Title:
ULTRASONIC FINGERPRINT IDENTIFICATION CIRCUIT AND DRIVING METHOD THEREFOR, AND FINGERPRINT IDENTIFICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2020/248986
Kind Code:
A1
Abstract:
An ultrasonic fingerprint identification circuit and a driving method therefor, and a fingerprint identification apparatus. The ultrasonic fingerprint identification circuit comprises an emission electrode, a receiving electrode, a piezoelectric layer arranged therebetween, and a signal output unit, wherein the emission electrode is configured to receive an alternating current signal at an emission stage; and the receiving electrode is connected to the signal output unit. The circuit further comprises: a photosensitive unit, a positive electrode of which is connected to the receiving electrode, and a negative electrode of which is connected to a first fixed potential, such that the photosensitive unit is in a reverse bias state.
Inventors:
LIU YINGMING (CN)
CHEN XIAOCHUAN (CN)
WANG HAISHENG (CN)
DING XIAOLIANG (CN)
WANG LEI (CN)
LI CHANGFENG (CN)
LI XIUFENG (CN)
ZHANG CHENYANG (CN)
CHEN XIAOCHUAN (CN)
WANG HAISHENG (CN)
DING XIAOLIANG (CN)
WANG LEI (CN)
LI CHANGFENG (CN)
LI XIUFENG (CN)
ZHANG CHENYANG (CN)
Application Number:
PCT/CN2020/095242
Publication Date:
December 17, 2020
Filing Date:
June 10, 2020
Export Citation:
Assignee:
BOE TECHNOLOGY GROUP CO LTD (CN)
International Classes:
G06K9/00
Foreign References:
| CN110210442A | 2019-09-06 | |||
| US20190050618A1 | 2019-02-14 | |||
| CN108363993A | 2018-08-03 | |||
| CN107204172A | 2017-09-26 | |||
| CN109154959A | 2019-01-04 | |||
| CN109598258A | 2019-04-09 | |||
| CN106663202A | 2017-05-10 |
Attorney, Agent or Firm:
LIU, SHEN & ASSOCIATES (CN)
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