DC-Driven Full-Color LED Display with Asymmetric Alignment
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Solution Overview
Problem
Conventional full-color LED displays face challenges in achieving sufficient front luminance due to random alignment of LED elements, which results in side light emission, and are limited to alternating current (AC) power driving, making it difficult to control the alignment of semiconductor layers for improved light emission efficiency.
Innovation Solution
A direct-current-drivable LED display is developed, featuring a lower electrode line with alignment guides and asymmetric LED structures that allow precise alignment of LED elements on electrodes, enabling efficient light emission and DC power driving, with the use of asymmetric faces and alignment guides to control the mounting direction of LED elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
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 due to side light emission
Solution Approach 1:
The patent introduces asymmetric electrode structures with different potentials applied to electrodes at different heights, creating a three-dimensional electric field that directs LED element orientation. The asymmetric potential distribution causes the rod-type LED elements to align vertically with their major axis perpendicular to the substrate, transforming the mounting orientation from horizontal to upright, thereby directing light emission toward the front surface and improving front luminance while maintaining self-alignment capabilities
2Ease of manufacture
If alternating current (AC) power is applied to two electrodes, then self-alignment of LED elements is achieved, but direct current (DC) driving is not possible
Solution Approach 1:
The patent employs dynamic potential control where different potentials are applied to electrodes at different heights, creating a time-varying or spatially-varying electric field that guides the self-alignment process. This dynamic field configuration enables the system to achieve self-alignment during manufacturing while also supporting DC operation during normal display driving, as the alignment is established during the manufacturing process rather than requiring continuous AC switching during operation
3Ease of manufacture
If LED elements are aligned randomly on electrodes, then manufacturing is simplified, but light emission efficiency is reduced due to misalignment of semiconductor layers
Solution Approach 1:
The patent introduces an intermediate electric field as a mediator between the electrodes and LED elements during the self-alignment process. This electric field acts as a guiding force that directs the rod-type LED elements to orient themselves with their major axis perpendicular to the substrate surface, ensuring proper alignment of the semiconductor layers (n-type and p-type) with the electrodes. This intermediary field enables automated alignment without complex mechanical positioning, maintaining manufacturing simplicity while achieving optimal light emission efficiency through proper layer alignment
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 enhances front luminance and light emission efficiency by aligning LED elements for improved light distribution, allowing for DC power operation and reducing electron-hole recombination inefficiencies, resulting in a higher luminance display.
Implementation Method 1
a shape of the second face and a shape of the first face, which is the first shape, are congruent with each other, but the shape of the first face and the shape of the second face have an asymmetric shape in which a symmetrical axis does not exist
Data Source
AI summary
The present disclosure relates to a full-color light-emitting diode (LED) display, and more particularly, to a full-color LED display that may be driven by direct current (DC) and a method of manufacturing the same.