Solution Approach 2:
The device utilizes parameter changes in the electrical current supplied to each LED component to adjust their respective outputs. By varying current parameters, the system can precisely control the intensity contribution of each LED, enabling continuous adjustment of aggregated S/P ratio and color temperature without requiring physical reconfiguration, thus managing complexity through electrical control rather than mechanical means.
3Use of energy by moving object
If LED components with high S/P ratio are used, then energy efficiency is improved, but color rendering quality may be compromised
Solution Approach 1:
The lighting device employs a composite approach by combining multiple LED components with different spectral characteristics. This creates a composite light output that integrates the high efficiency benefits of LEDs with high S/P ratios while compensating for color rendering deficiencies through the complementary spectral contributions of other LED components, achieving both energy efficiency and color quality.
Solution Approach 2:
Different LED components are selected with specific local spectral qualities optimized for different functions. Some LEDs are optimized for high S/P ratio and efficiency, while others are optimized for color rendering. The control system strategically activates specific components based on the required lighting conditions, providing local quality optimization for each functional requirement within the unified device.
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 high S/P ratio and CRI in a single lighting device, enhancing energy efficiency and flexibility, with the ability to adjust S/P ratio without significantly altering color temperature, thus providing improved luminous efficacy and user-preferred lighting conditions.
Implementation Method 1
A solid state lighting device may include, for example, at least one organic or inorganic light emitting diode ("LED")
Implementation Method 2
at least one organic or inorganic light emitting diode ("LED") or a laser
Data Source
AI summary
Solid state light emitting devices include multiple LED components separately arranged to generate spectral output having different ratios of scotopic to photopic light (S/P ratios) but similar chromaticities preferably within seven MacAdam ellipses. A light emitting device may be controlled to permit transitioning between different modes of operation of multiple LED components, with aggregated output of different modes having different S/P ratios but similar chromaticities. Multiple LED components of a light emitting device may be simultaneously controlled with different dimming profiles to effect increased color rendering at maximum emissive output of the apparatus, and to effect increased aggregated S/P ratio at minimum emissive output of the device.