Organic EL Display Sealing Wall Inclined Surface Moisture Barrier
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Solution Overview
Problem
Existing methods for sealing organic EL display devices fail to effectively prevent moisture intrusion from the sealing region into the organic EL layer, particularly at the edges.
Innovation Solution
The implementation of an organic EL display device design that includes a substrate with a display region and an external region surrounded by a separating wall with an inclined surface, where the organic layer covers the display region side of the separating wall, and inorganic films are used to seal the organic layer and the separating wall, ensuring comprehensive coverage and preventing moisture intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic material film and organic material layer are combined for sealing, then the organic EL layer is protected from moisture, but moisture can easily intrude into the organic EL layer from the end part of the sealing region
Solution Approach 1:
The patent combines inorganic material films and organic material layers to create a composite sealing structure. The inorganic film provides barrier properties against moisture, while the organic layer provides flexibility and conformal coverage. This composite approach addresses the contradiction by leveraging the complementary strengths of different materials to achieve both protection and edge sealing effectiveness.
Solution Approach 2:
The patent introduces a third dimension by forming an inclined surface on the separating wall that slopes toward the display region. This dimensional change creates a geometric barrier that prevents moisture from reaching the organic EL layer at the sealing edges, effectively solving the edge intrusion problem while maintaining the protective sealing function.
2Reliability
If a separating wall is formed at the external region to contain the organic layer, then moisture intrusion is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the sealing function into distinct segments: a separating wall structure and an organic layer. The separating wall is formed first to define the containment region, and then the organic layer is deposited to complete the sealing. This segmentation simplifies the manufacturing process by breaking down the complex sealing requirement into manageable, sequential steps.
Solution Approach 2:
The separating wall is formed in advance before the organic layer is deposited. This preliminary action establishes the containment geometry and defines the sealing region, making subsequent processing easier and more reliable. The inclined surface is also formed preliminarily to pre-establish the moisture barrier geometry.
3Reliability
If the organic layer is formed to cover the display region side of the separating wall, then comprehensive moisture protection is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes the geometric parameters of the separating wall by introducing an inclined surface with a specific slope. This parameter change creates a self-aligning feature that guides the organic layer deposition process, reducing the precision requirements for layer formation while ensuring comprehensive coverage and moisture protection.
Data Source
AI summary
An organic EL display device according to an embodiment of the present invention includes a substrate on which a display region including a plurality of pixels including an organic EL layer and an external region that surrounds the display region are formed, at least one separating wall that is formed at a part of the external region on the substrate, and an organic layer that covers at least a part of the display region, includes an organic material, and is formed on a display region side of the at least one separating wall. A wall surface of the display region side of the at least one separating wall includes an inclined surface that is inclined toward the display region side as it is extended away from the substrate.