Micro-LED Electrode Layout for Stable Self-Alignment
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Solution Overview
Problem
Current light emitting diode (LED) technologies face challenges in minimizing defects and improving light efficiency in display devices, particularly in the fabrication of micro or nano-scale bar type LEDs for self-luminescent display applications.
Innovation Solution
A light emitting device is designed with a substrate having unit light emitting regions, including insulating layers, electrodes, and a conductive pattern, where the light emitting elements are self-aligned using an electric field, and protected by capping layers to enhance durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro or nano-scale bar type LEDs are fabricated for self-luminescent display applications, then the display device achieves higher resolution and smaller pixel size, but the manufacturing precision and alignment stability become more difficult to maintain
Solution Approach 1:
A conductive pattern is introduced as an intermediary component between the first and second electrodes. This conductive pattern serves as a mediator that establishes a stable electric field distribution, enabling precise self-alignment of the light emitting element at micro or nano-scale without compromising manufacturing precision
Solution Approach 2:
The patent replaces mechanical alignment methods with an electric field-based self-alignment mechanism. By applying voltage to the first and second electrodes, an electric field is generated that automatically positions the light emitting element with high precision, eliminating the need for complex mechanical alignment structures at micro-scale
2Illumination intensity
If light emitting elements are positioned at micro or nano-scale, then the display device achieves higher luminance efficiency, but the reliability and durability of the device decrease
Solution Approach 1:
Capping layers are formed beforehand to cover and protect the first and second electrodes. This protective structure is established in advance to prevent potential damage to the micro-scale light emitting elements, thereby enhancing device reliability and durability while maintaining high luminance efficiency
Solution Approach 2:
The device employs a composite structure combining multiple materials with different properties: the conductive pattern provides electrical functionality, the insulating layers provide electrical isolation, and the capping layers provide mechanical protection. This multi-material composite approach ensures both high luminance efficiency and enhanced reliability at micro-scale
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution minimizes defects and improves light efficiency by ensuring stable alignment and protection of light emitting elements, leading to enhanced performance and lifespan in display devices.
Implementation Method 1
a conductive pattern provided between the first insulating layer and the first contact electrode, the conductive pattern surrounding the first and second electrodes when viewed on a plane
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.