Synchronized Foldable Display Hinge for Low-Crease Inward Folding
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Solution Overview
Problem
Foldable display products with U-shaped inward folding develop creases on screens after repeated bending, affecting display quality due to uneven stress distribution and potential damage to the film layer.
Innovation Solution
A hinge apparatus with a rotating portion and a co-moving portion, featuring non-circular and circular arc guide grooves and rotating portions, allows for synchronous rotation of supporting plates, reducing stress on the display screen by compensating for stretching and preventing pulling or squeezing during bending, thereby minimizing crease formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If U-shaped inward folding is used for foldable display products, then the display can be folded into a compact form, but creases form on the screen after repeated bending due to uneven stress distribution
Solution Approach 1:
The patent employs non-circular arc guide grooves and rotating portions with specific curvature profiles to create a controlled bending path. This curved geometry distributes stress more evenly across the display screen during folding, preventing the formation of creases while maintaining the foldable capability. The non-circular arc design specifically addresses the stress concentration issue by optimizing the curvature distribution along the bending path.
Solution Approach 2:
The patent changes the bending radius and curvature parameters by using non-circular arc guide grooves instead of traditional circular arcs. This parameter modification allows for optimized stress distribution during the folding process, reducing peak stresses that cause crease formation while preserving the display's foldable functionality.
2Device complexity
If traditional circular arc guide grooves are used, then the hinge structure is simple, but the display screen experiences pulling or squeezing during bending causing creases
Solution Approach 1:
The patent replaces traditional circular arc guide grooves with non-circular arc guide grooves that have optimized curvature profiles. This geometric modification creates a more favorable bending path that eliminates pulling and squeezing effects on the display screen during folding, while the hinge structure remains mechanically simple and manufacturable.
3Device complexity
If the first supporting plate and second supporting plate rotate independently, then the hinge apparatus has simple structure, but the stress distribution on the display screen is uneven leading to creases
Solution Approach 1:
The patent merges the rotation control of the first and second supporting plates by using a shared non-circular arc guide groove structure. This integration ensures that both supporting plates follow coordinated bending paths with synchronized stress distribution, eliminating uneven stress concentration that leads to creases, while avoiding the complexity of independent control mechanisms.
Solution Approach 2:
The non-circular arc guide grooves provide optimized curvature profiles that ensure uniform stress distribution across the display screen during folding. The specific geometric parameters of these grooves are designed to balance the stress on both supporting plates simultaneously, preventing crease formation through improved stress homogeneity.
Data Source
AI summary
Disclosed is a hinge apparatus including a rotating portion and a co-moving portion; the rotating portion includes a first supporting plate, a second supporting plate, a first connection plate, and a second connection plate; the first connection plate and the second connection plate are respectively connected with the first supporting plate and the second supporting plate in a slidable manner; the co-moving portion includes a first connection rod, a second connection rod, a first rotating shaft, a second rotating shaft, and a transmission apparatus; the first connection rod is fixedly connected on the first rotating shaft and is connected with the first connection plate in a slidable manner, the second connection rod is fixedly connected on the second rotating shaft and is connected with the second connection plate in a slidable manner, and the transmission apparatus is disposed to rotate the first rotating shaft and the second rotating shaft synchronously.