Method, apparatus, and computer system of using an active pen to wake a computer device from a power-saving mode

An apparatus for cooperating with an active pen to wake a computer device from a power-saving mode, the computer device including said apparatus, a processor, and a touch screen display panel, said apparatus comprising:

• a detection circuit;
• and
• a control circuit that is electrically coupled to said detection circuit, that is to be electrically coupled to the processor of the computer device, and that is configured to, when the computer device is in the power-saving mode where the touch screen display panel is deactivated:
• control said detection circuit to continuously detect presence of the active pen that is spaced apart from the touch screen display panel but is within an effective detecting range with respect to the touch screen display panel;
• and
• transmit, when said detection circuit detects that the active pen is spaced apart from the touch screen display panel but is within the effective detecting range, a first wakeup signal to the processor of the computer device to switch the computer device into an active mode where the touch screen display panel is activated and displays images.