Organic Light-Emitting Display Islands Encapsulation
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Solution Overview
Problem
Conventional display apparatuses lack sufficient flexibility, leading to a significant reduction in their lifespan when repeatedly used, especially in wearable devices where bending is common.
Innovation Solution
An organic light-emitting display apparatus is designed with a flexible substrate, patterned organic encapsulating layers, and an inorganic covering layer, where the encapsulating layer is formed as islands to absorb stress and prevent cracking, enhancing durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus uses a flexible substrate to improve flexibility, then the flexibility is improved, but the lifespan decreases due to repeated bending
Solution Approach 1:
The encapsulating layer is divided into multiple isolated islands rather than a continuous layer. Each island corresponds to a pixel electrode and is separated from adjacent islands by gaps. This segmentation allows the encapsulating layer to flex without creating continuous stress paths that would lead to cracking, thereby maintaining both flexibility and lifespan.
Solution Approach 2:
The encapsulating layer has different structures in different regions: islands are positioned over pixel electrodes where flexibility is needed, while other regions may have different encapsulation characteristics. This local differentiation allows the structure to accommodate bending stresses at critical locations while maintaining protection where needed.
2Reliability
If the encapsulating layer is formed as islands to improve flexibility and prevent cracking, then the flexibility and durability are improved, but the manufacturing complexity increases
Solution Approach 1:
The pixel defining layer is formed first with patterns that guide the subsequent formation of the encapsulating layer islands. By pre-defining the regions where islands should be formed, the manufacturing process is simplified as the encapsulating layer can be deposited in a controlled manner following the established pattern, reducing the overall manufacturing complexity despite the island structure.
3Stability of the object's composition
If the first encapsulating layer is patterned to have islands corresponding to pixel electrodes, then the stress distribution is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The pixel defining layer serves multiple functions: it defines the pixel patterns, guides the formation of encapsulating layer islands, and provides a structural foundation. This multi-functionality reduces the need for separate precision patterning steps for the encapsulating layer, as it follows the already-established pixel pattern, thereby reducing manufacturing precision requirements.
Data Source
AI summary
An organic light-emitting display apparatus includes: a substrate; first electrodes arranged on the substrate at separate positions; a second electrode disposed on the first electrodes to face the first electrodes; an intermediate layer disposed between the first electrodes and the second electrode and including an emission layer; a first encapsulating layer disposed on the second electrode and patterned to have a plurality of islands, the first encapsulating layer including an organic material; and a second encapsulating layer covering the islands of the first encapsulating layer and including an inorganic material.