LED Filament Segmentation and Phosphor Layer for 360-Degree Illumination
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Solution Overview
Problem
Traditional LED filaments face challenges in achieving 360° full-angle lighting and color rendering index due to directional lighting, stress concentration during bending, and reduced luminous flux from lower red phosphor conversion rates, leading to instability and inefficiency.
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 structure, and a flexible substrate for bending, ensuring stable operation and improved light emission with a phosphor composition optimized for color rendering and luminous flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LED chips are arranged densely in the filament to improve light output, then luminous flux increases, but stress concentration during bending damages metal wiring and reduces reliability
Solution Approach 1:
The LED filament is divided into multiple LED sections with spacing between them, preventing dense arrangement. This segmentation reduces stress concentration on metal wiring during bending while maintaining adequate light output through optimized section distribution along the filament length.
Solution Approach 2:
Different regions of the filament are designed with different properties: LED sections contain the LED chips and phosphor for light emission, while non-LED sections provide structural support and stress relief. This local differentiation allows dense chip placement in LED sections while maintaining overall filament flexibility and wiring stability.
2Ease of manufacture
If traditional LED directional lighting structure is used to simplify device design, then manufacturing is easier, but 360° full-angle illumination cannot be achieved
Solution Approach 1:
Phosphor materials are applied to convert LED light wavelengths and achieve 360° full-angle illumination. The phosphor coating transforms the directional LED light into omnidirectional emission while maintaining manufacturing simplicity through a straightforward coating process on the filament structure.
3Measurement precision
If red phosphor conversion rate is reduced to improve color rendering index, then color accuracy improves, but luminous flux decreases
Solution Approach 1:
Multiple phosphor materials with different characteristics are combined in the filament. This composite phosphor system achieves high color rendering index by selecting phosphors with complementary emission spectra, while maintaining luminous flux through optimized phosphor ratios and distributions that maximize overall light output.
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 enables the LED filament to emit at least 4 lm of white light per millimeter, maintain temperature stability for 15,000 hours, and achieve a high color rendering index, addressing the limitations of traditional LED lighting in terms of angle and efficiency.
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
Implementation Method 2
each of the LED sections comprising at least two LED chips electrically connected to each other through a wire
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.