Organic Light-Emitting Display Moisture Barrier Design
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Solution Overview
Problem
Organic light-emitting display apparatuses face limitations in display area due to the encapsulation layer, which also fails to effectively protect against external moisture.
Innovation Solution
A display apparatus design featuring a substrate with a display unit and a dam unit, an insulating unit, and metal layers, where the insulating unit has openings filled with an organic material layer that contacts the inner side surfaces, providing a maximum display area while being resistant to moisture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation layer is provided above the organic light-emitting device to protect against moisture, then moisture resistance is improved, but the display area is reduced due to dead space
Solution Approach 1:
The encapsulation structure transitions from a planar layer above the display to a three-dimensional dam structure with vertical walls extending downward into grooves. This vertical dimension allows the encapsulation to provide moisture protection while minimizing horizontal space occupation, thereby preserving display area.
Solution Approach 2:
The dam structure is nested within grooves formed in the substrate, creating a recessed enclosure. The encapsulation layers are positioned within these grooves, allowing the protective structure to be embedded rather than adding external bulk, thus maintaining maximum display area while ensuring moisture protection.
2Reliability
If the encapsulation layer is extended to cover the entire substrate area to ensure complete moisture protection, then moisture resistance is improved, but the device complexity increases
Solution Approach 1:
The encapsulation structure is divided into distinct functional segments: grooves formed in the substrate, dams rising from the groove bottoms, and encapsulation layers filling the groove spaces. This segmentation allows each component to be optimized independently and simplifies the manufacturing process compared to a monolithic encapsulation layer.
Solution Approach 2:
The encapsulation structure applies protection locally where moisture ingress is most critical - at the edges and perimeters of the substrate where grooves and dams are formed. The interior display area remains uncovered, eliminating unnecessary material and reducing structural complexity while maintaining effective moisture protection.
Data Source
AI summary
A display apparatus may include a substrate, a display unit, a first dam unit, an insulating unit, and a first metal layer. The display unit may overlap the substrate. The first dam unit may at least partially surround the display unit. A first trench may be positioned between the first dam unit and the display unit. The insulating unit may be disposed between the substrate and the first dam unit, may have an insulating portion, and may have a first opening set. The first opening set may be disposed between the insulating portion and the display unit. The insulating portion may at least partially surround the display unit. The first metal layer may have a second opening set positioned over the first opening set.