Array Substrate Capacitor Layout for Higher Touch Precision
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Solution Overview
Problem
Touch panels in large-sized display panels face reduced touch sensitivity and precision due to complex electrode arrangements and interference between signal lines, leading to low aperture ratios and transmittance.
Innovation Solution
An array substrate design with a pixel unit comprising a main pixel area, subpixel area, and capacitor electrode, where the capacitor electrode is positioned in the subpixel area with a larger overlapping area than the main pixel electrode and common electrode, enhancing capacitance values and simplifying the layout to improve touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch signal lines are disposed at edge positions of main pixel areas and subpixel areas, then touch signal lines can be electrically connected to common electrodes, but the layout complexity increases and interference between different electrodes and signal lines occurs
Solution Approach 1:
The patent merges the functions of touch signal line transmission and electrode connection by integrating the touch signal line layout with the existing pixel electrode structure. The touch signal lines are routed through the pixel circuit areas rather than along the edges, combining multiple functions into a unified layout that reduces overall complexity while maintaining touch precision.
Solution Approach 2:
The patent changes the spatial arrangement of touch signal lines from a two-dimensional edge-based layout to a three-dimensional routing approach that utilizes the vertical stacking of pixel circuit layers. This allows touch signal lines to pass through different layers and areas, reducing planar complexity and minimizing interference with other signal lines.
2Reliability
If touch signal lines are disposed at edge positions of pixel areas, then connection to common electrodes is achieved, but interference between different electrodes and signal lines occurs
Solution Approach 1:
The patent extracts the touch signal line routing from the edge positions where interference occurs and relocates them through the pixel circuit areas. This separation removes the harmful interference effect while maintaining the essential connection function, effectively taking out the problematic element from its harmful context.
Solution Approach 2:
The patent uses the pixel circuit areas as an intermediary space for routing touch signal lines. Instead of allowing direct contact between touch signal lines and other electrodes at edge positions, the pixel circuit structure serves as a mediating layer that routes signals through a controlled path, reducing direct interference while maintaining functional connectivity.
3Area of stationary object
If touch areas are small in large-sized display panels, then aperture ratios of pixel units are low, but touch transmittance is reduced
Solution Approach 1:
The patent makes the pixel circuit areas serve multiple functions: they not only house the driving circuitry but also serve as transmission channels for touch signal lines. This multi-functionality allows the system to maintain small touch area apertures while still providing adequate touch signal transmission paths, thereby preserving both aperture ratio and touch sensitivity.
Solution Approach 2:
The patent addresses the aperture ratio versus touch sensitivity contradiction by moving touch signal transmission to a different dimensional space - utilizing the vertical stacking and layered structure of the pixel circuit areas rather than competing for horizontal space. This allows touch signals to pass through the pixel areas without reducing the visible 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
The design enhances touch sensitivity and precision by adjusting capacitance values and reducing interference, resulting in improved comprehensive performance of the touch display panel.
Implementation Method 1
a capacitance value of a storage capacitor corresponding to the subpixel electrode and the capacitor electrode is greater than a capacitance value of a storage capacitor corresponding to the main pixel electrode and the common electrode
Data Source
AI summary
An array substrate and a touch display panel are provided. The array substrate includes a substrate, a pixel unit, a pixel electrode, and a capacitor electrode. An orthographic projection of the capacitor electrode on the substrate at least partially overlaps an orthographic projection of a subpixel electrode on the substrate. By arranging the capacitor electrode in a subpixel area and by making a capacitance value of a storage capacitor corresponding to the subpixel electrode greater than a capacitance value of a storage capacitor corresponding to a main pixel electrode and a common electrode, touch effects of a display panel can be improved.