Touch Substrate Floating Electrodes for Lower Coupling Capacitance
Find Innovative SolutionsGenerate Solutions
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 overlapping the touch electrode in the thickness direction, reducing the overlap area and coupling capacitance, and incorporating bridging electrodes and floating electrodes to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch electrode and display electrode are arranged with large overlap area, then the capacitive coupling is strong, but the signal-to-noise ratio deteriorates due to high coupling capacitance
Solution Approach 1:
A floating electrode layer is introduced between the touch electrode and display electrode as an intermediary element. This floating electrode is electrically isolated (not connected to any potential) and serves to reduce the direct capacitive coupling between the touch and display electrodes, thereby improving signal-to-noise ratio while maintaining necessary electrical isolation
Solution Approach 2:
The electrode structure is segmented into multiple independent components: touch electrode, floating electrode (divided into multiple floating electrode regions), and display electrode. The floating electrode regions are arranged in a grid pattern with spacing, creating multiple small capacitive couplings instead of one large coupling, which reduces overall interference
2Device complexity
If the overlap area between touch electrode and display electrode is reduced, then coupling capacitance is reduced, but the touch sensitivity may be affected
Solution Approach 1:
The floating electrode regions are selectively positioned in areas where they can reduce capacitive coupling without interfering with touch detection zones. The grid pattern of floating electrodes creates local variations in the electric field that reduce overall coupling while preserving touch sensitivity in critical areas
Solution Approach 2:
The floating electrode structure adds a third dimension (vertical layering) to the electrode arrangement. By stacking the floating electrode between the touch and display electrodes in the thickness direction, the solution reduces coupling capacitance through spatial separation rather than reducing the planar overlap area, thus maintaining touch sensitivity
3Reliability
If floating electrodes are added to reduce coupling capacitance, then signal-to-noise ratio is improved, but the device structure becomes more complex
Solution Approach 1:
The floating electrode is integrated into the existing multi-layer electrode structure of the display device. It is formed as an additional layer between the touch and display electrodes, utilizing the same fabrication processes and material systems, thus adding functionality without significantly increasing overall structural complexity
Solution Approach 2:
The floating electrode layer serves multiple functions: it reduces capacitive coupling between touch and display electrodes, acts as an additional insulating barrier, and can be configured in various patterns (grid, spaced regions) to optimize performance for different display and touch requirements
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
Improves signal-to-noise ratio and reduces loads on 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.