OLED Retaining Wall Grooves for Encapsulation Adhesion
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Solution Overview
Problem
OLED display panels face delamination issues during bending, leading to reduced product yield and service life due to inadequate encapsulation layer adhesion.
Innovation Solution
The introduction of grooves on the retaining wall with protrusions, allowing the encapsulating film to extend into these grooves, increasing contact area and enhancing adhesion between the encapsulating film and the retaining wall, which includes a sequence of inorganic and organic layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the encapsulation layer is made thin and flexible to enable bending, then flexibility and light weight are improved, but adhesion strength and reliability deteriorate, causing delamination during bending
Solution Approach 1:
The retaining wall is designed with a porous structure containing multiple grooves that extend from the top surface to the bottom surface. The encapsulation layer penetrates these grooves, creating a mechanical interlocking effect that significantly enhances adhesion strength while maintaining the overall flexibility of the encapsulation structure
Solution Approach 2:
The invention transitions from a flat, two-dimensional encapsulation layer to a three-dimensional structure by introducing vertical grooves in the retaining wall. The encapsulation layer extends into these grooves, creating a multi-dimensional attachment that improves adhesion without compromising flexibility
2Reliability
If the contact area between encapsulation film and retaining wall is increased to improve adhesion, then reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The retaining wall incorporates a porous structure with multiple grooves that can be formed using standard photolithography and etching processes. This approach increases the contact area between the encapsulation layer and retaining wall while maintaining compatibility with existing manufacturing techniques, avoiding excessive complexity
Solution Approach 2:
The retaining wall is segmented into multiple regions with grooves distributed throughout its structure. This segmentation creates multiple attachment points for the encapsulation layer, distributing stress and improving overall adhesion without requiring a uniformly complex structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the reliability of the OLED panel package, elongates the service life by increasing the contact area and stress absorption during bending, preventing encapsulating film breakage.
Implementation Method 1
increasing contact area and enhancing adhesion between the encapsulating film and the retaining wall
Data Source
AI summary
The present application provides a display panel and a display device, wherein the display panel includes: a substrate; a retaining wall disposed on the substrate; and an encapsulating film disposed on the retaining wall and covering the substrate, wherein a plurality of grooves are further disposed on a surface of the retaining wall facing the encapsulating film, and the encapsulating film extends into the grooves.