Integrated Touch Display Pad Layout for Higher Signal-to-Noise
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Solution Overview
Problem
Interference between signals applied to display and touch functions in current touch and display devices due to intersecting leading wires, leading to signal-to-noise ratio degradation.
Innovation Solution
The implementation of a touch and display integrated circuit with separate pad sets and leading wires for display and touch functions, where touch pad sets are positioned between display driving pad sets to prevent intersections and reduce signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display driving pads and touch pads are arranged separately on the panel, then signal interference is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines display driving pads and touch pads into a single integrated pad structure on the flexible printed circuit board. The display driving pads and touch pads are arranged in an interlaced or alternating pattern along the same edge of the FPC, allowing both functions to share the same connection interface with the panel while maintaining signal separation through dedicated leading wire routing.
Solution Approach 2:
The patent arranges display driving pads and touch pads in different spatial dimensions along the edge of the FPC. By positioning them at different locations along the same edge or using alternating patterns, the design separates the pad locations in one dimension while keeping them on the same board edge, reducing intersection of leading wires without requiring separate boards.
2Reliability
If leading wires for display and touch are routed separately, then signal interference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the leading wires into distinct groups: display leading wires connect display driving pads to display circuitry, and touch leading wires connect touch pads to touch circuitry. This segmentation is maintained throughout the FPC routing, with each type of leading wire dedicated to its function, preventing signal crosstalk while allowing standardized manufacturing processes.
Data Source
AI summary
A touch and display integrated circuit (IC) and a touch and display device are disclosed. The touch and display IC includes a first display driving pad set, a second display driving pad set, first touch pad sets, and second touch pad sets. The first display driving pad set and the second display driving pad set are respectively connected to a first display driver and a second display driver on a touch display device through first leading wires. The first touch pad sets are connected to a touch circuit on the touch display device through second leading wires. The second touch pad sets are connected to the touch circuit through third leading wires. The first touch pad sets and the second touch pad sets are disposed between the first display driving pad set and the second display driving pad set, thereby reducing signal interference.