Touch Panel Grounded Electrode Shielding Against Capacitive Crosstalk
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Solution Overview
Problem
Existing touch screens face issues with telecommunication coupling crosstalk between touch structures and vibrator structures, leading to incorrect touch position detection due to capacitive coupling, which affects the functionality and accuracy of touch operations.
Innovation Solution
A touch panel design incorporating a grounded first electrode layer between the touch structure and tactile sensor, along with a tactile sensor that generates a standing wave for tactile reproduction, and a layered structure with insulating and connection layers to prevent capacitive coupling, ensuring the touch structure is not affected by drive signals from the tactile sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch structure and vibrator structure are integrated in a touch panel, then tactile reproduction function is achieved, but telecommunication coupling crosstalk occurs between the structures
Solution Approach 1:
A first electrode layer is introduced as an intermediary component between the touch structure and the tactile sensor. This electrode layer acts as a shielding layer that blocks the capacitive coupling path between the touch structure and the vibrator structure, thereby eliminating telecommunication coupling crosstalk while allowing both structures to coexist in the integrated touch panel
2Device complexity
If the touch structure and tactile sensor are placed close together for integration, then device complexity is reduced, but capacitive coupling causes incorrect touch detection
Solution Approach 1:
The first electrode layer serves as a shielding intermediary positioned between the touch structure and tactile sensor, enabling close integration of components while preventing capacitive coupling interference. This maintains measurement precision by blocking the coupling path despite the close proximity of structures
Solution Approach 2:
The touch panel is segmented into distinct functional layers with the first electrode layer acting as a separate shielding component. This segmentation allows the touch structure and tactile sensor to be integrated closely while the intermediate electrode layer maintains electrical isolation and prevents crosstalk
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 effectively isolates drive signals, enhancing touch accuracy and ensuring correct touch position detection by shielding capacitive coupling, thereby improving the overall touch experience.
Implementation Method 1
a tactile sensor stacked with the touch structure and configured to generate a standing wave on a surface of the touch panel during operation to realize tactile reproduction
Implementation Method 2
Existing touch screens face issues with telecommunication coupling crosstalk between touch structures and vibrator structures, leading to incorrect touch position detection due to capacitive coupling
Data Source
AI summary
Embodiments of the disclosure provide a touch panel and a touch device. The touch panel includes: a touch structure; a tactile sensor stacked with the touch structure and configured to generate a standing wave on a surface of the touch panel during operation to realize tactile reproduction; and a first electrode layer located between the touch structure and the tactile sensor, where the first electrode layer is insulated from the tactile sensor and the touch structure, and the first electrode layer is grounded; and a base substrate located between the touch structure and the tactile sensor.