Touch Structure Wiring for Reduced Crosstalk
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Solution Overview
Problem
As display screens increase in size, the existing touch signal wiring methods face challenges with crosstalk and parasitic capacitance, affecting touch uniformity and sensitivity, and the bezel size, due to increased demand for touch signals and touch accuracy.
Innovation Solution
The touch structure employs a novel wiring manner with first and second conductive line groups that converge to a bonding region, where the second conductive line group is further away from the touch area than the first, and the conductive lines are arranged to minimize parallel lengths and maximize distances in the peripheral areas, reducing crosstalk and parasitic capacitance without increasing the bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If display screen size increases, then display area is improved, but crosstalk and parasitic capacitance increase affecting touch uniformity and sensitivity
Solution Approach 1:
The conductive lines are segmented into different groups (first conductive line group and second conductive line group) with different routing paths. The first conductive lines are led out from the third peripheral sub-area while the second conductive lines are led out from the first peripheral sub-area, dividing the signal transmission paths to reduce mutual interference and parasitic capacitance between adjacent lines.
Solution Approach 2:
The patent utilizes the peripheral area dimensions creatively by defining three distinct peripheral sub-areas (first, second, and third) and routing different conductive line groups through different sub-areas. This dimensional arrangement in the peripheral region allows large display screens to maintain good touch performance by spatially separating signal paths.
2Measurement precision
If more touch signal channels are added for larger screens, then touch accuracy is improved, but crosstalk increases
Solution Approach 1:
The touch signal channels are segmented into first and second conductive line groups that are routed through different peripheral sub-areas. This segmentation allows multiple touch signal channels to be added for larger screens while maintaining signal integrity by reducing electromagnetic interference and crosstalk between adjacent channels.
3Reliability
If conductive lines are arranged to reduce parasitic capacitance, then touch sensitivity is improved, but wiring complexity increases
Solution Approach 1:
The patent resolves wiring complexity by utilizing the peripheral area dimensions systematically. The first conductive lines are led out from the third peripheral sub-area while the second conductive lines are led out from the first peripheral sub-area, creating a structured dimensional arrangement that reduces parasitic capacitance without excessive complexity.
4Area of stationary object
If bezel size is reduced for compact design, then device compactness is improved, but wiring space for reducing crosstalk is limited
Solution Approach 1:
The patent applies local quality by creating different routing characteristics for different conductive line groups in different peripheral sub-areas. The first conductive lines have one routing path through the third peripheral sub-area while the second conductive lines have a different routing path through the first peripheral sub-area, allowing optimized local arrangements that reduce crosstalk even with compact overall bezel dimensions.
Data Source
AI summary
A touch structure includes first touch units and second touch units located in a touch area, first conductive lines and at least one second conductive line. Each first conductive line is connected to one first touch unit and led out from a third peripheral sub-area. Each second conductive line is connected to one second touch unit, led out from a first peripheral sub-area and passes through the third peripheral sub-area. Part of the second conductive line located in the third peripheral sub-area is further away from the touch area than part of the first conductive lines located in the third peripheral sub-area. At least one first conductive line is further away from the touch area in a first direction than another first conductive line, and lead-out position of the at least one first conductive line is closer to a second peripheral sub-area than that of the another first conductive line.