Asymmetric LED Structure for Self-Aligned Direct-Current Driving
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Solution Overview
Problem
Current LED technologies face challenges in aligning nano- or micro-LED elements on electrodes, leading to inefficient front luminance due to random alignment of semiconductor layers and side surface dominance in light emission, limiting the use of direct-current driving and requiring additional configurations for self-alignment.
Innovation Solution
A light-emitting diode (LED) structure with an asymmetric face, where the first and second conductive semiconductor layers are stacked in a specific direction, allowing for upright mounting and alignment without additional configurations, using an ink composition and alignment guide member to ensure proper placement and contact with electrodes, enabling direct-current drivability and enhanced front luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rod-type LED elements are mounted lying on horizontal electrodes in the major-axis direction, then self-alignment is achieved through electric field, but front luminance is insufficient and side surface emission dominates
Solution Approach 1:
The patent introduces an asymmetric configuration by adding a magnetizable layer to one end of the LED element (creating a magnetic pole) while leaving the other end without this layer (creating an opposite magnetic pole). This asymmetric magnetic polarity, combined with the asymmetric electrode arrangement (first electrode below, second electrode above), enables the LED to be mounted upright in the stacking direction rather than lying down, thereby achieving both self-alignment and enhanced front luminance
2Manufacturing precision
If additional configurations such as magnetic layers are added for self-alignment, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The patent applies asymmetry by selectively forming the magnetizable layer only at one end of the LED element, creating asymmetric magnetic poles. This asymmetric design enables precise alignment through magnetic attraction to the asymmetric electrode arrangement while adding minimal structural complexity compared to symmetric configurations that would require more complex alignment mechanisms
Solution Approach 2:
The magnetizable layer enables the LED element to self-align through magnetic attraction to the electrodes without requiring external alignment equipment or complex mounting processes. The asymmetric magnetic poles automatically orient the LED in the correct upright position during mounting
3Illumination intensity
If LED elements are mounted upright in the stacking direction, then front luminance is enhanced, but alignment and mounting precision becomes more difficult to achieve
Solution Approach 1:
The patent combines asymmetric magnetic polarity (magnetizable layer at one end only) with asymmetric electrode arrangement (first electrode below, second electrode above) to create a unique magnetic-geometric fingerprint. This dual asymmetry enables precise upright mounting by providing both magnetic attraction force and geometric orientation guidance, making it easy to achieve mounting precision while maintaining enhanced front luminance
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 allows for improved light emission efficiency by minimizing surface defects and optimizing electron-hole recombination, increasing front luminance and enabling direct-current drivability of LED assemblies, while maintaining the LED structure's integrity and reducing electron-hole velocity imbalances.
Implementation Method 1
an electron-hole recombination rate is optimized
Data Source
AI summary
The present disclosure relates to a light-emitting diode (LED) structure, and more particularly, to an LED structure having an asymmetric face, a method of manufacturing a direct-current-drivable LED electrode assembly using the same, and a direct-current-drivable LED electrode assembly manufactured thereby.