Touch Control Chip Floating Ground Driving Module
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Solution Overview
Problem
Traditional touch circuits have low detection sensitivity, making it difficult to support hovering touch functions due to their reliance on working voltage for touch detection.
Innovation Solution
The integration of a floating ground driving module in the touch circuit, which provides a floating ground signal to the capacitive sensing component, enhancing detection sensitivity and enabling hovering touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional touch circuit uses working voltage for touch detection, then the circuit structure is simple, but the detection sensitivity is low and hovering touch function is not supported
Solution Approach 1:
The patent introduces a floating ground driving module as an intermediary component between the power supply and the analog front end. This module generates a floating ground signal that serves as a reference for touch detection, enabling higher detection sensitivity without fundamentally redesigning the entire touch circuit architecture.
Solution Approach 2:
The patent changes the reference voltage parameter by introducing a floating ground signal that dynamically adjusts the reference potential. This parameter change enables the circuit to detect weaker touch signals including hovering touches, while maintaining compatibility with existing touch circuit designs.
2Adaptability or versatility
If floating ground driving module is added to improve detection sensitivity, then hovering touch function is supported, but the circuit complexity increases
Solution Approach 1:
The floating ground driving module is designed to serve multiple functions: it provides the floating ground reference for touch detection, maintains compatibility with existing touch circuits, and enables both traditional touch and hovering touch detection. This multi-functionality justifies the added complexity by delivering enhanced versatility.
3Measurement precision
If floating ground signal is used for excitation, then detection sensitivity is improved, but the energy consumption increases
Solution Approach 1:
The floating ground driving module operates by periodically switching the floating ground reference voltage between different levels. This periodic action enables effective touch signal detection through differential measurement while allowing the system to enter low-power states between switching cycles, balancing detection sensitivity with energy consumption.
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
This solution effectively improves the sensitivity of touch detection, allowing traditional touch circuits to support hovering touch functions by providing a stronger excitation signal, thereby enhancing user interaction experiences.
Implementation Method 1
a detection terminal of the analog front end is connected to a capacitive sensing component... the floating ground signal is used to enable the capacitive sensing component to generate a sensing signal
Data Source
AI summary
The present disclosure relates to the field of touch technology, and provides a touch control chip, an electronic device and a touch detection method. The touch control chip (1) includes: a processing unit (10), a floating ground driving module (11) and an analog front end (12); the floating ground driving module (11) is connected to the analog front end (12), a detection end of the analog front end (12) is connected to a capacitive sensing component (3), and an output end of the analog front end (12) is connected to the processing unit (10); the processing unit (10) is configured to control the floating ground driving module (11) to provide a floating ground signal to the analog front end (12), the floating ground signal is used to enable the capacitive sensing component (3) to generate a sensing signal, the processing unit (10) performs touch detection according to the sensing signal.