Curved-Top Micro LED Structure for Better Light Extraction
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Solution Overview
Problem
Current micro LED technology faces challenges in improving light emission efficiency.
Innovation Solution
The micro LED design features a curved top surface with a P-N structure, including a first type semiconductor layer, a light emitting layer, and a second type semiconductor layer, along with a top conductive layer, which enhances light extraction efficiency and beam angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat top surface is used in conventional micro LEDs, then the manufacturing process is simpler, but the light extraction efficiency is lower
Solution Approach 1:
The patent applies curvature by forming a convex curved surface on the top of the micro LED structure. This curved surface replaces the conventional flat top surface, enabling improved light extraction efficiency through enhanced light outcoupling while maintaining compatibility with standard manufacturing processes.
2Loss of energy
If a curved top surface is implemented to improve light extraction, then light emission efficiency increases, but the manufacturing complexity increases
Solution Approach 1:
The convex curved surface is formed using conventional semiconductor manufacturing techniques such as epitaxial growth or molding, avoiding the need for complex post-processing steps. The curvature is integrated into the device structure itself rather than being added as a separate component, thus improving light extraction without significantly increasing manufacturing complexity.
3Illumination intensity
If a curved top surface is used, then beam angle performance is improved, but the device structure becomes more complex
Solution Approach 1:
The curved top surface naturally acts as a lens that broadens the emission beam angle through geometric optics. This structural feature provides beam angle control without requiring additional optical components such as microlenses or diffusers, thereby improving illumination performance while minimizing structural complexity.
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 curved top surface micro LED design increases light extraction efficiency and improves beam angle performance, addressing the challenge of low light emission efficiency in existing micro LED technology.
Implementation Method 1
a top surface of the micro LED is a curved surface... enhances light extraction efficiency
Data Source
AI summary
A micro LED includes: a bonding layer; a P-N structure formed on the bonding layer, wherein the P-N structure includes a first type semiconductor layer, a light emitting layer formed on the first type semiconductor layer, and a second type semiconductor layer formed on the light emitting layer; and a top conductive layer formed on the P-N structure, wherein a top surface of the micro LED is a curved surface.