Edge-to-Edge Flexible Circuit Coupling with Reduced Z-Height
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Solution Overview
Problem
Existing flexible circuit technologies face challenges in achieving low-profile connections with printed circuit boards due to the requirement for additional z-height and limited pin density, which restricts their use in thin form factor electronic devices.
Innovation Solution
The implementation of a hardware interface with contacts on opposite sides of a flexible circuit device and a printed circuit board, allowing for edge-to-edge coupling with reduced z-height and increased pin count, enabling the use of low-cost flexible flat cables without compromising signal integrity or electromagnetic interference performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional connector hardware is used to couple flexible circuit to PCB, then connection is achieved, but additional z-height thickness of at least 0.8 mm (typically 1.2 mm) is required
Solution Approach 1:
The patent transitions from traditional single-sided connector contact to multi-sided contact arrangement. Contacts are disposed on multiple sides of the flexible circuit substrate (first side, second side, third side, fourth side), utilizing three-dimensional spatial arrangement to achieve edge-to-edge coupling. This dimensional change eliminates the need for z-height extending connector hardware while maintaining electrical connection functionality.
Solution Approach 2:
The connector structure is nested within the flexible circuit substrate itself rather than extending outward. The contacts are integrated into the substrate edges, with conductive traces routed through the substrate thickness to connect contacts on opposite sides. This nesting approach eliminates protruding connector hardware and achieves the low-profile connection goal.
2Quantity of substance
If single sided high-density pinouts with less than 0.3 mm pitch are used, then connection density is improved, but staggered fingers are required which complicates manufacturing and limits low-cost FFC solutions
Solution Approach 1:
The electrical connection is segmented into multiple independent contact points distributed across four sides of the flexible substrate. Each side carries a portion of the total pin count, with conductive traces routing signals from contacts on one side to contacts on the opposite side. This segmentation allows for simpler, non-staggered finger configurations that are easier to manufacture while achieving high total pin count.
Solution Approach 2:
The flexible circuit substrate serves multiple functions: it provides mechanical flexibility, electrical connection, and structural support for the connector. The multi-sided contact arrangement allows the same substrate structure to accommodate various pin configurations and orientations, making the design universal and compatible with low-cost FFC manufacturing processes.
3Length of moving object
If flexible circuit devices are incorporated into very thin form factor devices, then device thickness is reduced, but connection z-height requirements limit the ability to achieve very thin profiles
Solution Approach 1:
The connection architecture changes from z-height extending contacts to edge-to-edge coupling within the plane of the flexible substrate. Contacts on opposite sides of the substrate create parallel signal paths that maintain electrical reliability without requiring additional thickness. This dimensional reconfiguration enables very thin device profiles while preserving connection stability.
4Length of moving object
If edge-to-edge coupling with contacts on opposite sides of substrate is implemented, then z-height is reduced to 0.2 mm or less, but complex multi-sided contact arrangement is required
Solution Approach 1:
Multiple contact points on opposite sides of the flexible substrate are merged into integrated connector assemblies. Conductive traces within the substrate connect corresponding contacts, merging the electrical pathways into a unified connection structure that achieves edge-to-edge coupling. This merging simplifies the overall assembly process despite the multi-sided contact arrangement.
Data Source
AI summary
Techniques and mechanisms for coupling a flexible circuit device to another device. In an embodiment, a substrate includes a first side and a second side opposite the first side, where first contacts of a hardware interface are disposed on the first side, and second contacts of the hardware interface are disposed on the second side. First interconnects and second interconnects variously extend in the substrate, where the first contacts are coupled via the first side each to a respective one of the first interconnects, and the second contacts are coupled via the second side each to a respective one of the second interconnects. In another embodiment, the substrate is one of a flexible substrate and a printed circuit board substrate, where the first interface is configured to couple the substrate, in an edge-to-edge configuration, with the other of a flexible substrate and a printed circuit board substrate.