Organic Light Emitting Display Barrier Rib Sealant Flow Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing organic light emitting displays face a reliability and emission efficiency issue due to the sealant flowing into the emission region caused by capillary phenomena when the substrate and encapsulation substrate are attached, damaging the emission layer and reducing performance.
Innovation Solution
The organic light emitting device features barrier ribs on the substrate with varying volume per unit area between the emission and non-emission regions, where the barrier ribs on the non-emission region have a narrower width and specific taper shapes to prevent sealant flow into the emission region, and an additional barrier can be used to further prevent sealant ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If barrier ribs with uniform width are used across the substrate, then the structure is simple and easy to manufacture, but sealant flows into the emission region due to capillary phenomenon
Solution Approach 1:
The barrier rib is designed with different widths in different regions: a first width in the non-emission region and a second width in the emission region. This local variation in geometry prevents sealant from flowing into the emission region while maintaining manufacturing simplicity, resolving the contradiction between ease of manufacture and reliability.
2Reliability
If the barrier rib width is increased to prevent sealant flow, then sealant containment is improved, but the device complexity increases
Solution Approach 1:
The barrier rib is segmented into two distinct sections with different widths: a first section in the non-emission region and a second section in the emission region. This segmentation allows the structure to prevent sealant flow effectively while maintaining relative simplicity, avoiding excessive device complexity.
3Reliability
If additional barrier structures are added to prevent sealant ingress, then sealant containment is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Rather than adding multiple barrier structures across the entire substrate, the invention applies a localized width variation only where needed (at the boundary between emission and non-emission regions). This approach improves sealant containment while minimizing impact on manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces the capillary phenomenon, preventing sealant flow into the emission region and enhancing the reliability and emission efficiency of the organic light emitting display by creating a secure space and using additional barriers to prevent sealant ingress.
Implementation Method 1
a capillary phenomenon created by a pressure applied when the substrate 110 and the encapsulation substrate 170 are attached to each other causes the sealant 160 to flow into the emission region E
Data Source
AI summary
An organic light emitting device is provided. The device may include a substrate having an emission region and a non-emission region, a sub-pixel formed on the substrate in the emission region of the substrate, and a sealant provided in the non-emission region that seals the emission region of the substrate. The sub-pixel may include a first electrode formed on the substrate in the emission region of the substrate, an emission portion formed on the first electrode, and a second electrode arranged on the emission portion. A barrier rib may be provided to partition the second electrode. A width of an end portion of the barrier rib may be narrower than a width of another portion of the barrier rib.