Time-of-flight detecting device, system, and method

A time-of-flight (TOF) detecting system, comprising:

• a light source, configured to emit an incident light to an object;
• an optical system, configured to receive a reflected light after the incident light being reflected by the object and output the reflected light;
• a single-photon avalanche diode (SPAD) sensing circuit, configured to:
• receive the reflected light reflected from the object;
• and
• output a SPAD output signal based on the reflected light;
• and
• a processing circuit, coupled to the SPAD sensor and configured to:
• determine that whether the object is a near target or a far target based on the SPAD output signal;
• in response to the object is the near target or the far target being determined, adjust a mode of the SPAD sensing circuit;
• and
• determine a distance between the object and the TOF detecting device based on the mode.

A time-of-flight (TOF) detecting method, comprising:

• receiving, by a single-photon avalanche diode (SPAD) sensing circuit, a reflected light reflected from an object;
• outputting, by the SPAD sensing circuit, a SPAD output signal based on the reflected light;
• determining, by the processing circuit, that whether the object is a near target or a far target based on the SPAD output signal;
• in response to the object is the near target or the far target being determined, adjusting, by the processing circuit, a mode of the SPAD sensing circuit;
• and
• determining, by the processing circuit, a distance between the object and the TOF detecting device based on the mode.