In-cell Touch Display Electrode Segmentation for Capacitance
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Solution Overview
Problem
In-cell touch display panels have relatively low mutual capacitance between touch driving and sensing electrodes, resulting in low touch sensitivity.
Innovation Solution
The implementation of a common electrode layer with alternately disposed first and second touch driving electrodes, where the second touch driving electrodes are arranged side by side and touch sensing electrodes project onto gaps between these electrodes, increasing the area and reducing distance between electrodes to enhance mutual capacitance and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch sensing electrodes are positioned on the color filter substrate in conventional in-cell touch display panels, then the overall thickness and production costs are reduced, but the mutual capacitance between touch sensing electrodes and touch driving electrodes is insufficient, resulting in low touch sensitivity
Solution Approach 1:
The touch driving electrodes are segmented into first touch driving electrodes and second touch driving electrodes that are disposed alternately with the first touch driving electrodes. The second touch driving electrodes are further divided into multiple second touch driving sub-electrodes arranged side by side. This segmentation increases the total electrode area and creates multiple capacitance pathways, thereby enhancing mutual capacitance and touch sensitivity without significantly increasing device complexity
Solution Approach 2:
The patent utilizes the gap regions between adjacent second touch driving sub-electrodes in the second direction (Y-direction) to position the touch sensing electrodes. By projecting the touch sensing electrodes onto these gaps, the design effectively uses the spatial dimension between electrodes to maximize capacitance coupling area without increasing the overall panel thickness or complicating the layered structure
2Reliability
If the area between touch driving electrodes and touch sensing electrodes is increased to enhance mutual capacitance, then touch sensitivity improves, but the aperture ratio of the display panel may be affected
Solution Approach 1:
The touch sensing electrodes are specifically positioned to correspond to the black matrix regions of the display panel, where they do not affect the aperture ratio. The alternating arrangement of first and second touch driving electrodes creates localized capacitance enhancement zones without requiring additional space that would reduce the display area. This local optimization allows capacitance enhancement while maintaining the aperture ratio
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 increases fringing mutual capacitance, thereby enhancing touch sensitivity and providing a better user experience without affecting the aperture ratio of the display panel.
Implementation Method 1
This configuration increases fringing mutual capacitance, thereby enhancing touch sensitivity
Data Source
AI summary
An in-cell touch display panel, a driving method thereof and a display device are provided. The display panel includes a common electrode layer and a plurality of touch sensing electrodes. The common electrode layer comprises a plurality of first touch driving electrodes and a plurality of second touch driving electrodes that are configured for loading of common electrode signals in a display period and for loading of touch signals in a touch period. The second touch driving electrodes include a plurality of second touch driving sub-electrodes. Projections of the touch sensing electrodes on an array substrate are at gaps of the second touch driving sub-electrodes that are adjacent within the second touch driving electrodes. With this display panel, the touch sensitivity can be enhanced.