US 12,412,418 B1
Apparatus for identifying fingerprint, and electronic device
Yin Wang, Shenzhen (CN); and Sichao Zhang, Shenzhen (CN)
Assigned to SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed on Sep. 25, 2024, as Appl. No. 18/895,797.
Int. Cl. G06V 40/13 (2022.01)
CPC G06V 40/1324 (2022.01) [G06V 40/1318 (2022.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus for identifying a fingerprint, being adapted to be arranged below a display screen of an electronic device to implement under-display optical fingerprint identification, wherein the apparatus for identifying a fingerprint comprises: a plurality of fingerprint identification units distributed in an array, and each fingerprint identification unit among the plurality of fingerprint identification units comprises:
a microlens;
at least two light blocking layers arranged below the microlens, wherein each light blocking layer among the at least two light blocking layers is provided with a light-passing aperture, and the light-passing aperture is configured to pass a fingerprint light signal which is returned after being reflected or scattered by a finger above the display screen and converged by the microlens; and
a plurality of pixel units arranged below the at least two light blocking layers, wherein the light-passing apertures in the at least two light blocking layers form a plurality of light guiding channels corresponding to the plurality of pixel units, and the plurality of pixel units are arranged below the plurality of light guiding channels with one-to-one correspondence therebetween;
wherein the plurality of light guiding channels comprise a first light guiding channel and a second light guiding channel, an angle between a direction of the first light guiding channel and a first direction is a first angle, and an angle between a direction of the second light guiding channel and the first direction is a second angle, wherein the first angle is different from the second angle, and the first direction is a direction normal to a plane where the plurality of pixel units are located;
a position of a light-passing aperture in the first light guiding channel and located in an underlying light blocking layer among the at least two light blocking layers satisfies 0≤S11/Pa≤1.4, and a position of a light-passing aperture in the second light guiding channel and located in the underlying light blocking layer satisfies 0.75≤S12/Pa≤2.8, wherein S11 is a distance from a center of the light-passing aperture in the first light guiding channel and located in the underlying light blocking layer to a center of projection of the microlens on the underlying light blocking layer, S12 is a distance from a center of the light-passing aperture in the second light guiding channel and located in the underlying light blocking layer to the center of the projection of the microlens on the underlying light blocking layer, and Pa is an arrangement period of the plurality of pixel units; and
the plurality of pixel units comprise a first pixel unit corresponding to the first light guiding channel and a second pixel unit corresponding to the second light guiding channel, the first pixel unit is configured to receive a first fingerprint light signal transmitted through the first light guiding channel, the second pixel unit is configured to receive a second fingerprint light signal transmitted through the second light guiding channel, and the first fingerprint light signal and/or the second fingerprint light signal are/is used for fingerprint identification.