OLED Encapsulation Rib Aperture Moisture Barrier
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices are prone to degradation due to moisture sensitivity, leading to decreased luminance and display quality issues.
Innovation Solution
The implementation of a configuration that includes a rib with apertures, partitions, and inorganic layers to create a barrier that suppresses moisture ingress, with the first inorganic layer positioned between the organic layer's end portion and the partition, and the second inorganic layer covering the partition and second electrode, enhancing adherence and moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the organic layer is used as a display element, then light emission and display functionality are achieved, but moisture resistance is insufficient leading to degradation
Solution Approach 1:
The encapsulation structure is divided into multiple inorganic layers (first inorganic layer, second inorganic layer) with an organic layer in between, creating a segmented barrier system that provides superior moisture protection compared to a single layer structure
Solution Approach 2:
The patent uses a composite structure combining organic and inorganic materials in alternating layers, where the inorganic layers provide moisture barrier functionality while the organic layer provides flexibility and adhesion, creating a synergistic encapsulation system
2Reliability
If multiple inorganic layers are added to improve moisture barrier, then moisture protection is enhanced, but device structure becomes more complex
Solution Approach 1:
The inorganic layers serve multiple functions simultaneously: they act as moisture barriers, provide structural support, and enable planarization of surface irregularities, reducing the need for additional dedicated components
Solution Approach 2:
The patent addresses surface irregularities and moisture ingress paths by adding encapsulation layers in the vertical dimension rather than trying to solve problems in the planar dimension, effectively blocking moisture paths through increased layer thickness and improved coverage
Data Source
AI summary
According to one embodiment, a display device comprises a rib including an aperture and an upper surface, a partition on the upper surface, a first electrode overlapping the aperture, an organic layer including a first end portion on the upper surface and covering the first electrode, a second electrode including a second end portion on the upper surface and covering the organic layer, a first inorganic layer on the rib, and a second inorganic layer covering the partition, the second electrode, and the first inorganic layer. At least a part of the first inorganic layer is located between the first end portion and the partition and is in contact with the second inorganic layer.