In-Cell Touch Panel Gate Line Arrangement for DTX Noise Reduction
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Solution Overview
Problem
In self-capacitance type in-cell touch panels integrated into display devices, display-to-touch crosstalk (DTX) noise is significant, leading to complications in touch sensing and increased memory and calculation complexity due to mismatched touch group arrangements with pixels, resulting in large compensation errors.
Innovation Solution
A display device configuration where touch groups with self-capacitance electrodes are arranged along gate lines, with a touch sensing unit analyzing sequential touch signals, a data driver supplying data voltages perpendicular to touch groups, and a timing controller managing image and touch event operations, allowing for reduced parasitic capacitance and simplified DTX compensation using image data as compensation data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch groups are arranged along data lines in the related art configuration, then touch sensing can be implemented, but display-to-touch crosstalk (DTX) noise increases significantly and compensation complexity increases
Solution Approach 1:
The patent segments the touch sensing function by separating touch groups from data lines. Touch groups are arranged along gate lines instead of data lines, creating independent touch sensing pathways that do not interfere with data transmission. This segmentation eliminates the coupling between touch sensing and data display, thereby reducing DTX noise while maintaining touch sensing reliability.
Solution Approach 2:
The patent introduces gate lines as an intermediary element between the touch sensing unit and the display pixels. By routing touch groups along gate lines rather than directly along data lines, the gate line acts as a mediator that isolates the touch sensing signal from the data signal, preventing crosstalk while enabling both functions to coexist in the same panel structure.
2Reliability
If touch groups are arranged along data lines, then touch sensing is enabled, but memory size and calculation complexity increase for DTX compensation
Solution Approach 1:
The patent extracts the touch sensing function from the data line infrastructure and places it along gate lines. This extraction eliminates the need for complex DTX compensation calculations that would be required if touch groups were arranged along data lines. The separation allows simple touch sensing without the computational overhead of compensating for crosstalk between touch and data lines.
3Length of moving object
If self-capacitance electrodes are configured with common electrodes in in-cell type, then panel slimming is achieved, but DTX noise magnitude increases seriously
Solution Approach 1:
The patent segments the electrode functions by separating touch sensing electrodes from display common electrodes in space and timing. Touch groups along gate lines are sensed during dedicated touch periods, while display common electrodes are active during display periods. This temporal and spatial segmentation allows in-cell integration for slimming while preventing the DTX noise that would occur from overlapping electrode functions.
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 configuration enhances touch sensitivity and accuracy by reducing DTX noise and simplifying compensation calculations, thereby improving touch event determination and reducing memory requirements.
Implementation Method 1
a touch panel 50, where a touch panel 50 includes a plurality of self-capacitance electrodes 51
Implementation Method 2
a liquid crystal is affected by the data voltage applied to the pixel electrode and a common electrode (e.g. self-capacitance electrodes) is affected through the liquid crystal, in term of parasitic capacitance
Implementation Method 3
the charged capacitance of the liquid crystal may be changed when an image data is refreshed by every frame
Implementation Method 4
an electric field is generated between the pixel electrode and the common electrode to derive the liquid crystal for displaying an image may cause unwanted noise for the touch
Data Source
AI summary
Discussed are a display device and a method of driving the same. The display device can include a panel where a plurality of touch groups including a plurality of self-capacitance electrodes are arranged along with a plurality of gate lines, a touch sensing unit configured to analyze a plurality of touch sensing signals sequentially received from the plurality of touch groups to determine a touch event on the panel, during a plurality of touch sensing periods included in one frame period, a data driver configured to respectively supply data voltages to a plurality of data lines which are provided in the panel in a direction perpendicular to the plurality of touch groups, a gate driver configured to sequentially supply a scan pulse to the plurality of gate lines, and a timing controller configured to supply image data to the data driver.