Display Panel Organic Filling via Selective Surface Wettability
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Solution Overview
Problem
Existing methods for manufacturing organic light emitting display panels face challenges in improving yield due to overflow and incomplete filling of organic compositions during the formation of organic layers, which affect the reliability and efficiency of the manufacturing process.
Innovation Solution
A method involving the use of an auxiliary solvent to treat the pixel defining layer with a liquid-repellent treatment, followed by drying and heat-treating, ensures that the upper surface of the pixel defining layer has liquid repellency while maintaining lyophilicity on the pixel electrode, allowing precise application of organic compositions using inkjet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the organic composition is provided into the opening using conventional methods, then the manufacturing process is simple, but the organic composition overflows to the upper surface of the pixel defining layer or does not completely fill the opening
Solution Approach 1:
The liquid-repellent treatment is performed on the upper surface of the pixel defining layer before providing the organic composition into the opening. This preliminary modification of surface properties prevents overflow by creating a barrier that repels the organic composition, ensuring complete filling without spilling to the upper surface.
Solution Approach 2:
The surface energy parameters of the pixel defining layer are changed through liquid-repellent treatment, transforming the surface from hydrophilic to hydrophobic. This parameter change in surface wettability prevents the organic composition from adhering to and overflowing on the upper surface of the pixel defining layer.
2Manufacturing precision
If the upper surface of the pixel defining layer is made liquid-repellent to prevent overflow, then overflow is minimized, but the organic composition may not properly wet the pixel electrode surface
Solution Approach 1:
The liquid-repellent treatment is applied selectively only to the upper surface of the pixel defining layer, while the inner surface that contacts the pixel electrode maintains its original wetting properties. This local differentiation allows the organic composition to be repelled from the upper surface (preventing overflow) while still being able to wet the pixel electrode surface (ensuring proper contact).
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 minimizes overflow and incomplete filling of organic compositions, enhancing the yield and reliability of the display panel manufacturing process by ensuring accurate deposition of organic layers.
Implementation Method 1
performing a liquid-repellent treatment on an upper surface of the pixel defining layer, the upper surface of the pixel defining layer has liquid repellency with respect to the organic composition
Implementation Method 2
the auxiliary solvent may be discharged into the opening to cover the upper surface of the pixel electrode when providing the auxiliary solvent into the opening
Implementation Method 3
a fluorine group may be introduced on one surface of the pixel defining layer when performing the liquid-repellent treatment, a reactive gas containing a fluorine compound may be used when performing the liquid-repellent treatment
Implementation Method 4
drying and heat-treating the auxiliary solvent and drying and heat-treating the organic composition to form the organic layer may be performed at a pressure of about 10-5 Torr to about 1 Torr and at a temperature of about 25 degrees in Celsius (° C.) to about 150° C.
Data Source
AI summary
A method of manufacturing a display panel includes forming a pixel defining layer defining an opening exposing an upper surface of a pixel electrode on a substrate on which the pixel electrode is formed, providing an auxiliary solvent into the opening, performing a liquid-repellent treatment on an upper surface of the pixel defining layer, removing the auxiliary solvent from the opening and providing an organic composition including an organic solvent into the opening.