Touch Array Substrate with Segmented Electrodes for Parasitic Capacitance Reduction
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Solution Overview
Problem
In liquid crystal display (LCD) touch panels, parasitic capacitance between touch sensing electrode lines and electrodes leads to increased load, affecting performance and efficiency.
Innovation Solution
A touch array substrate design with strategically placed slots in the touch sensing electrodes and lines, reducing the overlapping area and thus parasitic capacitance, and reusing the common electrode as the touch sensing electrode to decrease thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the touch sensing electrode line and touch sensing electrode are placed close to each other for compact design, then the device structure is more compact, but the parasitic capacitance between them increases leading to increased load
Solution Approach 1:
The touch sensing electrode is divided into multiple segments with slots (first slot and second slot) created within it. This segmentation reduces the continuous overlapping area between the electrode and the electrode line, thereby reducing parasitic capacitance while maintaining the compact layout structure.
Solution Approach 2:
The patent applies different structural configurations to different regions of the touch sensing electrode. Specifically, the first slot is positioned to overlap with the electrode line projection to reduce parasitic capacitance in that local region, while the second slot is positioned to overlap with the virtual electrode line projection to maintain touch sensitivity in another region. This local differentiation resolves the contradiction between compactness and parasitic capacitance reduction.
2Reliability
If the overlapping area between touch sensing electrode line and electrode is increased to improve connection reliability, then the connection becomes more reliable, but the parasitic capacitance increases leading to increased load
Solution Approach 1:
The touch sensing electrode is segmented into multiple regions separated by slots. The first slot creates a controlled overlap region with the electrode line that maintains sufficient connection reliability, while the segmentation overall reduces the total parasitic capacitance by creating non-overlapping regions.
Solution Approach 2:
The slot structure acts as an intermediary element between the touch sensing electrode and the electrode line. It controls the interaction between these two components, allowing for controlled overlap that maintains reliability while minimizing parasitic capacitance through the non-overlapping regions created by the slot.
3Ease of manufacture
If the touch sensing electrode structure is simplified to reduce manufacturing complexity, then manufacturing becomes easier, but the ability to control parasitic capacitance and light transmittance consistency deteriorates
Solution Approach 1:
The touch sensing electrode is segmented with slots that can be formed using standard photolithography and etching processes. This segmentation approach maintains manufacturing simplicity while enabling precise control over the electrode geometry to achieve consistent light transmittance across different pixel units.
Solution Approach 2:
Different slot configurations (first slot and second slot with different positions and dimensions) are applied to different regions of the touch sensing electrode. This local differentiation allows for optimization of light transmittance consistency across various pixel units while maintaining overall manufacturing simplicity through a systematic design approach.
Data Source
AI summary
A touch array substrate includes a substrate and a touch sensing electrode layer including a plurality of touch sensing electrodes; a touch sensing electrode line layer includes a plurality of touch sensing electrode lines and a plurality of virtual touch sensing electrode lines; each of the touch sensing electrodes is electrically connected with at least one of the touch sensing electrode lines; at least one of the touch sensing electrodes includes a first slot and a second slot; a third region which represents a projection of the second slot on the substrate is separated from a projection of each of the touch sensing electrode lines, and the third region is at least partially overlapped with a projection of the respective one of the virtual touch sensing electrode lines on the substrate.