Light-emitting Component with Dual-refractive Cavity
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Solution Overview
Problem
Light-emitting components with black housings for displays and video-wall modules suffer from reduced yield and unnecessary heating due to absorption of light emitted at inclined angles, which is not effectively utilized or managed.
Innovation Solution
A light-emitting component design featuring a housing with a cavity filled with a transparent material composed of two materials with different refractive indices, where the first material covers the limiting wall and the second material covers the emission side, creating a boundary surface that reflects light at an angle greater than the critical angle for total reflection, allowing light to exit without absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a black housing is used to provide strong contrast for display images, then the contrast is improved, but light emitted at inclined angles is absorbed by the housing, reducing yield and causing unnecessary heating
Solution Approach 1:
The patent introduces a transparent material as an intermediary substance filling the cavity between the light-emitting element and the black housing. This transparent material has a refractive index different from the housing material, creating a boundary surface that redirects light paths. The intermediary allows light to exit the housing without being absorbed, while the black housing maintains its contrast-providing function for the display image.
Solution Approach 2:
The patent changes the optical parameters of the cavity by filling it with a transparent material having a specific refractive index that differs from the housing material. This parameter change (refractive index difference) creates total internal reflection at the boundary surface, altering the light propagation paths and preventing light absorption by the black housing, thereby reducing energy loss while maintaining contrast.
2Illumination intensity
If a black housing is used to provide strong contrast, then the contrast is improved, but the housing is heated unnecessarily due to light absorption
Solution Approach 1:
The transparent material acts as an optical intermediary that redirects light paths through refractive index differences. By creating a boundary surface between the transparent material and the black housing, it prevents light from striking and heating the housing material, thus reducing unnecessary temperature increase while the housing continues to provide contrast for the display.
3Device complexity
If the cavity is filled with a single transparent material, then the structure is simple, but light emitted at inclined angles cannot be effectively redirected to exit the housing
Solution Approach 1:
The patent employs a composite optical system consisting of two transparent materials with different refractive indices filling the cavity. This composite arrangement creates a boundary surface that exploits total internal reflection to redirect light paths. The combination of materials enables effective redirection of light emitted at inclined angles, increasing the proportion of light that can exit the housing and improve overall light yield.
Solution Approach 2:
By changing the optical parameters (refractive indices) of the materials filling the cavity, the patent creates conditions for total internal reflection at the boundary surface. The specific parameter difference between the two transparent materials enables effective light redirection for inclined angles, transforming the optical behavior within the cavity to improve light extraction efficiency.
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 design increases the yield of light-emitting components by reflecting and emitting light that would otherwise be absorbed, reducing heating and improving contrast by preventing light from striking the housing material.
Implementation Method 1
the curve of the boundary surface is formed such that a beam of light originating from the emission side and transmitted by the light-emitting element strikes the boundary surface at an angle, the angle being larger than a critical angle for a total reflection
Implementation Method 2
a first refractive index of the first material is smaller than a second refractive index of the second material
Data Source
AI summary
A light-emitting component includes a light-emitting element and a housing with a cavity. The housing includes a housing material that absorbs at least 80 percent of light in the visible range. The cavity is formed by a limiting wall, formed by a housing surface, and a plane of the element. The light-emitting element arranged within the cavity of the housing and positioned above the element plane includes an emission side located opposite to the element plane. The cavity is at least partially filled with a transparent material composed of a first material and a second material, wherein the first material at least partially covers the limiting wall, and the second material at least partially covers the emission side. A boundary surface is formed between the first material and the second material. A first refractive index of the first material is smaller than a second refractive index of the second material.