LED Sub-Pixel Epitaxy With Confinement Walls for Uniform Dimensions
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Solution Overview
Problem
The challenge in manufacturing optoelectronic devices with light-emitting diodes is to achieve homogeneity in diode dimensions, prevent light crosstalk, and reduce parasitic material deposits, particularly as miniaturization increases, leading to issues with light confinement walls and wavelength variability.
Innovation Solution
A method involving the simultaneous formation of light-emitting diodes and light confinement walls using a substrate with distinct areas for each, where the confinement walls are formed concomitantly with the diodes, using the same materials and techniques, and are designed to capture excess material, ensuring accurate positioning and reducing the number of manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light confinement walls are formed using additional steps after light-emitting diode formation, then light crosstalk between sub-pixels is blocked, but manufacturing complexity and alignment difficulty increase
Solution Approach 1:
The patent combines the formation of light-emitting diodes and light confinement walls into a single simultaneous epitaxial growth process. Both structures are formed from the same semiconductor material layers in the same reactor chamber, eliminating the need for separate processing steps and reducing alignment complexity while maintaining effective light confinement.
Solution Approach 2:
The semiconductor material layers serve dual functions: they form both the light-emitting diode structures and the light confinement walls. The same epitaxial growth process produces both functional elements, making the manufacturing process more efficient and reducing the number of specialized steps required.
2Manufacturing precision
If light-emitting diodes are miniaturized to increase resolution, then display density improves, but alignment precision between confinement walls and diodes becomes more difficult to maintain
Solution Approach 1:
By forming light-emitting diodes and confinement walls simultaneously in the same epitaxial growth process, the patent eliminates alignment issues between separately fabricated components. Both structures grow from the same material layers and are defined by the same masking patterns, ensuring precise relative positioning even at miniaturized dimensions.
3Ease of manufacture
If peripheral light-emitting diodes are formed without special considerations, then manufacturing is simplified, but dimensional homogeneity deteriorates due to excess material supply
Solution Approach 1:
The patent applies different formation conditions to different spatial locations on the substrate. Peripheral light-emitting diodes and central light-emitting diodes are formed with different material supply rates or growth parameters, compensating for the edge effect and achieving uniform dimensions across the entire substrate while maintaining a single manufacturing process.
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 results in homogeneous diode dimensions, reduced parasitic deposits, and improved light confinement, achieving consistent wavelength emission across sub-pixels without additional steps, enhancing the resolution and performance of display screens and image projection systems.
Implementation Method 1
all or part of light confinement wall elements, concomitantly with all or part of the light-emitting diodes which are formed in step d)
Implementation Method 2
the light confinement wall elements having an ability to capture all or part of the material used in step d) for the formation of the first, second and third portions of light-emitting diode
Data Source
AI summary
A method for manufacturing an optoelectronic device including the steps of forming a substrate having a support face; forming a first series of first areas adapted to the formation of all or part of light-emitting diodes, forming a second series of second areas on the support face, adapted to the formation of light confinement wall elements capable of forming a light confinement wall, the second areas defining therebetween sub-pixel areas; forming, from the first areas, light-emitting diodes; forming, by the same technique as in the previous step, from the second areas, light confinement wall elements, concomitantly with all or part of the light-emitting diodes which are formed in the previous step.