Self-Aligned Light Confinement Walls for High-Resolution LED Arrays
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Solution Overview
Problem
Existing methods for manufacturing optoelectronic devices with arrays of light-emitting diodes face challenges in achieving high resolution and contrast due to difficulties in accurately aligning light confinement walls with the diodes, especially as miniaturization increases, leading to complex and costly techniques.
Innovation Solution
A method involving the formation of elongate wire-like light-emitting diodes on a substrate, surrounded by transparent dielectric spacing walls and reflective light confinement walls that directly cover the spacing walls, allowing precise alignment and efficient light blocking between diodes, with the light confinement walls deposited as thin layers to cover lateral and upper borders of the diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional alignment methods are used for light confinement walls, then manufacturing complexity increases, but alignment precision deteriorates due to the complexity of the processes
Solution Approach 1:
The light confinement walls self-align to the light-emitting diodes through the epitaxial growth process, where the walls form directly on the semiconductor substrate in the desired positions without requiring separate alignment steps. The growth process inherently provides the alignment function, eliminating the need for complex external alignment mechanisms.
Solution Approach 2:
The patent replaces mechanical alignment methods with epitaxial growth, a chemical vapor deposition process that forms the light confinement walls directly on the substrate. This substitution of mechanical alignment with a chemical growth process eliminates the complexity of mechanical positioning and alignment systems while achieving precise alignment.
2Reliability
If light confinement walls are formed to block light radiation, then light blocking efficiency improves, but manufacturing cost increases due to complex techniques
Solution Approach 1:
The light confinement walls form themselves through the epitaxial growth process during the normal manufacturing sequence, without requiring additional specialized processing steps. The walls emerge as a natural byproduct of the growth process, making light blocking efficient while keeping manufacturing simple and cost-effective.
Solution Approach 2:
The formation of light confinement walls is merged with the existing epitaxial growth process for the light-emitting diodes. By combining these two functions into a single process step, the patent achieves both light blocking efficiency and manufacturing simplicity, eliminating the need for separate light confinement wall fabrication steps.
3Manufacturing precision
If miniaturization of light-emitting diodes is increased, then device resolution improves, but alignment accuracy deteriorates due to the small scale
Solution Approach 1:
The patent replaces mechanical alignment methods with epitaxial growth, which operates at the atomic level and can achieve precise positioning even at micrometer and sub-micrometer scales. This chemical growth approach maintains alignment accuracy despite the miniaturization of the light-emitting diodes, enabling high device resolution without sacrificing alignment precision.
Solution Approach 2:
The patent changes the alignment mechanism from macroscopic mechanical positioning to atomic-level epitaxial growth parameters. By controlling growth conditions such as temperature, pressure, and precursor flow rates, the system achieves precise alignment at the miniaturized scale where traditional mechanical measurement and positioning methods become inadequate.
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 approach enables the production of high-resolution and high-contrast optoelectronic devices in a simple, economical, and non-restrictive manner, ensuring accurate alignment and efficient light confinement, thereby enhancing the device's performance.
Implementation Method 1
light confinement walls made of a second material adapted to block the light radiation originating from the light-emitting diodes
Implementation Method 2
light confinement walls made of a second material adapted to block the light radiation originating from the light-emitting diodes
Implementation Method 3
spacing walls made of a first dielectric material transparent to the light radiation originating from the light-emitting diodes
Implementation Method 4
each light-emitting diode comprises an active material exploiting quantum wells
Data Source
AI summary
The manufacture of an optoelectronic device includes the formation of light-emitting diodes where each one has a wire form, the formation of spacing walls made of a first dielectric material transparent to the light radiation originating from the diodes. The lateral sidewalls of each diode are surrounded by spacing walls. Light confinement walls are made of a second material adapted to block the light radiation originating from the diodes. The light confinement walls directly cover the lateral sidewalls of the spacing walls by being in contact with the wherein. A thin layer of the second material is deposited so as to directly cover the lateral sidewalls of the spacing walls by being in contact with the wherein and cover the upper border of the light-emitting diodes. The empty spaces delimited between the spacing walls at the level of the areas between the light-emitting diodes are also filled by the thin layer.