FPC Connecting Head with Reinforcement Plate for High-Density PINs
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Solution Overview
Problem
Traditional flexible printed circuits (FPCs) used in touch screens and display screens have limitations such as a PIN pitch greater than or equal to 0.8 mm, which restricts the accommodation of multiple interfaces, are prone to damage during welding, and cannot be reused, leading to waste and inconvenient maintenance.
Innovation Solution
A flexible printed circuit connecting head with a reinforcement plate and multiple insulation and circuit layers, allowing for reduced PIN distance, improved strength, and ease of installation and removal, enabling the accommodation of various interfaces and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a welded FPC is used to connect touch screen and display screen to driver circuit board, then the connection is established, but the PIN pitch is limited to greater than or equal to 0.8 mm and the FPC welding part is easy to damage and cannot be re-used
Solution Approach 1:
The FPC connecting head is divided into a rigid connecting head portion and a flexible circuit layer portion. The rigid connecting head portion contains the metal fingers and insulation layers, while the flexible circuit layer can be bent and folded. This segmentation allows the rigid part to provide stable electrical connection with small PIN pitch, while the flexible part accommodates bending requirements, resolving the contradiction between connection reliability and interface adaptability.
Solution Approach 2:
The patent transitions from traditional 2D welding connection to a 3D plug-socket connection structure. The metal fingers extend beyond the insulation layers to form plug contacts that insert into corresponding socket contacts on the driver circuit board. This dimensional change enables higher density PIN arrangement (smaller pitch) while maintaining connection reliability through the plug-socket mechanism.
2Ease of manufacture
If traditional welded FPC is used, then connection is achieved, but the FPC cannot be removed and re-used, causing waste and inconvenient maintenance
Solution Approach 1:
The connection structure changes from static welded connection to dynamic plug-socket connection. The FPC connecting head with metal fingers can be plugged into the driver circuit board and easily removed when needed. This dynamic connection maintains ease of manufacture through standardized plug-socket interfaces while dramatically improving ease of repair and maintenance, as the FPC can be removed and replaced without damage.
Solution Approach 2:
The patent enables recovery and reuse of the FPC connecting head assembly. Unlike welded FPC that becomes damaged and unusable after removal, the plug-socket design allows the FPC to be repeatedly connected and disconnected without degradation. This principle of discarding and recovering applies by allowing the FPC to be recovered (removed intact) for maintenance or replacement of other components.
3Stability of the object's composition
If FPC welding part is designed for permanent connection, then connection stability is ensured, but the FPC cannot be removed for maintenance or reuse
Solution Approach 1:
The connection structure transitions from static permanent welding to dynamic reversible plug-socket connection. The metal fingers in the rigid connecting head portion provide stable electrical contact when plugged in, while the overall assembly can be easily removed and reinstalled. This dynamic design simultaneously achieves connection stability during operation and ease of operation for installation/removal.
4Quantity of substance
If multi-layer insulation and circuit layers are used to reduce PIN distance, then high-density wiring is achieved, but the structure becomes more complex
Solution Approach 1:
The patent uses multiple insulation layers (first, second, third insulation layers) with circuit layers sandwiched between them to create a 3D multi-layer structure. This vertical stacking allows many more PINs to be accommodated in a compact space by utilizing the third dimension. The metal fingers extend from the circuit layers through the insulation layers to form the plug contacts, achieving high-density wiring without excessive horizontal complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows for a lighter, thinner, and more flexible connection that supports high-density wiring, reduces waste, and facilitates convenient maintenance by enabling the coexistence of multiple interfaces and easy plug-in/plug-out functionality.
Implementation Method 1
Gold is plated or deposited on upper surfaces of the foreparts of the conductive strips of the first circuit layer to form metal layers
Data Source
Figure 1~2
Figure 3
AI summary
The present invention discloses a flexible printed circuit (FPC) connecting head, including a first insulation layer (5), a first circuit layer (2), a second insulation layer (4), a second circuit layer (6), and a third insulation layer (1) which are disposed in sequence from bottom to top. The first circuit layer (2) is arranged between the first insulation layer (5) and the second insulation layer (4). The second circuit layer (6) is arranged between the second insulation layer (4) and the third insulation layer (1). The first circuit layer (2) is composed of a plurality of conductive strips, foreparts (3) of the plurality of conductive strips are arranged in parallel at equal intervals. A plurality of conductive strips on the second circuit (6) layer pass downwards (7) through the second insulation layer (4) and are correspondingly connected with the plurality of conductive strips on the first circuit layer (2). The FPC connecting head is also provided with a reinforcement plate (8) which is arranged on an underside surface of the first insulation layer (5) or an upper surface of the third insulation layer (1). The FPC connecting head provided by the present invention is simple in structure and convenient to use. A plug-type interface is provided by means of connecting a reinforcement plate at the top or at the bottom, so that the strength of a plugged part is improved, installation and removal are convenient, reuse is realized, the cost is saved, and waste is avoided.