In-cell Touch Screen Electrode Segmentation for Display Interference
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Solution Overview
Problem
Current in-cell touch panels face challenges in minimizing the influence of touch sensing electrodes on image display quality due to their mesh-shaped structure, which affects the electric field and display performance.
Innovation Solution
The touch sensing electrodes are placed on the upper substrate in a laterally distributed configuration with parallel connections, while the touch driving electrodes are positioned longitudinally on the array substrate, allowing for a touch function that does not interfere with image display by applying voltage independently to these electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mesh-shaped touch sensing electrodes are used in in-cell touch panels, then touch functionality is achieved, but image display quality is degraded due to electric field interference
Solution Approach 1:
The touch sensing electrode is divided into multiple independent sub-electrodes (first sub-electrode and second sub-electrode) that are laterally distributed. Each sub-electrode can be independently controlled, allowing the touch sensing function to be maintained while reducing the overall electric field interference with the display image. The segmentation breaks up the continuous mesh structure that causes harmful electric field effects.
Solution Approach 2:
Different regions of the touch sensing electrode are given different properties through segmentation. The sub-electrodes are strategically positioned and sized to provide touch sensing capability in specific locations while minimizing interference with the display area. The lateral distribution of sub-electrodes creates localized electric fields that are less disruptive to the overall display image compared to a continuous mesh structure.
2Adaptability or versatility
If touch sensing electrodes are integrated into the display panel structure, then product competitiveness is enhanced, but display performance is affected by electrode placement
Solution Approach 1:
The touch sensing electrode structure is transitioned from a traditional mesh configuration to a laterally distributed sub-electrode arrangement. This dimensional reorganization allows the electrodes to be positioned in a way that separates touch sensing functions from display interference zones. The lateral distribution across the substrate enables optimized positioning that maintains product integration while preserving display quality.
3Speed
If longitudinally distributed touch driving electrodes are used, then touch response is improved, but image display is interfered with by electric field formation
Solution Approach 1:
The harmful electric field formation capability is extracted and separated from the touch driving electrode structure. By using laterally distributed sub-electrodes instead of a continuous longitudinal structure, the patent maintains the necessary touch response speed while removing the excessive electric field formation that causes display interference. The extraction of the mesh structure eliminates the harmful effect while preserving the useful touch function.
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 effectively reduces the impact of touch sensing electrodes on image display, enhancing the display performance by optimizing the placement and connection of electrodes, thereby improving the overall image quality without compromising touch functionality.
Implementation Method 1
The touch sensing electrode comprises a plurality of first sub-electrodes 100 located within a black matrix area and distributed longitudinally and a plurality of second sub-electrodes 110 located in the black matrix area and distributed laterally, and the second sub-electrodes 110 are in electrical connection with the first sub-electrodes 100
Data Source
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AI summary
Embodiments of the present invention provide an in-cell touch panel and a display device to decrease the influence of the touch driving electrode in the in-cell touch panel on image display. The in-cell touch panel comprises an upper substrate and a lower substrate opposite to each other, and comprises a plurality of touch sensing electrodes provided on the upper substrate and a plurality of touch driving electrodes provided on the lower substrate, wherein the touch sensing electrodes are laterally distributed, and the touch driving electrodes are longitudinally distributed; wherein the touch sensing electrodes comprise one or a plurality of touch sensing sub-electrodes which are parallel to each other and distributed laterally, and the plurality of touch sensing sub-electrodes are in parallel connection therebetween.