Flexible Circuit Board Segmentation for Touch Display Signal Routing
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Solution Overview
Problem
The increase in size of medium-size display panels poses challenges in designing Flexible Printed Circuits (FPCs) due to increased signal lines, making it difficult to reduce the FPC size to accommodate a larger battery space while maintaining touch functionality.
Innovation Solution
A touch display device design featuring a flexible circuit board with separate connectors for display and touch functions, allowing for independent control and reduced FPC size by strategically arranging signal lines and ICs, enabling easier pattern generation and automatic production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display panel size is increased to 7-9 inches with 10:9 aspect ratio, then the display area is expanded, but the number of signal lines increases making FPC design difficult and FPC size increases
Solution Approach 1:
The flexible circuit board is divided into distinct functional regions: a display functional region with display signal lines, and a touch functional region with touch signal lines. This segmentation allows independent routing and management of different signal types, reducing overall design complexity despite the increased number of total signal lines required for the larger display panel.
Solution Approach 2:
The patent utilizes the flexible circuit board's ability to bend and fold, introducing spatial dimensionality changes. By folding the FPC, signal lines can be routed in three-dimensional space rather than being constrained to a single plane, allowing complex signal line arrangements to be compacted into a smaller effective area.
2Reliability
If the FPC size is increased to accommodate more signal lines, then touch functionality is maintained, but battery space is reduced
Solution Approach 1:
By segmenting the FPC into display and touch functional regions, each region can be optimized independently. The touch functional region can be minimized in size while maintaining necessary touch signal routing, thereby reducing overall FPC area and freeing up battery space while preserving touch functionality.
Solution Approach 2:
The flexible circuit board employs dynamic folding structures that allow the FPC to change its spatial configuration. When folded, the FPC occupies less area within the device housing, effectively reducing the space required for the circuit board while maintaining all necessary electrical connections for touch functionality.
3Reliability
If two driving electrode signal lines and one sensing electrode signal line are arranged, then touch sensing capability is achieved, but the quantity of signal lines increases
Solution Approach 1:
The patent combines multiple signal lines into shared routing paths where possible. For example, adjacent touch signal lines are routed parallel to each other through common regions of the FPC, and power/ground lines are bundled together. This merging approach reduces the overall footprint and complexity of signal line arrangement while maintaining the required 2T1R touch sensing capability.
Data Source
AI summary
The present disclosure provides a touch display device which includes a display panel and a flexible circuit board coupled to the display panel. The flexible circuit board includes a display functional region and a touch functional region, the display functional region is coupled to a control mainboard of the touch display device via a first connector, and the touch functional region is coupled to the control mainboard of the touch display device via a second connector.