Touch Display Panel Balancing Coupling Capacitance
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Solution Overview
Problem
Signal interference caused by shift registers in touch display panels leads to fluctuations in coupling capacitance, affecting touch accuracy.
Innovation Solution
The touch display panel design balances coupling capacitance by arranging first and second touch electrodes in specific directions and overlapping regions, ensuring a ratio between capacitances near and far from the non-display area falls within 0.9 to 1.1, and forming overlapping regions with varying areas to uniformize capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If shift registers are placed in the non-display area for signal transmission, then device functionality is improved, but coupling capacitance fluctuation increases affecting touch accuracy
Solution Approach 1:
The patent applies local quality by making touch electrode areas non-uniform across the display panel. Specifically, touch electrodes in different regions (edge vs. center) have different areas to compensate for the coupling capacitance interference caused by shift registers. This localized adjustment ensures that coupling capacitance remains consistent across all regions, thereby maintaining touch accuracy throughout the panel while preserving the functionality of the shift registers in the non-display area.
2Ease of operation
If touch electrodes are arranged in display area, then touch functionality is provided, but signal interference from non-display area components causes coupling capacitance fluctuation
Solution Approach 1:
The patent implements local quality by varying the area of touch electrodes based on their position relative to the non-display area. Touch electrodes closer to the non-display area (where shift registers are located) have different areas compared to those in the center of the display area. This localized differentiation compensates for the signal interference and coupling capacitance fluctuation caused by the non-display area components, ensuring uniform touch performance across the entire display panel.
3Ease of manufacture
If uniform touch electrode arrangement is used across display panel, then manufacturing simplicity is maintained, but coupling capacitance varies in different regions affecting touch consistency
Solution Approach 1:
The patent applies local quality by designing touch electrodes with non-uniform areas tailored to specific regions of the display panel. Rather than using a uniform electrode design across the entire panel, the invention adjusts electrode areas locally to compensate for regional variations in coupling capacitance caused by the proximity to shift registers. This approach achieves coupling capacitance uniformity across the panel while maintaining reasonable manufacturing simplicity through a systematic design rule.
Solution Approach 2:
The patent employs parameter changes by modifying the area parameter of touch electrodes based on their position. Specifically, the electrode area is adjusted as a variable parameter to compensate for positional differences in coupling capacitance. This parameter adjustment ensures that despite the non-uniform arrangement, the effective coupling capacitance experienced by each touch electrode remains consistent, thereby achieving touch consistency across the entire 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 design improves touch accuracy by balancing coupling capacitance and reducing signal interference, ensuring consistent touch performance across the display panel.
Implementation Method 1
a ratio between a coupling capacitance formed in a direction perpendicular to the array substrate between the first touch electrodes and the second touch electrodes positioned in the display area close to the non-display area to that formed in the direction perpendicular to the array substrate between the first touch electrodes and the second touch electrodes positioned in the display area far from the non-display area falls in between 0.9 and 1.1
Data Source
AI summary
A touch display panel is provided with a display area and a non-display area surrounding the display area. It includes an array substrate and a color film substrate arranged opposite to each other. The array substrate includes, in the display area, multiple first touch electrodes extending along a first direction and arranged in sequence along a second direction. The color film substrate includes, in the display area, multiple second touch electrodes extending along the second direction and arranged in sequence along the first direction. A ratio of a coupling capacitance in a direction perpendicular to the array substrate between the first touch electrodes and the second touch electrodes positioned in the display area close to the non-display area to that between the first touch electrodes and the second touch electrodes positioned in the display area far from the non-display area falls in between 0.9 and 1.1.