Optical fingerprint module, screen assembly and electronic device

Abstract

The invention provides an optical fingerprint module, a screen assembly and an electronic device, which relate to the technical field of the fingerprint module. The optical fingerprint module comprises: a lens barrel, a lens, a light filter and a fingerprint identification chip. the fingerprint identification chip includes a first plane, The optical filter is arranged on the first plane, the lensbarrel comprises a connecting part and a mounting part remote from the connecting part, the lens is mounted on the mounting part, and the connecting part is arranged on the first plane of the fingerprint identification chip so that the distance between the lens and the fingerprint identification chip is a preset value. As that len is arranged in the len barrel and the lens barrel is directly connected with the fingerprint identification chip, the factors affect the distance between the fingerprint identification chip and the fingerprint identification chip are reduced, the precision of the optical fingerprint module can be effectively improved, and the defect rate of the product can be reduced.

Description

technical field [0001] The invention relates to the technical field of fingerprint modules, in particular to an optical fingerprint module, a screen component and electronic equipment. Background technique [0002] The existing optical fingerprint module consists of a bracket, a lens, a filter, a fingerprint chip, and a circuit substrate. The chip is fixed on the circuit substrate with glue, and the electrical signal connection is realized between the gold wire and the circuit substrate. The optical filter is bonded to the chip with optical glue, and the bracket is bonded to the circuit substrate with structural glue. , the lens assembly is fixed in the bracket hole, the lens is a convex lens imaging principle, and the fingerprint optical signal is focused on the chip sensing area to collect fingerprints. [0003] Since the principle of convex lens imaging is adopted, the distance between the lens and the chip is required to be a fixed value. If there is a discrepancy betwe...

AI Technical Summary

Problems solved by technology

[0003] Since the principle of convex lens imaging is adopted, the distance between the lens and the chip is required to be a fixed value. If there is a discrepancy between the actual module production and the theoretical value, it will affect the fingerprint optical signal collection, which will seriously cause the module to be scrapped and unusable.

The accuracy of the distance between the lens and the chip is determined by the accumulation of the machining accuracy and installation accuracy of the components between the two. In the existing technical solutions, the accuracy of the distance between the lens and the chip includes: the bonding accuracy between the bracket and the circuit substrate , the processing accuracy of the bracket itself, the assembly accuracy of the bracket and the lens, the processing accuracy of the lens itself, the bonding accuracy between the chip and the circuit substrate, the thickness accuracy of the chip itself, the flatness of the circuit substrate, etc., all these factors affect the lens and the chip. Accuracy of the distance between these factors, the accumulation of these factors will eventually lead to a greater risk of a difference between the actual distance between the lens and the chip of the actually produced module and the design value

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