OLED Encapsulation Structure for Camera Holes
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Solution Overview
Problem
The challenge in OLED display panels is the exposure of organic materials during hole punching, leading to moisture and oxygen diffusion, which causes the Growing Black Spots (GDS) phenomenon, affecting yield and quality.
Innovation Solution
A method involving the formation of an intermediate layer with an isolation hole and assembly via on a substrate, followed by creating a groove on the isolation portion to separate the light emitting layers, ensuring the encapsulation layer covers and fills the groove, preventing moisture and oxygen entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a hole is punched in the light emitting area to mount camera or sensor, then the screen-to-body ratio is improved and full screen effect is achieved, but the organic light emitting materials are exposed to air, causing moisture and oxygen diffusion that leads to Growing Black Spots (GDS)
Solution Approach 1:
The light emitting layer is divided into multiple separate light emitting portions (first, second, third, and fourth light emitting portions) that are spatially separated. The isolation portion contains the light emitting layer that is disconnected from other light emitting portions, creating physical separation that prevents continuous moisture and oxygen diffusion paths while maintaining the punched hole structure for camera or sensor mounting.
Solution Approach 2:
The isolation portion acts as an intermediary structure between different light emitting portions. It contains a disconnected light emitting layer that serves as a barrier to moisture and oxygen diffusion while allowing the punched hole to pass through. This intermediary structure blocks the harmful diffusion path without compromising the full screen effect achieved by the punched hole.
2Illumination intensity
If the light emitting layer is made continuous to ensure uniform emission, then the display quality is improved, but moisture and oxygen can diffuse continuously through the organic materials causing GDS phenomenon
Solution Approach 1:
The light emitting layer is segmented into multiple discrete portions rather than being continuous. The isolation portion contains a light emitting layer that is intentionally disconnected from other light emitting portions, creating gaps that block moisture and oxygen diffusion while maintaining sufficient light emitting areas for display quality.
Solution Approach 2:
Different regions of the light emitting layer have different connectivity characteristics. The first, second, and fourth light emitting portions are connected to their respective electrodes, while the third light emitting portion in the isolation region is disconnected. This local variation in connectivity provides both display functionality and protection against moisture and oxygen diffusion.
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 approach prevents the GDS phenomenon, enhancing the yield and quality of the display panel by blocking moisture and oxygen, thus extending the service life.
Implementation Method 1
etching a side on the inorganic layer of the isolation portion facing the display portion and/or a side on the inorganic layer of the isolation portion away from the display portion by using an inorganic etching solution to form the groove
Implementation Method 2
forming an encapsulation layer, the encapsulation layer covering the light emitting layer and the isolation portion, and being filled in a groove
Data Source
AI summary
A method for encapsulating openings in a display area includes: forming an intermediate layer having an isolation hole and an assembly via on a substrate, the isolation hole dividing the intermediate layer into separate display portion and isolation portion and the assembly via being spaced apart from the isolation hole by the isolation portion; forming a groove on a side of the isolation portion facing the display portion and/or on a side of the isolation portion away from the display portion; forming a light emitting layer including a first light emitting portion, a second light emitting portion, a third light emitting portion, and a fourth light emitting portion, wherein the third light emitting portion is separate from at least one of the second light emitting portion and the fourth light emitting portion; and forming an encapsulation layer that covers the light emitting layer and the isolation portion, and is filled in a groove.