Foldable Terminal Hinge Geometry to Prevent Display Wrinkles
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Solution Overview
Problem
Existing rotating mechanisms in foldable terminals cause stretching of the display during folding, leading to wrinkles and affecting the reliability of the device.
Innovation Solution
A rotating mechanism with a neutral layer and arc-shaped grooves and shafts that match the bending process of the display, reducing stretching and curvature changes to prevent wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional rotating mechanism is used for folding, then the folding function is achieved, but the display is stretched causing wrinkles
Solution Approach 1:
The rotating shaft is designed with an arc-shaped cross-section matching the curvature radius of the display's neutral layer. This curved geometry allows the rotating mechanism to follow the natural bending path of the display during folding, preventing stretching and wrinkle formation while enabling smooth folding operation.
2Productivity
If the rotating mechanism stretches the display during folding, then the folding motion is enabled, but wrinkles appear on the display
Solution Approach 1:
The patent changes the geometric parameters of the rotating shaft from a conventional circular cross-section to an arc-shaped cross-section. The curvature radius of the arc-shaped shaft is specifically designed to match the neutral layer curvature radius of the display, creating a parameter match that eliminates stretching during folding while maintaining folding motion capability.
Data Source
AI summary
Embodiments of this application provide a rotating mechanism and a foldable terminal. The foldable terminal includes a display and the rotating mechanism. The display includes a neutral layer. The rotating mechanism includes a limit base, a first swing arm, and a second swing arm, and the limit base is provided with a first arc-shaped groove and a second arc-shaped groove. The first rotating shaft portion includes a first arc-shaped part and a second arc-shaped part that are distributed in a circumferential direction of the first rotating shaft portion, the first arc-shaped part and the second arc-shaped part are fixedly connected, an axle center of the first arc-shaped part and an axle center of the second arc-shaped part are both located at the neutral layer and coincide with each other, and a radius of the first arc-shaped part is different from a radius of the second arc-shaped part.