Foldable Transmission Assembly With Conductive Fabric for Bending Reliability
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Solution Overview
Problem
Current transmission assemblies in foldable electronic devices, such as foldable screen mobile phones, suffer from poor bending resistance, leading to reliability issues and failure to meet performance requirements.
Innovation Solution
The transmission assembly incorporates a first conductive fabric with a tensile strength greater than 360 Mpa, integrated with a dielectric layer and insulating adhesive layers, enhancing bending resistance and reliability by using conductive fabrics and dielectric materials like polyester fiber and polytetrafluoroethylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmission assembly is configured as a grid shape to reduce stress concentration points, then flexibility is improved, but bending resistance remains poor
Solution Approach 1:
The patent employs a composite structure combining a flexible substrate with a grid-shaped conductive layer. The substrate provides bending resistance and mechanical strength, while the grid-shaped conductive layer maintains flexibility and reduces stress concentration. This composite approach resolves the contradiction by integrating materials with complementary properties.
Solution Approach 2:
The transmission assembly features different structural characteristics in different regions: the grid-shaped conductive layer is positioned in the bending area to provide flexibility and stress distribution, while the substrate provides overall mechanical support. This local differentiation allows each component to optimize its function without compromising the other.
2Adaptability or versatility
If the transmission assembly extends through the rotating shaft assembly to connect circuit boards on two sides, then adaptability is improved, but reliability deteriorates due to poor bending resistance
Solution Approach 1:
The transmission assembly uses a composite structure where the substrate provides mechanical strength and bending resistance, while the grid-shaped conductive layer ensures electrical connectivity and flexibility. This composite design enables the assembly to extend through the rotating shaft while maintaining both adaptability and reliability.
Solution Approach 2:
The grid-shaped conductive layer is specifically positioned in the bending area of the transmission assembly to provide localized flexibility and stress distribution. This local optimization ensures that the transmission assembly can adapt to the rotating shaft configuration while maintaining reliable signal transmission throughout the structure.
Data Source
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AI summary
Provided in embodiments of this application are a transmission assembly and a foldable electronic device. The transmission assembly includes a first transmission assembly. The first transmission assembly is configured for use in a bending area of the foldable electronic device. The first transmission assembly includes at least two first conductive layers and a first transmission layer located between the two first conductive layers. Each first conductive layer includes at least a first conductive fabric, and the first transmission layer includes at least one first signal line. A dielectric layer is further arranged between the first conductive layer and the first transmission layer, and the dielectric layer includes at least a first substrate layer. In this way, the first conductive fabric has good tensile performance during bending of the first transmission assembly, which can improve bending resistance of the first transmission assembly, thereby enhancing reliability of the transmission assembly when the transmission assembly is used in a foldable screen device, and meeting performance requirements for transmission assemblies required in foldable screen devices.