OLED Pixel Defining Layer Melting for Emission Layer Protection
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Solution Overview
Problem
Existing methods for manufacturing organic light-emitting display apparatuses often result in damage or defects during the formation of the emission layer, making it difficult to achieve a reliable and defect-free structure.
Innovation Solution
The solution involves forming a pixel electrode with a reverse-tapered pixel defining layer that is later melted to create a tapered shape, allowing the emission layer to be formed with reduced defects and enabling continuous opposite electrodes to be applied over both the pixel defining layer and the emission layer, thereby minimizing damage and enhancing manufacturing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (deposition, inkjet printing, LITI) are used to form the emission layer, then the emission layer can be formed, but damage and defects occur in the emission layer
Solution Approach 1:
The pixel defining layer is formed with a reverse-tapered shape before emitting the emission layer, creating a protective structure in advance that prevents damage during subsequent manufacturing steps. This preliminary structural preparation ensures the emission layer can be formed without direct exposure to potential damage sources.
Solution Approach 2:
The pixel defining layer acts as an intermediary protective structure between the pixel electrode and the emission layer. By melting this intermediate layer to create a tapered shape, it provides mechanical protection and structural support during emission layer formation, preventing defects without directly interfering with the emission layer deposition process.
2Reliability
If the pixel defining layer is formed with a reverse-tapered shape to protect the emission layer, then emission layer damage is reduced, but additional manufacturing steps are required
Solution Approach 1:
The pixel defining layer undergoes a parameter change through melting, transforming from a reverse-tapered shape to a tapered shape. This phase/shape transformation is achieved by controlling the melting process, which simplifies the overall structure and enables continuous electrode formation while maintaining protective functions.
Solution Approach 2:
The pixel defining layer transitions from a static reverse-tapered shape to a dynamic tapered shape through the melting process. This dynamic transformation allows the structure to adapt its form to serve multiple functions: initial protection during emission layer formation, then final structural support enabling continuous electrode deposition.
3Productivity
If the opposite electrode is formed continuously over the pixel defining layer and emission layer, then manufacturing efficiency is improved, but the structure becomes more complex to manufacture
Solution Approach 1:
The pixel defining layer is prepared in advance with a reverse-tapered shape that, after melting, creates a tapered structure suitable for receiving continuous electrodes. This preliminary preparation ensures that when continuous electrode formation is performed, the underlying structure is already optimized to accommodate this process, reducing manufacturing complexity.
Solution Approach 2:
The pixel defining layer exhibits different shapes at different locations: reverse-tapered during emission layer formation for protection, and tapered after melting for electrode formation. This local quality variation in different manufacturing stages allows the same structure to serve multiple functional requirements without increasing overall manufacturing difficulty.
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 reduces damage and defects in the emission layer, improving the manufacturing process and increasing the yield of organic light-emitting display apparatuses by ensuring a clean transfer of the emission layer and continuous electrode formation.
Implementation Method 1
melting the pixel defining layer such that the area of the upper surface becomes equal to or less than the area of the lower surface
Data Source
AI summary
An organic light-emitting display apparatus in which damages or defects are decreased when forming an emission layer, and a method of manufacturing the organic light-emitting display apparatus includes: a pixel electrode; an emission layer disposed on the pixel electrode and is capable of emitting light; a pixel defining layer that covers at least a portion of an edge of the emission layer such that a center portion of the emission layer is exposed; and an opposite electrode continuously formed over and across the pixel defining layer and the emission layer.