Twisted LED Filament Structure for Omnidirectional Light Output
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Solution Overview
Problem
Conventional LED filament lighting devices have poor light distribution due to their single-sided configuration, leading to inefficient light emission and the need for additional LEDs or transparent substrates to improve light dispersion.
Innovation Solution
A light emitting device featuring a flexible substrate that can be twisted and rotated around a longitudinal axis, with a plurality of LED packages disposed on the substrate to emit light omnidirectionally, thereby overcoming the limitations of single-sided LED configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are mounted on one side of the filament in a single-sided configuration, then the device structure is simple, but the light distribution is poor
Solution Approach 1:
The patent transitions from a single-sided (one-dimensional light emission) configuration to a multi-sided configuration where LEDs are mounted on multiple sides of the filament substrate. This dimensional expansion allows light to be emitted in multiple directions simultaneously, achieving omnidirectional light distribution while maintaining structural simplicity through the use of a single integrated substrate.
2Illumination intensity
If the number of LED filaments is increased to improve light distribution, then the light emission efficiency improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple LED mounting surfaces into a single integrated filament substrate structure. Instead of using multiple separate LED filaments, the invention mounts LEDs on multiple sides of one substrate, merging what would have been separate components into a unified structure. This achieves improved light distribution without proportionally increasing device complexity.
3Illumination intensity
If transparent or translucent filament substrates are used to improve light dispersion, then the light distribution improves, but the aesthetic flexibility is reduced
Solution Approach 1:
The patent applies different optical properties to different regions or aspects of the substrate. The substrate can be opaque or translucent, and the light dispersion is achieved not by the substrate transparency but by the multi-sided LED arrangement. This allows the substrate material to provide aesthetic flexibility (opaque options) while the geometric configuration provides the light dispersion function.
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 flexible substrate configuration allows for improved omnidirectional light emission, reducing light wastage and enabling more efficient light dispersion compared to conventional LED filament devices, while also providing aesthetic flexibility with opaque or less transparent substrates.
Implementation Method 1
The flexible substrate of certain embodiments is configured to radiate heat
Implementation Method 2
The plurality of LED packages disposed on the first substrate surface are configured to emit light outward from the flexible substrate
Implementation Method 3
Light emitting devices may comprise light emitting diodes. Light emitting diodes (also referred to herein as LEDs) are semiconductor devices that emit light when an electric current is passed through them
Data Source
AI summary
An omnidirectional light emitting device is provided. An example device includes a flexible substrate having a substrate length, a first substrate surface, and a second substrate surface. The flexible substrate is configured to be flexibly wrenched about a longitudinal axis that is parallel to the substrate length. The example device further includes a plurality of LED packages disposed on the first substrate surface. Each LED package of the plurality of LED packages is configured to emit light outward from the flexible substrate.