In-Cell Touch Screen Electrode Segmentation for Signal Interference
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Solution Overview
Problem
In Full In-Cell (FIC) capacitive touch screens, the touch electrode structure is susceptible to signal interference from gate lines and data lines, leading to false touch point reports due to its integration between the array substrate and color filter, without considering the patterning of gate and data lines during touch electrode formation.
Innovation Solution
The touch electrodes are arranged with capacitive electrode blocks corresponding to sub-pixel units and linear capacitive electrodes positioned between rows, insulated from gate and data lines, ensuring their orthographic projections fall within sub-pixel units, reducing signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the touch electrode structure is integrated between the array substrate and color filter in the same layer, then the structure becomes simple and cost-effective, but the touch electrode becomes susceptible to signal interference from gate lines and data lines causing false touch points
Solution Approach 1:
The touch electrode is divided into multiple segments (first touch electrode segments and second touch electrode segments) that are arranged in different layers. The first segments are in the same layer as gate lines and data lines, while the second segments are in a different layer, creating a segmented structure that reduces signal interference while maintaining manufacturing simplicity
Solution Approach 2:
The invention transitions from a two-dimensional single-layer electrode design to a three-dimensional multi-layer design. By stacking touch electrode segments across different layers (Z-dimension), the patent creates spatial separation between touch electrodes and signal lines, reducing interference without complicating the manufacturing process
2Ease of manufacture
If the orthographic projection of the touch electrode covers the data lines on the array substrate, then the manufacturing process is simplified, but false touch point reports occur due to signal interference
Solution Approach 1:
The touch electrode is segmented into first and second touch electrode segments positioned in different layers. This segmentation allows the electrode to maintain simple patterning in the first layer while the second layer segments provide spatial separation from data lines, preserving both manufacturing simplicity and touch detection accuracy
Solution Approach 2:
By extending the touch electrode structure into the third dimension (different layers), the patent achieves spatial separation between the electrode and data lines without complicating the in-plane patterning process. The multi-layer arrangement reduces interference while maintaining simple manufacturing
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 effectively reduces signal interference from gate and data lines, minimizing false touch point reports and enhancing the accuracy and yield of FIC capacitive touch screens.
Implementation Method 1
the linear capacitive electrode is insulated from the gate line and/or the data line
Implementation Method 2
the first capacitive electrodes comprises a plurality of electrically connected capacitive electrode blocks
Data Source
AI summary
The present invention provides an In-Cell touch screen and a display device, which belongs to the field of touch display technology. The FIC capacitive touch screen comprises an array substrate and touch electrodes disposed above or below the array substrate, the touch electrodes comprising a plurality of first capacitive electrodes and a plurality of second capacitive electrodes, wherein the first capacitive electrode comprises a plurality of electrically connected capacitive electrode blocks correspondingly located in areas where at least a portion of sub-pixel units of the array substrate are located. The FIC capacitive touch screen has fewer reports for false touch point.