LED Lighting Device with Spaced Luminescent Materials
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Solution Overview
Problem
Current lighting technologies face challenges in providing energy-efficient, uniform, and low-glare lighting with desirable color temperature and high Color Rendering Index (CRI) for general illumination, especially in large areas like troffer lights, where access is difficult and change-out costs are high.
Innovation Solution
A lighting device incorporating a combination of luminescent materials spaced from light sources and light control elements, such as volumetric light control structures and surface features, to achieve uniform light distribution and color consistency, using solid state light emitters like LEDs that emit different colors, and luminescent materials to produce white light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If solid state light emitters (LEDs) are used to improve energy efficiency and lifespan, then energy consumption decreases and lifespan increases, but uniform light distribution and low glare are difficult to achieve
Solution Approach 1:
The patent applies local quality by varying the spatial distribution of luminescent materials and light control elements across different regions of the lighting device. Different areas have different concentrations and types of luminescent materials to optimize light extraction and distribution locally, achieving uniform overall illumination while maintaining LED energy efficiency
Solution Approach 2:
The patent introduces luminescent materials as intermediary elements between the LED light sources and the final light output. These materials convert and redistribute the light from point-source LEDs into a more uniform diffuse pattern, reducing glare while preserving the energy efficiency of solid-state lighting
2Reliability
If multiple luminescent materials are used to achieve high CRI and color temperature control, then color rendering improves, but device complexity increases
Solution Approach 1:
The patent combines multiple luminescent materials with different emission characteristics into a single integrated lighting device. By merging red, green, and blue luminescent materials (or phosphors) with the LED array, the device achieves high CRI and tunable color temperature without requiring separate lighting fixtures for different color requirements
Solution Approach 2:
The patent makes the lighting device universal by enabling it to provide multiple color temperatures and high color rendering through the combination of luminescent materials. This multi-functionality allows a single device design to serve various lighting applications (warm white, cool white, high CRI) without increasing structural complexity
3Illumination intensity
If light control elements are added to reduce glare and improve uniformity, then light distribution improves, but manufacturing complexity increases
Solution Approach 1:
The patent employs thin film luminescent materials and flexible light control elements that can be applied directly to the lighting device structure. These thin films are easier to manufacture and integrate compared to rigid optical components, reducing manufacturing complexity while achieving uniform light distribution and glare reduction
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
The solution ensures excellent light level uniformity and color consistency across large areas, reducing glare and extending the lifespan of lighting devices while minimizing maintenance costs, particularly in hard-to-reach locations.
Implementation Method 1
at least a first luminescent material spaced from the first light source
Implementation Method 2
luminescent materials to produce white light
Implementation Method 3
light control elements, such as volumetric light control structures and surface features, to achieve uniform light distribution
Data Source
AI summary
A lighting device, comprising at least a first light control element, at least a first light source positioned so that at least a portion of light emitted by the first light source passes through at least a portion of the first light control element and at least a first luminescent material, at least a portion of the first luminescent material being spaced from the first light source, the first luminescent material being positioned so that at least a portion of light emitted by the first light source excites at least a portion of the first luminescent material.