Optical sensing module, system and method for operating optical sensing system

An optical sensing system, comprising:

• a control unit;
• and
• an optical sensing module, electrically connected with the control unit, including a light emitter and a photodiode unit, wherein the photodiode unit includes a first photodiode, a second photodiode and a third photodiode;
• wherein the control unit drives the light emitter to emit a sensing light with a spectrum covering an infrared wavelength range and processes a sensing value generated by the photodiode unit when sensing the light reflected by an object;
• and the optical sensing module implements a proximity sensor by operations of the second photodiode and the third photodiode, and the optical sensing module implements a biometric sensor by operations of the first photodiode, the second photodiode, and the third photodiode.

A method for operating an optical sensing system, comprising:

• emitting a sensing light from a light emitter to an object, wherein the sensing light has a spectrum covering an infrared wavelength range;
• receiving a reflected sensing light by a photodiode unit, wherein the photodiode unit includes a first photodiode for sensing a first wavelength light and generating a first sensing value, a second photodiode for sensing a second wavelength light and generating a second sensing value, and a third photodiode for sensing a third wavelength light and generating three sensing values;
• converting the first sensing value, the second sensing value and the third sensing value into a first digital signal, a second digital signal, and a third digital signal by a first signal converter, a second signal converter and a third signal converter respectively;
• determining the proximity of the object by the second digital signal and the third digital signal;
• and
• determining whether or not a surface of the object is a human skin by the first digital signal, the second digital signal, and the third digital signal that are respectively converted from the three sensing values generated by the photodiode unit that implements a biometric sensor.