US 11,657,638 B2
Ultrasonic fingerprint sensor apparatus, method of operating ultrasonic fingerprint sensor apparatus, and method of fabricating ultrasonic fingerprint sensor apparatus
Yingming Liu, Beijing (CN); Haisheng Wang, Beijing (CN); Yanling Han, Beijing (CN); Yuzhen Guo, Beijing (CN); and Lijun Zhao, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 16/957,219
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Sep. 27, 2019, PCT No. PCT/CN2019/108569
§ 371(c)(1), (2) Date Jun. 23, 2020,
PCT Pub. No. WO2021/056421, PCT Pub. Date Apr. 1, 2021.
Prior Publication US 2023/0087503 A1, Mar. 23, 2023
Int. Cl. G06K 9/20 (2006.01); G06V 40/13 (2022.01); B06B 1/06 (2006.01)
CPC G06V 40/1306 (2022.01) [B06B 1/0692 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An ultrasonic fingerprint sensor apparatus, comprising:
an array of a plurality of ultrasonic sensors on a base substrate, wherein a respective one of the plurality of ultrasonic sensors comprises a first electrode, a second electrode, and a piezoelectric layer between the first electrode and the second electrode, an orthographic projection of the first electrode on the base substrate at least partially overlaps with an orthographic projection of the second electrode on the base substrate and at least partially overlaps with an orthographic projection of the piezoelectric layer on the base substrate;
a plurality of bias lines respectively electrically connected to a plurality of columns of ultrasonic sensors in the array of the plurality of ultrasonic sensors, wherein a respective one of the plurality of bias lines is configured to be electrically connected to the second electrode of a respective one of the plurality of ultrasonic sensors in a respective one of the plurality of columns of ultrasonic sensors;
a polarization electrode, wherein an orthographic projection of the polarization electrode on a base substrate is substantially non-overlapping with an orthographic projection of the plurality of ultrasonic sensors on the base substrate;
a first lead line electrically connected to the polarization electrode; and
a second lead line electrically connected to the plurality of bias lines;
wherein the first lead line and the second lead line are in a peripheral region of the ultrasonic fingerprint sensor apparatus.