Grid Cathode Display Substrate for Touch Signal Shielding
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Solution Overview
Problem
In capacitive touch-control display screens, the proximity of touch-control electrodes to back panel driving circuits leads to signal interference and attenuation, especially during row inversion patterns, resulting in poor touch-control performance due to increased load and decreased signal sensing.
Innovation Solution
A display substrate with a grid-shaped cathode layer, where first and second cathode patterns overlap with signal lines, reducing mutual interference and signal attenuation by acting as a shielding layer, and a touch-control layer with electrodes arranged in a grid to minimize parasitic capacitance and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the touch-control display screen is thinned to reduce overall thickness, then the compactness and portability are improved, but the distance between the touch-control electrode and the back panel driving circuit decreases, causing increased signal interference and attenuation
Solution Approach 1:
A grid-shaped cathode layer is introduced as an intermediary component between the touch-control electrode and the back panel driving circuit. This cathode layer includes multiple cathode patterns arranged in a grid configuration that serves as a shielding structure, blocking electromagnetic interference from the driving circuit while maintaining the thinned display structure.
Solution Approach 2:
The cathode layer is segmented into multiple discrete cathode patterns arranged in a grid, rather than using a continuous cathode structure. This segmentation reduces the overall parasitic capacitance and interference while maintaining effective shielding coverage across the display area.
2Volume of moving object
If the distance between the touch-control electrode and the cathode is reduced to accommodate thinner display design, then the overall thickness is reduced, but the load on the touch-control electrode increases, resulting in signal attenuation and decreased sensing capability
Solution Approach 1:
The cathode is divided into multiple discrete cathode patterns in a grid arrangement, which reduces the total parasitic capacitance compared to a continuous cathode structure. This segmentation maintains adequate shielding while reducing the capacitive load on touch-control electrodes, preserving signal strength and sensing capability in thinned display designs.
3Object-affected harmful factors
If a traditional continuous cathode structure is used to provide complete coverage over pixel openings, then the shielding effect is improved, but the parasitic capacitance and load on touch-control electrodes increase, causing signal attenuation
Solution Approach 1:
The continuous cathode structure is replaced with a grid of discrete cathode patterns. This segmentation provides distributed shielding coverage across the display area while significantly reducing the total parasitic capacitance, thereby maintaining signal strength and touch-control performance.
Solution Approach 2:
Instead of using a uniform continuous cathode, the cathode is localized into specific grid patterns positioned to provide shielding where needed. The grid configuration optimizes the balance between local shielding effectiveness and overall parasitic capacitance reduction.
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
Improves touch-control signal-to-noise ratio and display performance by reducing interference and signal distortion, without the need for additional shielding layers or algorithmic scanning, enhancing touch-control performance and display quality.
Implementation Method 1
a grid-shaped cathode layer, where the cathode layer includes a plurality of first cathode patterns and a plurality of second cathode patterns... an orthographic projection of the second cathode pattern onto the base substrate at least partially overlaps with an orthographic projection of at least part of the plurality of signal lines onto the base substrate
Data Source
AI summary
A display substrate and a touch-control display device are disclosed. The display substrate comprises pixel units arranged in an array on a base substrate, signal lines, and a grid-shaped cathode layer; a sub-pixel in the pixel unit comprises a pixel opening area; the cathode layer comprises first cathode patterns and a second cathode patterns, the first cathode patterns are arranged in an array, and adjacent first cathode patterns are coupled via at least one second cathode pattern; an orthographic projection of the first cathode pattern onto the base substrate covers each pixel opening area in a corresponding pixel unit; an orthographic projection of the second cathode pattern onto the base substrate at least partially overlaps with an orthographic projection of at least part of the signal lines onto the base substrate.