Display Blocking Groove Structure for Moisture Barrier Encapsulation
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Solution Overview
Problem
Display devices are vulnerable to moisture and oxygen infiltration, which can damage emission layers and oxidize signal lines, despite encapsulation efforts, as these substances can still penetrate through organic layers within the device.
Innovation Solution
A display device design featuring a substrate with a blocking region in the non-display area, an organic layer with a groove penetrating its entire thickness, and an auxiliary pattern overlapping the groove, combined with a thin film encapsulation layer that includes both inorganic and organic layers to prevent moisture and oxygen from entering the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display area is encapsulated by an encapsulation layer, then the penetration of moisture or oxygen is reduced and the life span is prolonged, but moisture or oxygen can still inflow through the organic layer
Solution Approach 1:
The encapsulation layer is segmented into multiple functional layers: a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. This multi-layer segmentation creates multiple barriers that moisture and oxygen must penetrate sequentially, significantly enhancing protection compared to a single-layer encapsulation.
Solution Approach 2:
The encapsulation structure uses composite materials combining inorganic and organic layers. The inorganic layers provide barrier properties against moisture and oxygen penetration, while the organic layer provides flexibility and adhesion. This composite structure leverages the complementary strengths of different material types to achieve superior encapsulation.
2Device complexity
If an organic layer is used in the display device, then the device structure is formed, but moisture or oxygen can penetrate through the organic layer
Solution Approach 1:
The organic layer is divided into two distinct interlayer insulating layers (first and second interlayer insulating layers) with different functions and properties. This segmentation allows each layer to be optimized for specific requirements while collectively providing enhanced barrier performance against moisture and oxygen penetration.
Solution Approach 2:
Different regions of the organic layer structure are assigned different qualities and thicknesses. The first interlayer insulating layer has different characteristics from the second interlayer insulating layer, with each region optimized to provide specific barrier properties where needed most effectively.
3Object-affected harmful factors
If a groove is created in the organic layer in the blocking region, then moisture and oxygen infiltration is prevented, but the device structure becomes more complex
Solution Approach 1:
The groove is pre-formed in the organic layer at the blocking region before final encapsulation is completed. This preliminary structural preparation creates a designated barrier zone that guides and enhances the encapsulation process, preventing moisture and oxygen infiltration paths before they can reach sensitive display areas.
Solution Approach 2:
The groove structure is localized specifically to the blocking region rather than being applied uniformly across the entire device. This localized modification concentrates the barrier enhancement where it is most needed while minimizing overall structural complexity and material usage.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area adjacent to the display area. The non-display area includes a blocking region. An organic layer is disposed on the substrate. An emission layer is disposed in the display area of the substrate. An auxiliary pattern is disposed in the blocking region of the non-display area of the substrate. A thin film encapsulation layer is disposed on the substrate and overlaps the emission layer and the blocking region. The organic layer has a groove penetrating an entire thickness of the organic layer in the blocking region. The auxiliary pattern overlaps the groove. The auxiliary pattern includes a same material as a gate electrode disposed in the display area of the substrate.