Rotatable Display Module FPC Structure for Torsion Resistance
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Solution Overview
Problem
Existing display devices face challenges in efficiently switching between horizontal and vertical screen orientations without causing damage to the flexible printed circuit board during rotation, which affects reliability and energy consumption.
Innovation Solution
A display module with a flexible printed circuit board featuring stacked connecting bands and thinning grooves to enhance torsion resistance, combined with a hollow rotation shaft for seamless rotation, ensuring electrical connectivity and reducing thickness for easier bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the flexible printed circuit board is made thicker to improve strength, then the board becomes more rigid and durable, but it becomes harder to bend and rotate, increasing the risk of damage during orientation switching
Solution Approach 1:
The flexible printed circuit board is divided into multiple connecting bands stacked together. Each band can bend independently to some extent, and the stacked structure allows the board to flex while maintaining overall strength. This segmentation resolves the contradiction by making the board both strong (multiple layers) and flexible (individual bands can bend).
Solution Approach 2:
The flexible printed circuit board uses a composite structure with multiple materials: flexible substrate material, conductive traces, and protective layers. This composite construction provides both the necessary strength and flexibility, allowing the board to withstand rotation and bending without damage.
2Ease of operation
If the flexible printed circuit board is made thinner to improve flexibility for rotation, then the board becomes easier to bend, but it becomes more susceptible to damage and less durable
Solution Approach 1:
By dividing the circuit board into multiple thin connecting bands stacked together, each band remains thin and flexible for easy rotation, while the stacked configuration provides cumulative strength and durability. The segmentation allows each layer to be thin yet the assembly to be robust.
Solution Approach 2:
The patent employs thin flexible film structures for the connecting bands, which inherently provide both flexibility and durability. The thin film design allows easy bending and rotation while the multi-layer construction maintains reliability through redundancy and distributed stress.
3Ease of manufacture
If the flexible printed circuit board uses a traditional single-layer structure, then the manufacturing process is simple, but the torsion resistance is insufficient during rotation
Solution Approach 1:
The circuit board is segmented into multiple connecting bands that are stacked and connected. This segmented structure naturally provides torsion resistance as each band contributes to the overall rotational strength, while the modular design actually simplifies manufacturing by allowing standardized production of individual bands that are then assembled.
Solution Approach 2:
The multi-layer composite structure of stacked connecting bands provides enhanced torsion resistance compared to a single-layer board. The composite construction distributes mechanical stress across multiple layers, improving rotational durability while maintaining manufacturing feasibility through standardized layer production and assembly.
4Reliability
If the flexible printed circuit board is designed with complex folding structures to enable rotation, then the connectivity during orientation switching is maintained, but the device complexity increases
Solution Approach 1:
The circuit board is divided into multiple connecting bands with standardized folding structures. Each band has a simple, repetitive fold pattern that maintains electrical connectivity. The segmentation allows the complex rotation function to be achieved through simple, repeated structural units rather than a single complex design.
Solution Approach 2:
The flexible printed circuit board uses dynamic folding structures that adapt during rotation. The connecting bands can bend and flex as needed, providing automatic adjustment during orientation switching. This dynamic behavior maintains connectivity without requiring complex active control mechanisms, reducing overall device complexity.
Data Source
AI summary
Provided is a display module. The display module includes: a display panel, a first printed circuit board, and a flexible printed circuit board; wherein the display panel is electrically connected to the first printed circuit board, the first printed circuit board is disposed at a back of the display panel, and the flexible printed circuit board includes a first connecting portion, a second connecting portion, and a flexible connecting structure, wherein the flexible connecting structure includes a plurality of stacked connecting bands, two ends of the flexible connecting structure are connected to the first connecting portion and the second connecting portion respectively, the first connecting portion is connected to the first printed circuit board, and the second connecting portion is configured to be connected to the host.