Axial Micro-LED Fluidic Assembly for High Resolution Displays
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Solution Overview
Problem
The current micro-LED display assembly process is costly and inefficient due to the serial nature of the pick-and-place method, which is slow and prone to errors, and existing fluidic assembly techniques cannot achieve high enough resolution for modern display devices like tablets and smartphones.
Innovation Solution
The development of axial micro-light emitting diode (LED) devices with surface mount electrodes, allowing for fluidic assembly of high-resolution RGB displays by using gallium nitride (GaN) MOCVD wafers with vertically extended structures and optimized trap structures on the substrate for efficient emission area utilization, enabling the creation of displays with up to 800 pixels per inch (ppi).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pick-and-place method is used to assemble micro-LEDs, then each micro-LED can be individually positioned, but the assembly process becomes painfully slow and costly
Solution Approach 1:
The patent merges multiple micro-LEDs into arrays or blocks that are transferred together in single operations. Instead of placing individual micro-LEDs one by one, the system transfers groups of micro-LEDs simultaneously, maintaining positioning precision while dramatically increasing assembly throughput and reducing costs.
Solution Approach 2:
The patent prepares micro-LEDs in advance by organizing them into pre-assembled arrays or blocks on carrier substrates before the actual transfer process. This preliminary organization allows the assembly system to work with pre-packaged groups rather than individual components, improving both speed and efficiency.
2Ease of manufacture
If conventional assembly techniques are used, then the process is simple to implement, but the resolution achieved is insufficient for modern display devices
Solution Approach 1:
The patent transitions from two-dimensional planar transfer methods to three-dimensional vertical transfer techniques. By utilizing the vertical dimension for transferring micro-LED arrays through depth, the system achieves higher precision positioning capable of supporting modern display resolutions while maintaining manufacturing simplicity through automated fluidic processes.
3Productivity
If fluidic assembly is used to increase assembly speed, then productivity improves, but existing techniques cannot achieve high enough resolution
Solution Approach 1:
The patent replaces traditional mechanical pick-and-place systems with fluidic assembly mechanisms. Micro-LEDs are manipulated and transferred using fluid flows rather than mechanical grippers, enabling parallel transfer of multiple micro-LEDs at high speed while achieving the precision required for modern display resolutions through controlled fluid dynamics.
Data Source
AI summary
A fluidic assembly emissive display panel is presented with a plurality of wells exposing LED interfaces. Each LED interface is made up of a planar first interconnect platform having an x-axis first depth and is configured to accept an axial LED first electrode mounting wing. A planar second interconnect platform has the first depth and is configured to accept an axial LED second electrode mounting wing. A groove is interposed between the first and second interconnect platforms and has an x-axis second depth, greater than the first depth, and is configured to accept an axial LED body locking tooth. The axial LEDs have an inorganic LED body with two symmetrical locking teeth. First and second electrode mounting wings are electrically connected to corresponding LED interface first and second interconnect platforms, and aligned in a plane orthogonal to stacked LED body semiconductor layers.