OLED Packaging Nano Rod Buffer Layer Integration
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Solution Overview
Problem
Existing packaging technologies for organic electroluminescent devices (OLEDs) face challenges due to separation between inorganic and organic polymer thin films, allowing oxygen and water vapor to penetrate and reduce the service life of OLEDs.
Innovation Solution
A packaging structure comprising a base substrate with at least one first thin film packaging layer consisting of an inorganic thin film, an organic polymer thin film, and a nano rod-shaped thin film between the inorganic and organic polymer thin films, which are closely bonded to prevent separation and enhance integration, and optionally a second thin film packaging layer above or below the first layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer structure with inorganic thin film and organic polymer thin film is used for packaging OLED, then water and oxygen barrier performance is improved, but film separation occurs due to internal stress and elasticity mismatch
Solution Approach 1:
The patent introduces a buffer layer between the inorganic thin film and organic polymer thin film. This buffer layer acts as an intermediary that absorbs internal stress and reduces the elasticity mismatch between the two films, preventing separation while maintaining the barrier performance of the inorganic film and the flexibility of the organic polymer film.
Solution Approach 2:
The patent creates a composite packaging structure by combining inorganic thin film, organic polymer thin film, and buffer layer into a multilayer composite. This composite structure leverages the high barrier performance of inorganic materials while incorporating the flexibility and stress-absorption capabilities of organic and buffer materials, achieving both water/oxygen barrier and film stability.
2Object-affected harmful factors
If inorganic thin film is used as main barrier layer, then water and oxygen permeation is reduced, but internal stress increases causing film separation
Solution Approach 1:
The buffer layer serves as a stress-absorbing intermediary between the rigid inorganic thin film and the flexible organic polymer film. It reduces the transmission of internal stress from the inorganic film to the organic film, preventing separation while allowing the inorganic film to maintain its high barrier performance against water and oxygen permeation.
3Stability of the object's composition
If organic polymer thin film is used for packaging, then elasticity and flexibility are improved, but barrier performance against water and oxygen is insufficient
Solution Approach 1:
The patent merges the advantages of different materials by combining organic polymer thin film (providing elasticity and flexibility) with inorganic thin film (providing water and oxygen barrier performance) in a multilayer structure. The buffer layer facilitates the integration of these materials with different properties, allowing the organic film to provide flexibility while the inorganic film provides barrier protection.
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 configuration effectively prevents oxygen and water vapor ingress, thereby extending the service life of OLEDs while maintaining light intensity and display quality.
Implementation Method 1
a vacuum coating process
Implementation Method 2
the inorganic thin film is a main layer to barrier water and oxygen
Data Source
AI summary
A packaging structure and a packaging method of an organic electroluminescent device, and a display device are provided. The packaging structure of the organic electroluminescent device comprises: a base substrate (1) for supporting the organic electroluminescent device (2); the organic electroluminescent device (2) located on the base substrate (1); at least one first thin film packaging layer (3) covering the organic electroluminescent device (2), the first thin film packaging layer (3) comprising an inorganic thin film (31), an organic polymer thin film (32) and a nano rod-shaped thin film (33) located between the inorganic thin film (31) and the organic polymer thin film (32). The packaging structure and the packaging method of the organic electroluminescent device can effectively improve a degree of integration between the inorganic thin film (31) and the organic polymer thin film (32), thus guaranteeing a service life of an OLED device.