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Ultrasonic fingerprint identification method, device, equipment and storage medium

A technology of fingerprint recognition and ultrasonic wave, which is applied in character and pattern recognition, acquisition/sorting of fingerprints/palmprints, instruments, etc. It can solve the problems of fingerprint recognition effect decline and achieve the effect of improving the fingerprint recognition effect decline

Pending Publication Date: 2020-12-11
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

[0003] However, the current ultrasonic identification scheme, when the temperature shifts, or after the film is applied, may lead to a decline in the fingerprint identification effect

Method used

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  • Ultrasonic fingerprint identification method, device, equipment and storage medium
  • Ultrasonic fingerprint identification method, device, equipment and storage medium
  • Ultrasonic fingerprint identification method, device, equipment and storage medium

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Embodiment Construction

[0026] The terms used in the embodiments of the present application are only used to explain specific embodiments of the present application, and are not intended to limit the present application.

[0027] Before introducing the embodiment of the present application, the prior art will be described firstly. For example, when the ultrasonic fingerprint recognition technology is applied on the display screen, the ultrasonic transducer array is arranged under the display screen. When the ultrasonic transducer array emits ultrasonic waves, , after a certain time delay, the returned ultrasonic signal is collected. This time delay is related to the thickness and material of the display screen. Therefore, a time delay can be set in advance to ensure that the collected signal strength is relatively high. However, If the ambient temperature of the display screen shifts, or after the screen film is pasted, the original ultrasonic propagation path or speed will change, which may cause the...

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Abstract

The embodiment of the invention provides an ultrasonic fingerprint identification method, a device, equipment and a storage medium, relates to the technical field of fingerprint identification, and can improve fingerprint identification effect reduction caused by temperature offset and film pasting. The ultrasonic fingerprint identification method comprises the following steps: transmitting a first ultrasonic signal in a time period starting from a first moment and ending from a first sub-moment, and respectively collecting a first return ultrasonic signal in a plurality of sampling time periods; taking the sampling time period corresponding to the first return ultrasonic signal with the maximum signal intensity as a reference sampling time period, and taking the delay time of the reference sampling time period relative to the first moment as reference delay; transmitting a second ultrasonic signal from the second moment and from the end of the second sub-moment, acquiring at least a second return ultrasonic signal in the reference acquisition time period, wherein the delay time of the reference acquisition time period and the second moment is equal to the reference delay time; andperforming ultrasonic fingerprint imaging based on the acquired second return ultrasonic signal.

Description

technical field [0001] The present application relates to the technical field of fingerprint identification, in particular to an ultrasonic fingerprint identification method, device, equipment and storage medium. Background technique [0002] Ultrasonic fingerprint recognition technology uses ultrasonic waves of a specific frequency to scan the finger. Due to the difference in acoustic impedance between the finger skin and the air, the ultrasonic echo intensity is different. identify. Compared with optical fingerprint recognition technology, the ultrasonic solution has the advantages of stronger penetrability, waterproof and antifouling, and higher security, and has a good application prospect. [0003] However, in the current ultrasonic identification scheme, when the temperature shifts, or after the film is applied, the fingerprint identification effect may decline. Contents of the invention [0004] The technical solution of the present application provides an ultraso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06V40/1306
Inventor 娄迅沈健王红超
Owner SHENZHEN GOODIX TECH CO LTD
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