Micro-Nanofin LED Electrode Assembly for Self-Aligned Light Efficiency
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Solution Overview
Problem
Existing micro-LED electrode assemblies face challenges in manufacturing high-resolution displays due to limitations in process technology, resulting in high unit prices, high defect rates, and low productivity, especially when attempting to individually arrange micro-LEDs or nano-LEDs on miniaturized electrodes, which leads to inefficiencies in light emission and increased surface defects.
Innovation Solution
A micro-nanofin LED electrode assembly is developed, where micro-nanofin LED elements with a rod-type structure and a stacked configuration of conductive semiconductor layers, a photoactive layer, and an electrode layer are self-aligned using an electric field, increasing the emission area and reducing surface defects, thereby enhancing luminance and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nanorod-type LED elements are used with self-alignment by electric field, then ease of manufacture is improved, but luminous efficiency deteriorates due to narrow emission area
Solution Approach 1:
The invention transitions from one-dimensional nanorod structures (emitting light from top and bottom surfaces only) to two-dimensional micro-nanofin structures (emitting light from top, bottom, and side surfaces). This dimensional expansion increases the emission area from just the top/bottom surfaces to include lateral surfaces, thereby improving luminous efficiency while maintaining the self-alignment manufacturing advantage
Solution Approach 2:
The micro-nanofin structure can be viewed as a nested configuration where the photoactive layer is positioned within conductive semiconductor layers, creating a multi-layered structure that maximizes light emission from multiple surfaces while maintaining structural integrity for efficient manufacturing
2Device complexity
If nanorod-type LED elements are used, then device complexity is reduced, but reliability deteriorates due to surface defects affecting efficiency
Solution Approach 1:
The invention employs a composite structure consisting of multiple functional layers (first conductive semiconductor layer, photoactive layer, second conductive semiconductor layer) where each layer contributes specific properties. This composite approach allows optimization of each layer to minimize surface defects and improve reliability while maintaining manufacturing simplicity
3Manufacturing precision
If micro-LEDs are individually placed using pick and place technology, then manufacturing precision can be achieved, but productivity deteriorates
Solution Approach 1:
The micro-nanofin LED elements possess self-aligning properties when exposed to electric fields, allowing them to automatically position themselves on the substrate without requiring complex pick-and-place machinery. This self-service capability achieves precise placement while dramatically improving production efficiency and reducing manufacturing 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 micro-nanofin LED electrode assembly achieves improved luminance and light efficiency by expanding the emission area, minimizing surface defects, and optimizing electron-hole recombination, facilitating easier self-alignment and broader application in lighting and display technologies.
Implementation Method 1
applying an assembly voltage to the lower electrode line so that a first conductive semiconductor layer, or an electrode layer or a polarization inducing layer of each of the plurality of micro-nanofin LED elements in the solution is in contact with at least two of the lower electrodes, thereby self-aligning the plurality of micro-nanofin LED elements
Data Source
AI summary
The present invention relates to an LED electrode assembly, more particularly, to a micro-nanofin LED electrode assembly, a method for manufacturing the same, and a light source including the same.