Micro-LED Electrode Connection Using Tapered Insulating Patterns
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Solution Overview
Problem
Existing light emitting devices face challenges in reliably connecting subminiature light emitting diodes between electrodes while simplifying the fabrication process, especially for nanoscale to microscale sized diodes, which affects their electrical stability and efficiency.
Innovation Solution
A light emitting device design featuring a substrate with first and second electrodes spaced apart, with a light emitting diode disposed between them, an insulating pattern overlapping the diode ends, and contact electrodes connecting the diode ends to the electrodes, where the insulating pattern's width reduces towards its lower portion, ensuring reliable electrical connection and simplified fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connection methods are used for subminiature light emitting diodes, then the fabrication process becomes complex with multiple mask processes, but the electrical connection reliability is improved
Solution Approach 1:
The insulating pattern is extracted and positioned to overlap the upper portion of the light emitting diode, exposing the first and second ends. This extraction of the insulating layer at specific locations enables direct electrical connection without requiring complex mask processes, thereby simplifying the fabrication process while maintaining connection reliability
Solution Approach 2:
Contact electrodes are introduced as intermediary elements between the light emitting diode ends and the first/second electrodes. These contact electrodes facilitate reliable electrical connection while the insulating pattern manages the spatial arrangement, allowing for simplified fabrication processes
2Object-affected harmful factors
If the insulating pattern completely covers the light emitting diode, then insulation is improved, but electrical connection to the diode ends becomes difficult
Solution Approach 1:
The insulating pattern exhibits local quality by completely overlapping the upper portion of the light emitting diode for insulation, while selectively exposing the first and second ends through controlled removal or positioning. This local differentiation maintains insulation performance where needed while enabling electrical connections at specific locations
Solution Approach 2:
The insulating pattern is segmented in its coverage over the light emitting diode, with different regions serving different functions: the upper portion provides complete insulation, while the areas around the first and second ends are exposed to allow electrical connection. This segmentation resolves the contradiction between insulation and connectability
Data Source
AI summary
A light emitting device includes first and second electrodes disposed on a substrate and spaced apart from each other; at least one light emitting diode disposed between the first and second electrodes; an insulating pattern overlapping an upper portion of the at least one light emitting diode and exposing first and second ends of the at least one light emitting diode; a first contact electrode electrically connecting the first end of the at least one light emitting diode to the first electrode; and a second contact electrode electrically connecting the second end of the at least one light emitting diode to the second electrode. The insulating pattern may completely overlap the first and second ends of the at least one light emitting diode in a plan view, and have a width reducing toward a lower portion of the insulating pattern.