OLED Encapsulation via Self-Assembled Hydrophobic Layer
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Solution Overview
Problem
Current OLED display panels have poor reliability due to moisture ingress, resulting from inadequate encapsulation structures that fail to provide effective contact with display elements.
Innovation Solution
A manufacturing method involving a light-emitting element coated with a polymer solution followed by an annealing process to form a first protecting layer, and then an organic compound solution with a crosslinking three-dimensional network structure formed through self-assembly, which includes aromatic hydrocarbon derivatives with carboxylic acid amide groups, to create a hydrophobic and mechanically robust second protecting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation cover is disposed on OLED elements to encapsulate display elements, then the display elements are protected from moisture, but the encapsulation structure and display elements have poor contact, resulting in poor reliability
Solution Approach 1:
A hydrophobic layer is formed on the encapsulation substrate before the encapsulation process. This preliminary action ensures that when the encapsulation structure is assembled, the hydrophobic layer is already in place to prevent moisture ingress at the interface between the encapsulation substrate and display elements, eliminating the contact poor problem
Solution Approach 2:
The surface properties of the encapsulation substrate are modified by forming a hydrophobic layer with specific surface energy characteristics. This parameter change in surface wettability ensures better interfacial contact and prevents moisture penetration at the encapsulation interface
2Ease of manufacture
If a simple encapsulation structure is used, then the manufacturing process is simple, but moisture can easily enter the display panel, resulting in poor performance
Solution Approach 1:
The encapsulation structure uses a composite approach by forming a hydrophobic layer on the encapsulation substrate. This composite structure combines the encapsulation substrate with the hydrophobic functional layer, providing both structural support and moisture barrier functionality, thereby improving reliability while maintaining manufacturing simplicity
3Ease of manufacture
If the encapsulation structure has poor contact with display elements, then the manufacturing process is easier, but moisture enters the display panel, resulting in poor performance
Solution Approach 1:
The hydrophobic layer is formed on the encapsulation substrate before assembly. This preliminary action ensures that when the encapsulation structure is assembled, the hydrophobic layer is already positioned to prevent moisture penetration at the interface, achieving both easy assembly and effective moisture 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
The method enhances the reliability of OLED display panels by reducing moisture damage and improving mechanical strength and heat resistance, while maintaining good light transmittance and self-healing capabilities.
Implementation Method 1
coating an organic compound solution on the first protecting layer, and making the organic compound solution self-assembled on the first protecting layer to form a second protecting layer
Implementation Method 2
subjecting the one-dimensional structure to a second annealing process at an annealing temperature ranging from 25 degrees Celsius to 70 degrees Celsius to form the second protecting layer
Implementation Method 3
coating a polymer solution on the light-emitting element followed by subjecting the light-emitting element to a first annealing process to the light-emitting element to form a first protecting layer
Implementation Method 4
the organic compound comprises an aromatic hydrocarbon derivative having a carboxylic acid amide group
Data Source
AI summary
A display panel and a manufacturing method thereof are provided. The manufacturing method of the display panel include following blocks: providing a light-emitting element; coating a polymer solution on a light-emitting element and performing a first annealing process to the light-emitting element after it is coated with the polymer solution to form a first protecting layer; and coating an organic compound solution on the first protecting layer so that the organic compound solution is self-assembled on the first protecting layer to form a second protecting layer, wherein the second protecting layer has a crosslinking three-dimensional network structure.