Touch Sub-Electrode Layout for Display Panel Parasitic Capacitance
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Solution Overview
Problem
The integration of touch electrodes in display panels often leads to coupling interference with signal lines, affecting the accuracy of both display and touch performance due to parasitic capacitance.
Innovation Solution
The arrangement of touch electrodes avoids overlapping with signal lines, utilizing inter-group and intra-group connecting parts to minimize overlapping areas and ensure electrical connectivity, thereby reducing parasitic capacitance and maintaining signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are added to the display panel to integrate touch function, then touch capability is improved, but coupling interference with signal lines increases due to parasitic capacitance
Solution Approach 1:
The touch electrode is divided into multiple touch sub-electrodes arranged in an array, where each sub-electrode is independently controlled to avoid overlap with signal lines. This segmentation reduces parasitic capacitance between the touch electrode and signal lines while maintaining overall touch functionality.
Solution Approach 2:
The patent utilizes the vertical dimension (z-direction) by arranging different components in stacked layers. The touch sub-electrodes are positioned in a different vertical layer from the signal lines, allowing horizontal overlap in the plane while preventing electrical coupling through vertical separation, thus reducing parasitic capacitance.
2Object-affected harmful factors
If touch sub-electrodes are arranged to avoid overlapping with signal lines, then parasitic capacitance is reduced, but the area available for touch electrodes is limited
Solution Approach 1:
The patent resolves the area limitation by utilizing the vertical dimension. Multiple touch sub-electrodes are arranged in the same planar region but at different vertical positions (z-direction), effectively increasing the functional touch area without increasing the planar footprint or causing interference with signal lines.
Solution Approach 2:
The touch sub-electrodes are nested within the display panel structure at different vertical layers, with the touch electrode layer positioned above or below the signal line layer. This nesting allows the touch electrodes to occupy the same planar space as signal lines without physical interference, maximizing the usable touch area.
3Object-affected harmful factors
If multiple touch sub-electrodes are used to reduce interference, then coupling interference is reduced, but the complexity of electrical connection increases
Solution Approach 1:
Multiple touch sub-electrodes that are adjacent to each other are electrically connected and controlled as a single unit. By merging the control of multiple sub-electrodes into one control signal, the system reduces the complexity of electrical connections while maintaining the interference-reduction benefits of having multiple segmented electrodes.
Solution Approach 2:
The touch sub-electrodes are designed to serve multiple functions: individual sub-electrodes can be independently controlled for precise touch detection, while groups of sub-electrodes can be merged for broader coverage areas. This multi-functionality allows the same structural elements to adapt to different operational requirements without increasing connection complexity.
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 arrangement enhances the accuracy of signals transmitted on both signal lines and touch electrodes, improving the overall performance of the display panel by reducing coupling interference and ensuring effective touch operations.
Implementation Method 1
each touch sub-electrode avoids the first signal line and the second signal line that is not electrically connected to the touch sub-electrode, such that the parasitic capacitance between the touch sub-electrode and the first signal line, as well as the parasitic capacitance between the touch sub-electrode and the second signal line transmitting a different signal are both reduced
Data Source
AI summary
Provided are a display panel and a display apparatus. The display panel includes first signal lines, second signal lines, and touch electrodes each including touch sub-electrode groups. Each touch sub-electrode group includes touch sub-electrode rows each including at least two touch sub-electrodes arranged along the first direction. Along a direction perpendicular to the display panel, each touch sub-electrode does not overlap the first signal lines and the second signal lines that are not electrically connected to the touch sub-electrodes. Each touch sub-electrode group further includes intra-group connecting parts each connecting two adjacent touch sub-electrodes. Four closet vertices of four adjacent touch sub-electrodes in the first direction and in the second direction form a smallest quadrilateral having an area of S0, and an orthographic projection of each intra-group connecting part on the plane of the display panel has an area of S1, where S1<S0.