Fingerprint recognition device and electronic equipment

Abstract

The invention discloses a fingerprint recognition device and electronic equipment, and aims to improve the fingerprint imaging quality while realizing lightening and thinning of the fingerprint recognition device. The fingerprint recognition device is suitable for the lower part of a display screen and comprises a plurality of fingerprint recognition units distributed in an array, and each fingerprint recognition unit comprises a micro lens; at least one light blocking layer, each light blocking layer is provided with a small light through hole, N small light through holes are formed in the bottom light blocking layer, and the maximum aperture D1 of each small light through hole and the maximum aperture CA of the micro lens meet the condition that D1 / CA is larger than or equal to 0.02 andsmaller than or equal to 0.4, so that N light guide channels in different directions are formed; the N pixel units are arranged below the at least one light blocking layer and are arranged at the bottoms of the N light guide channels in a one-to-one correspondence manner; after fingerprint optical signals returned from a finger above the display screen are converged through the micro lens, N target fingerprint optical signals in different directions are transmitted to N pixel units through N light guide channels respectively and used for fingerprint recognition.

Description

technical field [0001] The present application relates to the technical field of optical fingerprints, and more specifically, to a fingerprint identification device and electronic equipment. Background technique [0002] Due to the increasing miniaturization of handheld electronic products in the future, the size of the current lens-type under-screen optical fingerprint products is difficult to adapt to this trend, and it is urgent to develop in the direction of thinner thickness, smaller volume, and higher integration. However, in the existing miniaturization schemes, the image contrast of the collimation hole imaging is related to the depth of the collimation hole, and a relatively large depth is required to achieve high imaging quality. At the same time, the light utilization rate of this scheme is low. The solution of using microlens to focus is limited by the technology and lens surface shape. Although the light utilization rate is high, the signal is easy to alias, res...

AI Technical Summary

Problems solved by technology

[0002] Due to the increasing miniaturization of handheld electronic products in the future, the size of the current lens-type under-screen optical fingerprint products is difficult to adapt to this trend, and it is urgent to develop in the direction of thinner thickness, smaller volume, and higher integration.

However, in the existing miniaturization solutions, the image contrast of collimation hole imaging is related to the depth of the collimation hole, and a relatively large depth is required to achieve high imaging quality. At the same time, the light utilization rate of this solution is low.

The solution of using microlens to focus is limited by the technology and lens surface shape. Although the light utilization rate is high, the signal is easy to alias, resulting in low signal contrast and low fingerprint imaging quality.

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