Touch detection system and detection method thereof, touch screen terminal

Abstract

A touch detection system, a detection method thereof, and a touch screen terminal. The touch detection system has a 2-dimensional matrix touch sensor. Several driving electrodes (71) and several sensing electrodes (72) are arranged on the 2-dimensional matrix touch sensor. A coupling capacitance is formed between a driving electrode (71) and a sensing electrode (72), and a parasitic capacitance is formed between grounding and each of the driving electrode (71) and the sensing electrode (72). A touch control solution based on parasitic capacitor detection is very different from a conventional technology in terms of a detection principle, can make improvements for the problems in the prior art, and may not only adapt to simple design of touch screen electrodes and therefore reduce process requirements, but also may adapt to high electrode impedance on a touch screen and at the same time support multi-touch detection applications.

Description

technical field [0001] The invention belongs to the field of touch technology, and in particular relates to a touch detection system, a detection method thereof, and a touch screen terminal. Background technique [0002] Existing capacitive touch screen sensors are mainly based on two technologies, one is self-capacitance technology, and the other is mutual capacitance technology. [0003] Self-capacitance technology uses the sensing electrodes in the X and Y directions of the touch screen sensor to sense the capacitance between the human finger and the sensing electrodes respectively. Its electric field distribution and equivalent circuit are as follows figure 1 , figure 2 As shown, wherein the sensing electrode 11 emits electric field lines ( figure 1 Indicated by a dotted line), what is actually detected is the capacitance (electric field) between the human finger and the sensing electrode 11 of the touch screen. The basic principle is: there is a small coupling capa...

AI Technical Summary

Problems solved by technology

[0005] With the development of technology, requirements such as high light transmittance, improved product yield, and low cost have been paid more and more attention. A direct impact of this is that the main material used to make touch screen electrodes is indium tin oxide (ITO) (not limited to The sheet resistance of ITO) is increased, and the impedance of the touch screen electrode is increased

Traditional self-capacitance and mutual-capacitance technologies are difficult to adapt to the application conditions of high-impedance electrodes

[0006] In addition, in the application of traditional self-capacitance and mutual-capacitance technologies, in order to obtain greater touch sensitivity, the design of touch screen electrodes is very particular, the electrode patterns are more complicated, and the production process requirements are higher, which brings difficulties in production. Moreover, complex electrode patterns can also affect the visual effect of the display in some cases

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