Stylus detection method, system, and related apparatus for switching frequencies for detecting input signals

An electronic device comprising:

• a touchscreen;
• and
• a processor coupled to the touchscreen and configured to:
• detect for an input signal of a stylus at a first frequency;
• receive a first input of the stylus through the touchscreen;
• switch, in response to the first input, to detecting for the input signal at a second frequency;
• switch to detecting for the input signal at a third frequency when a first duration during which the electronic device does not detect the input signal while detecting for the input signal at the second frequency is greater than a first time period, wherein the second frequency is greater than the third frequency, and wherein the third frequency is greater than the first frequency;
• receive a second input of a user while detecting for the input signal at the second frequency;
• turn off, in response to the second input, the touchscreen;
• and
• switch, in response to the second input, to detecting for the input signal at the first frequency.

A computer program product comprising computer-executable instructions stored on a non-transitory computer readable storage medium that, when executed by a processor of an electronic device, cause the electronic device to:

• detect for an input signal of a stylus at a first frequency;
• receive a first input of the stylus through a touchscreen of the electronic device;
• switch, in response to the first input, to detecting for the input signal at a second frequency;
• switch to detecting for the input signal at a third frequency when a duration during which the electronic device does not detect the input signal while detecting for the input signal at the second frequency is greater than a first time period, wherein the second frequency is greater than the third frequency, and wherein the third frequency is greater than the first frequency;
• receive a second input of a user while detecting for the input signal at the second frequency;
• turn off, in response to the second input, the touchscreen;
• and
• switch, in response to the second input, to detecting for the input signal at the first frequency.