US 11,810,395 B2
Optical fingerprint identification apparatus, electronic device and fingerprint identification method
Canhong Du, Shenzhen (CN)
Assigned to SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by SHENZHEN GOODIX TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed on Dec. 14, 2019, as Appl. No. 16/714,718.
Application 16/714,718 is a continuation of application No. PCT/CN2019/084400, filed on Apr. 25, 2019.
Prior Publication US 2020/0342197 A1, Oct. 29, 2020
Int. Cl. G06V 40/12 (2022.01); G06V 10/141 (2022.01); H04N 23/56 (2023.01); G06V 40/13 (2022.01)
CPC G06V 40/1382 (2022.01) [G06V 10/141 (2022.01); G06V 40/1318 (2022.01); H04N 23/56 (2023.01); G06V 40/1341 (2022.01); G06V 40/1394 (2022.01)] 15 Claims
OG exemplary drawing
 
1. An optical fingerprint identification apparatus, applied to an electronic device having a display screen, comprising:
more than one non-visible light source, wherein each non-visible light source has a light emitting wave band, different non-visible light sources have different light emitting wave bands, and the different light emitting wave bands is used to distinguish between the real finger and the fake finger and foreign object, the non-visible light source is configured to emit non-visible light to a human finger to provide excitation light for fingerprint identification, the non-visible light source and the display screen are disposed horizontally side by side under a cover glass of the electronic device, the non-visible light source is located outside the display screen;
an optical component, disposed under a fingerprint detecting area of the display screen, and configured to receive signal light scattered and reflected by the human finger; and
a fingerprint sensor, disposed under the optical component, and configured to perform imaging based on the signal light passing through the optical component, wherein a working wave band of the fingerprint sensor is corresponding to a light emitting wave band of the non-visible light source;
wherein the non-visible light source is disposed on at least one side of a universal serial bus (USB) interface of the electronic device on the plane where the USB interface is located that is parallel to the display screen, and the USB interface and the non-visible light source is disposed at a central position of a lower edge of the electronic device;
wherein the optical component comprises: at least one lens and a support;
the lens is configured to converge the signal light and direct the signal light to the fingerprint sensor; and
the support is attached to the bottom surface of the display screen, interior of the support has accommodation space to accommodate the lens, and the support is configured to fix the lens between the display screen and the fingerprint sensor, so that there is a gap between the lens and the display screen, and there is a gap between the lens and the fingerprint sensor;
wherein the optical fingerprint identification apparatus comprises two operating modes of a finger approaching detection mode and a fingerprint detection mode;
in the finger approaching detection mode, the non-visible light source periodically and intermittently emits light to detect whether a finger is approaching;
in the finger approaching detection mode, a first driving current is configured to drive the non-visible light source to actively emit light, and the non-visible light source has a first light emitting period and a first light emitting time;
in the fingerprint detection mode, a second driving current is configured to drive the non-visible light source to actively emit light, and the non-visible light source has a second light emitting period and a second light emitting time; and
the second period is greater than the first period, the second light emitting time is greater than the first light emitting time, and the second driving current is greater than the first driving current.