Capacitive touch screen

Abstract

An embodiment of the invention discloses a capacitive touch screen. The capacitive touch screen comprises a substrate, a plurality of induction electrodes arranged on the substrate and a touch control chip bound to the substrate, wherein the plurality of induction electrodes are arranged to form a two-dimension array. The touch control chip is connected with every induction electrode respectively through wires. The touch control chip is arranged to utilize a detection circuit with test precision adjustable to detect self capacitance variation quantity of every induction electrode, and accordingly touch information is determined. According to the capacitive touch screen, multi-point touch can be achieved genuinely, and touch positions of different touch objects can be detected accurately.

Description

technical field [0001] Embodiments of the present invention relate to the field of touch technology, in particular to a capacitive touch screen. Background technique [0002] At present, capacitive touch screens are widely used in various electronic products, and have gradually penetrated into various fields of people's work and life. More and more capacitive touch screens begin to support passive pen and hand touch operations, but the amount of change in mutual capacitance caused by the touch of the hand and the passive pen is different, and the amount of change in mutual capacitance caused by the touch of the hand is relatively large Generally, the detection of the touch position of the hand is realized by the principle of mutual capacitance; because the passive pen has a relatively small touch area, it is often not enough to cause a sufficient change in mutual capacitance. Therefore, the touch detection of the passive pen is generally used The principle of self-capacitan...

AI Technical Summary

Problems solved by technology

More and more capacitive touch screens begin to support passive pen and hand touch operations, but the amount of change in mutual capacitance caused by the touch of the hand and the passive pen is different, and the amount of change in mutual capacitance caused by the touch of the hand is relatively large Generally, the detection of the touch position of the hand is realized by the principle of mutual capacitance; because the passive pen has a relatively small touch area, it is often not enough to cause a sufficient change in mutual capacitance. Therefore, the touch detection of the passive pen is generally used The principle of self-capacitance is realized, but when multiple passive pens are used for touch operation at the same time, ghost points often appear on the detection screen using the self-capacitance principle. Therefore, the self-capacitance touch screen cannot realize real multi-touch.

[0003] That is to say, the existing capacitive touch screen is limited by the structural problems of the screen itself. If the mutual capacitance principle is used to detect the touch, the touch position of the passive pen will not be accurately detected. If the self-capacitance principle is used to detect the touch, it will not be realized. True multi-touch, so it is necessary to provide a new capacitive touch screen to solve the above problems

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