Folded Support Structure for Flexible Display Edge Peeling
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Solution Overview
Problem
Existing flexible display apparatuses face issues such as deformation, crack opening, and peeling of the flexible printed circuit at the edge portions during bending, leading to structural instability and poor adhesion of components.
Innovation Solution
A display apparatus with a stacked structure comprising a main support layer, an auxiliary support layer with a folded-back portion, and a flexible printed circuit, where the layers are curved towards the back side and lack a back film at the bending portion, ensuring a secure attachment and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a back film is added to cover the bending portion, then the structural integrity is improved, but the adhesion strength and resistance to peeling deteriorate
Solution Approach 1:
The patent removes the back film from the bending portion to eliminate the peeling defect. By extracting the problematic component (back film) from the critical bending area, the invention resolves the adhesion issue while maintaining structural integrity through the stacked structure of the auxiliary support layer and main support layer.
Solution Approach 2:
The patent segments the support structure into multiple functional layers: the auxiliary support layer with folded-back portion for edge support, the main support layer for overall structural integrity, and selective application of back film only in non-bending areas. This segmentation allows each layer to perform its specific function without interfering with the bending performance.
2Strength
If the stacked structure is curved towards the back side, then the adhesion strength is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies adhesive to the auxiliary support layer and main support layer before assembling the stacked structure, and pre-forms the folded-back portion of the auxiliary support layer. These preliminary actions ensure proper adhesion and structural configuration before final assembly, reducing manufacturing complexity during the bonding process.
Solution Approach 2:
The patent uses flexible thin film materials for the auxiliary support layer and main support layer that can be easily curved towards the back side without breaking. The flexibility of these thin films allows the curved configuration to be achieved through simple lamination processes rather than complex forming operations.
3Strength
If the folded-back portion is positioned closer to the bending portion, then the resistance to deformation is improved, but the risk of crack opening increases
Solution Approach 1:
The patent positions the folded-back portion of the auxiliary support layer at a specific distance from the bending portion, creating a gradient of support: closer to the bending portion to provide deformation resistance, but not so close as to cause stress concentration and cracking. This local optimization of the folded-back portion's position resolves the contradiction between deformation resistance and crack prevention.
Data Source
AI summary
A display apparatus includes a display panel having a display portion, a connecting portion, and a bending portion, wherein the bending portion connects the display portion and the connecting portion, the bending portion is bent; a main support layer; an auxiliary support layer including a main portion and a folded-back portion connected to the main portion as a unitary structure; and a flexible printed circuit bonded to the connecting portion. An edge portion of the display apparatus includes a stacked structure. The stacked structure includes the connecting portion; the folded-back portion on the connecting portion; at least a part of the main portion on a side of the folded-back portion away from the connecting portion; a part of the main support layer; and a part of the display portion on a side of the part of the main support layer away from the main portion.