Multi-Frequency Touch Control for Water Interference
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Solution Overview
Problem
Capacitive touch technology is adversely affected by water droplets, making it difficult to distinguish between finger touches and water-induced capacitance changes, leading to reduced accuracy and functionality in wet or water-exposed environments.
Innovation Solution
A touch control method using multi-frequency or single-frequency non-sine wave scanning signals to differentiate between finger and water-induced capacitance changes by acquiring and calculating touch data, allowing for accurate determination of touch positions even in wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch technology is used, then touch sensitivity is improved, but waterproof performance deteriorates because water droplets cause false touch signals
Solution Approach 1:
The scanning signal is divided into multiple frequency components (first frequency and second frequency). By segmenting the signal frequency spectrum, the system can analyze different frequency responses to distinguish between finger touches and water droplets, thereby maintaining touch sensitivity while improving waterproof performance.
Solution Approach 2:
The system changes the frequency parameter of the scanning signal to differentiate between touch types. Finger touches and water droplets affect different frequency components differently, so by adjusting and comparing responses at multiple frequencies, the system can identify genuine touches while rejecting water-induced false signals.
2Reliability
If multi-frequency scanning signals are used to distinguish finger touches from water droplets, then waterproof performance is improved, but device complexity increases
Solution Approach 1:
The system uses periodic scanning signals at different frequencies to excite the touch electrodes. By periodically applying multi-frequency signals and analyzing the periodic responses, the system can distinguish touch types through frequency-domain analysis without requiring overly complex processing circuits.
Solution Approach 2:
The patent replaces complex hardware differentiation mechanisms with signal processing methods. Instead of using different physical structures to distinguish finger touches from water droplets, the system uses multi-frequency electrical signaling and computational analysis to achieve the same discrimination function with simpler hardware.
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
Enhances the waterproof and moisture-proof capabilities of touch devices, ensuring the touch function operates effectively in wet or water-existing scenarios by distinguishing between finger and water-induced capacitance changes.
Implementation Method 1
capacitive touch principle (that is, when a finger is placed on a touch area of a device, a capacitance value of the touch area close to the finger will change, wherein a touch position of the finger can be determined by detecting a position where the capacitance value changes)
Implementation Method 2
an electrical coupling is formed between the touch sensing electrode RX, the touch driving electrode TX, and the finger
Data Source
AI summary
A touch control method is provided. The touch control method is applied in a touch device including a plurality of touch electrodes, the touch control method includes: step S1, sending a scanning signal to the plurality of touch electrodes, the scanning signal being a multi-frequency scanning signal; step S2, acquiring touch data according to the multi-frequency scanning signal; and step S3, calculating a current touch position according to the touch data.