A signal processing method of an active pen, an active pen and a touch control screen

Abstract

The invention provides a signal processing method of an active pen, an active pen and a touch control screen. The method comprises the steps of performing undersampling on received excitation signals of an active pen by using a preset sampling rate, acquiring digital signals of the excitation signals of the active pen, and demodulating the digital signals of the excitation signals of the active pen to obtain demodulation signals; calculating touch control coordinates according to the amplitudes and the phase positions of the demodulation signals and outputting the touch control coordinates. The method can improve the signal processing precision of active pens and increase a signal to noise ratio.

Description

Technical field [0001] This application relates to the field of touch sensing technology, and in particular to a signal processing method of an active pen, an active pen, and a touch screen. Background technique [0002] With the development of touch technology and mobile terminal technology, more and more mobile terminals adopt touch methods for human-computer interaction. At present, the touch screens used in mobile terminals mainly include capacitive touch screens and resistive touch screens. Among them, capacitive touch screens have gained more and more attention with their good clarity, light transmittance and tactility. The favor of users. The most widely used mobile terminals are mobile phones and tablet computers. [0003] In addition to direct touch operations with fingers, capacitive touch screens can also use active pens instead of fingers for touch input operations. The principle of the active pen is that the capacitive touch screen receives the signal sent by the ac...

AI Technical Summary

Problems solved by technology

Since the coupling capacitor has an open electric field, it is easy to couple in interference signals, such as display screen interference signals, charger common mode interference signals, etc. Such interference signals will cause the signal-to-noise ratio (SNR) of the capacitive touch screen to decrease, Reduced touch accuracy and reduced user experience

When the interference signal is serious, the capacitive touch screen cannot correctly recognize the signal sent by other active pens such as the stylus, and there will be popping or jumping.

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