μ-LED Quantum Well Structure for High-Resolution Light Extraction
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Solution Overview
Problem
The development of μ-LEDs for augmented reality and automotive applications faces challenges due to their small size, which complicates production and processing, leading to issues such as the fly screen effect, reduced packing density, and increased non-radiative recombination, affecting efficiency and luminosity.
Innovation Solution
The use of slotted antenna structures and quantum well intermixing techniques to enhance radiative recombination, combined with specific semiconductor layer designs and epitaxial growth methods, helps in improving the efficiency and luminosity of μ-LEDs by reducing non-radiative recombination and increasing the light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If μ-LED size is reduced for high-resolution displays, then display resolution is improved, but non-radiative recombination increases and luminosity decreases
Solution Approach 1:
The patent applies local quality by creating a quantum well structure with specific compositional gradients in the active region. The quantum well has a graded composition profile that varies locally to optimize carrier confinement and radiative recombination specifically in the active region, while other parts of the device maintain their respective functions. This localized structural optimization addresses the non-radiative recombination issue without compromising the overall device miniaturization.
Solution Approach 2:
The patent employs parameter changes by modifying the compositional parameters of the semiconductor layers, particularly the aluminum indium gallium phosphide composition ratios. By adjusting the indium and aluminum content gradients within the quantum well, the patent optimizes the balance between radiative and non-radiative recombination rates, enabling high luminosity despite the reduced μ-LED size required for high-resolution displays.
2Measurement precision
If μ-LED size is reduced for high-resolution displays, then display resolution is improved, but light extraction efficiency decreases
Solution Approach 1:
The patent implements local quality through surface texturing and optical cavity structures at the light extraction interface. These localized optical features are designed to enhance light extraction specifically from the active region, compensating for the reduced overall device size. The optical cavity and surface structures create favorable local optical conditions that improve light extraction efficiency without requiring larger device dimensions.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the refractive index parameters through compositional grading in the semiconductor layers. The graded composition profile creates refractive index variations that enhance light extraction through reduced total internal reflection, allowing efficient light extraction from miniaturized μ-LED structures suitable for high-resolution displays.
3Measurement precision
If μ-LED size is reduced for high-resolution displays, then display resolution is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies merging by integrating multiple functions into the quantum well active region structure. The graded composition quantum well simultaneously provides carrier confinement, radiative recombination enhancement, and optical mode control functions. This functional integration reduces the need for separate structural components, thereby simplifying the manufacturing process despite the advanced material requirements for high-resolution μ-LED displays.
Solution Approach 2:
The patent employs parameter changes through precise control of compositional gradients during epitaxial growth. By optimizing the grading parameters of the aluminum indium gallium phosphide layers, the patent achieves multiple performance objectives simultaneously, reducing the need for additional processing steps and simplifying manufacturing while maintaining the advanced functionality required for high-resolution displays.
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
These approaches result in improved luminous efficiency, reduced non-radiative recombination, and enhanced light extraction, addressing the challenges of small size and increasing the reliability and performance of μ-LEDs for high-resolution displays.
Implementation Method 1
enhance radiative recombination, combined with specific semiconductor layer designs and epitaxial growth methods, helps in improving the efficiency and luminosity of μ-LEDs
Implementation Method 2
quantum well intermixing techniques to enhance radiative recombination
Implementation Method 3
semiconductor layers with different band gaps arranged in a stack
Data Source
AI summary
The invention relates to various aspects of a μ-LED or a μ-LED array for augmented reality or lighting applications, in particular in the automotive field. The μ-LED is characterized by particularly small dimensions in the range of a few μm.