Foldable Display Assembly With Neutral-Plane Control
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Solution Overview
Problem
Folding display devices often result in curved sections that degrade display quality due to the inability to maintain a flat configuration under external forces.
Innovation Solution
A foldable display device assembly comprising a rigid film, double-sided adhesive films, and flexible modules, where the rigid film is foldable about a folding axis, and the adhesive films are strategically positioned to maintain a neutral plane within the flexible display module, minimizing deformation and maintaining flat non-folding regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display device is made foldable to provide a large screen when in use, then the display area is increased, but the display quality degrades due to curved sections formed during folding
Solution Approach 1:
The display device is divided into multiple sections: a first rigid section, a flexible section, and a second rigid section. This segmentation allows the flexible section to accommodate folding while the rigid sections maintain flat configurations to ensure display quality in non-folding regions.
Solution Approach 2:
Different sections of the display device have different structural properties. The rigid sections are designed to maintain flatness for high-quality display, while the flexible section is specifically designed to be bendable. This local differentiation of structural quality allows the device to achieve both large display area and maintained display quality in non-folding regions.
2Adaptability or versatility
If the display device is made flexible to enable folding, then the adaptability is improved, but the structural stability deteriorates when external forces are applied
Solution Approach 1:
The display device is divided into rigid and flexible sections, allowing the rigid sections to provide structural stability while the flexible section enables folding adaptability. This segmentation resolves the contradiction by assigning different functional roles to different parts of the structure.
Solution Approach 2:
The rigid sections are specifically designed to resist deformation under external forces, while the flexible section is designed to deform controllably during folding. This local differentiation of mechanical properties allows the device to maintain structural stability in rigid regions while achieving folding adaptability through the flexible section.
3Manufacturing precision
If the neutral plane is positioned within the flexible display module to minimize deformation, then the display quality is maintained, but the device complexity increases due to multiple adhesive films and positioning requirements
Solution Approach 1:
Double-sided adhesive films are used as intermediary elements to precisely position the neutral plane within the flexible display module. These adhesive films serve as mediators that connect different sections while controlling the neutral plane location, thereby maintaining display quality through a manageable structural approach.
Solution Approach 2:
The position of the neutral plane is controlled by adjusting the thickness and positioning of the double-sided adhesive films. By changing the physical parameters of the adhesive layers, the neutral plane can be precisely located within the flexible display module to minimize deformation and maintain display quality.
Data Source
AI summary
A foldable display device assembly includes a rigid film having first and second sections spaced apart from each other, the rigid film being foldable about a folding axis disposed between the first and second sections of the rigid film; an adhesion structure having first and second adhesion sections spaced apart from each other, the first and second adhesion sections being disposed on the first and second sections of the rigid film, respectively; a lower flexible module disposed on the adhesion structure; a flexible display module disposed on the lower flexible module; and an upper flexible module disposed on the flexible display module.