Capacitive screens and methods for interaction with a stylus

A capacitive screen, comprising:

• a touch control chip configured to generate a current signal;
• a screen coil integrated into the capacitive screen, wherein the screen coil is configured to:
• receive an electromagnetic signal from a stylus,
• generate a second electromagnetic signal based on the current signal, and
• transmit the second electromagnetic signal to the stylus.

A method for operating a capacitive screen and a stylus, comprising:

• generating, by a screen coil integrated into the capacitive screen, a first electromagnetic signal based on a first current signal;
• transmitting the first electromagnetic signal to the stylus;
• receiving, by the screen coil, a second electromagnetic signal from the stylus in response to the first electromagnetic signal;
• converting the second electromagnetic signal into a second current signal;
• and
• determining a quantitative distance between the capacitive screen and the stylus based on a magnitude or waveform of the second current signal.

A capacitive screen, comprising:

• at least one processor;
• and
• a memory communicatively connected to the at least one processor;
• wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the following:
• generating, by a screen coil integrated into the capacitive screen, a first electromagnetic signal based on a first current signal;
• transmitting the first electromagnetic signal to a stylus;
• receiving, by the screen coil, a second electromagnetic signal from the stylus in response to the first electromagnetic signal;
• converting the received second electromagnetic signal into a second current signal;
• and
• determining a quantitative distance between the capacitive screen and the stylus based on a magnitude or waveform of the second current signal.