Foldable Display Rotary Shaft With Non-Circular Bending Path
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Solution Overview
Problem
In the manufacturing of foldable display products, the circular arc motion trajectory of rotary shafts during folding leads to tension on the screen, causing fatigue and potential damage due to repeated pulling during dynamic bending reliability testing.
Innovation Solution
A rotary shaft mechanism is designed with a curved base, screen support plates, a curved slider, and a rotating block, where the vertical distance between the rotation centers of the curved slider and the rotating block differs, allowing for a non-circular arc motion trajectory that reduces tension on the screen during folding. This mechanism includes sliding and rotatable connections to facilitate parallel movement between the rotating block and the screen support plate, along with additional features like pin-shape shafts, sliding connectors, and a gear group to manage the folding process effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular arc motion trajectory is used for the rotary shaft, then the structure is simple and easy to manufacture, but the screen is subjected to tension during folding which causes fatigue and damage
Solution Approach 1:
The rotary shaft mechanism transitions from a static circular arc trajectory to a dynamic motion path. The curved slider moves along the curved guide groove, and the rotating block rotates relative to the screen support plate, creating a compound motion trajectory that adapts to the screen's bending requirements and reduces tension during folding.
Solution Approach 2:
The invention adds a rotational dimension to the traditional linear sliding motion. The rotating block introduces a second degree of freedom by rotating relative to the screen support plate while the curved slider moves along the curved guide groove, transforming the motion from one-dimensional to two-dimensional compound motion that eliminates screen tension.
2Reliability
If the vertical distance between rotation centers of curved slider and rotating block is made different, then screen tension is reduced, but the device complexity increases
Solution Approach 1:
The invention merges the sliding function of the curved slider with the rotational function of the rotating block into a single integrated mechanism. The curved slider moves along the curved guide groove while simultaneously driving the rotating block to rotate relative to the screen support plate, combining two motion functions into one compact assembly that reduces overall device complexity.
Solution Approach 2:
The curved guide groove with its specific radius of curvature is designed to guide the curved slider along a path that naturally produces the desired compound motion. The curvature of the guide groove works in conjunction with the different vertical distances between rotation centers to generate the optimal motion trajectory that reduces screen tension without requiring additional complex control mechanisms.
Data Source
AI summary
Provided is a rotary shaft mechanism including a curved base, a screen support plate, a curved slider, and a rotating block; the curved base includes a first centerline extending along X direction and two curved connecting portions symmetrically arranged around the first centerline; in the X direction, the screen support plates are on opposite sides of the curved base, each curved connecting portion is connected to the corresponding screen support plate through the curved slider and the rotating block; along the X direction, each curved connecting portion is divided into first and second curved guide grooves, the rotating block includes a curved connector connected to the first curved guide groove, and a sliding connector slidably connected to the screen support plate; the curved slider is rotatably connected into the second curved guide groove, and the curved slider is rotatably connected to the screen support plate through a pin-shape shaft.