Display Panel Common-Layer Segmentation for Narrow OLED Frames
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Solution Overview
Problem
Current OLED full-screen concept products face limitations in narrowing the frame due to packaging technology, with the common layer in the light-emitting layer being susceptible to water and oxygen infiltration, necessitating a wider encapsulation layer.
Innovation Solution
A display panel design featuring a groove with a first undercut structure that disconnects the common layer, allowing the encapsulation layer to cover only the light-emitting area, thereby cutting off the propagation path of water and oxygen, and reducing the encapsulation layer width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer covers the entire common layer including the peripheral area, then water and oxygen infiltration is prevented, but the frame width increases
Solution Approach 1:
The common layer is segmented into a first portion in the light-emitting area and a second portion in the peripheral area, disconnected by the first undercut structure. The encapsulation layer is designed to cover only the first portion, separating the protection function from the structural support function of the common layer.
Solution Approach 2:
The encapsulation layer is applied locally only where needed (over the first portion of the common layer in the light-emitting area) rather than uniformly across the entire common layer. This localized application reduces the overall width of the encapsulation layer while maintaining protection where required.
2Length of stationary object
If the common layer is disconnected by the first undercut structure, then the encapsulation layer width is reduced, but water and oxygen propagation path is altered
Solution Approach 1:
The common layer is divided into disconnected first and second portions by the first undercut structure. This segmentation allows the encapsulation layer to be reduced in width while the second portion still provides protection in the peripheral area through alternative means.
Solution Approach 2:
The groove with its sidewall acts as an intermediary structure between the first and second portions of the common layer. The groove geometry and the second portion of the common layer work together to maintain the water and oxygen barrier function despite the disconnection.
3Length of stationary object
If the groove penetrates the inorganic insulating layer and substrate, then the common layer can be disconnected for narrow frame, but structural integrity is compromised
Solution Approach 1:
The substrate uses a flexible base that can accommodate the groove structure while maintaining overall integrity. The flexible nature of the substrate allows it to span the groove without compromising structural strength, enabling the narrow frame design.
Solution Approach 2:
The groove is positioned and oriented in a specific dimension within the substrate structure, allowing the substrate to maintain integrity by distributing stresses around the groove rather than creating weak points that compromise overall strength.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate including a first flexible base, an inorganic insulating layer, a driving circuit layer, a light emitting layer including a common layer, and an encapsulation layer including at least one inorganic layer. A first undercut structure is defined on a peripheral area of the display panel, and the common layer includes a first portion and a second portion disconnected by the first undercut structure. At least one inorganic layer covers the first portion and does not exceed an end of the common layer away from a light emitting area.