Touch Display Panel Layout for Capacitance-Uniform Sensing
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Solution Overview
Problem
In non-square touch display devices, a difference in capacitance between touch electrodes in non-square and square areas leads to touch performance degradation.
Innovation Solution
Compensate for the capacitance difference by varying the overlapping areas between touch driving and sensing lines, adjusting their widths, and incorporating a printed circuit board for compensation, particularly in non-square display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-square display panel structure is used to provide diverse display forms, then adaptability and versatility are improved, but capacitance uniformity deteriorates due to varying overlapping areas between touch lines
Solution Approach 1:
The patent applies local quality by differentiating the overlapping areas between touch driving lines and touch sensing lines based on their specific positions. Touch electrodes in non-square areas are assigned different overlapping areas compared to those in square areas, allowing each region to have optimized capacitance characteristics tailored to its geometric properties, thereby compensating for the non-uniformity introduced by the non-square display panel shape.
2Adaptability or versatility
If touch electrodes are arranged in non-square areas with varying geometries, then adaptability is improved, but touch sensing precision deteriorates due to capacitance differences
Solution Approach 1:
The patent employs parameter changes by systematically varying the overlapping areas between touch driving lines and touch sensing lines according to the position of touch electrodes. This parameter adjustment compensates for capacitance differences arising from non-square geometries, ensuring that touch sensing accuracy is maintained across all regions of the display panel regardless of shape variations.
3Device complexity
If uniform overlapping areas are used for all touch lines, then device complexity is reduced, but touch performance deteriorates in non-square areas due to capacitance imbalance
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through position-dependent overlapping area design. Instead of applying a uniform overlapping area to all touch lines, the design specifies different overlapping areas for touch lines based on whether they are located in square or non-square areas of the display panel. This localized differentiation maintains touch performance consistency across diverse geometries while adding only minimal complexity to the overall configuration.
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
Reduces touch noise and improves touch sensing performance by equalizing capacitance across different areas, enhancing overall touch sensitivity and accuracy.
Implementation Method 1
a difference in capacitance formed between a touch electrode located in a non-square area and a touch electrode located in a square area occurs
Implementation Method 2
overlapping areas in which at least some of the plurality of X-touch lines overlap at least some of the plurality of Y-touch lines are different
Data Source
AI summary
Disclosed herein is a touch display device and a display panel. The touch display device includes a display panel in which a plurality of X-touch electrode lines, which extend in a first direction and receive a touch driving signal through a plurality of X-touch lines, and a plurality of Y-touch electrode lines, which extend in a second direction and transmit a touch sensing signal through a plurality of Y-touch lines, are disposed, and a touch driving circuit configured to supply the touch driving signal to the plurality of X-touch electrode lines and receive the touch sensing signal from the Y-touch electrode line to sense a touch, wherein overlapping areas in which at least some of the plurality of X-touch lines overlap at least some of the plurality of Y-touch lines are different.