Flexible Display Panel Groove Encapsulation Stress Reduction
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Solution Overview
Problem
Flexible display panels face significant bending stress issues due to their thickness, leading to cracks or breakage when bent, and existing solutions either fail to effectively reduce stress or compromise the encapsulation of the thin-film-encapsulation layer.
Innovation Solution
A flexible display panel design featuring a thin-film-encapsulation layer with at least one organic and one inorganic encapsulation layer, where a groove is formed on the opposing side of the organic encapsulation layer in bending areas, with a bottom width configured as W≥n180°πR, reducing panel thickness and distributing bending stress, while maintaining effective encapsulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flexible display panel is made thicker to maintain structural integrity, then strength is improved, but bending stress increases causing cracks or breakage
Solution Approach 1:
The encapsulation layer is segmented into multiple sub-layers (first encapsulation sub-layer and second encapsulation sub-layer), with the second sub-layer being discontinuous in the bending area. This segmentation allows the structure to maintain integrity while accommodating bending stress through strategic gaps.
Solution Approach 2:
The encapsulation structure has different properties in different areas: the first encapsulation sub-layer provides continuous protection across the entire panel, while the second encapsulation sub-layer is discontinuous specifically in the bending area. This local differentiation optimizes both protection and stress management.
2Stress or pressure
If the thickness of the encapsulation layer is reduced to decrease bending stress, then bending stress is reduced, but encapsulation effectiveness deteriorates
Solution Approach 1:
The encapsulation layer is divided into functional segments: a first sub-layer that provides continuous baseline protection, and a second sub-layer that is strategically discontinuous in bending areas. This segmentation enables stress reduction while maintaining encapsulation through the complementary first sub-layer.
Solution Approach 2:
The encapsulation structure uses a composite of organic and inorganic materials in multiple sub-layers, combining the advantages of different material properties to achieve both stress flexibility and protective effectiveness.
Data Source
AI summary
A flexible display panel and a flexible display apparatus are provided. The flexible display panel comprises a flexible substrate, an organic light-emitting layer disposed on a side of the flexible substrate and having a first side facing the flexible substrate and an opposing side, and a thin-film-encapsulation layer disposed on the opposing side of the organic light-emitting layer and including at least one organic encapsulation layer and at least one inorganic encapsulation layer. The flexible display panel includes at least one bending area. The at least one organic encapsulation layer has a first side facing the flexible substrate and an opposing side. In the at least one bending area, at least one groove is formed on the opposing side of the at least one organic encapsulation layer. A bottom width W of the at least one groove is configured to beW≥n180°πR.