Organic Light Emitting Display Panel Base Dam Power Electrode Encapsulation
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Solution Overview
Problem
In organic light emitting display devices, the encapsulation layer fails to effectively prevent organic material from flowing to unnecessary areas, leading to exposure and vulnerability to air and moisture, which compromises the reliability of the sealing mechanism.
Innovation Solution
The use of a partition wall structure with multiple dams and a layered encapsulation approach, including inorganic and organic layers, to control the flow of organic materials and prevent exposure, while also reducing the bezel width for increased display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the non-display area is reduced to increase display area, then the display area increases, but the surface area of elements in the non-display area becomes smaller
Solution Approach 1:
The non-display area is segmented into multiple functional zones: a first non-display area containing power electrodes and a second non-display area containing encapsulation structures. This segmentation allows optimized space utilization in each zone, enabling the power electrodes to be positioned in the first non-display area while the encapsulation layer extends into the second non-display area, thus maintaining adequate element areas despite overall reduction of the non-display area.
Solution Approach 2:
The encapsulation layer is extended in the vertical dimension to cover the power electrode from above, rather than relying solely on horizontal spacing. The encapsulation layer includes an organic layer and an inorganic layer that vertically overlay the power electrode, effectively utilizing the third dimension to contain organic material within a confined horizontal footprint.
2Ease of manufacture
If the encapsulation layer structure is simplified, then the manufacturing process becomes easier, but organic material may flow to unnecessary areas and expose the organic layer to air and moisture
Solution Approach 1:
The encapsulation layer employs a composite structure combining an organic layer and an inorganic layer. The organic layer provides a base encapsulation barrier, while the inorganic layer deposited on top of it provides enhanced protection against moisture and oxygen penetration. This composite approach achieves superior sealing effectiveness without requiring overly complex manufacturing processes, as both layers can be deposited using standard thin-film deposition techniques.
Solution Approach 2:
The inorganic layer acts as an intermediary barrier between the organic layer and the external environment. It prevents moisture and oxygen from reaching the organic layer, while also providing a surface that is less susceptible to organic material diffusion. This intermediary structure enhances reliability by creating multiple defensive barriers against degradation pathways.
3Device complexity
If the encapsulation layer covers only the organic light emitting element, then the structure remains simple, but organic material diffusion to the power electrode area is not prevented
Solution Approach 1:
The encapsulation layer is designed to serve multiple functions: it encapsulates the organic light emitting element to prevent degradation, and simultaneously confines organic material within the display area by extending over the power electrode in the non-display area. This multi-functional design prevents organic material diffusion without significantly increasing device complexity, as it extends the same encapsulation concept to a broader area.
Solution Approach 2:
The encapsulation layer is positioned to preemptively block the diffusion path of organic material before it can reach the power electrode. By extending the encapsulation layer over the power electrode area during the formation process, the structure creates a preliminary barrier that prevents organic material from migrating to unnecessary areas, thereby eliminating the need for additional containment structures.
Data Source
AI summary
An organic light emitting display panel includes an organic light emitting element, an encapsulation layer sealing the organic light emitting element, a power electrode providing a power voltage to the organic light emitting element, and a partial wall preventing an organic material from flowing while the encapsulation layer is formed. The partition wall includes a base dam covering one side of the power electrode, a first dam covering one side of the base dam, a second dam covering the other side of the base dam, a third dam covering one side of the first dam, and a fourth dam covering one side of the second dam.