LED Lighting Assembly with Non-Homogeneous Diffusor for Homogeneous Output
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Solution Overview
Problem
Conventional LED lighting assemblies face challenges in achieving homogeneous light output due to the concentrated nature of LED light, which can result in a spotty appearance even with diffusers, and thick diffusers compromise efficiency.
Innovation Solution
A lighting assembly with multiple LED elements arranged at a distance, utilizing a diffuser element with non-homogeneous optical properties, featuring varying diffusion portions to counteract inhomogeneous light input, achieved through differences in diffusion particle density or thickness, ensuring continuous or periodic variation for enhanced homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a plurality of LEDs is used to spread light output over a larger area, then the lighting coverage is improved, but the light output becomes inhomogeneous with a spotty appearance
Solution Approach 1:
The patent applies local quality by positioning diffusor elements with specifically optimized properties directly at each LED location. Each diffusor element is tailored to its local position, creating non-uniform local diffusion that compensates for the inhomogeneous light input from individual LEDs, thereby achieving homogeneous overall light output across the entire array.
2Stability of the object's composition
If a thick diffusor element is used to achieve better light homogeneity, then the light output homogeneity is improved, but the overall lighting efficiency is reduced
Solution Approach 1:
The patent uses local quality by implementing diffusor elements with position-dependent optical properties. Each diffusor element's diffusion strength is locally optimized based on its position relative to LEDs, allowing thin diffusors to achieve homogeneous output without the energy losses associated with thick uniform diffusors.
Solution Approach 2:
The patent applies parameter changes by varying the optical properties (such as diffusion coefficient or thickness) of diffusor elements across different positions. This spatial variation in parameters enables efficient light homogenization with thin diffusors, avoiding the energy losses inherent in thick uniform diffusor designs.
3Temperature
If individual LEDs are arranged at a certain distance from each other due to thermal and cost constraints, then the thermal management and cost are improved, but the light output homogeneity deteriorates
Solution Approach 1:
The patent applies local quality by positioning diffusor elements with specifically optimized properties directly at each LED location. Each diffusor element is tailored to its local position, creating non-uniform local diffusion that compensates for the inhomogeneous light input from individually spaced LEDs, thereby achieving homogeneous overall light output across the entire array.
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 provides a significantly homogenized light output with high efficiency, maintaining a compact design and achieving satisfactory homogeneity values, especially in line-shaped illumination, while maintaining a thin diffuser for improved efficiency.
Implementation Method 1
The diffusor element is translucent but not entirely transparent, i.e. light traversing the diffusor element is scattered
Data Source
AI summary
A lighting assembly includes at least two LED elements arranged at a distance from each other. A diffusor element extends over the LED lighting elements. The diffusor element comprises first diffusion portions arranged in front of the LED lighting elements and second diffusion portions arranged in between the first diffusion portions. The first diffusion portions are disposed to cause a stronger optical diffusion than the second diffusion portions, thereby providing a more homogeneous appearance of light emitted from the diffusor element.