公开(公告)号：US20220254186A1

公开(公告)日：2022-08-11

申请号：US17630213

申请日：2020-08-06

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Jianwen WANG ,  Feng YU ,  Huihua ZHAO ,  Jing CHU ,  Heng WANG

IPC: G06V40/13 ,  G06V40/12 ,  G06F3/042

Abstract: A fingerprint recognition apparatus includes an optical film and an image sensor that are disposed at an interval of a first distance along a first direction. The optical film includes a first area and a second area, transmittances of the first area and the second area are different, the first area and the second area form a first pattern, and when receiving light reflected by a first object, the optical film converts the light into an optical image that has the first pattern and transmits the optical image to the image sensor. The image sensor is configured to receive the optical image and convert the optical image into an electrical signal. The electrical signal is used to construct an image of the first object.

公开(公告)号：US20210249835A1

公开(公告)日：2021-08-12

申请号：US17243656

申请日：2021-04-29

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yuanbing CHENG ,  Heng WANG ,  Jing DAI ,  Yinghua DONG

IPC: H01S3/10 ,  H01S5/14 ,  G02B6/12

Abstract: An embodiment of the present invention provides a photodetector chip, including a substrate, a semiconductor optical amplification section, and a photodetection section. The substrate includes a surface, the photodetection section and the semiconductor optical amplification section are arranged on the substrate, and the photodetection section is located in an optical signal output direction of the semiconductor optical amplification section. The semiconductor optical amplification section amplifies and filters an input optical signal to output an amplified and filtered optical signal to the photodetection section. The photodetection section is configured to convert the amplified and filtered optical signal into an electrical signal. The semiconductor optical amplification section includes a grating, the grating includes a first grating and a second grating that are cascaded, and the first grating is a slanted grating. The first grating and the second grating are configured to filter an optical signal entering the semiconductor optical amplification section.