Touch screen integrated with NFC antenna, terminal, and near field communication method therefor

1. A touch screen terminal, comprising:

an NFC antenna-integrated touch screen, comprising:

a substrate having a touch sensing region;

a touch sensing electrode arranged in the touch sensing region; and

a single-turn conductive wire which is used as a ground loop of electrostatic discharge (ESD) conductive wire, arranged on a periphery of the touch sensing region,

wherein the single-turn conductive wire is not contacted with the touch sensing region and is reused as a screen antenna for near field communication; and

a touch control chip, comprising:

a touch control manager connected to the touch sensing electrode, wherein the touch control manager is configured to process a sensing signal from the touch sensing electrode and calculate a touch coordinate; and

a near field communication manager connected to the single-turn conductive wire, wherein the near field communication manager is configured to process a near field communication; and

a terminal main controller, configured to acquire and manage information of the touch control and near field communication;

wherein the near field communication manager is configured to:

have a reference voltage output terminal, wherein the reference voltage output terminal is electrically connected to a first end of the screen antenna, and wherein the reference voltage output terminal is configured to provide a reference voltage and a bias for the touch control chip;

have an input terminal, wherein the input terminal is electrically connected to a second end of the screen antenna via a switch unit;

buffer and amplify an external near field communication signal received by the screen antenna;

have an output terminal, wherein the a second output terminal is electrically connected to the a second end of the screen antenna;

send out, via the screen antenna, a near field communication signal to be output, wherein sending out a near field communication signal to be output occurs at a different time as buffering and amplifying an external field communication signal received by the screen antenna, and when an external near field communication signal received by the screen antenna is buffered and amplified, the switch unit is switched on, and when a near field communication signal to be output is sent out, the switch unit is switched off;

demodulate the amplified signal into a digital signal; and

be connected to the terminal main controller, wherein the near field communication manager is configured to decode the digital signal obtained via demodulation, and send a decoded result to the terminal main controller; and

receive data to be sent from the terminal main controller and demodulate the received data, and output a modulated signal to be sent out to the antenna.

2. The touchscreen terminal according to claim 1 , where in the first sending module is idle, the output terminal thereof stays in a high-impedance state.

3. The touch screen terminal according to claim 1 , wherein the touch screen terminal further comprises a first filter module, and the screen antenna is connected to the near field communication manager via the first filter module;

wherein the first filter module is configured to perform anti-electromagnetic interference (EMI) filter and/or impedance matching for a near field communication signal received and sent by the screen antenna, and comprises a first resistor, a first capacitor and a second capacitor, wherein one terminal of the screen antenna is electrically connected to the near field communication manager via the first resistor and the other terminal of the screen antenna is connected to the reference voltage output terminal, the first capacitor is connected between the two line terminals of the screen antenna, and the second capacitor is connected between the other line terminal of the screen antenna and the ground.

4. The touch screen terminal according to claim 1 , wherein two line terminals of the screen antenna are respectively connected to the ground via an ESD protective diode.

5. The touch screen terminal according to claim 3 , wherein the reference voltage output terminal is connected to the ground via an ESD protective diode, and the output terminal is connected to the ground via an ESD protective diode.