Optical navigation mechanism for providing smooth user experience in unstable and worse environment

An optical navigation device, comprising:

• an optical sensor, for generating at least one image frame to obtain displacement data and used for transmitting the displacement data into a microcontroller for optical navigation, wherein the displacement is a relative displacement between the optical navigation device and an adjacent working surface;
• and
• the microcontroller, coupled to the optical sensor, for dynamically using different report rates to report the displacement data from the optical navigation device to a host device to be externally coupled to the optical navigation device through a specific communication interface in response to a result of the microcontroller detecting environment signal interference or a result of the microcontroller detecting a loading condition of the host device;
• wherein the displacement data is transmitted from the optical navigation device to the host device based on a different report rate, dynamically determined by the microcontroller, in response to a different loading condition of the host device;
• and, the microcontroller is arranged to periodically detecting whether signal interference occurs, is arranged to automatically use a higher report rate to report the displacement data if detecting that no signal interferences occur, and is arranged to automatically use a lower report rate to report the displacement data if detecting that the signal interference occurs;
• a dongle device, coupled between the optical navigation device and the host device, comprises a control circuit for monitoring a cumulative data amount of the displacement data on the specific communication interface;
• when the control circuit detects that the cumulative data amount increases up to a specific high level, the dongle device automatically transmits an indication signal to the optical navigation device to indicate a heavy loading condition to control the microcontroller to dynamically decrease to the lower report rate;
• and when the control circuit detects that the cumulative data amount decreases down to a specific low level, the dongle device transmits the indication signal to negotiate with the optical navigation device to immediately restore to the higher report rate.