Patent ID: 11954937
Assignee: POWERCHIP SEMICONDUCTOR MANUFACTURING CORPORATION
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A fingerprint sensing system, configured to receive an illumination beam reflected by a finger and transmitted it to the fingerprint sensing system to generate a fingerprint image, the fingerprint sensing system comprising:
a plurality of microlenses, arranged in an array;
a sensor, having a plurality of sensing pixels arranged in an array;
a first light filter layer, disposed between the microlenses and the sensor and having a plurality of first openings; a second light filter layer, disposed between the first light filter layer and the sensor and having a plurality of second openings,
wherein an optical axis of one of the microlenses only passes through one of the first openings and the second openings,
wherein the first light filter layer is configured to allow a color beam to pass but filter out the other color beams, the second light filter layer is configured to allow another color beam different from a light color of the color beam to pass but filter out the other color beams, and the third light filter layer is configured to allow yet another color beam different from the light color of the color beam and a light color of the another color beam to pass but filter out the other color beams;
a third light filter layer, disposed between the second light filter layer and the sensor and having a plurality of third openings,
wherein the illumination beam passes through the first openings, the second openings, or the third openings, so that the sensor receives the illumination beam,
wherein an optical axis of one of the microlenses simultaneously passes through one of the first openings, one of the second openings and one of the third openings; and
an infrared cutoff filter layer, disposed between the third light filter layer and the sensor,
wherein one of a first distance, a second distance, a third distance, and a fourth distance is different from the other distances,
the first distance is a distance from the microlenses to the first light filter layer,
the second distance is a distance from the first light filter layer to the second light filter layer,
the third distance is a distance from the second light filter layer to third light filter layer, and
the fourth distance is a distance from the third light filter layer to the infrared cutoff filter layer.