OLED Deposition Nozzle with Offset Exhaust for Single-Pass Uniformity
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Solution Overview
Problem
Conventional organic vapor jet printing (OVJP) methods struggle to achieve uniform thickness profiles for organic light-emitting diode (OLED) deposition, requiring multiple passes and increasing the risk of contamination and reducing operational lifetime.
Innovation Solution
A depositor with a split delivery aperture and offset exhaust apertures is used, allowing for a single pass deposition that creates a more uniform trapezoidal profile, reducing the need for multiple passes and minimizing contamination exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OVJP methods are used for OLED deposition, then the deposition process can be completed, but the thickness profile is non-uniform requiring multiple passes
Solution Approach 1:
The delivery aperture is divided into multiple segmented apertures arranged in a specific pattern, allowing different regions to contribute material that combines into a uniform thickness profile. This segmentation enables a single pass to achieve what previously required multiple passes.
Solution Approach 2:
The aperture arrangement and exhaust positioning create an asymmetric flow pattern that compensates for natural deposition gradients. The asymmetric configuration of delivery and exhaust apertures produces a tailored vapor distribution that results in uniform thickness across the substrate.
2Manufacturing precision
If multiple deposition passes are used to achieve uniform thickness, then thickness uniformity is improved, but contamination risk increases
Solution Approach 1:
The segmented aperture design enables complete deposition in a single pass, eliminating the intermediate states where partially deposited layers are exposed to contamination. All material is deposited simultaneously rather than in sequential layers.
Solution Approach 2:
The process rushes through the deposition event in a single rapid pass rather than lingering across multiple passes. This minimizes the total time the substrate and deposited material are exposed to the vacuum environment and potential contamination sources.
3Manufacturing precision
If multiple deposition passes are performed, then thickness uniformity is achieved, but processing time increases
Solution Approach 1:
The segmented aperture configuration delivers all required material in one pass, eliminating the time lost between multiple deposition cycles including substrate repositioning, pump-down, and system stabilization that would occur with repeated passes.
Solution Approach 2:
The deposition action continues uninterrupted in a single continuous pass rather than being interrupted between multiple passes. The segmented apertures work simultaneously to deposit the complete uniform layer without pause or repositioning.
4Manufacturing precision
If conventional single aperture design is used, then device complexity is low, but deposition uniformity is poor
Solution Approach 1:
While increasing complexity from a single to multiple apertures, the segmentation creates a systematic arrangement where each aperture has a defined role. The complexity is structured and purposeful, delivering significant uniformity improvements that justify the added aperture elements.
Solution Approach 2:
The aperture design transitions from a single-point source to a distributed array across two dimensions. This dimensional expansion allows spatial distribution of material sources to create uniform deposition patterns that cannot be achieved with a single aperture.
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 depositor geometry enhances deposition uniformity, reduces processing time, and improves the operational lifetime of OLEDs by minimizing the time between initiation and completion of emissive layer deposition.
Implementation Method 1
Organic vapor jet printing (OVJP) methods struggle to achieve uniform thickness profiles for organic light-emitting diode (OLED) deposition
Data Source
AI summary
A deposition nozzle is provided that includes offset deposition apertures disposed between exhaust apertures on either side of the deposition apertures. The provided nozzle arrangements allow for deposition of material with a deposition profile suitable for use in devices such as OLEDs.