Micro-LED Contact Electrode Passivation for Defect Isolation
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Solution Overview
Problem
Current light emitting diode (LED) technologies face challenges in minimizing contact defects, particularly in subminiature light emitting diodes, which affect their durability and efficiency, especially when used in micro-scale or nano-scale applications for display devices.
Innovation Solution
A light emitting device design featuring a substrate with emission areas, electrodes, light emitting elements, insulating layers, and contact electrodes, where the passivation pattern includes an inorganic insulating layer to minimize contact defects and enhance electrical connectivity, and a method of fabrication that involves forming insulating layers and contact electrodes to expose the ends of the light emitting elements for improved electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If subminiature light emitting diodes are used in micro-scale or nano-scale applications, then the device size is reduced for display applications, but contact defects increase affecting durability and efficiency
Solution Approach 1:
The device is segmented into distinct functional layers including substrate, electrode layer, light emitting element layer, insulating layer, and contact electrode layer. This segmentation allows each layer to be optimized independently, with the insulating layer specifically designed to prevent contact defects between adjacent contact electrodes while maintaining electrical connectivity where needed
Solution Approach 2:
An insulating layer is introduced as an intermediary between the contact electrodes and light emitting elements. This intermediate layer prevents direct contact between adjacent contact electrodes, eliminating contact defects while still allowing electrical connection through designated contact holes, thus improving reliability in miniaturized devices
2Area of stationary object
If contact electrodes are placed close together to reduce device area, then the area is reduced for micro-scale applications, but contact defects increase due to electrical interference
Solution Approach 1:
The insulating layer is applied selectively in specific locations between contact electrodes rather than uniformly across the entire device. Contact holes are created only where electrical connection is needed, while insulating material is deposited in regions where electrical isolation is required. This local differentiation allows close spacing of contact electrodes without causing contact defects
Data Source
AI summary
A light emitting device may include: a substrate including emission areas; a first electrode disposed on the substrate, and a second electrode spaced apart from the first electrode; at least one light emitting element disposed on the substrate, and including a first end and a second end; an insulating layer disposed on the light emitting element and allowing the first and second ends of the light emitting element to be exposed; a first contact electrode electrically connecting the first electrode with the first end of the light emitting element; a second contact electrode electrically connecting the second electrode with the second end of the light emitting element; and a passivation pattern disposed on each of the first and second contact electrodes. The first and second contact electrodes may be disposed on the insulating layer and spaced apart from each other and may be electrically separated from each other.