Touch Display Substrate Pin Layout to Prevent Gate-Touch Crosstalk
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Solution Overview
Problem
In OLED TDDI products, the conventional arrangement of pins leads to the intersection of touch traces and gate on array traces, causing signal interference and reducing touch performance.
Innovation Solution
The touch display substrate design includes a first and second peripheral area with specific pin arrangements and non-overlapping test leads, ensuring that the orthographic projections of array test leads do not overlap with touch test leads, thereby preventing signal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pin arrangement is used, then device complexity is reduced, but signal interference occurs causing touch performance degradation
Solution Approach 1:
The pin areas are segmented into distinct functional zones: first gate drive circuit pin area, first touch pin area, second gate drive circuit pin area, and second touch pin area. This segmentation allows independent routing of gate signals and touch signals through separate test leads, preventing signal interference while maintaining organized device structure.
Solution Approach 2:
The patent introduces spatial separation in the layout dimension by positioning pin areas and routing test leads along different paths. The first and second test leads are routed to connect respective pin areas without overlapping, utilizing dimensional arrangement to avoid signal crosstalk between gate and touch circuits.
2Reliability
If test leads are arranged without overlapping projections, then signal interference is prevented, but manufacturing complexity increases
Solution Approach 1:
The pin areas are pre-positioned and designed with predetermined locations before manufacturing. The first gate drive circuit pin area, first touch pin area, second gate drive circuit pin area, and second touch pin area are established in advance with their spatial relationships defined, enabling straightforward fabrication without complex post-processing adjustments.
3Reliability
If binding areas are positioned away from active area, then signal interference is reduced, but device area increases
Solution Approach 1:
The first binding area and second binding area are positioned adjacent to each other in the peripheral region, merging their functions for binding external circuits while maintaining spatial separation from the active display area. This consolidation efficiently utilizes the peripheral space without excessive area expansion.
Data Source
AI summary
A touch display substrate, a manufacturing method therefor, and a touch display device are provided. The touch display substrate includes an active area and a first peripheral area and a second peripheral area located at peripheries of the active area, the second peripheral area includes a first binding area used for binding a driver chip and a second binding area located at one side of the first binding area away from the active area and used for binding a flexible circuit board; the first binding area includes a first gate drive circuit pin area and a first touch pin area; the second binding area includes a second gate drive circuit pin area electrically connected to the first gate drive circuit pin area and a second touch pin area electrically connected to the first touch pin area.