Island Dam Encapsulation for OLED Moisture Barrier
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Solution Overview
Problem
Organic light-emitting display devices are susceptible to performance degradation due to moisture and oxygen infiltration from the outside, which existing technologies have not effectively addressed.
Innovation Solution
The display device incorporates a substrate with a bending area, island dams, and a multilayer encapsulation structure including inorganic and organic layers to prevent moisture and oxygen ingress, with island dams extending parallel to voltage lines and overlapping connection units to control the flow of encapsulation materials and enhance sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple encapsulation structure is used, then the device complexity is reduced, but moisture and oxygen infiltration occurs causing performance degradation
Solution Approach 1:
The encapsulation structure is divided into multiple functional layers: inorganic encapsulation layers (first and second) for barrier protection, organic encapsulation layer for sealing, and island dams for structural support and material flow control. Each layer performs a specific function, collectively providing comprehensive protection against moisture and oxygen while maintaining manageable complexity through modular design.
Solution Approach 2:
The encapsulation structure combines inorganic materials (providing barrier properties against moisture and oxygen penetration) with organic materials (providing sealing and flexibility). This composite approach leverages the complementary advantages of different material types to achieve superior protection compared to single-material solutions.
2Manufacturing precision
If island dams are added to control encapsulation material flow, then sealing effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The island dams are formed in advance during the manufacturing process, before the encapsulation materials are applied. This preliminary structuring of the substrate with dams at predetermined locations allows for controlled material flow and precise encapsulation without requiring complex real-time manufacturing adjustments, thereby improving precision while keeping the manufacturing process manageable.
Data Source
AI summary
A display device includes a substrate including a display area, a peripheral area, and a pad area, first and second voltage lines, and an island dam. The first voltage line is disposed between a first side of the display area and the pad area, the second voltage line is disposed at other sides of the display area, and the island dam is disposed between the display area and the pad area. The first voltage line includes a first main voltage line, and a first connection unit that protrudes from the first main voltage line and extends toward the pad area. The second voltage line includes a second main voltage line, and a second connection unit that protrudes from an end of the second main voltage line and extends toward the pad area. The island dam extends substantially parallel to the first main voltage line.