Segmented Sealing Film for OLED Water Resistance
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Solution Overview
Problem
Existing display devices face challenges in preventing water infiltration, which can lead to degradation of organic EL display devices due to defects in inorganic sealing films, and the use of organic films to mitigate these defects creates pathways for water ingress.
Innovation Solution
A sealing film structure comprising multiple inorganic films alternately stacked with organic films, where the organic films are divided into regions by partition walls to prevent water infiltration, ensuring that even if defects occur in the inorganic films, they do not propagate to the light-emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic film is used as a sealing film to prevent water infiltration, then water resistance is improved, but defects in the inorganic film create infiltration paths for water
Solution Approach 1:
The inorganic sealing film is divided into multiple layers (first inorganic film, second inorganic film, third inorganic film) with organic films and partition walls in between. This segmentation ensures that defects in one layer do not propagate through the entire sealing structure, as the partition walls interrupt continuous infiltration paths.
Solution Approach 2:
The sealing film uses a composite structure combining inorganic films (for water resistance) with organic films and partition walls (for defect interruption). This composite approach leverages the strengths of different materials while mitigating their individual weaknesses regarding water infiltration.
2Manufacturing precision
If an organic film is interposed between inorganic films to perform leveling, then surface uniformity is improved, but water infiltration paths are created through the organic film
Solution Approach 1:
The organic film is divided into multiple regions by partition walls, creating segmented zones that interrupt continuous water infiltration paths. This segmentation allows the organic film to perform leveling while the partition walls prevent it from becoming a continuous water pathway.
Solution Approach 2:
Partition walls are introduced as intermediary structures between the organic film and the inorganic films. These partition walls act as mediators that prevent water from using the organic film as an infiltration path while allowing the organic film to maintain its leveling function.
3Reliability
If multiple inorganic films are stacked to increase water resistance, then reliability is improved, but defects tend to propagate to upper layers
Solution Approach 1:
The stacked inorganic films are separated by organic films and partition walls that segment the structure. This segmentation prevents defects from propagating vertically through the stacked layers, as the partition walls create discontinuities in potential infiltration paths.
Data Source
AI summary
A display device is disclosed including a plurality of pixels arranged above a substrate, and a sealing film arranged above the substrate so as to cover the plurality of pixels, wherein the sealing film includes a stacked first inorganic film, second inorganic film and third inorganic film, a first organic film arranged between the first inorganic film and the second organic film, and a second organic film arranged between the second inorganic film and the third inorganic film, and wherein the first organic film is divided into a plurality of regions by a first partition wall, and the second organic film is divided into a plurality of regions by a second partition wall.