Fingerprint acquisition device and preparation method thereof

Abstract

Embodiments of the invention provide a fingerprint acquisition device and a preparation method thereof. The device comprises a substrate, a two-dimensional material array layer and a flexible protection layer, wherein the substrate, the two-dimensional material array layer and the flexible protection layer are connected in sequence from top to bottom; the substrate comprises a substrate layer, a bottom electrode layer and an insulating array layer; the two-dimensional material array layer is formed on the upper surface of the insulating array layer and is connected with the bottom electrode layer via through holes in the insulating array layer; and the bottom electrode layer and the two-dimensional material array layer are electrically connected with the substrate, respectively, so as to form a plurality of detection loops. The method comprises the following steps of: forming the bottom electrode layer on the substrate layer; forming the insulating array layer with a plurality of through holes on the bottom electrode layer; forming a connection electrode layer at one side of the through holes; forming a plurality of two-dimensional material units on the connection electrode layer and the insulating array layer; respectively connecting two ends of the two-dimensional material layers with the connection electrode layer and a top electrode layer; electrically connecting the bottomelectrode layer and the top electrode layer with the preset substrate, respectively; and covering the flexible protection layer on the surface of the device. According to the device and the method, the fingerprint recognition correctness and efficiency are improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of image acquisition, and in particular to a fingerprint acquisition device and a preparation method thereof. Background technique [0002] With the development of electronic information technology and the popularization of electronic products, the security of personal data and information in some electronic products (especially mobile phones and computers) has attracted more and more attention. Currently common verification methods include password verification, graphic verification, etc., that is, input a specific character string combination, or input a specific graphic into these electronic products. If the input value is the same as the predetermined value, the purpose of verifying the user's identity has been achieved. [0003] In recent years, identity authentication methods such as biometrics have gradually emerged, that is, by detecting specific biological characteristics on a ...

AI Technical Summary

Problems solved by technology

Optical detection obtains the grayscale image of the surface texture by irradiating light on the surface of the finger. Although this technology is relatively mature and cheap, the equipment is large in size and has high requirements for the cleanliness of the opponent; The grayscale image of the texture is obtained by different capacitance differences. This technology overcomes the defect of large volume of optical detection equipment and realizes the goal of integrating in smart phones. However, it still has high requirements for the cleanliness of fingers. Reliability is still not high; ultrasonic detection uses ultrasonic waves to generate different sizes of echoes at different material interfaces to detect the position of fingerprint ridges and valleys. This technology also has a small size, which reduces the impact on finger cleanliness to a certain extent. Requirements, but its acquisition time is relatively long, which reduces the efficiency of fingerprint identification

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