Capacitive Touch Panel Signaling for EMI-Resistant Control
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Solution Overview
Problem
Capacitive touch panels are particularly susceptible to electromagnetic interference (EMI) from sources like radio frequency signals and power lines, which negatively impact their performance.
Innovation Solution
A touch control system utilizing a non-tapered continuous wave signal, generated by a non-tapered continuous wave generator, is employed to transmit signals through a capacitive touch panel, reducing EMI effects by minimizing bandwidth and enhancing immunity to electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tapered wave signals are used for touch panel transmission, then the signal can be transmitted effectively, but the system is susceptible to electromagnetic interference (EMI) from radio frequency signals and power lines
Solution Approach 1:
The patent changes the signal parameters by using non-tapered continuous wave signals instead of conventional tapered wave signals. This parameter change reduces the bandwidth of the transmitted signal, thereby minimizing the frequency range over which electromagnetic interference can affect the touch panel system, improving immunity to EMI from radio frequency signals and power lines
2Reliability
If broader bandwidth signals are used for touch panel transmission, then signal transmission coverage is improved, but spectral interference from electromagnetic sources increases
Solution Approach 1:
The patent modifies the signal bandwidth parameter by employing non-tapered continuous wave signals with reduced bandwidth compared to conventional signals. This parameter optimization maintains effective signal transmission for touch panel operation while minimizing spectral interference with radio frequency signals and other electromagnetic sources
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 non-tapered continuous wave signal effectively mitigates electromagnetic interference, improving the reliability and performance of capacitive touch panels by reducing spectral interference and enhancing signal integrity.
Implementation Method 1
The non-tapered continuous wave generator generates a non-tapered continuous wave signal as a transmit signal for the transmitter
Data Source
Figure 1
Figure 2A~2C
Figure 3A
AI summary
A touch control system includes a touch panel composed of a plurality of transmit lines and a plurality of receive lines; a transmitter that transmits at least one transmit signal to corresponding transmit line; a receiver that receives at least one receive signal from corresponding receive line; and a non-tapered continuous wave generator that generates a non-tapered continuous wave signal as a transmit signal for the transmitter.