Foldable Display Device Z-Shape Folding Mechanism
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Solution Overview
Problem
Foldable smartphone designs with biaxial hinges face complexity due to bent display portions that require additional structural support, and Z-shape folding mechanisms need to balance external and internal bending while maintaining a simple structure.
Innovation Solution
A foldable display device with pivotably coupled chassis, including a first and second chassis, a pivot coupling portion, a flexible display, and a support member, where the display has adhesive and non-adhesive portions to simplify the structure and allow Z-shape folding, with a support member that stabilizes the display during opening and closing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biaxial hinges are used in foldable smartphones, then the display can be folded, but the structure becomes complex due to the need for additional base support to accommodate bent display portions
Solution Approach 1:
The patent extracts the support function from the chassis structure and assigns it to a dedicated support member. This support member is specifically designed to support only the non-adhesive portion of the display during folding, separating the support function from the overall chassis structure and reducing overall structural complexity.
Solution Approach 2:
The support member acts as an intermediary element between the chassis and the display's non-adhesive portion. It provides targeted support to the flexible display during folding operations without requiring the entire chassis structure to be redesigned, thus simplifying the overall system while maintaining folding capability.
2Adaptability or versatility
If Z-shape folding is implemented to maximize foldable advantages, then smartphone and tablet sizes are achieved, but both external bending and inner bending of the display must be performed
Solution Approach 1:
The patent segments the display into adhesive portions (attached to chassis) and a non-adhesive portion (flexible and bendable). This segmentation allows different parts of the display to have different functions: the adhesive portions provide structural stability while the non-adhesive portion enables the necessary bending for Z-shape folding.
Solution Approach 2:
The support member is designed with specific local properties - it has a support surface that contacts the non-adhesive portion and curved surfaces that guide folding. This localized quality enhancement provides targeted support and guidance exactly where needed during Z-shape folding without affecting other parts of the structure.
3Stability of the object's composition
If the display is fully adhered to the chassis, then structural stability is improved, but folding capability is reduced due to stress on the display
Solution Approach 1:
The display is segmented into adhesive portions that remain attached to the chassis for structural stability and a non-adhesive portion that remains flexible for bending during folding. This segmentation resolves the contradiction by allowing different parts of the display to fulfill different requirements simultaneously.
Solution Approach 2:
The adhesive portions provide local structural stability where needed, while the non-adhesive portion provides local flexibility for folding. The support member further enhances this by providing localized support to the non-adhesive portion during folding operations, minimizing stress concentration.
Data Source
AI summary
ProblemA first chassis and a second chassis are pivotably coupled with a simple structure in a foldable display device.Solution meansA mobile terminal (1) includes a first chassis (3) and a second chassis (5). A pivot coupling portion (9) couples the first chassis (3) and the second chassis (5) to allow an open state and a closed state. The first chassis (3) and the second chassis (5) are open to enter a planar state in the open state. The first chassis (3) and the second chassis (5) are closed to enter a state of being bent inward in the closed state. A flexible display (7) is arranged to cover main surfaces of the first chassis (3) and the second chassis (5). A support member (11) is arranged between the first chassis (3) and the second chassis (5). The support member (11) has a flat support surface (13a) that supports the flexible display (7) when the flexible display (7) is in the open state. The display (7) includes adhesive portions (7a, 7b) and a non-adhesive portion (7c). The adhesive portions (7a, 7b) are adhered to the first chassis (3) and the second chassis (5). The non-adhesive portion (7c) is separable from the flat support surface (13a) of the support member (11) between the first chassis (3) and the second chassis (5).