Vertical Micro LED Electrode Structure for Low-Resistance Contacts
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Solution Overview
Problem
In the manufacturing of ultra-small light emitting display devices, micro light emitting elements are contacted without a separate electrode between the common electrode and the light emitting element, leading to resistance problems.
Innovation Solution
A vertical light emitting element is designed with a first contact electrode in contact with a pixel electrode and a second contact electrode in contact with a common electrode, where the pixel electrode and common electrode are located vertically with the light emitting element interposed between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If micro light emitting elements are contacted without a separate electrode between the common electrode and the light emitting element, then device complexity is reduced, but contact resistance increases
Solution Approach 1:
The patent transitions from a planar contact structure to a vertical three-dimensional contact structure. The connection electrode extends downward from the common electrode plane to directly contact the light emitting element, creating a vertical conduction path that reduces contact resistance while maintaining structural simplicity.
Solution Approach 2:
The patent introduces a connection electrode as an intermediary component between the common electrode and the light emitting element. This connection electrode serves as a mediator that provides a low-resistance electrical path, solving the contact resistance problem without requiring complex electrode structures.
2Reliability
If a vertical light emitting element structure with separate contact electrodes is used, then contact resistance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the contact structure into separate functional components: a common electrode, a connection electrode, and a light emitting element with its own contact electrodes. This segmentation allows each component to be optimized independently and facilitates modular manufacturing, reducing the overall precision requirements compared to a fully integrated structure.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the light emitting element. The first and second portions have different diameters, with the first portion having a smaller diameter for direct contact with the pixel electrode and the second portion having a larger diameter for connection to the common electrode through the connection electrode. This local differentiation optimizes both electrical contact and manufacturing feasibility.
Data Source
AI summary
A light emitting element, a display device, a method of manufacturing a light emitting element, and a method of manufacturing a display device are provided. The light emitting element includes a first portion including a first contact electrode, a first semiconductor layer, an active layer, and a second semiconductor layer arranged in a sequence, a second portion including a second contact electrode, a second semiconductor layer, and a third semiconductor layer arranged in a sequence, and a protective layer on a top portion and a side of the first portion and on a top portion and a side of the second portion, the first portion is on the second portion, and a diameter of the first portion may be smaller than a diameter of the second portion.