Touch Display Panel Electrode Layout for Low-Parasitic Sensing
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Solution Overview
Problem
Increasing the number of touch lines in touch display devices degrades touch sensing performance due to reduced area of touch electrodes and increased parasitic capacitance, affecting sensitivity and accuracy.
Innovation Solution
The touch display device employs a design where X-touch electrode lines are alternately connected through touch contact holes to Y-touch electrode lines, with uniform spacing and shifting patterns, reducing the number of touch lines and maintaining electrode area, thereby minimizing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of touch lines is increased to improve touch sensing performance, then the touch sensing performance is improved, but the area of touch electrodes is reduced
Solution Approach 1:
The touch electrode structure is segmented into multiple touch electrode lines (first touch electrode lines and second touch electrode lines) that are alternately arranged. This segmentation allows the touch sensing area to be divided into multiple regions, each served by dedicated electrode lines, thereby maintaining large electrode areas while improving touch sensing performance through distributed sensing points.
2Reliability
If the number of touch lines is increased to improve touch sensing performance, then the touch sensing performance is improved, but parasitic capacitance increases
Solution Approach 1:
Different regions of the touch electrode structure are assigned different functions: first touch electrode lines are dedicated to receiving touch driving signals, while second touch electrode lines are dedicated to transmitting touch sensing signals. This local differentiation reduces parasitic capacitance by minimizing unnecessary electrical connections and signal paths, as each region operates with a specific function rather than requiring multiple interconnected lines throughout.
3Quantity of substance
If the length of touch lines is increased to connect more electrodes, then more electrodes can be connected, but parasitic capacitance due to coupling increases
Solution Approach 1:
The touch electrode structure transitions from a single-dimensional linear arrangement to a two-dimensional alternating arrangement of first and second touch electrode lines. This dimensional change allows multiple electrodes to be connected through a grid-like structure where electrodes are distributed across both line types, increasing the number of connected electrodes without requiring excessively long individual lines, thereby controlling parasitic capacitance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves touch sensing performance by reducing the number of touch lines and securing electrode area, enhancing sensitivity and accuracy while maintaining electrical connectivity and reducing parasitic capacitance.
Implementation Method 1
a plurality of X-touch lines transmitting the plurality of touch driving signals to the plurality of X-touch electrode lines are extended in the second direction and are alternately connected to the plurality of X-touch electrodes through a plurality of touch contact holes to electrically connect a plurality of X-touch electrodes constituting a same X-touch electrode line
Data Source
AI summary
Embodiments of the present disclosure relate to a touch display device and a display panel. The touch display device comprises a display panel in which a plurality of X-touch electrodes arranged in a first direction 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 are extended to a second direction to transmit a plurality of touch sensing signals; and a touch driving circuit for supplying the plurality of touch driving signals to the plurality of X-touch electrode lines and for sensing a touch by detecting the plurality of touch sensing signals from the plurality of Y-touch electrode lines, wherein a plurality of X-touch lines transmitting the plurality of touch driving signals to the plurality of X-touch electrode lines are extended in the second direction and are alternately connected to the plurality of X-touch electrodes through a plurality of touch contact holes to electrically connect a plurality of X-touch electrodes constituting a same X-touch electrode line.