Foldable Display Hinge Mechanism With Differential Rotation Angles
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Solution Overview
Problem
Foldable electronic devices with flexible displays face issues of significant curvature and creasing due to large deformation, affecting appearance and reliability.
Innovation Solution
A rotating shaft mechanism with different rotation angles for casings and middle frames, utilizing guiding and driving parts to synchronize and stabilize the motion of rotating arms, reducing curvature through arc transitions and minimizing creasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flexible display synchronously moves with the casing to be folded, then the structure is simple, but the bending part has large curvature and obvious creases
Solution Approach 1:
The patent divides the rotation mechanism into two independent rotation systems: one for the casing (first rotating arm) and one for the middle frame with flexible display (second rotating arm). Each rotation is controlled separately through independent driving parts, allowing different rotation angles and speeds to be achieved without requiring the flexible display to synchronously follow the casing folding motion.
Solution Approach 2:
The patent changes the rotation angle parameter of the middle frame relative to the casing. By making the middle frame's rotation angle greater than the casing's rotation angle (through the guiding part and different driving parts), the flexible display achieves a larger bending radius with smaller curvature, reducing creases while maintaining structural feasibility.
2Reliability
If the curvature of the bending part is reduced through relative translation of two parts of the casing, then the flexible display crease is reduced, but the appearance of the mobile terminal is seriously affected
Solution Approach 1:
The patent uses arc-shaped guiding parts and rotating arm mechanisms to achieve smooth curved transitions for the flexible display during folding. The middle frame rotates along an arc trajectory with a larger radius, creating a more gradual curvature change that reduces creases while maintaining a sleek appearance compared to linear translation methods.
Solution Approach 2:
Instead of using linear translation in one dimension, the patent employs rotational motion in a different dimension (angular displacement). The middle frame rotates relative to the casing through a defined rotation angle, achieving the curvature reduction effect through angular movement rather than linear displacement, thus preserving appearance.
3Device complexity
If the middle frame and casing have the same rotation angle, then the structure is simple, but the flexible display has large curvature and creases
Solution Approach 1:
The patent introduces a guiding part as an intermediary mechanism between the first rotating arm (casing) and the second rotating arm (middle frame). This guiding part translates the casing's rotation into a different rotation angle for the middle frame, enabling precise curvature control of the flexible display while maintaining a relatively simple overall structure through mechanical linkage.
Data Source
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AI summary
A rotating shaft mechanism (030) and an electronic device are provided. The rotating shaft mechanism includes a base (100), a first driving part (200), a guiding part (300), and a second driving part (400). The base includes a fastener (210) and two first rotating arms (230). The fastener is fastened to the base. One end of each first rotating arm is rotatively connected to the fastener, and the other end is fastened to a middle frame (053). The guiding part includes two guiding blocks (310). Each guiding block is rotatively connected to the base, each guiding block corresponds to one first rotating arm, and the guiding block is linked to the first rotating arm. The second driving part includes two second rotating arms (410), the second rotating arm is fastened to a casing (051), and the second rotating arm is linked to the guiding block. When the two second rotating arms rotate relative to each other, two casings are capable of being driven to switch from being unfolded to being folded, the guiding part drives the two first rotating arms to rotate relative to each other, and relative rotation angles of the two first rotating arms are greater than relative rotation angles of the two second rotating arms. The rotating shaft mechanism drives the middle frame and the casing to have different rotation angles.