Topological Steering Features for Fluidic LED Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The stochastic nature of fluidic assembly processes for LED devices leads to unpredictable and uncontrollable assembly of light emitting diodes on substrates, necessitating advanced systems and methods for manufacturing LED displays and devices.
Innovation Solution
A fluidic assembly process involving a substrate with a planar top surface and interconnect pads, a first film with wells exposing these pads, and a second film with steering features that guide LED disks into position, utilizing a suspension of carrier fluid and LED disks, where vacuum pressure and conductive traces ensure precise placement and electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stochastic fluidic assembly process is used to deposit LED devices into wells on a substrate, then the process is simple and easy to manufacture, but the assembly becomes unpredictable and uncontrollable
Solution Approach 1:
The patent applies preliminary action by pre-forming topological features (protrusions and recesses) on the substrate before the fluidic assembly process. These features are prepared in advance to guide and control the placement of LED devices, transforming the stochastic process into a controlled one while maintaining the simplicity of fluidic assembly.
Solution Approach 2:
The patent introduces topological features as an intermediary between the fluidic assembly process and the LED devices. These features act as mediators that interact with the LED devices during assembly, providing controlled placement without requiring complex assembly mechanisms, thus resolving the contradiction between manufacturing simplicity and assembly precision.
2Device complexity
If traditional fluidic assembly is used without topological features, then the process maintains simplicity, but placement precision and control are lost
Solution Approach 1:
The patent segments the substrate surface into distinct topological features (protrusions and recesses) that correspond to specific LED device placements. This segmentation provides precise placement guidance without complicating the overall assembly process, as each feature independently guides a specific device placement.
Solution Approach 2:
The patent introduces topological features that add a dimensional aspect to the substrate surface, creating protrusions and recesses that provide mechanical guidance for LED device placement. This dimensional addition improves placement precision without significantly increasing process complexity, as the features are integrated into the substrate structure.
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 method enables controlled and precise placement of LED disks on substrates, improving the predictability and efficiency of LED device assembly, enhancing the manufacturing process for LED displays and devices.
Implementation Method 1
where vacuum pressure and conductive traces ensure precise placement and electrical connection
Data Source
AI summary
Embodiments are related to integrated circuit (IC) fabrication and, more particularly, to a fluidic assembly process for the placement of light emitting diodes on a direct-emission display substrate.