OLED Display Panel Double-Layer Polyimide Flexible Layer
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Solution Overview
Problem
In OLED display panels, the polyimide (PI) solution's hydrophobicity makes it difficult to spread evenly on glass substrates and inorganic SiNx layers, leading to uneven thickness and a risk of the PI film peeling off during bending, affecting product yield and flexibility.
Innovation Solution
A double-layer polyimide flexible layer structure is introduced, with first and second wetting layers converting the glass substrate and inorganic silicon nitride layer from hydrophilic to hydrophobic, allowing for uniform coating and curing of the PI film, comprising quaternary ammonium salt, sodium dodecyl sulfate, or polyvinyl chloride amphiphilic surfactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If PI solution is coated on glass substrate and inorganic SiNx layer, then the flexible OLED display panel can be formed, but the PI film thickness becomes uneven and the film peels off during bending due to hydrophobicity mismatch
Solution Approach 1:
A wetting layer is introduced as an intermediary between the hydrophilic glass substrate/inorganic SiNx layer and the hydrophobic PI solution. This wetting layer has intermediate surface properties that enable the PI solution to spread uniformly and adhere properly, resolving both the thickness uniformity and adhesion issues caused by the hydrophobicity mismatch.
2Manufacturing precision
If double-layer PI structure with wetting layers is used, then PI film uniformity and adhesion are improved, but the device structure becomes more complex
Solution Approach 1:
The wetting layer is applied in advance to the glass substrate and inorganic SiNx layer before coating the PI solution. This preliminary action modifies the surface properties to ensure subsequent PI film uniformity and adhesion, achieving the technical benefits while keeping the process sequence straightforward.
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 ensures a uniform PI film thickness, enhances product yield, and reduces the risk of the PI film falling off during bending, improving the OLED display panel's flexibility and durability.
Implementation Method 1
first and second wetting layers converting the glass substrate and inorganic silicon nitride layer from hydrophilic to hydrophobic
Implementation Method 2
coating a certain thickness of PI solution on the glass substrate, and solvent is volatilized to form a PI hard film
Data Source
AI summary
An organic light emitting diode (OLED) display panel and a method of fabricating the same are provided. The OLED display panel includes a double-layer polyimide flexible layer, a thin film transistor driving layer, an OLED light emitting layer, and a thin film encapsulation layer. The double-layer polyimide flexible layer includes a glass substrate, a wetting layer, a polyimide flexible layer, and an inorganic silicon nitride layer. The wetting layer converts the glass substrate or the inorganic silicon nitride layer from hydrophilic to hydrophobic.