Touch Array Substrate Slot Design for Parasitic Capacitance Reduction
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Solution Overview
Problem
In liquid crystal display (LCD) touch array substrates, parasitic capacitance between touch sensing electrode lines and electrodes leads to increased load, affecting performance and requiring a reduction in surface area overlap to mitigate this issue.
Innovation Solution
The touch array substrate design incorporates a first slot in the touch sensing electrode, with its projection onto the substrate overlapping with the touch sensing electrode line projection, reducing the surface area overlap and thereby decreasing parasitic capacitance and load between the electrodes.
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 size is reduced, but the parasitic capacitance between them increases leading to increased load
Solution Approach 1:
The touch sensing electrode is segmented by introducing a first slot that divides the electrode into separate regions. This segmentation reduces the overlapping area between the electrode and the electrode line, thereby decreasing parasitic capacitance while maintaining compact device dimensions
Solution Approach 2:
The slot is designed to extend in a direction different from the extending direction of the electrode line, creating a dimensional separation that reduces overlap area without increasing overall device footprint, effectively managing parasitic capacitance in a compact layout
2Object-generated harmful factors
If the overlap area between touch sensing electrode line and touch sensing electrode is reduced to decrease parasitic capacitance, then the load is reduced, but the effective sensing area may be compromised
Solution Approach 1:
The slot segments the touch sensing electrode to reduce overlap with the electrode line, decreasing parasitic capacitance while the remaining electrode portions maintain sufficient sensing area for effective touch detection
Solution Approach 2:
The slot is positioned and sized to specifically reduce overlap in regions where parasitic capacitance is problematic, while preserving the electrode structure in regions critical for sensing functionality, achieving localized optimization
Data Source
AI summary
A touch array substrate, a liquid crystal display panel and a liquid crystal display device. The touch array substrate includes: a substrate; a touch sensing electrode layer including a plurality of touch sensing electrodes insulated from each other, each of which is electrically connected with one touch sensing electrode line; where, the touch sensing electrode includes a first slot, and a first region, which represents a projection of the first slot onto the substrate in a direction perpendicular to the substrate and is at least partially overlapped with a second region which represents a projection of the touch sensing electrode line onto the substrate in the direction perpendicular to the substrate.