Touch Display Panel With Alternating Lines for Lower Parasitic Capacitance
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Solution Overview
Problem
The increase in the number of touch lines in touch display devices degrades touch sensing performance due to reduced area of touch electrodes and increased parasitic capacitance, leading to decreased sensitivity and accuracy.
Innovation Solution
A touch display device with a multi-feeding structure where touch lines are alternately arranged, reducing their number and securing the area of touch electrodes, and employing a shifting area to uniformly distribute parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch lines is increased to improve touch sensing performance, then touch sensing coverage is improved, but the area of touch electrodes is reduced and parasitic capacitance increases
Solution Approach 1:
The touch lines are segmented into two alternating sets (first touch lines and second touch lines) that are spatially separated and serve different functions. This segmentation allows each set of lines to be optimized independently, reducing the overall impact on electrode area while maintaining comprehensive touch sensing coverage across the display panel.
Solution Approach 2:
The patent transitions from a conventional single-layer touch line arrangement to a multi-dimensional alternating pattern where first and second touch lines are interleaved in the vertical direction. This dimensional reorganization reduces the horizontal space required for touch lines, thereby preserving more area for touch electrodes while maintaining sensing performance.
2Measurement precision
If the number of touch lines is increased to improve touch sensing performance, then touch sensing coverage is improved, but parasitic capacitance increases
Solution Approach 1:
The patent extracts and separates the functions of different touch lines into alternating first and second touch lines. By taking out the coupling between adjacent touch lines and replacing it with alternating patterns, the parasitic capacitance between neighboring lines is reduced while maintaining the ability to sense touches across the entire display area.
Solution Approach 2:
The alternating arrangement of first and second touch lines creates an intermediary spatial pattern that reduces direct coupling between adjacent signal lines. This intermediary structure acts as a parasitic capacitance reducer while still providing comprehensive touch sensing coverage through the interleaved configuration.
3Measurement precision
If the area of touch electrodes is reduced to accommodate more touch lines, then touch sensing coverage is improved, but sensitivity and accuracy degrade
Solution Approach 1:
The patent applies local quality optimization by creating different spatial patterns for first and second touch lines in different regions of the display panel. This allows the touch electrode area to be maximized in critical sensing regions while maintaining adequate touch line density for comprehensive coverage, thereby preserving both sensitivity and accuracy.
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
Improves touch sensing performance by minimizing the number of touch lines, maintaining electrode area, and uniformly distributing capacitance, thereby enhancing sensitivity and accuracy.
Implementation Method 1
a plurality of first touch lines extended in a first direction to transmit a plurality of touch driving signals, and a plurality of second touch lines extended in a second direction different from the first direction to transmit a plurality of touch sensing signals
Implementation Method 2
as a length of the touch lines increases, parasitic capacitance due to coupling between the touch lines and the touch electrodes increases
Data Source
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AI summary
Examples 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.