Interface Board Ground Shielding for FPC Signal Stability
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Solution Overview
Problem
High-speed data transmission through Flexible Printed Circuits (FPCs) in electro-optical devices is challenging due to instability of high-frequency signals.
Innovation Solution
An electro-optical device with an interface board featuring a flexible film board, terminals, wiring lines, and conductive members, where the conductive members are strategically placed to overlap wiring lines and set to ground potential, reducing signal loss and ensuring stable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed data transmission is performed through the FPC, then data transmission speed is improved, but high-frequency signal stability deteriorates
Solution Approach 1:
A ground conductive member is introduced as an intermediary between the signal wiring line and the reference potential, serving as a mediator to stabilize the high-frequency signal by providing a controlled impedance environment and reducing electromagnetic interference during high-speed data transmission
Solution Approach 2:
The ground conductive member is positioned on the opposite surface of the FPC relative to the signal wiring line, utilizing the third dimension (depth/thickness) to create a layered structure that provides shielding and impedance control without interfering with the planar layout of signal traces
2Loss of energy
If the first conductive member is formed to overlap the wiring line, then signal loss is reduced, but device structure becomes more complex
Solution Approach 1:
The ground conductive member on the opposite surface of the FPC serves multiple functions simultaneously: it provides reference potential for impedance control, shields the signal wiring line from external interference, and reduces signal loss through capacitive coupling, thereby reducing signal loss without proportionally increasing structural 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 effectively stabilizes high-frequency signal transmission by minimizing signal loss and ensuring reliable data transfer during high-speed operations, while also facilitating uniform bonding and heat transfer during assembly.
Implementation Method 1
a first conductive member that is formed on the other surface of the film board and that is coupled with ground wiring lines. Further, the first conductive member overlaps at least one wiring line among the plurality of wiring lines in plan view
Data Source
AI summary
An electro-optical device includes an electro-optical panel, and an interface board through which an image display signal is supplied to the electro-optical panel. The interface board includes a flexible film board, a plurality of terminals that are disposed on the film board, a plurality of wiring lines that are disposed on one surface of the film board and that are electrically connected to the terminals, respectively, and a first conductive member that is formed on the other surface of the film board and that is grounded. The first conductive member overlaps at least one of the wiring lines when the film board is seen in plan view, and the first conductive member is formed along the one wiring line.