Micro-LED Electrode Layout for Stable Contacts and Light Output
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Solution Overview
Problem
Existing technologies face challenges in efficiently manufacturing micro or nano-scale bar type LEDs for display devices, particularly in minimizing defects and improving light emission efficiency while ensuring stable connections and protection of electrodes.
Innovation Solution
A light emitting device is designed with a substrate and insulating layers, featuring banks and electrodes, conductive patterns, and contact electrodes, along with a specific fabrication method that includes self-alignment of light emitting elements and insulating material patterning to enhance connectivity and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro or nano-scale bar type LEDs are fabricated using inorganic crystal structures, then the device size is reduced to pixel level, but manufacturing precision and defect minimization become challenging
Solution Approach 1:
The manufacturing process is divided into multiple sequential steps including forming insulating material layers, creating conductive patterns, depositing electrodes, and forming contact electrodes. Each step is carefully controlled to maintain precision at micro/nano scale, with insulating layers providing isolation and structural support throughout the fabrication process.
Solution Approach 2:
Insulating material layers are formed beforehand to define the structural framework before depositing conductive patterns and electrodes. This preliminary structuring ensures precise positioning and prevents defects during subsequent manufacturing steps by establishing clear boundaries and isolation zones.
2Reliability
If multiple electrodes and contact electrodes are added to ensure stable connections, then connection reliability improves, but device complexity increases
Solution Approach 1:
Multiple functional layers are combined into a unified structure where insulating material layers serve both electrical isolation and mechanical support functions. Conductive patterns are integrated directly with electrode structures, and contact electrodes are formed as continuous structures connecting multiple components, reducing overall device complexity while maintaining connection reliability.
Solution Approach 2:
The insulating material layers perform multiple functions including electrical isolation, mechanical support, and structural definition. The conductive patterns serve both as electrical connections and as alignment guides for subsequent fabrication steps, reducing the need for separate dedicated components.
3Reliability
If conductive patterns and insulating layers are added to protect electrodes, then electrode protection improves, but manufacturing steps increase
Solution Approach 1:
Protective functions are merged with structural layers. The insulating material layers simultaneously provide electrode protection, electrical isolation, and mechanical support, eliminating the need for separate protective coating steps. Conductive patterns are integrated with electrode structures rather than being added as separate protective layers.
Solution Approach 2:
Each layer and structure is designed to perform multiple functions. Insulating layers provide protection, isolation, and support; conductive patterns provide both connection and alignment functions. This multi-functionality reduces the total number of manufacturing steps while ensuring comprehensive electrode protection.
Data Source
AI summary
A light emitting device may include: a substrate including a plurality of unit light emitting regions; and first to fourth insulating layers sequentially on the substrate. Each of the unit light emitting regions may include: at least one light emitting element on the first insulating layer, the at least one light emitting element having a first end portion and a second end portion in a length direction thereof; first and second partition walls on the substrate, and the first and second partition walls being spaced apart from each other; a first reflective electrode on the first partition wall and a second reflective electrode on the second partition wall; a first contact electrode on the first reflective electrode, the first contact electrode connecting the first reflective electrode and the first end portion of the light emitting element; a second contact electrode on the second reflective electrode, the second contact electrode connecting the second reflective electrode and the second end portion of the light emitting element; and a conductive pattern provided between the first insulating layer and the first contact electrode, the conductive pattern surrounding the first and second reflective electrodes when viewed on a plane.