OLED Retaining Wall Grooves Prevent Encapsulation Peeling
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Solution Overview
Problem
Conventional OLED display panels experience film peeling issues due to the material difference between the retaining walls and the inorganic encapsulating layer, leading to failure of the OLED device.
Innovation Solution
Incorporating retaining walls with grooves or protrusions on their top surfaces in the buffer area, increasing the contact area with the encapsulation layer, which is larger than the orthographically projected area, to prevent film peeling by enhancing the bonding between the retaining walls and the encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If retaining walls are made of organic material to prevent inkjet printing overflow, then the boundary control during leveling is improved, but film peeling occurs due to material difference from the inorganic encapsulating layer
Solution Approach 1:
The patent introduces a buffer area between the display area and hole-digging area, creating a spatial transition zone. The retaining wall is positioned in this buffer area rather than directly at the OLED boundary, adding a dimensional buffer that allows the encapsulation layer to bridge between the organic retaining wall and the substrate without direct contact, thus preventing peeling while maintaining boundary control.
Solution Approach 2:
The encapsulation layer serves as an intermediary element that connects the organic retaining wall and the inorganic encapsulating layer. By designing the encapsulation layer to extend over the retaining wall and make contact with both materials, it acts as a mediator that prevents direct interaction between incompatible materials, thereby eliminating the peeling problem while maintaining the retaining wall's boundary control function.
2Strength
If the contact area between retaining wall and encapsulation layer is increased, then bonding strength is improved, but the structural complexity increases
Solution Approach 1:
The patent segments the contact interface between the retaining wall and encapsulation layer by creating multiple contact points through grooves or protrusions on the retaining wall surface. This segmentation increases the total contact area and bonding strength while maintaining a relatively simple overall structure, as the complexity is localized to the surface features rather than the entire device architecture.
Data Source
AI summary
The present application provides a display panel and a display device. The display panel includes a display area, a hole-digging area, and a buffer area between the display area and the hole-digging area, wherein one or more retaining walls on the pixel defining layer in the buffer area, a top surface of the retaining wall is provided with a groove or a protrusion; the encapsulating layer is disposed on the light-emitting functional layer and the retaining wall, such that a contact area between a top surface of the retaining wall and the encapsulation layer is increased, thus avoiding the problem of film peeling between the retaining wall and the encapsulating layer.