OLED Display Bank Structure for Impurity Protection
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Solution Overview
Problem
Organic light-emitting display apparatuses are prone to image quality deterioration due to impurities such as gas or moisture penetrating from outside or generated within the display, which can affect the performance of the OLED during manufacturing or usage.
Innovation Solution
The apparatus features a substrate with a display area and a periphery area, where a first insulating layer with specific openings separates the first and second banks, preventing impurities from entering the display area. This configuration includes a conductive layer and a capping layer, with the first and second banks formed from organic materials, and an encapsulation layer with inorganic materials to enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the OLED structure is simplified for easier manufacture, then manufacturing precision may be maintained, but the device becomes more susceptible to impurity penetration from outside
Solution Approach 1:
The device is divided into distinct functional regions: a display area containing the OLED and a periphery area containing organic banks. This segmentation allows the periphery area to serve as a protective barrier that isolates the display area from external impurities while maintaining manufacturing simplicity.
Solution Approach 2:
An opening is introduced as an intermediary feature in the insulating layer, positioned between the display area and periphery area. This opening allows controlled interaction between regions while the surrounding organic banks act as mediators to prevent impurity ingress into the display area.
2Adaptability or versatility
If organic materials are used for banks to improve flexibility, then adaptability is enhanced, but the risk of impurity generation within the organic material increases
Solution Approach 1:
The potentially harmful organic bank material is extracted and removed from the display area, placing it exclusively in the periphery area. This extraction ensures that even if impurities are generated in the organic banks, they cannot contaminate the OLED in the display area.
Solution Approach 2:
The periphery area containing organic banks is positioned to convert the potential harm of impurity generation into a benefit: the organic banks serve as a sacrificial barrier that can contain and isolate any generated impurities away from the display area, protecting the OLED while maintaining the advantages of organic materials.
3Manufacturing precision
If the first opening is placed closer to the display area to improve manufacturing alignment, then manufacturing precision is improved, but the protection against impurity penetration is reduced
Solution Approach 1:
The insulating layer is designed with different properties in different regions: in the periphery area, it contains the opening for alignment purposes, while in the display area, it provides continuous protection. The organic banks are strategically positioned to provide enhanced protection specifically around the opening region, creating local quality variations that address both alignment and protection needs.
Data Source
AI summary
An organic light-emitting display apparatus prevents the quality of an image being displayed thereon from being deteriorated as a result of contamination of an organic emission layer. The display apparatus includes a substrate with a display area and a periphery area. A first insulating layer, disposed over the substrate, has a first opening in the periphery area. A first electrode is disposed within the display area, over the first insulating layer. A first bank is disposed over the first insulating layer and has a second opening through which a center of the first electrode is exposed. A second bank is disposed over the first insulating layer and is separated from the first bank. The first opening is disposed between the first bank and the second bank. An intermediate layer is disposed over the first electrode. A second electrode is disposed over the intermediate layer and the first bank.