Proximity sensor operating method and proximity sensor applying the method

A proximity sensor operating method, applied for a proximity sensor comprising a light-emitting device and a processing circuit, the proximity sensor operating method comprising a standby mode and a check mode, wherein:

• when the proximity sensor is in the standby mode and an output of the proximity sensor is a first sensing state, the processing circuit drives a driving current of the light-emitting device to comprise a first driving current;
• when the proximity sensor is triggered, the proximity sensor enters the check mode and still outputs the first sensing state, and the processing circuit switches the driving current to comprise a second driving current larger than the first driving current;
• and
• when the proximity sensor is in the check mode, and a length of time or number of times of triggering the proximity sensor is larger than or equal to a threshold length or number, the output of the proximity sensor switches from the first sensing state to the second sensing state, and the proximity sensor returns to the standby mode such that the processing circuit drives the driving current to comprise the first driving current.