Multi-protocol coexistence in an active stylus

An active stylus, comprising:

• transmitter circuitry for sending electrical signals to a digitizer of a display device;
• receiver circuitry for receiving electrical signals from the digitizer of the display device;
• a processor for operating the active stylus according to a first communication protocol compatible with a first display device, or a second communication protocol compatible with a second display device, wherein the second communication protocol is different from the first communication protocol, the processor configured to:
• operate the stylus according to the first communication protocol upon waking;
• listen for beacons indicating the presence of the second display device operating according to the second communication protocol, and automatically switch the stylus from the first communication protocol to the second communication protocol if a beacon is detected;
• perform a stylus capture detection routine while operating according to the second communication protocol, the stylus capture detection routine to determine whether the switch to the second communication protocol was erroneous, wherein the stylus capture detection routine is to determine whether a user is attempting to use the active stylus with the first display device;
• and
• if the stylus capture detection routine detects that the switch to the second communication protocol was erroneous, switch the stylus from the second communication protocol back to the first communication protocol to enable communication with the first display device.

One or more non-transitory computer-readable storage media for storing computer-readable instructions, the computer-readable instructions providing a system for detecting a stylus capture event in an active stylus, the instructions, when executed, are configured to:

• operate the stylus according to the first communication protocol upon waking;
• listen for beacons indicating the presence of a display device operating according to the second communication protocol, and automatically switch the stylus from the first communication protocol to the second communication protocol if a beacon is detected, wherein the second communication protocol is different from the first communication protocol;
• perform a stylus capture detection routine while operating according to the second communication protocol, the stylus capture detection routine to determine whether the switch to the second communication protocol was erroneous;
• and
• if the stylus capture detection routine detects that the switch to the second communication protocol was erroneous, switch the stylus from the second communication protocol back to the first communication protocol to enable communication with the first display device.