Touch Wire Layout With Dummy Pads to Prevent Display Shorts
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Solution Overview
Problem
Existing display devices face challenges in preventing short circuits between touch signal wires and pads on the printed circuit board due to misalignment or proximity issues.
Innovation Solution
The display device incorporates a design with dummy panel pads and circuit pads that are wider and closer together than regular pads, with touch connection wires positioned between these dummy pads to maintain alignment and prevent shorts, and uses conductive balls for electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch connection wires are positioned close to panel pads for compact design, then device area is reduced, but risk of short circuit between wires and pads increases
Solution Approach 1:
Dummy pads are introduced as intermediary elements positioned between the touch connection wires and the actual panel pads. These dummy pads serve as spacing buffers that prevent direct proximity between wires and functional pads, thereby eliminating short circuit risks while allowing compact overall layout
Solution Approach 2:
The pad region is segmented into functional panel pads and dummy pads. This segmentation allows the wires to be routed through the dummy pad regions without interfering with the functional pad areas, enabling compact wire routing while maintaining electrical isolation
2Reliability
If alignment margin between wires and adjacent components is increased to prevent short circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
Dummy pads are created as copies or replicas of the actual panel pads. These dummy pads replicate the pad structure and positioning patterns, allowing the wire layout to follow the same geometric framework while maintaining safety margins. This copying approach preserves layout simplicity while ensuring reliability
3Reliability
If dummy panel pads and dummy circuit pads are added to prevent shorts, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The dummy pads are designed with the same material properties, geometric characteristics, and fabrication processes as the actual panel pads. This homogeneity allows the dummy pads to be manufactured using identical existing processes, eliminating additional manufacturing complexity while achieving the reliability benefit
Data Source
AI summary
A display device includes a display panel including a display area and a peripheral area defined around the display area, a touch sensor including a touch sensing electrode disposed on the display panel and overlapping the display area of the display panel, a plurality of panel pads disposed on the peripheral area of the display panel, a plurality of dummy panel pads disposed on the peripheral area of the display panel and spaced apart from the plurality of panel pads, a driving circuit chip disposed between the display area and the plurality of panel pads, and between the display area and the plurality of dummy panel pads, and a touch connection wire connected to the touch sensing electrode and the driving circuit chip, where the touch connection wire is disposed between the plurality of dummy panel pads in a plan view.