Organic Insulating Dams Block Moisture Ingress in Display Devices
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, face issues with moisture and oxygen penetration through the organic encapsulation layer, leading to reduced light emission efficiency and shortened device lifespan due to the formation of edge tails during the encapsulation process.
Innovation Solution
The implementation of a display device design featuring dams and a blocking part in the peripheral areas, where the organic insulating layers are removed, prevents the organic layer from flowing to the edges, thereby blocking moisture and oxygen ingress. This design includes a stack of organic insulating layers and source metal patterns to structurally prevent the penetration of outside air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic encapsulation layer is extended to the edges of the display device, then the sealing effect is improved, but the organic layer flows to the edges forming edge tails that allow moisture and oxygen penetration
Solution Approach 1:
The encapsulation structure is segmented into a display area with organic encapsulation layer and a peripheral area with inorganic encapsulation layer. The organic insulating layers are removed in the peripheral area to prevent edge tail formation, while the display area maintains organic encapsulation for sealing. This segmentation allows each area to have optimized encapsulation materials for its specific function.
Solution Approach 2:
Different encapsulation structures are applied to different areas: the display area uses organic insulating layers for sealing, while the peripheral area uses inorganic insulating layers with removed organic layers to prevent edge tail formation. This local differentiation resolves the contradiction by optimizing each area's encapsulation properties for its specific requirements.
2Object-affected harmful factors
If the organic insulating layers are removed in the peripheral area, then edge tail formation is prevented, but the sealing coverage is reduced
Solution Approach 1:
The patent merges organic and inorganic encapsulation layers in a stacked configuration. The inorganic insulating layer is formed over the organic insulating layers in the peripheral area, creating a composite encapsulation structure that combines the benefits of both material types for preventing edge tail formation while maintaining sealing.
Solution Approach 2:
The encapsulation structure uses a composite of organic and inorganic insulating layers. The organic layers provide sealing in the display area, while the inorganic layers provide edge tail prevention in the peripheral area. This composite approach allows simultaneous achievement of sealing coverage and edge tail prevention.
3Reliability
If multiple layers of organic insulating layers are stacked, then the sealing effectiveness is improved, but the device complexity increases
Solution Approach 1:
The stacked organic insulating layers serve multiple functions: providing sealing effectiveness, preventing moisture and oxygen penetration, and serving as a base structure for the inorganic encapsulation layer. This multi-functionality justifies the increased layer complexity by delivering multiple benefits from a single structural approach.
Data Source
AI summary
A display device includes a display part including a plurality of pixels arranged on a substrate, a plurality of dams in a first peripheral part adjacent to the display part, the plurality of dams being extended in a first direction of the first peripheral part and arranged in a second direction crossing the first direction, each of the plurality of dams including at least one selected from a first organic insulating layer and a second organic insulating layer, and a blocking part disposed between the plurality of dams and corresponding to a removed portion of the first and second organic insulating layers.