Vapor Flow Barriers for High-Density OLED Cell Deposition
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Solution Overview
Problem
Existing techniques for constructing organic optoelectronic devices, such as OLEDs, face challenges in precisely depositing different compositions of organic materials without cross-contamination and achieving high-density, sharply defined cell structures, particularly in vapor printing processes.
Innovation Solution
The use of vapor flow barriers on the substrate surface to contain and separate organic materials during deposition, combined with print head features to capture stray material, allows for controlled vapor flow and precise definition of cell areas, enabling high-density, tightly-packed optoelectronic devices with distinct organic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vapor printing is used to deposit organic materials, then deposition efficiency is improved, but cross-contamination between adjacent cell areas increases
Solution Approach 1:
The substrate surface is segmented into distinct cell areas by vapor flow barriers, which physically divide the deposition zone. This segmentation prevents vaporized organic material from one cell area from contaminating adjacent cell areas, while still allowing efficient vapor printing deposition within each segmented region.
Solution Approach 2:
Vapor flow barriers act as intermediary structures between adjacent cell areas. These barriers intercept and redirect vapor flow, serving as a mediator that prevents direct cross-contamination while maintaining the overall vapor printing process efficiency.
2Measurement precision
If high-density cell structures are produced, then device resolution is improved, but manufacturing precision deteriorates
Solution Approach 1:
Vapor flow barriers are pre-positioned on the substrate surface before organic material deposition. This preliminary action defines the exact boundaries of cell areas in advance, ensuring that subsequent high-density deposition produces sharply defined edges without manufacturing precision loss.
Solution Approach 2:
The vapor flow barriers provide localized control over vapor deposition, creating distinct zones with different deposition characteristics. Each cell area receives controlled material deposition with sharp boundaries, enabling high-density structures while maintaining precise edge definition.
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 enables the production of organic optoelectronic devices with sharply defined edges and separate organic layers, reducing cross-contamination and allowing for higher resolution and commercial applicability in displays like high-definition flat panels.
Implementation Method 1
controlling the flow of the organic vapor-containing gas after it impinges the surface of the substrate
Implementation Method 2
vapor printing processes
Data Source
AI summary
An organic optoelectronic device (OED) includes a plurality of OED cells separated by a vapor flow barrier that extends away from a substrate surface. The vapor flow barrier partially defines an OED cell area and helps prevent stray organic material deflected away from the substrate surface during deposition from being deposited outside the cell area. An organic vapor jet (OVJ) print head can be used to deposit organic material along the vapor flow barrier and may include one or more features configured to capture some of the stray organic material. A method that includes use of vapor flow barriers and/or capturing stray organic material can facilitate high-density printing of OED cells such as OLEDs with sharply defined edges and without cross-contamination among adjacent cells.