Patent ID: 11973099
Assignee: HON HAI PRECISION INDUSTRY CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 9:
10. A method for making a fingerprint identification module, comprising:
providing a first substrate, wherein the first substrate is provided with a first base layer and a first light-shielding layer on the first base layer, wherein the first base is transparent, the first light-shielding layer is opaque and defines a plurality of first through holes spaced apart from each other;
providing a second substrate, wherein the second substrate is provided with a second base layer, a plurality of optical sensors on the second base layer spaced apart from each other, and a second light-shielding layer on a side of the plurality of optical sensors away from the second base layer, wherein the second base layer is transparent, the second light-shielding layer is opaque and defines a plurality of second through holes spaced apart from each other, and each of the plurality of second through holes exposes a corresponding one of the plurality of optical sensors; and
forming a support portion on a periphery of the first substrate or the second substrate, wherein the support portion bonds the first substrate and the second substrate together and maintains a distance between the first substrate and the second substrate;
wherein each of the plurality of second through holes is aligned with a corresponding one of the plurality of first through holes;
the first light-shielding layer, the plurality of optical sensors, and the second light-shielding layer are sequentially sandwiched between the first substrate and the second substrate;
an area enclosed by the supporting portion between the first substrate and the second substrate forms a gap portion;
the first substrate is further provided with a third light-shielding layer, the third light-shielding layer defines a plurality of third through holes spaced apart from each other, and each of the plurality of third through holes is aligned with the corresponding one of the plurality of first through holes and a corresponding one of the plurality of second through holes; and
a maximum imaging size of the optical signal reflected by the fingerprint on the second substrate after being collimated sequentially by the plurality of first through holes, the plurality of third through holes and the gap portion is less than a distance between any two adjacent ones of the plurality of optical sensors.