LED Filament Conical Light Distribution Element
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Solution Overview
Problem
LED filament lamps suffer from unsatisfactory light distribution due to their dipolar emission pattern, resulting in low or non-existent light emission at angles parallel to the filament elongation, which limits their decorative and illumination effectiveness.
Innovation Solution
A LED filament arrangement featuring a plurality of LEDs arranged in a linear or non-straight configuration on a carrier, enclosed by a conical-shaped light distribution element made of solid, at least partially translucent material, which refracts and reflects light via total internal reflection to achieve improved light distribution, allowing emission from the apex, sides, and base of the element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If LED filaments are arranged in a linear array to maintain a simple structure and incandescent bulb appearance, then the decorative effect and simplicity are improved, but the light distribution becomes unsatisfactory with low emission at angles parallel to the filament elongation
Solution Approach 1:
The LED filament is divided into multiple discrete LED elements arranged in a linear array, with each LED acting as an independent light source. This segmentation allows the use of individual light distribution elements for each LED, enabling optimized light emission patterns while maintaining the overall linear structure and incandescent bulb appearance.
Solution Approach 2:
A light distribution element is introduced as an intermediary component between the LED and the external environment. This element, having a conical shape and made of translucent material, refracts and reflects light to redirect emission angles, converting the dipolar emission pattern into a more uniform omnidirectional distribution while preserving the simple linear filament structure.
2Illumination intensity
If a light distribution element with conical shape is added to improve light distribution and enable omnidirectional emission, then the illumination effectiveness is improved, but the device complexity increases
Solution Approach 1:
The light distribution element is integrated with the LED filament structure by positioning it at regular intervals along the linear array. Multiple light distribution elements are combined in series along the filament length, creating a unified structure that achieves omnidirectional emission without requiring complex individual components for each LED.
Solution Approach 2:
The conical shape of the light distribution element is optimized by adjusting geometric parameters such as the apex angle and height. By changing these parameters, the element effectively redirects light at different angles through refraction and total internal reflection, achieving uniform omnidirectional emission while maintaining a simple geometric form that does not significantly increase device complexity.
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 enhanced light distribution, enabling spot lighting and omnidirectional output, improving both decorative and illumination capabilities while maintaining a simple and cost-effective design with fewer components for easier fabrication and recycling.
Implementation Method 1
The at least one light distribution element has a conical shape and is configured to at least partially refract, and at least partially reflect by total internal reflection, the light emitted from the at least one LED filament during operation
Implementation Method 2
The at least one light distribution element has a conical shape and is configured to at least partially refract, and at least partially reflect by total internal reflection, the light emitted from the at least one LED filament during operation
Data Source
AI summary
A light emitting diode, LED, filament arrangement (100), comprising at least one LED filament (120) comprising an array of a plurality of light emitting diodes (140), LEDs, is provided. The LED filament arrangement comprises at least one light distribution element (200a, 200b) comprising a solid, at least partially translucent material at least partially enclosing the at least one LED filament. The at least one light distribution element has a conical shape and is configured to at least partially refract, and at least partially reflect by total internal reflection, the light emitted from the at least one LED filament during operation.