ULTRASONIC FINGERPRINT RECOGNITION ASSEMBLY AND ELECTRONIC DEVICE

WIPO Patent Application WO/2021/000437

A1

Provided in the present invention is an ultrasonic fingerprint recognition assembly, comprising a cover plate, an ultrasonic sensor and a display panel, wherein the ultrasonic sensor is placed between the cover plate and the display panel, and the ultrasonic sensor comprises a TFT substrate arranged on a side close to the display panel, and a piezoelectric layer and a conductive layer arranged on the TFT substrate in sequence; the piezoelectric layer is coated on the substrate by mixing piezoelectric material and an organic solvent, and is obtained by means of crystallization and polarization treatment, and the organic solvent comprises at least one of methyl ethyl ketone, propylene glycol methyl ether acetate, and dimethylacetamide. The ultrasonic sensor in the ultrasonic fingerprint recognition assembly provided in the present invention is arranged between the cover plate and the display panel. Due to the limited thickness of the cover plate, the ultrasonic signal is not affected by the cover plate, the penetration is strong, and the fingerprint recognition process is no longer restricted by the display panel; moreover, the light transmittance of the piezoelectric layer is uniform and the light transmittance thereof is excellent, thereby improving the speed and accuracy of fingerprint recognition.

LIU XUANXUAN (CN)

PCT/CN2019/108571

January 07, 2021

September 27, 2019

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NANCHANG O FILM BIO IDENTIFICATION TECH CO LTD (CN)

G06K9/00

CN107967444A	2018-04-27
CN109494299A	2019-03-19
CN109651900A	2019-04-19
CN208954062U	2019-06-07

SCIHEAD IP LAW FIRM (CN)

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