OLED Anode Holes Expose Dam to Prevent Peeling
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Solution Overview
Problem
OLED devices are prone to peeling issues at the interface between the anode and other interlayers due to the stress and density changes in the film layers at the dam step portions, especially under high temperature and high humidity conditions, leading to potential damage and reduced reliability.
Innovation Solution
The introduction of a display panel design with a plurality of holes on the anode that expose the dam, allowing the first inorganic packaging layer of the thin-film packaging layer to contact the first and second inorganic layers of the dam, thereby increasing adhesive strength and preventing peeling risks, especially at slope regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the anode is formed on the entire surface including the dam region to provide continuous coverage, then the anode coverage is improved, but the adhesive strength at the step portions deteriorates causing peeling
Solution Approach 1:
The anode is segmented by forming holes at the dam step portions, separating the continuous anode into regions that are isolated at critical stress points. This segmentation prevents peeling from propagating across the entire interface while maintaining adequate coverage in stable regions.
Solution Approach 2:
The anode structure is modified locally at the dam step portions by creating holes specifically at these high-stress regions. This local modification reduces stress concentration and prevents peeling initiation at the most vulnerable locations while preserving the continuous anode structure in other areas.
2Reliability
If multiple dams are increased to limit organic layer flow, then the organic layer confinement is improved, but the number of step portions increases causing higher peeling risk
Solution Approach 1:
The solution segments the problematic step portions by introducing holes that isolate each dam structure. This allows multiple dams to be used for effective organic layer confinement while preventing the cumulative peeling risk by separating the stress fields of adjacent dams.
Solution Approach 2:
The holes act as intermediaries that decouple the stress fields between multiple dams. By introducing these void spaces, the peeling forces from one dam do not directly affect adjacent dams, allowing the system to tolerate multiple dams without proportionally increasing overall peeling risk.
3Manufacturing precision
If the anode is deposited as a continuous film to ensure complete coverage, then the coverage uniformity is improved, but the stress concentration at step portions increases leading to peeling
Solution Approach 1:
The anode structure is made non-uniform locally by introducing holes specifically at the dam step portions. This local modification maintains good coverage uniformity across the majority of the surface while creating stress-relief zones at the critical step locations where peeling is most likely to occur.
Solution Approach 2:
The continuous anode film is segmented by forming holes at step portions, breaking the continuous stress path. This segmentation maintains overall coverage uniformity while preventing stress concentration from propagating through the entire anode-dam interface.
Data Source
AI summary
A display panel disclosed in the application includes a display region and a peripheral region. The display panel includes a substrate and at least one dam disposed on the substrate. The dam is in the peripheral region. An anode is disposed on the substrate and is in the peripheral region. A plurality of holes is provided on the anode to expose the dam. In a direction which the display region faces the peripheral region, a size of the holes is greater than a size of the dam.