A touch screen, detection method and mobile terminal

Abstract

An embodiment of the invention relates to the technical field of power electronics, and discloses a touch screen, comprising an orthogonal sequence generator for generating and transmitting a plurality of excitation signals to a driving circuit, wherein any two of the plurality of excitation signals are orthogonal; the driving circuit is used for connecting with the Tx lines and simultaneously supplying an excitation signal to each Tx line; the detection circuit is used for sampling the charge of the capacitor received by the Rx line coupled with the Tx line and converting the sampled charge into a total digital signal; the demodulation circuit is used for receiving the excitation signal generated by the quadrature sequence generator and the total digital signal of the detection circuit, and demodulating the total digital signal according to the excitation signal to obtain the capacitance data of each capacitor on the whole capacitance screen. The invention provides a touch screen, a detection method and a mobile terminal, which greatly shortens the time for the detection circuit to scan and obtain capacitance data on the whole capacitance screen, improves the reaction speed of thetouch screen and has stronger anti-noise ability.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of power electronics, and in particular to a touch screen, a detection method, and a mobile terminal. Background technique [0002] With the development of the Internet of Things, for most of the current smart phones, the screens have multi-touch capabilities. The screen is generally composed of a capacitive screen. The capacitive screen is composed of a driving layer and a sensing layer. The intersection of the Tx line in the driving layer and the Rx line in the sensing layer forms a capacitance grid, and the capacitance grid spreads across the entire screen. When the human hand approaches, it will change the electric field Rx line of the capacitance grid point, thereby causing the change of the capacitance size. According to the change of the capacitance grid point at different positions, the position touched by the human hand can be obtained. This is the basic principle of capaci...

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Problems solved by technology

[0003] However, the inventors have found that there are at least the following problems in the prior art: when one Tx line in the driving layer starts to work, the other Tx lines remain static, and at this time, RX1, RX2, RX3, etc. of the sensing layer can receive signals respectively, and the signals The strength is proportional to the capacitors C11, C12, C13, etc.

The whole architecture is very weak against external interference of various frequencies

And because when one Tx line is working, the other Tx lines remain static, and it takes a long time to scan sequentially, so it will take a long time to complete the evaluation of the capacitance of a whole screen

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