Display Panel Signal Routing to Prevent Interference
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Solution Overview
Problem
In OLED display panels with an FMLOC structure, touch driving and signal receiving lines often intersect with MIPI signal lines, leading to signal interference and noise, which existing multi-layer flexible printed circuit board designs fail to adequately address.
Innovation Solution
A display panel design where touch driving and signal receiving lines are connected to a flexible printed circuit board via a bonding area, with specific section arrangements and layering to prevent overlap with display signal lines, ensuring non-interference and efficient signal shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If touch driving line and signal receiving line are connected to flexible printed circuit board via bonding area, then signal interference is prevented, but device complexity increases due to specific section arrangements and layering
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar routing approach to a three-dimensional layered architecture. The bonding area is divided into multiple layers (first bonding layer, second bonding layer) with signal lines routed on different vertical levels. This allows touch driving lines, signal receiving lines, and display signal lines to coexist without overlapping in the same plane, thereby preventing signal interference while managing structural complexity through vertical stratification.
Solution Approach 2:
The bonding area is segmented into distinct functional sections: a first bonding area for connecting touch driving lines, a second bonding area for connecting signal receiving lines, and a third bonding area for display signal lines. This segmentation isolates different signal types into separate regions, preventing interference while maintaining organized routing paths that reduce overall structural complexity.
2Object-affected harmful factors
If multi-layer flexible printed circuit board is used with wire grounding terminal layer, then signal shielding is achieved, but manufacturing cost and device thickness increase
Solution Approach 1:
The patent merges the bonding area functions with the flexible printed circuit board structure by integrating signal routing and grounding functions into a unified multi-layer design. The wire grounding terminal layer is combined with the bonding area layers, where grounding terminals are strategically placed on specific layers to provide shielding without requiring separate grounding structures. This integration reduces manufacturing complexity while maintaining effective signal noise shielding.
Solution Approach 2:
The patent applies local quality by implementing grounding terminals and shielding structures only in specific regions where signal interference is most likely to occur. Rather than providing uniform shielding throughout the entire flexible printed circuit board, grounding terminals are placed locally near sensitive signal lines and bonding areas, achieving effective noise shielding while reducing overall material usage and manufacturing complexity.
Data Source
AI summary
The disclosure provides a display panel and a displaying device. The display panel comprises a bonding area and an active area; a flexible printed circuit board, the flexible printed circuit board being arranged on a side, away from the active area, of the bonding area, and comprising a display signal line which extends in a first direction and is electrically connected to the bonding area; and a touch driving line and a signal receiving line, the touch driving line and the signal receiving line being connected to the flexible printed circuit board from the active area via the bonding area, and the display signal line not overlapping with the touch driving line or the signal receiving line.