Light Emitting Apparatus Flat Beam Profile Thermal Quenching
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Solution Overview
Problem
Current light emitting apparatuses face inefficiencies in light conversion due to inhomogeneous heating of light converting members, leading to thermal quenching and reduced brightness, especially when using high intensity light sources like LEDs or lasers.
Innovation Solution
A light emitting apparatus comprising a high intensity light source, a beam shaping optical element that redistributes the light into a spatially flat beam profile, and a light converting member, which avoids inhomogeneous heating by ensuring a homogeneous light distribution, thereby increasing conversion efficiency and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a high intensity light source is used to increase brightness, then the light output increases, but inhomogeneous heating of the light converting member occurs leading to thermal quenching and reduced conversion efficiency
Solution Approach 1:
The patent applies local quality by redistributing the light intensity spatially across the light converting member. The beam shaping optical element creates a non-uniform intensity distribution that compensates for the non-uniform thermal properties and light conversion characteristics of different regions of the light converting member, thereby achieving more uniform heating and preventing thermal quenching in high-intensity regions
Solution Approach 2:
The patent changes the spatial distribution parameter of the light intensity by using a beam shaping optical element. This element transforms the initially uniform or Gaussian intensity profile into a customized spatial distribution that optimizes the thermal load across the light converting member, maintaining high overall intensity while preventing localized thermal quenching
2Temperature
If the light converting member is placed on a static heat sink to improve heat dissipation, then thermal management improves, but the inhomogeneous light distribution still causes localized thermal quenching
Solution Approach 1:
The patent addresses the limitation of static heat sinks by applying local quality through spatially varying light intensity distribution. Even with uniform heat dissipation capability, the customized intensity profile ensures that regions with higher light absorption receive proportionally lower intensity, preventing localized thermal quenching that cannot be solved by heat sinks alone
3Device complexity
If the light beam has a Gaussian intensity distribution from the light source, then the light source structure is simple, but the light distribution on the light converting member is inhomogeneous causing thermal quenching
Solution Approach 1:
The patent introduces a beam shaping optical element as an intermediary component between the light source and the light converting member. This mediator transforms the Gaussian intensity distribution into a customized spatial profile that optimizes heat distribution across the light converting member, preventing thermal quenching while maintaining relative simplicity of the overall system
Solution Approach 2:
The patent changes the intensity distribution parameter of the light beam by inserting a beam shaping optical element in the optical path. This element modifies the spatial parameter of the light intensity without fundamentally changing the light source structure, achieving uniform heat distribution while preserving the simplicity of the light source design
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 achieves improved light conversion efficiency and brightness by ensuring uniform heating of the light converting member, resulting in higher luminance and reduced thermal quenching, with the beam shaping optical element using waveguides or diffractive elements to maintain a flat intensity distribution.
Implementation Method 1
The beam shaping optical element may comprise a waveguide having a non-circular cross section
Implementation Method 2
The beam shaping optical element may comprise a diffractive optical element
Implementation Method 3
The wavelength conversion may be due to luminescence, fluorescence, and/or phosphorescence
Implementation Method 4
The wavelength conversion may be due to luminescence, fluorescence, and/or phosphorescence
Implementation Method 5
The wavelength conversion may be due to luminescence, fluorescence, and/or phosphorescence
Data Source
AI summary
The present invention relates to a light emitting apparatus. The apparatus comprises a high intensity light source configured to emit light of a first wavelength; a beam shaping optical element configured to redistribute the light of the first wavelength emitted by the high intensity light source into an outgoing light beam having a far field beam cross sectional profile having a spatially flat light distribution; and a light converting member configured to be exposed to the outgoing light beam having the spatially flat light distribution, to convert at least a portion of the light of the first wavelength into light of a second wavelength, and to emit the light of the second wavelength.