Active pen, control method and device thereof and handwriting display method and device

Abstract

The invention discloses an active pen, a control method and device thereof and a handwriting display method and device, and belongs to the technical field of touch control. The active pen includes a first electrode, a plurality of second electrodes, and a control circuit. One end of the first electrode is a nib of the main moving pen. The second electrodes are arranged around the first electrode at intervals in the circumferential direction, gaps are formed between the second electrodes and the first electrode, and a capacitor is formed between the first electrode and each second electrode. Inthe writing process of the active pen, due to the fact that the pen point is stressed, the first electrode deviates, and the gap between the first electrode and the second electrode is changed. The second electrodes are controlled to send excitation signals respectively, and the frequencies of the excitation signals sent by the second electrodes are different. The first electrode receives the excitation signals sent by the plurality of second electrodes to obtain induction signals. According to the induction signal, the capacitance between the first electrode and each second electrode is determined, so that the offset direction and offset of the first electrode are determined, and the stress information of the pen point is further determined.

Description

technical field [0001] The invention relates to the field of touch technology, in particular to an active pen, a control method and device thereof, and a handwriting display method and device. Background technique [0002] With the development of touch technology, large-size capacitive touch screens (also known as electronic whiteboards, IWB, Interactive White Board) are more and more widely used as display devices in conferences and education. The active pen is a common tool for realizing touch control on the capacitive touch screen. [0003] In order to present the stroke effect of the active pen writing handwriting, when the active pen recognizes the starting point or end point (that is, the dead point) of a certain line segment, artificially add a group of points corresponding to a smaller pressure value in the same direction ( That is, make up points). However, for strokes with corners, dots along the direction of the handwriting will be different from the real stroke...

AI Technical Summary

Problems solved by technology

However, for strokes with corners, dots along the handwriting direction will be different from the real strokes, causing errors in the display of handwriting strokes and affecting the writing experience

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