OLED Encapsulation Coating with Gas-Cushion Curing Support
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Solution Overview
Problem
Existing OLED manufacturing techniques face challenges such as complexity, material waste, scalability limitations, and sensitivity to ambient materials, leading to degradation and non-uniform support issues that result in defects like mura and efficiency loss.
Innovation Solution
The use of controlled environment enclosures with gas cushions and uniform support techniques to minimize exposure to reactive species and ensure uniform substrate support during printing and curing processes, employing printing systems and modules that maintain controlled atmospheres to prevent degradation and enhance coating uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum deposition techniques are used to deposit organic films, then patterning can be achieved, but material waste increases and device complexity increases
Solution Approach 1:
The patent uses a shadowmask that is a physical stencil with cut-outs to define the pixel pattern. The shadowmask is placed in proximity to or in contact with the substrate, and organic material is deposited through the mask openings. This copying approach allows precise patterning while reducing material waste compared to other vacuum deposition methods, as the mask can be reused and material is deposited only where needed through the cut-outs.
Solution Approach 2:
The shadowmask acts as an intermediary element between the organic material source and the substrate. It mediates the deposition process by allowing material to pass through only in the desired pixel regions, enabling patterning without requiring complex direct-write deposition systems.
2Manufacturing precision
If shadowmask is used for direct patterning, then patterning precision is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The shadowmask is designed as a relatively simple, inexpensive component that can be easily replaced when worn or contaminated. Rather than investing in complex, expensive patterning equipment, the system uses a disposable-like mask that simplifies the overall deposition system while maintaining patterning precision.
3Ease of manufacture
If organic materials are exposed to ambient materials during fabrication, then processing simplicity increases, but device reliability decreases
Solution Approach 1:
The patent employs an inert atmosphere environment during the vacuum deposition process to prevent organic materials from degrading through exposure to oxygen and other reactive ambient species. The vacuum chamber provides this protective inert environment, allowing simple processing while maintaining high device reliability by preventing oxidation and contamination of the organic layers.
4Manufacturing precision
If uniform substrate support is implemented, then coating uniformity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a gas cushion (pneumatic support) to provide uniform support to the substrate during deposition. Gas is introduced between the substrate and the deposition surface, creating a cushion that ensures uniform spacing and prevents substrate deformation. This pneumatic approach achieves excellent coating uniformity without requiring complex mechanical support structures.
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 reduces material waste, improves scalability, and enhances the production of high-quality OLED devices by minimizing defects and maintaining efficiency, allowing for larger substrate sizes and improved display performance.
Implementation Method 1
The use of controlled environment enclosures with gas cushions and uniform support techniques to minimize exposure to reactive species
Implementation Method 2
employing printing systems and modules that maintain controlled atmospheres to prevent degradation and enhance coating uniformity
Implementation Method 3
printing and curing processes
Data Source
AI summary
A method for providing a substrate coating comprises transferring a substrate to an enclosed ink jet printing system; printing organic material in a deposition region of the substrate using the enclosed ink jet printing system, the deposition region comprising at least a portion of an active region of a light-emitting device on the substrate; loading the substrate with the organic material deposited thereon to an enclosed curing module; supporting the substrate in the enclosed curing module, the supporting the substrate comprising floating the substrate on a gas cushion established by a floatation support apparatus; and while supporting the substrate in the enclosed curing module, curing the organic material deposited on the substrate to form an organic film layer.