LED Filament Segmentation for 360-Degree Lighting
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Solution Overview
Problem
Traditional LED filaments face challenges in achieving 360° full-angle lighting, stability of metal wiring during bending, and low color rendering index due to weak red light emission, leading to reduced luminous flux and efficiency.
Innovation Solution
An LED filament design with a conductive section connecting LED sections through a wire, a light conversion layer with a specific phosphor composition, and a flexible substrate for bending, ensuring minimal stress on the conductor and improved light emission across a wide spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional LED chips are fixed on a rigid substrate, then structural stability is improved, but the filament cannot be bent and 360° full-angle lighting cannot be achieved
Solution Approach 1:
The LED filament is divided into multiple LED sections, each containing LED chips mounted on a flexible substrate. This segmentation allows the filament to be bent into various shapes while maintaining the structural integrity of each individual section, resolving the contradiction between structural stability and bending capability.
Solution Approach 2:
A flexible substrate is used to mount the LED chips instead of a rigid substrate. This flexible substrate enables the LED filament to be bent and shaped while still providing mechanical support and electrical connection, achieving both structural stability and adaptability for 360° full-angle lighting.
2Productivity
If LED chips are arranged densely to increase luminous flux, then lighting efficiency is improved, but stress concentration during bending causes metal wiring to break
Solution Approach 1:
The LED filament is divided into multiple LED sections with spacing between them. This segmentation reduces stress concentration on the metal wiring during bending while maintaining high luminous flux through the use of multiple LED chips across different sections, resolving the contradiction between productivity and reliability.
Solution Approach 2:
Different regions of the filament are designed with different characteristics - LED sections have dense chip arrangements for high luminous flux, while conductor sections have appropriate length and flexibility for stress relief during bending, ensuring metal wiring stability.
3Illumination intensity
If red phosphor is added to improve color rendering index, then color quality is improved, but conversion rate decreases leading to reduced luminous flux
Solution Approach 1:
Multiple phosphors including red phosphor, green phosphor, and yellow phosphor are combined in the light conversion layer. This merging of different phosphors achieves good color rendering index through comprehensive spectral coverage while maintaining high overall conversion efficiency, resolving the contradiction between illumination quality and productivity.
Solution Approach 2:
A composite phosphor system is used instead of a single phosphor type. The light conversion layer contains multiple phosphors with different emission characteristics that work together to achieve both high color rendering index and maintained luminous flux through synergistic effects.
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 achieves stable operation with minimal conductor breakage, enhanced color rendering index, and increased luminous flux, emitting at least 4 lm/mm of white light with reduced thermal stress and improved heat dissipation.
Implementation Method 1
a light conversion layer with a top layer and a base layer covering the at least two LED sections, the conductive section and the two electrodes... the top layer includes a phosphor composition that includes a first phosphor, a second phosphor, a third phosphor, and a fourth phosphor
Data Source
AI summary
An LED filament and an LED light bulb applying the same are provided. The LED filament includes a conductive section including a conductor; two or more LED sections connected to each other by the conductive section, and each of the LED sections includes two or more LED chips electrically connected to each other through a wire; two electrodes, electrically connected to the LED section; and a light conversion layer with a top layer and a base layer, covering the LED sections, the conductive section and the two electrodes, and a part of each of the two electrodes is exposed respectively. The LED filament is supplied with electric power no more than 8 W, when the LED filament is lit, at least 4 lm of white light is emitted per millimeter of filament length.