Touch Substrate Floating Electrode Layout for Higher SNR
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Solution Overview
Problem
Existing touch substrates suffer from poor signal-to-noise ratio due to high coupling capacitance between touch and display electrodes.
Innovation Solution
A touch substrate design with a first floating electrode that partially overlaps with the touch electrode in the thickness direction, reducing the overlap area and coupling capacitance, and includes bridging electrodes and floating electrodes to further minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the touch electrode and display electrode are placed close to each other to achieve a compact structure, then the device size is reduced, but the coupling capacitance between the electrodes increases, leading to poor signal-to-noise ratio
Solution Approach 1:
The touch substrate is divided into multiple layers with distinct functional regions. The touch electrode is segmented into finger electrode regions and body electrode regions, separated by insulating layers. This segmentation allows the electrodes to be positioned close together while maintaining electrical isolation, thus reducing coupling capacitance and improving signal-to-noise ratio without increasing device size.
Solution Approach 2:
The patent introduces a vertical stacking arrangement where the touch electrode and display electrode are positioned in different layers separated by insulating layers. This three-dimensional arrangement allows the electrodes to be close in the planar dimension while maintaining sufficient separation in the vertical dimension, effectively reducing coupling capacitance while keeping the device compact.
2Measurement precision
If the overlap area between touch electrode and display electrode is increased to improve touch sensitivity, then the touch response becomes more sensitive, but the coupling capacitance increases, deteriorating the signal-to-noise ratio
Solution Approach 1:
Different regions of the touch electrode are assigned different functions: finger electrode regions for touch detection and body electrode regions for structural support and shielding. The finger electrodes have larger overlap areas with the display electrode to enhance touch sensitivity, while the body electrodes provide shielding to reduce coupling capacitance. This local differentiation allows simultaneous optimization of both touch sensitivity and signal-to-noise ratio.
3Reliability
If the coupling capacitance between touch electrode and display electrode is reduced to improve signal-to-noise ratio, then the signal quality improves, but the touch electrode and display electrode must be separated, increasing device thickness
Solution Approach 1:
The patent employs thin insulating films and flexible electrode structures to achieve effective electrode separation. The insulating layers are designed with optimized thickness to provide sufficient electrical isolation and reduce coupling capacitance, while remaining thin enough to maintain a compact overall device thickness. The flexible electrode designs allow for efficient signal transmission through minimal overlap areas.
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
The design improves the signal-to-noise ratio and reduces loads on both touch and display electrodes by minimizing coupling capacitance.
Implementation Method 1
reducing the overlap area and coupling capacitance
Data Source
AI summary
The present disclosure provides a touch substrate, a display panel and a display apparatus. The touch substrate includes: a touch insulating layer; a touch electrode, provided at a side of the touch insulating layer; and a first floating electrode, provided at a side of the touch insulating layer away from the touch electrode, where the first floating electrode and the touch electrode at least partially overlap in a thickness direction of the touch insulating layer. In the present disclosure, a signal-to-noise ratio can be improved.