LED Filament Lamp Scattering Layout for Uniform Light Distribution
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Solution Overview
Problem
Existing LED filament lamps suffer from non-homogeneous light distribution due to angle-dependent emission characteristics of LEDs and uneven positioning of filaments, leading to dark zones and shadows.
Innovation Solution
Incorporation of light scattering elements that encompass LEDs to alter their spatial distribution, combining light distributions from encompassed and non-encompassed sets to achieve a more uniform output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED filaments are used to replace incandescent lamps, then energy efficiency is improved, but light distribution homogeneity deteriorates due to angle-dependent emission characteristics
Solution Approach 1:
A light scattering element is introduced as an intermediary component between the LED and the surrounding space. This scattering element diffuses the angle-dependent LED light in multiple directions, converting the directional emission into omnidirectional light distribution similar to incandescent lamps, thereby resolving the contradiction between energy efficiency and light distribution homogeneity
2Adaptability or versatility
If multiple LED filaments are positioned to achieve desired lighting patterns, then lighting flexibility is improved, but total light distribution homogeneity deteriorates due to uneven positioning
Solution Approach 1:
The light scattering element is strategically positioned at specific locations where light distribution needs improvement. By applying the scattering effect locally at critical positions, the invention maintains lighting flexibility for different patterns while simultaneously improving overall light distribution homogeneity
3Illumination intensity
If surface structuring methods such as grinding or etching are used to create scattering structures, then light scattering capability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of applying complex surface structuring to the entire LED system, the scattering function is segmented into a separate, dedicated light scattering element. This element can be manufactured using simpler methods and then integrated into the LED assembly, reducing overall manufacturing complexity while maintaining effective light scattering capability
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 design results in an improved, essentially homogeneous total light distribution by scattering elements positioned to balance light intensity across the LED filament lighting device.
Implementation Method 1
configured to scatter light emitted from the encompassed LED(s)
Data Source
Figure 1A~1C
Figure 2A~2D
Figure 3A~4
AI summary
An LED filament lighting device comprising, at least one LED filament, each including a plurality of LEDs mounted on an elongated substrate, at least one light scattering element, each including a light scattering shell surrounding a transparent volume, each light scattering element being arranged to encompass at least one LED of at least one LED filament, and configured to scatter light emitted from the encompassed LED(s), thereby forming a first LED set including at least one LED encompassed by said at least one scattering element, and a second LED set including a plurality of LEDs not encompassed by said at least one scattering element, wherein a light distribution from said first LED set combines with a light distribution from said second LED set to provide an improved total light distribution from said LED filament lighting device.