Touch Display Electrode Layout for Reduced Signal Delay
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Solution Overview
Problem
As the size of touch display devices increases, the length of touch lines increases, leading to parasitic capacitance and degradation of touch sensitivity and accuracy due to time delays in signal transmission.
Innovation Solution
The touch display device and panel are designed with X-touch electrode lines connected through contact holes and shifted at uniform distances, forming a multi-feeding structure to reduce time delays and evenly distribute capacitances, using a combination of X-touch and Y-touch electrode lines with specific shifting and connection patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size is increased, then the display area is improved, but the touch sensitivity and sensing accuracy are degraded due to increased parasitic capacitance and time delay
Solution Approach 1:
The touch electrode lines are divided into multiple segments (first touch electrode lines and second touch electrode lines) arranged in different directions. This segmentation reduces the length of individual touch lines, thereby reducing parasitic capacitance and time delay while maintaining large display area coverage
Solution Approach 2:
Touch electrode lines are arranged in multiple directions (first direction and second direction), creating a two-dimensional network structure. This dimensional approach reduces the effective path length for signal transmission compared to single-direction long lines, reducing time delay and parasitic capacitance effects
2Area of stationary object
If the touch line length is increased, then the display coverage is improved, but the parasitic capacitance increases causing touch sensitivity degradation
Solution Approach 1:
The touch electrode lines are segmented into multiple shorter lines arranged in different directions. This reduces the length of individual conductors, directly reducing parasitic capacitance while maintaining comprehensive display coverage through the multi-directional arrangement
Solution Approach 2:
Different regions of the display panel have touch electrode lines oriented in different directions (first direction in some regions, second direction in others). This local variation optimizes the capacitance distribution across different areas, reducing overall parasitic capacitance while maintaining coverage
3Area of stationary object
If the touch line length is increased, then the display coverage is improved, but the time delay increases causing touch sensitivity degradation
Solution Approach 1:
The touch electrode lines are divided into multiple shorter segments arranged in different directions. This segmentation reduces the maximum signal transmission distance, thereby reducing time delay while maintaining comprehensive display coverage
Solution Approach 2:
By arranging touch electrode lines in multiple directions rather than single long lines, the signal transmission path is shortened. The multi-directional network structure reduces the effective distance signals must travel, reducing time delay while covering the entire display area
Data Source
AI summary
A touch display device and a display panel uniformly distributing capacitances between the touch lines and the touch electrodes are provided. The device includes a display panel in which a plurality of X-touch electrodes are electrically connected to form a X-touch electrode line and a plurality of X-touch electrode lines arranged in parallel to receive a plurality of touch driving signals, and a plurality of Y-touch electrode lines to transmit a plurality of touch sensing signals, and a touch driving circuit. A plurality of X-touch lines transmit the touch driving signals connect together the plurality of X-touch electrodes constituting a same X-touch electrode line through a plurality of contact holes. Distances between at least one Y-touch electrode line and the plurality of contact holes through which the plurality of X-touch lines are electrically connected to the X-touch electrodes adjacent to the at least one Y-touch electrode line are uniform.