OLED Display Fluorine Polymer Layer Defect Reduction
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Solution Overview
Problem
Existing OLED display device manufacturing methods face challenges in forming organic layers without defects, particularly due to the formation of organic layers in non-emission regions, which affects device yield and quality.
Innovation Solution
A fluorine-based polymer layer is used to improve the surface properties of a first electrode by patterning a pixel defining layer, allowing for the formation of an organic layer on exposed areas, thereby reducing contamination and defects, and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If organic layers are formed using conventional patterning methods (ink-jet printing or deposition), then the emission layer can be patterned, but organic layers are also formed in non-emission regions which generates defects and reduces production yield
Solution Approach 1:
The patent segments the formation process into two distinct stages: first forming the pixel defining layer to define emission regions, then forming the organic layer only in exposed non-emission regions. This segmentation prevents organic layer formation in non-emission regions, eliminating defects while maintaining production efficiency
Solution Approach 2:
The pixel defining layer is formed in advance before the organic layer deposition. This preliminary action creates a mask that prevents organic material from depositing in non-emission regions, thereby preventing defects before they occur and maintaining high production yield
2Ease of manufacture
If a pixel defining layer is formed using photoresist material, then patterning can be achieved, but the surface properties of the first electrode need improvement to prevent contamination and defects
Solution Approach 1:
A fluorine-based polymer layer is introduced as an intermediary between the photoresist pixel defining layer and the organic layer. This polymer layer improves surface properties by reducing contamination and preventing defects, while the photoresist layer continues to provide easy patterning capabilities
Solution Approach 2:
The patent uses a composite structure combining photoresist material for patterning with fluorine-based polymer material for surface property improvement. This composite approach leverages the advantages of both materials: easy patterning from photoresist and contamination resistance from the fluorine polymer
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 use of a fluorine-based polymer layer enhances the surface properties of the first electrode, reduces defects, and improves production yield by preventing contaminant diffusion and simplifying the patterning process in OLED display device manufacturing.
Implementation Method 1
a fluorine-based polymer layer is formed on a pixel defining layer to prevent diffusion of contaminants such as organic materials and water, and thus defects generated in fabrication of the OLED display device may be reduced
Data Source
AI summary
The OLED display device includes a substrate, a first electrode located on the substrate, a pixel defining layer located on the first electrode to expose a part of the first electrode, a fluorine-based polymer layer located on the pixel defining layer, an organic layer located on the first electrode, and a second electrode located on the entire surface of the substrate. The method of manufacturing the OLED display device includes forming a first electrode on a substrate, forming a pixel defining layer on the first electrode, forming a fluorine-based polymer layer on the pixel defining layer, patterning the fluorine-based polymer layer and the pixel defining layer by laser ablation to open a part of the first electrode, forming an organic layer on the opened first electrode, and forming a second electrode on the entire surface of the substrate.