Method for detecting active pen, touch control chip, touch screen, and touch control devices

Abstract

A method for detecting active pen, touch control chip, touch screen, and touch control devices. the method for detecting active pen includes: Based on the detection signals output by multiple AFE circuits during the first scan time, the detection data frame is obtained; When the previous detection data frame indicates the presence of an active pen on the touchscreen, enter pen detection mode; In pen detection mode, the touchscreen scans the detection signals from all transmitter and receiver electrodes according to the second scanning time; Extract the pen data of the active pen from the current detection data frame; Demodulate the pen data to obtain the signal amplitude corresponding to the signal frequency of the active pen; Determine the contact status, contact point position, or tilt angle of the active pen based on signal amplitude.

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