Micro LED Tapered Optics for Reduced Internal Light Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current micro LED elements face challenges in enhancing light extraction efficiency, which is crucial for improving the performance of display devices and electronic apparatuses.
Innovation Solution
A light-emitting device design featuring a stacked body with a tapered shape, low refractive index portions, and a metal portion, where the light-emitting layer is positioned between semiconductor layers, and light is emitted from a second electrode with a lens surface, optimizing light reflection and refraction to enhance extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional micro LED structure is used, then device simplicity is maintained, but light extraction efficiency is insufficient
Solution Approach 1:
The device is segmented into multiple functional regions: tapered portion for light redirection, first low refractive index portion for lateral light extraction, and second low refractive index portion with lens surface for forward light extraction. This segmentation allows each region to address specific light extraction challenges, resolving the contradiction between structural simplicity and extraction efficiency.
Solution Approach 2:
The invention adds dimensional complexity by introducing a tapered geometry and lens surface curvature, transforming the conventional planar structure into a three-dimensional configuration. This dimensional change enables multiple light extraction pathways (lateral and forward directions) simultaneously, improving overall extraction efficiency without significantly complicating the manufacturing process.
2Loss of energy
If light extraction efficiency is improved through multiple structures, then light loss is reduced, but device complexity increases
Solution Approach 1:
Multiple light extraction functions are merged into a single integrated structure. The tapered portion, first low refractive index portion, and second low refractive index portion with lens surface work together as a unified light management system, reducing light loss through multiple reflections while avoiding the need for separate extraction components that would increase device complexity.
Solution Approach 2:
The lens surface with positive curvature is integrated into the second low refractive index portion, providing optical focusing and extraction functions. This curvature element improves light extraction efficiency by redirecting light paths and reducing internal reflections, while being formed as a single integrated feature rather than requiring multiple separate optical components.
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 design significantly improves light extraction efficiency by reducing light loss through multiple reflections and enhancing condensation of light, leading to improved performance in display devices and electronic apparatuses.
Implementation Method 1
a surface of the second low refractive index portion on a side opposite to the second electrode is a lens surface
Implementation Method 2
first low refractive index portion that is provided on a side surface of the tapered portion and has a lower refractive index than the stacked body, a second low refractive index portion that is provided on a side of the second electrode opposite to the stacked body and has a lower refractive index than the stacked body
Data Source
AI summary
A light-emitting device includes a stacked body that includes a tapered portion having a tapered shape having a width increasing from side of a first electrode toward side of a second electrode, a first low refractive index portion that is provided on a side surface of the tapered portion, a second low refractive index portion that is provided on side of the second electrode opposite to the stacked body, and a metal portion provided on a side surface of the second low refractive index portion, wherein the stacked body includes a first semiconductor layer, a second semiconductor layer, and a light-emitting layer, light generated in the light-emitting layer is emitted from the side of the second electrode, and a surface of the second low refractive index portion on side opposite to the second electrode is a lens surface.