OLED Array Substrate Recesses for Gas Discharge
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Solution Overview
Problem
Organic Light-Emitting Diode (OLED) display devices face issues with moisture and oxygen absorption by the pixel defining layer and support layer, leading to erosion of the organic light-emitting material and reduction in light-emitting area over time.
Innovation Solution
The array substrate incorporates a pixel defining layer with recesses that provide a discharge path for moisture and oxygen during high-temperature processing, and a support layer with additional recesses to enhance the removal of these gases, preventing pixel shrinkage and maintaining the light-emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel defining layer and support layer are made dense to prevent moisture and oxygen absorption, then the protection against environmental degradation is improved, but the ability to release trapped gases during high-temperature processing is worsened
Solution Approach 1:
The pixel defining layer and support layer are segmented by introducing recesses that create discrete gas discharge channels. These recesses divide the continuous layer structure into sections with controlled void spaces, allowing gas to escape through specific pathways while maintaining the overall integrity and protective function of the layers.
Solution Approach 2:
The pixel defining layer and support layer are designed with a porous structure featuring recesses of specific depths (first recess in pixel defining layer, second recess in support layer). This porous configuration enables the layers to both protect against environmental degradation and facilitate the release of trapped gases during high-temperature processing by providing controlled void spaces and discharge pathways.
2Strength
If the pixel defining layer is made thicker to improve structural support, then the mechanical strength is improved, but the light-emitting area is reduced
Solution Approach 1:
Instead of increasing the lateral thickness of the pixel defining layer uniformly, the invention introduces vertical recesses at specific locations. This dimensional approach allows the layer to maintain adequate structural support while creating localized regions that facilitate gas discharge, thereby preserving the light-emitting area without compromising mechanical strength.
3Reliability
If high-temperature processing is applied to remove moisture and oxygen, then the initial quality of the OLED is improved, but gas trapped in the layers causes pixel shrinkage during operation
Solution Approach 1:
The recesses are pre-formed in the pixel defining layer and support layer before the high-temperature processing step. This preliminary action creates ready-made discharge pathways that allow gases trapped during manufacturing to escape during subsequent high-temperature processing, preventing pixel shrinkage and maintaining stable pixel dimensions throughout the OLED's operational life.
Data Source
AI summary
The present disclosure relates to an array substrate, a display panel, and a display device. In an embodiment, an array substrate is provided that comprises: a substrate; and a pixel defining layer disposed on the substrate, the pixel defining layer including a plurality of openings and a partition portion for separating the plurality of openings from each other, wherein the partition portion has a first recess.