In-Cell Touch Electrode Segmentation for Parasitic Capacitance Reduction
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Solution Overview
Problem
In in-cell touch type display devices, the parasitic capacitance increases due to the close proximity of touch electrodes, leading to decreased touch sensing performance, especially as screen size enlarges, affecting the accuracy of touch input detection.
Innovation Solution
The touch electrodes are physically divided into multiple groups, with separate driving and receiving electrode lines for each group, allowing for simultaneous touch signal sensing and driving, reducing parasitic capacitance and enhancing touch sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If touch electrodes are formed in close proximity in an in-cell touch type display device, then the display device achieves an aesthetic design and slim profile, but parasitic capacitance increases leading to decreased touch sensing performance
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes (first touch electrode and second touch electrode) that are disposed at different positions within the pixel. This segmentation reduces the parasitic capacitance of each individual electrode while maintaining the overall touch sensing functionality across the display panel.
2Area of stationary object
If screen size is enlarged, then display area increases, but parasitic capacitance increases further causing decreased touch sensing accuracy
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes (first touch electrode and second touch electrode) that are disposed at different positions within the pixel. This segmentation reduces the parasitic capacitance of each individual electrode while maintaining the overall touch sensing functionality across the display panel.
3Device complexity
If common electrode is used as touch electrode, then device complexity is reduced, but parasitic capacitance increases due to intersection of driving and receiving electrode lines
Solution Approach 1:
The touch electrode is divided into multiple sub-electrodes (first touch electrode and second touch electrode) that are disposed at different positions within the pixel. This segmentation reduces the parasitic capacitance of each individual electrode while maintaining the overall touch sensing functionality across the display panel.
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 approach reduces parasitic capacitance, thereby improving touch sensing accuracy and enabling larger display panel sizes without compromising touch input detection quality.
Implementation Method 1
A capacitance deviation occurs between a touched touch electrode and an untouched touch electrode, and the touch sensing IC senses the capacitance deviation between the touch electrodes to detect whether there is a touch and a touched position.
Data Source
AI summary
Discussed is a display device integrated with touch screen. The display device includes a plurality of touch groups into which a plurality of touch electrodes are physically divided, a plurality of first driving electrode lines connected to a plurality of driving electrodes of a first touch group of the touch groups, a plurality of second driving electrode lines connected to a plurality of driving electrodes of a second touch group of the touch groups, a plurality of first receiving electrode lines connected to a plurality of receiving electrodes of the first touch group, a plurality of second receiving electrode lines connected to a plurality of receiving electrodes of the second touch group, a touch driving IC configured to supply a touch driving signal to the first and second driving electrode lines, and a touch sensing IC configured to sense touch signals of the first and second receiving electrode lines.