Flexible Circuit Board Layout for Touch Signal Isolation
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Solution Overview
Problem
Existing flexible circuit boards for touch display apparatuses require multiple layers to separate touch signal traces from display panel signal traces, increasing manufacturing costs and defect rates due to signal interference, and occupy valuable space on the backside of the display panel.
Innovation Solution
A flexible circuit board design with two substrates, where display panel signal traces and touch signal traces are connected through transfer traces on one substrate and touch auxiliary devices on another, reducing the need for additional layers and minimizing signal interference, while allowing for a more compact layout and increased space for other components like batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple layers are used to separate touch signal traces from display panel signal traces, then signal interference is reduced, but manufacturing costs increase and defect rates increase
Solution Approach 1:
The patent utilizes the third dimension (vertical stacking) by placing transfer traces on a second substrate above the first substrate. This allows touch signal traces to be routed vertically through via holes, separating them from display panel signal traces in the Z-direction while maintaining a compact two-substrate structure, thereby reducing signal interference without requiring multiple horizontal layers
Solution Approach 2:
The patent introduces a second substrate with transfer traces as an intermediary element between the touch signal traces and display panel signal traces. This intermediate layer facilitates signal transmission while providing spatial separation and reducing electromagnetic interference between different signal types
2Object-affected harmful factors
If multiple layers are used to separate touch signal traces from display panel signal traces, then signal interference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the circuit board into two separate substrates, each carrying specific signal traces. The first substrate carries display panel signal traces while the second substrate carries touch signal traces and transfer traces. This segmentation isolates different signal types, reducing interference and simplifying the manufacturing precision requirements for each individual substrate layer
3Object-affected harmful factors
If additional layers are added for signal trace separation, then signal interference is reduced, but the space on the backside of the display panel is reduced
Solution Approach 1:
The patent transitions from a planar two-dimensional layout to a three-dimensional stacked configuration. By routing touch signal traces vertically through via holes in the via hole region and placing transfer traces on the second substrate, the design achieves effective signal separation while maintaining a compact footprint that preserves valuable backside space for battery and other component placement
Data Source
AI summary
A flexible circuit board includes a first substrate, display panel signal traces, a touch chip, at least one second substrate, a touch auxiliary device, first touch signal traces and at least one second touch signal trace. The display panel signal traces, the touch chip and the at least one second substrate are located on the same side of the first substrate; and the touch auxiliary device is located on a second substrate. The first touch signal trace includes a first connection trace and a first transfer trace that are electrically connected to each other. The second touch signal trace includes a second connection trace and a second transfer trace that are electrically connected to each other. The first connection trace and the second connection trace are disposed on the first substrate, and the first transfer trace and the second transfer trace are disposed on the at least one second substrate.