Micro-LED Reflective Electrode Structure for Defect Control
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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.
Innovation Solution
A light emitting device is designed with a substrate and insulating layers, including unit light emitting regions with specific electrode configurations and conductive patterns, and a method of fabrication involving 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 constitute display pixels, but manufacturing defects increase and light emission efficiency decreases
Solution Approach 1:
The patent introduces an organic compound layer as an intermediary between the inorganic crystal LED and the electrode, facilitating better interface compatibility and reducing manufacturing defects at the heterostructure interface
Solution Approach 2:
The patent modifies the structural parameters of the LED by integrating organic compounds with specific molecular structures and properties, changing the material composition parameters to improve both manufacturability and light emission efficiency at micro/nano scales
2Volume of moving object
If micro or nano-scale bar type LEDs are fabricated using inorganic crystal structures, then the device size is reduced to constitute display pixels, but light emission efficiency decreases
Solution Approach 1:
The patent creates a composite structure combining inorganic crystal LED materials with organic compound materials, leveraging the advantages of both material types to maintain high light emission efficiency at micro/nano scales
Solution Approach 2:
The patent optimizes the molecular structure parameters and composition ratios of the organic compounds to maximize light emission efficiency while maintaining the reduced device size
3Reliability
If complex electrode configurations and conductive patterns are used in unit light emitting regions, then connectivity and protection are enhanced, but device complexity increases
Solution Approach 1:
The patent divides the electrode structure into multiple functional segments (first electrode, second electrode, conductive pattern) with distinct roles, allowing each segment to be optimized independently while maintaining overall reliability
Solution Approach 2:
The patent employs multi-layer stacking of electrodes and insulating layers in the vertical dimension, achieving enhanced connectivity and protection through three-dimensional spatial arrangement rather than planar complexity
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.