Polygonal Electrode Layout for Self-Aligned Micro-LED Displays
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Solution Overview
Problem
Existing display devices face challenges in improving the behavior and alignment of light emitting elements between electrodes, particularly in achieving efficient self-alignment and enhanced performance in micro-scale light emitting devices.
Innovation Solution
The design incorporates a substrate with specific electrode structures, including closed polygonal shapes and bridge patterns, to improve the alignment and behavior of light emitting elements, which are arranged in a pentile structure with n-type and p-type semiconductor layers, and utilize insulation films to prevent short circuits and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are supplied through inkjet printing or slit coating methods, then the elements can be dispersed in solution and supplied to the light emission area, but the alignment and behavior of the elements between electrodes cannot be sufficiently improved
Solution Approach 1:
The first electrode is divided into multiple sections (first section, second section, third section, fourth section) with different functions. The second electrode is similarly segmented into multiple sections. This segmentation allows each section to contribute differently to the electric field distribution, improving light emitting element alignment without requiring a completely complex new structure.
Solution Approach 2:
Different sections of the electrodes have different local properties - some sections are connected while others are spaced apart, creating localized variations in the electric field. This local quality variation guides the self-alignment of light emitting elements to specific positions between the electrodes, enhancing manufacturing precision.
2Manufacturing precision
If a voltage is supplied to first and second electrodes to form an electric field, then light emitting elements can self-align between the electrodes, but the behavior and alignment performance cannot be sufficiently enhanced
Solution Approach 1:
The electrode structure creates a dynamic electric field distribution that can be adjusted by controlling which sections are connected or spaced apart. This dynamic capability allows optimization of the self-alignment process while maintaining stable element behavior during operation.
Solution Approach 2:
The multi-section electrode structure acts as an intermediary mechanism that mediates between the applied voltage and the light emitting elements. By controlling the connection and spacing of different sections, the electric field is shaped to guide element alignment while maintaining operational stability.
3Manufacturing precision
If closed loop polygonal shapes are used in electrode sections, then alignment is improved, but the device structure becomes more complex
Solution Approach 1:
The electrodes incorporate closed loop polygonal shapes (such as hexagons or octagons) which provide asymmetric geometric features. These asymmetric shapes create specific electric field patterns that improve element positioning accuracy while the modular nature of the sections keeps the overall complexity manageable.
Solution Approach 2:
The closed loop polygonal shapes add geometric complexity in the planar dimension, but this is balanced by the modular sectioning approach that simplifies the vertical stacking and connection architecture. The dimensional distribution of complexity is optimized across different spatial levels.
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
This configuration enhances the alignment and performance of light emitting elements, improving the display device's efficiency and reliability by ensuring proper alignment and minimizing defects, leading to better light emission and extended lifespan.
Implementation Method 1
If a voltage may be supplied to first and second electrodes of the pixel, an electric field may be formed between the first and second electrodes, and the light emitting elements may be self-aligned between the first and second electrodes.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area, and pixels disposed in the display area. The pixels each include first electrodes, second electrodes spaced apart from the first electrodes, and light emitting elements disposed between the first electrodes and the second electrodes. The first electrodes each include a closed loop of a polygonal shape in some sections.