Exhaust System Between Nozzles for Organic Vapor Jet Deposition
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Solution Overview
Problem
In organic vapor jet deposition (OVJD) systems, the lack of control over material deposition leads to spreading and mixing of materials from adjacent nozzles, resulting in undesirable deposition profiles and reduced resolution, particularly in the fabrication of organic light-emitting devices (OLEDs).
Innovation Solution
The implementation of an exhaust system between adjacent nozzles creates a localized vacuum, reducing pressure and improving resolution and deposition profiles by maintaining a controlled deposition area, which can be connected to either ambient vacuum or an independent vacuum source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If material is deposited from adjacent nozzles without pressure control, then deposition rate is maintained, but material spreading and mixing occurs resulting in reduced resolution
Solution Approach 1:
The patent divides the deposition chamber into multiple independent pressure zones, with each nozzle operating in its own controlled atmosphere. This segmentation prevents material spreading between nozzles while maintaining individual deposition control, directly resolving the resolution vs. system complexity contradiction.
Solution Approach 2:
The patent introduces exhaust ports as intermediary elements between nozzles that actively manage pressure and material flow. These exhaust ports serve as mediators that control the deposition environment without requiring complex real-time coordination between nozzles, improving resolution while limiting complexity increase.
2Manufacturing precision
If exhaust is added between nozzles to control pressure, then deposition resolution improves, but device complexity increases
Solution Approach 1:
The patent combines multiple exhaust ports into a single integrated exhaust system that serves all nozzles simultaneously. This merging approach allows the exhaust system to manage pressure across multiple deposition zones without requiring separate exhaust controls for each nozzle, improving deposition profile control while minimizing the increase in device complexity.
Solution Approach 2:
The exhaust system is designed to perform multiple functions: controlling pressure between nozzles, preventing material mixing, and maintaining deposition resolution. This multi-functionality reduces the need for additional separate systems, achieving improved deposition profile control without proportional increases in device complexity.
3Manufacturing precision
If multiple nozzles operate simultaneously without pressure management, then productivity is maintained, but material mixing reduces manufacturing precision
Solution Approach 1:
The patent establishes predetermined pressure differentials between deposition zones before material ejection occurs. By pre-configuring the pressure environment in each zone, the system ensures that materials from adjacent nozzles remain separated during deposition, maintaining pixel area definition without requiring complex real-time coordination that would reduce throughput.
Solution Approach 2:
The patent uses pneumatic pressure control to manage material flow and prevent mixing between nozzles. By utilizing pressure differentials created through exhaust ports, the system maintains clear boundaries between deposited materials while allowing multiple nozzles to operate simultaneously, preserving both manufacturing precision and productivity.
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 approach enhances the resolution and control of material deposition, achieving sharper and more defined pixel areas, thereby improving the overall quality and precision of OLED fabrication.
Implementation Method 1
The implementation of an exhaust system between adjacent nozzles creates a localized vacuum, reducing pressure and improving resolution and deposition profiles
Data Source
AI summary
Methods and systems for organic vapor jet deposition are provided, where an exhaust is disposed between adjacent nozzles. The exhaust may reduce pressure buildup in the nozzles and between the nozzles and the substrate, leading to improved deposition profiles, resolution, and improved nozzle-to-nozzle uniformity. The exhaust may be in fluid communication with an ambient vacuum, or may be directly connected to a vacuum source.