Multilayer Encapsulation Thin-Film for Flexible OLEDs
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Solution Overview
Problem
Current multilayer encapsulation methods for organic devices, such as OLEDs, are limited by complex processing times due to the need for separate apparatuses for inorganic and organic thin film deposition, which increases overall processing time and restricts the use of flexible substrates.
Innovation Solution
A method and apparatus for alternately stacking inorganic and organic thin films, using metal oxides and polymers, deposited via atomic layer deposition and UV-curing, respectively, within the same apparatus, reducing processing time and improving flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate apparatuses are used for inorganic and organic thin film deposition, then each film can be formed with proper materials and methods, but the overall processing time is significantly increased
Solution Approach 1:
The patent combines the inorganic thin film deposition apparatus and organic thin film deposition apparatus into a single integrated apparatus. The inorganic film formation unit and organic film formation unit share a common chamber and substrate transfer system, allowing sequential deposition without removing the substrate from the chamber. This eliminates transfer time between separate apparatuses while maintaining the ability to form both film types with appropriate materials and methods.
2Reliability
If multiple separate deposition processes are used, then comprehensive encapsulation is achieved, but the complexity of the manufacturing process increases
Solution Approach 1:
The integrated apparatus is designed with multi-functional capabilities to perform both inorganic thin film deposition and organic thin film deposition within a single system. The apparatus includes an inorganic film formation unit for depositing barrier layers and an organic film formation unit for depositing flexible encapsulation layers, both controllable from a single system. This reduces process complexity while maintaining comprehensive encapsulation effectiveness.
3Reliability
If conventional encapsulation methods are used, then complete blocking of water vapor and oxygen is achieved, but the device thickness increases
Solution Approach 1:
The patent employs a composite multilayer structure combining inorganic thin films and organic thin films. The inorganic layers provide excellent water vapor and oxygen blocking properties with thin film thickness, while the organic layers provide flexibility and additional protection. This composite structure achieves complete blocking of water vapor and oxygen while maintaining overall device thinness and flexibility.
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 the fragility of inorganic thin films, enhances the flexibility and bending properties of the encapsulation thin-film, and effectively suppresses water vapor transmission by lengthening permeation paths, while maintaining the performance of organic devices.
Implementation Method 1
when the protective layer and the blocking layer are formed, thin films are formed by atomic layer deposition (ALD)
Implementation Method 2
an acrylic polymer polymerized by spray-coating an acrylic monomer followed by UV-curing
Data Source
AI summary
A multilayer encapsulation thin-film and a method and apparatus for preparing a multilayer encapsulation thin-film are provided. The multilayer encapsulation thin-film includes an inorganic thin film that includes a metal oxide, and an organic thin film that includes a polymer and is formed on the inorganic thin film, where the inorganic thin film and the organic thin film are alternately stacked in multiple layers.