Knotted LED Filament Structure for 3D Light Distribution
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Solution Overview
Problem
Existing LED filament lighting solutions lack satisfactory spatial light distribution and local brightness, and fail to replicate the aesthetic appeal of incandescent bulbs, while also being difficult to connect and combine effectively.
Innovation Solution
A light emitting device featuring flexible LED filaments with intentional complications such as knots or weavings, where the filaments are connected through looping and tightening, and encapsulated with a polymer material to enhance flexibility and light distribution, allowing for improved spatial light distribution, local brightness, and ease of connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED filaments are arranged in a loose flat plaid-like structure, then the filaments can be easily manufactured, but the spatial light distribution is not satisfactory
Solution Approach 1:
The patent applies curvature by transforming the flat plaid-like structure into a three-dimensional configuration where filaments are arranged in spherical or radial patterns. This curvature enables light to distribute more uniformly in multiple directions, improving spatial light distribution while maintaining manufacturing feasibility through flexible substrate bending.
Solution Approach 2:
The invention transitions from a two-dimensional flat arrangement to a three-dimensional spatial configuration. By arranging filaments in radial or spherical patterns extending in multiple dimensions, the light distribution is enhanced throughout the bulb volume, resolving the contradiction between simple manufacturing and effective light distribution.
2Device complexity
If LED filaments are arranged in a loose flat plaid-like structure, then the structure is simple, but the local brightness is insufficient
Solution Approach 1:
The patent implements local quality by creating regions of higher filament density or specific optical properties in particular areas of the bulb. This allows certain zones to emit more light locally, enhancing brightness in specific directions or regions while keeping the overall structure relatively simple and maintaining manufacturing ease.
3Ease of manufacture
If LED filaments are not connected or in contact with one another, then the filaments are easy to manufacture independently, but the aesthetic appeal and light distribution are reduced
Solution Approach 1:
The invention merges multiple independent filaments into an integrated three-dimensional structure where filaments are positioned to interact optically and spatially. This combining maintains individual filament manufacturing simplicity while creating an aesthetically pleasing interconnected appearance and improved light distribution through the merged structure.
4Ease of manufacture
If LED filaments are not connected or in contact with one another, then the filaments can be manufactured independently, but the spatial light distribution is not satisfactory
Solution Approach 1:
The patent uses dimensional transition from 2D flat arrangement to 3D spatial configuration, allowing independently manufactured filaments to be positioned in radial or spherical arrangements. This three-dimensional positioning enables comprehensive light distribution throughout the bulb volume while preserving the manufacturing independence of individual filaments.
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 light emitting device with enhanced spatial light distribution, local brightness, and aesthetic appeal, making it easier to connect and combine filaments, resulting in a robust and versatile lighting solution with decorative possibilities.
Implementation Method 1
The encapsulant may comprise a luminescent material that is configured to at least partly convert LED light into converted light. The luminescent material may be a phosphor such as an inorganic phosphor and/or quantum dots or rods.
Data Source
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AI summary
A light emitting device (1) comprising at least one LED filament (2) comprising a flexible substrate (3) and a plurality of LED light sources (4) arranged on the flexible substrate (3), and an encapsulation (5a, 5b) encapsulating the plurality of LED light sources (4) and at least a part of one side of the flexible substrate (3), where the at least one LED filament (2) comprises at least one knot (6) in the form of intentional complication in cordage of the at least one LED filament (2), and where the intentional complication in cordage is any one of a fastening made by looping the at least one LED filament (2) on itself or together with a further LED filament and tightening it, and an intentional complication in cordage in which the at least one LED filament (2) is interlaced with at least one further LED filament at right angles to one another.