Foldable Display Supporting Plate for Transition-Region Film Peeling
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Solution Overview
Problem
Current foldable display modules experience film peeling issues in the transition region where the non-bending region transitions to the bending region due to mismatched elastic moduli between the stainless steel support layer and film layers, leading to poor foldability and high production defects.
Innovation Solution
A supporting plate with strategically designed hollow and groove structures on its surface, including symmetrically arranged hollow structures and semi-etching regions, to manage regional elastic tensile modulus variations, reducing curvature differences and stress concentrations, thereby enhancing bending ductility and fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thin stainless steel plate is used as the support layer to ensure overall flatness, then the structural strength and flatness are improved, but the elastic modulus mismatch with film layers causes uncoordinated deformation during folding, leading to film peeling and fracture
Solution Approach 1:
The patent divides the support plate into distinct functional zones: bending regions with hollow patterns that allow deformation, and non-bending regions that maintain structural strength. This segmentation enables different parts of the support plate to have different mechanical properties, resolving the contradiction between overall strength and localized flexibility needed to prevent film peeling during folding operations
Solution Approach 2:
The support plate implements local quality by providing different structural characteristics in different regions: the bending regions have hollow patterns reducing elastic modulus to match film layers during folding, while non-bending regions maintain solid structure for strength. This local differentiation allows the support plate to simultaneously provide structural integrity and accommodate folding deformation without causing film layer separation
2Ease of operation
If hollow patterns are added to bending regions of the SUS plate to reduce bending rigidity and improve foldability, then the foldability is improved, but film peeling still occurs in the transition region where non-bending region transits toward bending region
Solution Approach 1:
The patent applies dynamics by designing the support plate to have different rigidity characteristics in different regions: bending regions with hollow patterns that dynamically deform during folding, and non-bending regions that remain rigid. The transition region between these zones creates a gradual rigidity gradient, allowing smooth deformation propagation and preventing sudden stress concentrations that cause film peeling in transition areas
Solution Approach 2:
The patent addresses the transition region problem by extending the hollow pattern design into the transition zone, creating a gradual transition from solid to hollow structures. This dimensional extension of the hollow pattern concept into the transition region ensures continuous rigidity variation, preventing the abrupt property changes that cause film peeling at the boundaries between bending and non-bending regions
Data Source
AI summary
A supporting plate and a foldable display module are provided. The supporting plate has a bending region and non-bending regions. The bending region includes joint regions and semi-etching regions. A plurality of hollow structures are defined on a part of the supporting plate corresponding to the joint regions. A plurality of groove structures are defined on a part of the supporting plate corresponding to the semi-etching regions. In this way, stress received by a part of the flexible display panel corresponding to the semi-etching regions is reduced, and a risk of films peeling in the semi-etching regions of the foldable display module is reduced.