LED Light Scattering via Hybrid Coatings and Fractal Embossing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light sources, such as incandescent bulbs and fluorescent lights, are energy-inefficient and have short lifetimes, while LEDs offer improved efficiency and longevity but struggle with color reproduction and light extraction due to their Lambertian nature and high refractive index materials, leading to challenges in achieving high Color Rendering Index (CRI) and efficient light distribution.
Innovation Solution
The use of organic-inorganic hybrid materials with high refractive indices, combined with fractal embossing and thermoelectric cooling techniques, enhances light scattering and out-coupling from LEDs, improving their efficiency and CRI by creating non-Lambertian light sources and reducing heat-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional light sources (incandescent bulbs, fluorescent lights) are used, then energy efficiency is poor and lifetime is short, but if LEDs are used, then energy efficiency and lifetime are improved but color reproduction and light extraction efficiency deteriorate due to Lambertian nature and high refractive index materials
Solution Approach 1:
The patent segments the light extraction problem by introducing multiple discrete scattering centers (microlenses, prisms, or roughened regions) distributed across the LED package. Each scattering center independently redirects light rays, collectively achieving non-Lambertian beam patterns and improved light extraction without compromising LED energy efficiency
Solution Approach 2:
The patent introduces an intermediary scattering layer or elements between the LED chip and the external environment. This intermediary component (containing microlenses, prisms, or roughened surfaces) mediates the interaction between the high refractive index LED materials and air, enabling improved light extraction and directional control while maintaining the energy efficiency benefits of LEDs
2Loss of energy
If LEDs with high refractive index materials are used, then energy efficiency is improved, but light extraction and color reproduction (CRI) worsen
Solution Approach 1:
The patent segments the optical path by introducing distributed scattering centers that independently manipulate light rays at different locations. This segmentation allows selective enhancement of certain wavelength components and directional control, improving both light extraction efficiency and color reproduction accuracy while preserving LED energy efficiency
Solution Approach 2:
The patent applies local quality by creating regions with different optical properties within the LED package. Specific areas contain scattering centers with tailored geometries and materials optimized for particular wavelength ranges or directional requirements, enabling improved color reproduction (CRI) in specific spectral regions while maintaining overall energy efficiency
3Ease of operation
If Lambertian light sources are used, then light distribution is uniform in all directions, but light extraction efficiency and directional control are poor
Solution Approach 1:
The patent segments the omnidirectional Lambertian emission into multiple discrete directional beams by distributing scattering centers (microlenses, prisms) across the LED package. Each scattering center redirects light into specific angular ranges, collectively achieving improved light extraction efficiency and directional control while maintaining adequate uniformity through distributed arrangement
4Duration of action of stationary object
If LEDs are used to replace conventional light sources, then lifetime is extended from 750-1000 hours to 50,000-70,000 hours, but heat management becomes more critical
Solution Approach 1:
The patent extracts heat from the LED package by introducing thermoelectric cooling elements (Peltier devices) that actively pump heat away from the LED chip. This extraction mechanism removes excess thermal energy, maintaining lower operating temperatures that preserve LED lifetime while enabling higher drive currents for improved light output
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 significantly increases the external efficiency of LEDs, enhances light distribution, and extends their lifespan, making them more energy-efficient and suitable for various applications while maintaining high color accuracy.
Implementation Method 1
enhancing the light scattering ability of the LEDs
Implementation Method 2
providing an organic-inorganic hybrid material on LEDs (which in certain example embodiments may be a high index of refraction material)
Implementation Method 3
enhancing the light scattering ability of the LEDs (e.g., by fractal embossing, patterning, or the like)
Implementation Method 4
improving performance through advanced cooling techniques
Data Source
AI summary
Certain example embodiments of this invention relate to techniques for improving the performance of Lambertian and non-Lambertian light sources. In certain example embodiments, this is accomplished by (1) providing an organic-inorganic hybrid material on LEDs (which in certain example embodiments may be a high index of refraction material), (2) enhancing the light scattering ability of the LEDs (e.g., by fractal embossing, patterning, or the like, and/or by providing randomly dispersed elements thereon), and/or (3) improving performance through advanced cooling techniques. In certain example instances, performance enhancements may include, for example, better color production (e.g., in terms of a high CRI), better light production (e.g., in terms of lumens and non-Lambertian lighting), higher internal and/or external efficiency, etc.