μ-LED Quantum Well Structure for High-Resolution Brightness
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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 like the fly screen effect and reduced radiative recombination efficiency, affecting the display's brightness and efficiency.
Innovation Solution
The use of slotted antenna structures and quantum well intermixing techniques to enhance radiative recombination, combined with innovative semiconductor layer designs and epitaxial growth methods, improves light emission efficiency and reduces non-radiative recombination, allowing for higher brightness and longer lifespan of μ-LEDs.
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 radiative recombination efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the quantum well structure parameters (width, composition, depth) to optimize radiative recombination efficiency at reduced μ-LED sizes. By adjusting these parameters, the patent maintains high light emission efficiency despite the smaller device dimensions required for high-resolution displays.
2Measurement precision
If μ-LED size is reduced for high-resolution displays, then display resolution is improved, but brightness deteriorates
Solution Approach 1:
The patent applies local quality by creating optimized quantum well regions with specific material compositions and structures within the μ-LED active area. This localized optimization ensures that the light emission properties are enhanced precisely where needed, maintaining high brightness in miniaturized devices for high-resolution displays.
3Loss of energy
If quantum well intermixing is used to enhance radiative recombination, then radiative recombination efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-designing the quantum well structure with controlled intermixing regions during the epitaxial growth process. This preliminary structuring of the quantum wells with appropriate composition gradients and interface designs enables enhanced radiative recombination while maintaining a manufacturable process flow through standardized growth parameters.
4Illumination intensity
If innovative semiconductor layer designs are used to improve light emission, then brightness is improved, but production complexity increases
Solution Approach 1:
The patent applies merging by combining multiple semiconductor layers with different material compositions and optical properties into an integrated quantum well structure. This consolidation of multiple functional layers into a single epitaxial growth process achieves enhanced brightness while avoiding the complexity of assembling separate components, thereby maintaining production 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
These solutions enhance the radiative recombination efficiency, reduce non-radiative recombination, and improve the brightness and lifespan of μ-LEDs, addressing the challenges of small size and production complexity, resulting in better performance for augmented reality and automotive applications.
Implementation Method 1
reduced non-radiative recombination and improved the brightness
Implementation Method 2
epitaxial growth methods
Implementation Method 3
quantum well intermixing techniques to enhance radiative recombination
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.