Pixel Defining Layer Lyophobic Stability via Fluorinated Monolayer
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Solution Overview
Problem
Conventional methods for maintaining lyophobic performance of pixel defining layers in display substrates, such as those used in organic electroluminescent light-emitting diodes, are ineffective over time due to the transient nature of plasma treatments, which can be compromised by long-term processes or high-temperature annealing.
Innovation Solution
A method involving the formation of a basic pattern of inorganic material on a substrate, followed by a self-assembled fluorinated monomolecular layer using fluorooctyl trichlorosilane, which forms a covalent bond and maintains lyophobic performance without being affected by cleaning or annealing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plasma treatment is used to maintain lyophobic performance of pixel defining layer, then initial lyophobic performance is improved, but performance degrades over time due to transient nature
Solution Approach 1:
The invention changes the chemical composition of the pixel defining layer by incorporating fluorinated compounds (specifically fluorinated cyclic carbonate and fluorinated cyclic carboxylate) to fundamentally alter the surface energy parameters. This chemical modification maintains lyophobic performance (contact angle >90°) stably over time, resolving the transient degradation issue of plasma treatment by establishing a permanent chemical property rather than a temporary physical state.
Solution Approach 2:
The invention creates a composite pixel defining layer by combining organic resin base materials with specific fluorinated cyclic carbonate and fluorinated cyclic carboxylate compounds. This composite structure integrates the lyophobic properties of fluorinated compounds into the matrix of the pixel defining layer, ensuring long-term stability of contact angle and lyophobic performance through the synergistic effect of the composite material system.
2Reliability
If conventional pixel defining layer materials are used, then manufacturing is simple, but lyophobic performance cannot be maintained during high-temperature annealing
Solution Approach 1:
The invention introduces fluorinated cyclic carbonate and fluorinated cyclic carboxylate compounds with specific molecular structures and chemical properties that remain stable under high-temperature annealing conditions (up to 200°C or higher). These compounds maintain the contact angle above 90° even after thermal processing, resolving the issue of lyophobic performance degradation during annealing by selecting materials with appropriate thermal stability parameters.
3Reliability
If plasma treatment is applied repeatedly to maintain lyophobic performance, then contact angle is restored, but processing time and complexity increase
Solution Approach 1:
The invention incorporates fluorinated cyclic carbonate and fluorinated cyclic carboxylate compounds into the pixel defining layer during the initial coating and curing process, establishing permanent lyophobic properties before subsequent manufacturing steps. This preliminary incorporation eliminates the need for repeated plasma treatments to restore contact angle, reducing total processing time while maintaining consistent lyophobic performance throughout the manufacturing sequence.
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 ensures long-term maintenance of lyophobic performance and contact angles up to 110°, preventing degradation of the pixel defining layer during extended use or high-temperature processes.
Implementation Method 1
subjecting the first pattern to a surface treatment with a self-assembled monomolecular layer to form a fluorinated monomolecular layer on a surface of the first pattern
Implementation Method 2
which forms a covalent bond and maintains lyophobic performance without being affected by cleaning or annealing processes
Data Source
Figure 1~3a
Figure 3b~5a
Figure 5b~7b
AI summary
A method for preparing a display substrate, including forming a pixel defining layer (20) on a substrate (100), wherein forming the pixel defining layer(20) includes: forming a basic pattern (200) of the pixel defining layer on the substrate (100); the basic pattern (200) of the pixel defining layer comprises a first pattern (200a) of inorganic material, the first pattern (200a) being a top part of the basic pattern (200) of the pixel defining layer; subjecting the first pattern (200a) to a surface treatment with a self-assembled monomolecular layer to form a fluorinated monomolecular layer (210) on the surface of the first pattern, thereby forming the pixel defining layer (20). The lyophobic performance of the pixel defining layer formed by the method may be maintained for a long time.