Miniaturized LED Light Channel Extraction Design
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Solution Overview
Problem
Miniaturized light-emitting diodes face challenges in light extraction efficiency due to light being trapped within the device, with a 40% reduction compared to bare chips, and difficulties in filling spaces between sidewalls leading to voids and further reduced efficiency.
Innovation Solution
A light-emitting device design featuring a light channel with a reflecting layer, conducting layers, and a wavelength converting material, where the light channel is filled with a filling material, and the light output surface is designed to intersect at different angles to enhance light extraction, including the use of micro lenses for improved light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light-emitting diode is miniaturized, then the device size is reduced, but the light extraction efficiency drops by 40% compared to bare chips
Solution Approach 1:
The patent introduces a light channel with a light output surface that extends in a direction substantially perpendicular to the light emission direction of the light-emitting unit. This dimensional extension provides an additional extraction path for trapped light, allowing light to escape through the light output surface rather than being confined to the traditional top/bottom extraction paths, thereby improving light extraction efficiency in miniaturized devices
Solution Approach 2:
The patent introduces a light channel as an intermediary structure between the light-emitting unit and the external environment. This light channel acts as a mediator that guides and extracts light that would otherwise be trapped within the miniaturized device, improving light extraction efficiency without increasing the overall device footprint
2Volume of moving object
If the spacing between sidewalls is decreased for miniaturization, then the device size is reduced, but filling material cannot be properly filled and voids are generated
Solution Approach 1:
The light channel extends in a direction substantially perpendicular to the light emission direction, providing an additional dimensional space for filling material. This vertical extension allows filling material to be properly deposited without generating voids, even when the horizontal spacing between sidewalls is decreased for miniaturization
3Volume of moving object
If the spacing between sidewalls is decreased for miniaturization, then the device size is reduced, but light is trapped inside voids and extraction efficiency is reduced
Solution Approach 1:
The light channel extends vertically perpendicular to the light emission direction, providing an additional extraction dimension. This allows light that would be trapped in voids to be guided out through the light output surface, improving extraction efficiency while maintaining miniaturized horizontal dimensions
Solution Approach 2:
The light channel acts as an intermediary structure that captures and guides light from the light-emitting unit. This mediator structure ensures that light is properly extracted even when voids are present in the filling material, preventing light trapping and maintaining extraction efficiency in miniaturized devices
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 design significantly improves light extraction efficiency by directing trapped light out of the device and achieving uniform light distribution, suitable for applications like liquid crystal displays.
Implementation Method 1
a first reflecting layer covering the inner surface
Implementation Method 2
a wavelength converting material for receiving light from the light-emitting unit and generating excited light
Implementation Method 3
the light-emitting unit is on the inner surface and emits light to propagate inside the light channel towards the light output surface
Data Source
AI summary
This application relates to a light-emitting device comprising a light channel having an upper surface, a lower surface opposite to the upper surface, an inner surface intersecting with each of the upper and lower surface by different angles, and an escape surface; and a light-emitting element having a bottom surface substantially parallel to the inner surface and emitting light traveling inside the light channel toward the escape surface. In an embodiment, the escape surface of the light-emitting device is an inclined plane with lens array thereon.