US 11,704,927 B2
Ultrasonic fingerprint sensor apparatus, display device, method of detecting fingerprint information, and method of fabricating ultrasonic fingerprint sensor apparatus
Yingming Liu, Beijing (CN); Haisheng Wang, Beijing (CN); Xiaoliang Ding, Beijing (CN); Pengpeng Wang, Beijing (CN); Xiufeng Li, Beijing (CN); and Chenyang Zhang, Beijing (CN)
Assigned to BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 16/970,928
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Nov. 14, 2019, PCT No. PCT/CN2019/118508
§ 371(c)(1), (2) Date Aug. 18, 2020,
PCT Pub. No. WO2021/092851, PCT Pub. Date May 20, 2021.
Prior Publication US 2023/0095588 A1, Mar. 30, 2023
Int. Cl. G06V 40/13 (2022.01); G06F 3/044 (2006.01); G06F 3/043 (2006.01)
CPC G06V 40/1306 (2022.01) [G06F 3/0433 (2013.01); G06F 3/0445 (2019.05); G06F 3/0446 (2019.05); G06F 2203/04103 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An ultrasonic fingerprint sensor apparatus, comprising:
a base substrate;
a first electrode layer on the base substrate, and comprising an array of a plurality of first electrodes spaced apart from each other by an inter-electrode region;
a piezoelectric layer on a side of the first electrode layer away from the base substrate;
a second electrode layer on a side of the piezoelectric layer away from the base substrate, and comprising one or more second electrodes; and
a first reference electrode layer configured to provide a first reference voltage; and
an insulating barrier layer on a side of the piezoelectric layer away from the base substrate;
wherein an orthographic projection of the first electrode layer on the base substrate is substantially non-overlapping with an orthographic projection of the second electrode layer on the base substrate;
the first electrode layer and the first reference electrode layer are between the base substrate and the piezoelectric layer;
the insulating barrier layer comprises a plurality of barrier blocks;
an orthographic projection of a respective one of the plurality of barrier blocks on the base substrate is substantially non-overlapping with the orthographic projection of the second electrode layer on the base substrate; and
an orthographic projection of a respective one of the plurality of barrier blocks on the base substrate at least partially overlaps with an orthographic projection of a respective one of the plurality of first electrodes on the base substrate.