Micro-LED Structure With Sloped Insulation for Light Extraction
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Solution Overview
Problem
Existing display technologies, such as LCDs and OLEDs, face challenges in achieving high-resolution displays with efficient light emission and reduced defect density.
Innovation Solution
The development of a light-emitting diode (LED) device with a specific structure, including a light emission layer with a first semiconductor layer having a larger second surface area, an active layer, a second semiconductor layer, an insulating layer defining an open region, and electrodes, where the angle between the insulating layer surfaces is less than 90°, enhancing light emission efficiency and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional LED structure with equal surface areas is used, then the manufacturing process is simpler, but the light emission efficiency is lower and defect density is higher
Solution Approach 1:
The patent applies asymmetry by designing the first semiconductor layer with a trapezoidal cross-section where the second surface area is larger than the first surface area. This asymmetric geometry increases the light emission surface area while maintaining structural integrity, thereby improving light extraction efficiency and reducing defect density without requiring complete structural redesign of the entire LED device.
Solution Approach 2:
The patent implements local quality by creating a region-specific variation in the first semiconductor layer's surface area. The larger second surface area is strategically positioned to enhance light emission in the critical emission region, while the overall layer structure remains consistent with standard LED architectures. This localized modification improves performance without increasing overall device complexity.
2Reliability
If the insulating layer angle is 90° or greater, then the electrode contact area is larger, but the light emission efficiency is reduced and defects increase
Solution Approach 1:
The insulating layer is designed with an asymmetric angle less than 90° relative to the substrate normal, creating a sloped configuration that optimizes the interface between the insulating layer and semiconductor layers. This angular asymmetry improves light extraction by reducing total internal reflection at the interface while maintaining adequate electrode contact through the sloped geometry.
Solution Approach 2:
The patent changes the geometric parameter of the insulating layer angle from the conventional 90° or greater to a specific range less than 90°. This parameter modification optimizes the balance between light emission efficiency and electrode contact, demonstrating how adjusting a single geometric parameter can resolve the contradiction between performance and structural requirements.
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 LED device achieves improved light emission efficiency and reduced defect density, leading to higher reliability and performance in display applications, such as micro-LED displays.
Implementation Method 1
a light emission layer including a first semiconductor layer including a first surface and a second surface facing the first surface
Data Source
AI summary
An LED device includes a light emission layer including a first semiconductor layer including a first surface and a second surface facing the first surface, the second surface having an area larger than an area of the first surface, an active layer on the first surface, and a second semiconductor layer on the active layer, an insulating layer on the first surface, the insulating layer defining an open region of the first semiconductor layer, a first electrode that contacts the first semiconductor layer via the open region, and a second electrode on the second semiconductor layer and contacting the second semiconductor layer.