Flexible Display Sawtooth Edge Encapsulation
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Solution Overview
Problem
Flexible active-matrix organic light emitting diode display devices suffer from poor moisture and oxygen blocking performance due to the brittleness of inorganic encapsulation films, which can lead to edge fractures or peeling when bent, compromising reliability.
Innovation Solution
A flexible display device with a concave-convex sawtooth structure at the edge of the encapsulating film layer, combined with a moisture and oxygen blocking layer, disperses bending stress and enhances blocking capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin film encapsulation process is adopted to enhance moisture and oxygen blocking performance, then the moisture and oxygen blocking effect is improved, but the edge of the encapsulation film is prone to fracture or peeling when bent due to brittleness of inorganic material
Solution Approach 1:
The encapsulation film edge is segmented into multiple layers (first encapsulation film layer and second encapsulation film layer) with different material compositions. The first layer uses inorganic material for blocking performance, while the second layer uses organic material for flexibility and fracture resistance, creating a composite structure that divides functionality between layers.
Solution Approach 2:
The encapsulation film employs a composite structure combining inorganic and organic materials in different layers. The inorganic layer provides moisture and oxygen blocking, while the organic layer provides flexibility and prevents edge fracture, achieving both blocking performance and mechanical strength through material composition.
2Reliability
If an inorganic material is used in encapsulation film to improve moisture and oxygen blocking, then the blocking effect is enhanced, but the film becomes brittle and prone to edge fracture when bent
Solution Approach 1:
The encapsulation film is segmented into functional layers: the first encapsulation film layer (inorganic) handles blocking, while the second encapsulation film layer (organic) handles flexibility. This segmentation allows each layer to specialize in one function without compromising the other.
Solution Approach 2:
Different regions of the encapsulation film have different material properties tailored to local requirements. The first layer has high blocking quality, while the second layer has high flexibility quality, with each layer's material composition optimized for its specific function in the overall structure.
Data Source
AI summary
A flexible display device and a method for manufacturing the flexible display device are provided by embodiments of the present application, which solve problems that a module of a flexible active-matrix organic light emitting diode has a poor moisture and oxygen blocking effect on a side, and an edge is prone to fracture or be peeled off when bent. A flexible display device provided by an embodiment of the application includes a display substrate, and an encapsulating film layer disposed on a surface of the display substrate. An edge of the encapsulating film layer includes a concave-convex sawtooth structure.