Rotating Shaft Hinge Structure for Thin Foldable Displays
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Solution Overview
Problem
Foldable mobile terminals face challenges in achieving a thin profile when folded due to the thickness of traditional bent hinge mechanisms, which affects the folding effect and reliability of the device.
Innovation Solution
A rotating shaft mechanism comprising a primary shaft component, swing arm component, and support component, with connection rods and swing arms that allow for synchronized rotation and sliding, enabling the housings to fold while maintaining a thin profile by forming a space that accommodates the flexible display, and a position limiting mechanism for stable folding and unfolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional bent hinge mechanism is used, then the folding function is achieved, but the thickness of the folded device is greater than the thickness of the entire system
Solution Approach 1:
The patent applies nesting by placing the flexible display and supporting components inside the folding space formed by the support plates and primary shaft component. The swing arm component enables this nesting by changing the movement manner of the support component, allowing the display to be accommodated within the device thickness when folded.
Solution Approach 2:
The patent uses dimensionality change by transitioning from a traditional hinge rotation to a swing arm mechanism that moves in multiple dimensions. The swing arms rotate around axes parallel to the primary shaft component while also sliding relative to connection rods, creating a three-dimensional folding motion that achieves a thinner profile.
2Length of moving object
If the swing arm component changes the movement manner of the support component, then the folding effect is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the foldable mechanism into distinct components: primary shaft component, swing arm component (with connection rod groups and swing arm groups), and support component (with support plates). This segmentation allows each component to perform its specific function while working together to achieve the overall folding effect.
Solution Approach 2:
The patent uses dynamics by making the support component movable through the swing arm mechanism. The support plates can rotate relative to swing arms and slide relative to connection rods, transforming from a static support structure to a dynamic system that adapts during folding and unfolding operations.
3Shape
If the support plates and primary shaft component encircle to form folding space, then the bending effect of flexible display is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by allowing the swing arms to rotate around different axes (axis around which swing arm rotates is different from axis around which connection rod rotates). This change in rotational parameters enables the formation of the encircling folding space while accommodating manufacturing tolerances through the sliding connection mechanism.
Data Source
AI summary
A connection rod and a swing arm are separately rotatably connected to a primary shaft component, and an axis around which the swing arm rotates and an axis around which the connection rod rotates are different, so that the swing arm and the connection rod rotate and slide relative to each other. The swing arm or the connection rod drives a support plate to rotate, so that the primary shaft component and the support plates can encircle to form, when the mobile terminal is completely folded, space that accommodates a folded part of a flexible display.