Fingerprint sensing system and operation method thereof

A fingerprint sensing system, comprising:

• a plurality of micro-lenses, arranged in an array;
• a sensor, having a plurality of sensing pixels arranged in an array;
• a shielding structure, wherein the sensor, the shielding structure and the micro-lenses are sequentially arranged along an arrangement direction;
• and
• a controller, electrically connected to the sensor;
• wherein
• a pitch between the micro-lenses is greater than a pitch between the sensing pixels;
• the controller forms a fingerprint image according to signals of a plurality of output pixels of the sensor, wherein each of the output pixels is one of every at least four of neighboring sensing pixels,
• wherein the controller uses sensing pixels that are not selected as output pixel among the every at least four of neighboring sensing pixels as noise value of the each of the output pixels.