LED Lamp with Remote Phosphor and Diffuser for Omnidirectional Light
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Solution Overview
Problem
Conventional LED lamps face inefficiencies due to heat retention issues and aesthetic concerns with remote phosphor arrangements, and they often produce directional light patterns that do not match the omnidirectional emission of traditional incandescent bulbs.
Innovation Solution
The development of LED lamps with remote wavelength conversion materials and a separate diffusing layer, combined with thermal management features and optical elements, allows for efficient heat dissipation and transformation of directional light into an omnidirectional emission pattern, mimicking the appearance and functionality of incandescent bulbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional LED packages with integrated phosphor are used, then the device complexity is reduced, but heat retention issues occur and aesthetic concerns arise
Solution Approach 1:
The patent divides the LED lamp into separate functional modules: LED chips mounted on a heat dissipation substrate, remote phosphor material positioned away from the LEDs, and a diffusing layer. This segmentation allows heat to be managed at the source while phosphor conversion occurs in a cooler environment, resolving the heat retention problem without requiring complex integrated packages.
Solution Approach 2:
The patent introduces a light guide plate or optical cavity as an intermediary between the LED chips and the phosphor material. This intermediary transports light from the LEDs to the remote phosphor while maintaining thermal separation, enabling both heat management and aesthetic appearance without increasing overall device complexity.
2Temperature
If remote phosphor arrangements are used, then aesthetic concerns are addressed and heat dissipation is improved, but the light emission becomes directional rather than omnidirectional
Solution Approach 1:
The diffusing layer serves multiple functions simultaneously: it scatters light to create omnidirectional emission patterns, provides aesthetic appearance by masking the internal structure, and maintains the thermal management benefits of the remote phosphor arrangement. This multi-functionality resolves the emission pattern issue without compromising heat dissipation.
Solution Approach 2:
The patent uses the diffusing layer to transform the directional light from remote phosphor into omnidirectional emission. The diffusing material scatters light in all directions while maintaining the color characteristics produced by the remote phosphor conversion, thereby achieving uniform illumination without sacrificing the thermal benefits of remote phosphor placement.
3Manufacturing precision
If directional LED emission is used, then the manufacturing precision is simplified, but the light pattern does not match traditional incandescent bulbs
Solution Approach 1:
The patent extracts the light pattern modification function from the LED emitter arrangement itself and places it in a separate optical system consisting of the optical cavity, light guide plate, and diffusing layer. This allows simple, precision-manufactured LED chips to be used while achieving the desired omnidirectional emission pattern through the optical components.
Solution Approach 2:
The optical cavity and diffusing layer act as intermediaries that transform the simple directional output of precision-manufactured LED chips into the complex omnidirectional emission pattern required to match incandescent bulb characteristics. This intermediary approach maintains manufacturing simplicity while achieving the desired light pattern.
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
This solution results in LED lamps that are efficient, reliable, cost-effective, and provide a uniform omnidirectional light emission, addressing heat retention and aesthetic issues while reducing energy consumption and manufacturing costs.
Implementation Method 1
The optical element changes the emission pattern of the LED to a broader emission pattern
Implementation Method 2
The optical element changes the emission pattern of the LED to a broader emission pattern
Implementation Method 3
The phosphor carrier converts at least some of the LED light to a different wavelength
Implementation Method 4
heat dissipation element with a dielectric layer on the heat dissipation element
Data Source
AI summary
Lamps and bulbs are disclosed generally comprising different combinations and arrangements of a light source, a reflective optical element, and a separate diffusing layer. This arrangement allows for the fabrication of lamps and bulbs that are efficient, reliable and cost effective and can provide an essentially omni-directional emission pattern, even with a light source comprised of an arrangement of LEDs. The lamps according to the present invention can also comprise thermal management features that provide for efficient dissipation of heat from the LEDs, which in turn allows the LEDs to operate at lower temperatures. The lamps can also comprise optical elements to help change the emission pattern from the generally directional pattern of the LEDs to a more omni-directional pattern.