Post Enhanced Diodes for Fluidic Assembly Orientation Control
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Solution Overview
Problem
The manufacturing of LED displays faces challenges with low throughput and yield due to the formation and placement of a large number of diodes, often resulting in defects and increased costs, as existing methods require additional redundancy to ensure diode functionality.
Innovation Solution
The development of a fluidic assembly system that uses post enhanced diodes with orientation control properties, where a post is formed over a diode stack structure, allowing for non-inverted orientation deposition to reduce dislocation and flipping, thereby enhancing manufacturing efficiency and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of diodes are formed or placed at defined locations, then the display can achieve sufficient functionality, but the manufacturing throughput decreases and defects increase
Solution Approach 1:
The patent applies asymmetry by forming an asymmetric post structure on one side of the diode (the non-inverted side) that creates a mechanical keying feature. This asymmetric post prevents the diode from being placed in an inverted orientation during assembly, ensuring correct orientation without requiring symmetric features on both sides. The asymmetric geometry allows the diode to self-align and self-correct during placement, improving throughput while maintaining reliability.
2Reliability
If additional redundant diodes are added per pixel, then yield is enhanced to ensure sufficient functional diodes, but the manufacturing cost increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the asymmetric post structure on the diode during the manufacturing process, before assembly. This pre-configured asymmetric feature acts as a built-in orientation guide that prevents incorrect placement during assembly. By performing the orientation-control preparation in advance, the system eliminates the need for post-assembly correction or additional redundant diodes, thereby improving yield without increasing the quantity of diodes required.
3Ease of manufacture
If traditional diode assembly methods are used, then manufacturing process is simple, but dislocation and flipping of diodes occur frequently
Solution Approach 1:
The patent applies self-service by designing the asymmetric post structure to automatically guide the diode into the correct orientation during placement. The asymmetric geometry creates a mechanical interference fit that allows the diode to self-align and self-correct its orientation without requiring external alignment tools or complex positioning mechanisms. This self-aligning feature maintains process simplicity while dramatically improving orientation accuracy and reducing dislocation errors.
Data Source
AI summary
Embodiments are related to systems and methods for fluidic assembly, and more particularly to diodes offering orientation control properties in a fluidic assembly system.