Stray light coupling type biological information sensing module and electronic equipment using same

Abstract

A stray light coupling type biological information sensing module comprises at least a light-transmitting body, a display unit and an optical module. The light-transmitting body has a front side and a back side. The front side is designed to carry an organism. The display unit is installed on the back of the light-transmitting body to display a picture. The optical module is installed on the back of light-transmitting body by coupling glue and adjacent to the display unit. A plurality of first light of the picture is coupling input into the organism through light-transmitting body and process for a certain distance. A plurality of second light is coupling output from the organism and enters the optical module through the light-transmitting body. The optical module senses the second light to generate a biological image signal. A piece of electronic equipment is also disclosed. The stray light coupling type biological sensing module and the electronic equipment using the same can effectively use a light source of a display to realize optical fingerprint sensing.

Description

technical field [0001] The invention relates to a stray light coupled biological information sensing module and electronic equipment using the same. Background technique [0002] In recent years, the development of portable mobile devices such as mobile phones and tablet computers has been booming, and they have become indispensable supplies in life. What's more, with the development of the Internet and the needs of e-commerce, mobile phones are even more likely Integrates authentication functions representing personal identity, such as electronic ID cards, electronic passports, and consumer chip cards, etc. For this reason, in addition to traditional digital password authentication, etc., it is strengthened by human biological information (such as fingerprints, etc.) The software and hardware functions of personal identity authentication are the future development direction. Known biometric information sensing functions include fingerprints, palm prints, iris, veins, face ...

AI Technical Summary

Problems solved by technology

[0003] Known fingerprint sensors mainly include capacitive and optical. The biggest disadvantage of capacitive is that it cannot be used for wet fingers or sensing surface with liquid. In addition, this kind of capacitive fingerprint sensor is Embedded in the opening of the shell of the electronic device, it not only affects the appearance, but also dust and dirt will be stuck at the junction of the sensor and the electronic device, making the appearance even more ugly

[0004] Common optical fingerprint sensor 500, see figure 1 , mainly through the principle of total reflection formed between the optical plane (which is usually a plane 512 of the prism 510) contacted by the fingerprint FP and the fingerprint FP to construct an image of the fingerprint on the image sensor 530, this kind The biggest disadvantage of the sensing principle is that it cannot display a good continuous texture image for dry fingers, resulting in misreading problems when extracting feature points

At the same time, it is also necessary to provide a collimated light source 520 as a light source based on the principle of total reflection, which also increases the cost and complexity of design

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