Rotating Shaft Mechanism for Foldable Display Crease Reduction
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Solution Overview
Problem
Foldable mobile terminals with flexible displays face issues of creasing and light shadow due to large curvature when folded, affecting appearance and reliability.
Innovation Solution
A rotating shaft mechanism with different rotation angles for the flexible display and casing, utilizing a base, driving parts, guiding parts, and damping assemblies to manage the relative motion and reduce curvature, ensuring smooth transition and minimizing creasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible display synchronously moves with the casing to be folded, then the operation is simple, but the flexible display has large curvature and obvious creases
Solution Approach 1:
The patent implements differential motion between the flexible display and casing by making the middle frame rotatively connected to both the flexible display and the casing. This allows the middle frame to rotate at a different angle than the casing during folding, creating a dynamic motion relationship that reduces curvature while maintaining operational simplicity.
Solution Approach 2:
The patent divides the folding system into separate rotational components: the casing rotation and the middle frame rotation. By segmenting the motion control, the flexible display can move independently from the casing through the middle frame connection, enabling different rotation angles and reducing crease formation.
2Shape
If the middle frame is expanded at the end close to the base when folded, then the arc transition angle is increased and creases are reduced, but the device complexity increases
Solution Approach 1:
The middle frame serves multiple functions: it acts as a structural support, a rotational connection element between the flexible display and casing, and a mechanism for creating arc transitions. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity despite the expanded motion capability.
Data Source
AI summary
A rotating shaft mechanism and an electronic device comprising the rotating shaft mechanism are provided. In an implementation, the rotating shaft mechanism includes a base, a first driving part, a guiding part, and a second driving part. The base includes a fastener and two first rotating arms. 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. The guiding part includes two guiding blocks. 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, the second rotating arm is fastened to a casing, and the second rotating arm is linked to the guiding block.