CN113642366A - Fingerprint imaging module, method and electronic equipment - Google Patents

Abstract

The invention provides a fingerprint imaging module, a fingerprint imaging method and electronic equipment. Fingerprint formation of image module includes: a substrate; one side of the substrate is used for placing finger fingerprints; the luminous layer is arranged on one side of the substrate, which is far away from the finger, and is used for emitting first light penetrating through the substrate; the first light rays are reflected by fingers to form reflected light rays penetrating through the substrate; the transmission layer is arranged on one side of the luminous layer far away from the finger and is used for transmitting the reflected light to the imaging element; and the imaging element is arranged on one side of the transmission layer and used for obtaining a fingerprint image according to the reflected light. Fingerprint imaging module can enlarge the scope of fingerprint formation of image.

Description

Fingerprint imaging module, method and electronic equipment

Technical Field

The invention belongs to the field of pattern recognition, relates to a fingerprint imaging module, and particularly relates to a fingerprint imaging module, a fingerprint imaging method and electronic equipment.

Background

In recent times, high-screen-ratio electronic devices are becoming increasingly popular with users. For this reason, more and more manufacturers choose to use screen fingerprinting technology to maximize the screen-to-screen ratio of the device. As the important component part of screen fingerprint technique, fingerprint imaging module mainly used acquires user's fingerprint information and turns into fingerprint image with it, fingerprint image is used for subsequent fingerprint identification. However, the fingerprint imaging area of the existing fingerprint imaging module is limited by the size of the imaging element, and the large-range fingerprint imaging is difficult to realize.

Disclosure of Invention

In view of the above drawbacks of the prior art, an object of the present invention is to provide a fingerprint imaging module, a method and an electronic device, which are used to solve the problem that it is difficult to realize large-scale fingerprint imaging in the prior art.

To achieve the above and other related objects, a first aspect of the present invention provides a fingerprint imaging module. Fingerprint formation of image module includes: a substrate; one side of the substrate is used for placing finger fingerprints; the luminous layer is arranged on one side of the substrate, which is far away from the finger, and is used for emitting first light penetrating through the substrate; the first light rays are reflected by fingers to form reflected light rays penetrating through the substrate; the transmission layer is arranged on one side of the luminous layer, which is far away from the finger, and is used for changing the transmission direction of the reflected light so as to enable the reflected light to reach the imaging element; and the imaging element is arranged on one side of the transmission layer and used for obtaining a fingerprint image according to the reflected light.

In an embodiment of the first aspect, the imaging element and the light emitting layer are disposed on the same side of the transport layer.

In an embodiment of the first aspect, the imaging element and the light emitting layer are disposed on two sides of the transmission layer.

In an embodiment of the first aspect, the substrate covers the light-emitting layer, and the substrate covers a portion of the surface of the light-emitting layer, so that a finger fingerprint can be placed on the substrate.

In an embodiment of the first aspect, the transport layer includes: the first diffraction element is arranged on one side, close to the substrate, of the transmission layer and is used for changing the transmission direction of the reflected light to form second light; the optical waveguide is arranged on one side, away from the substrate, of the first diffraction element and is used for transmitting the second light; the second diffraction element is arranged on one side, close to the imaging element, of the transmission layer and is used for changing the transmission direction of the second light to form emergent light; the imaging element obtains the fingerprint image according to the emergent ray.

In an embodiment of the first aspect, the first diffractive element is an incident grating; and/or the second diffractive element is an exit grating.

In an embodiment of the first aspect, the first diffractive element and the optical waveguide are formed by stamping or etching; and/or the second diffractive element and the optical waveguide are formed by embossing or etching.

In an embodiment of the first aspect, a size of the substrate, a size of the light emitting layer, and a size of the transmission layer are substantially the same.

In an embodiment of the first aspect, a size of the imaging element is smaller than a size of the light emitting layer.

In an embodiment of the first aspect, the first light emitted by the light emitting layer is parallel-like light.

In an embodiment of the first aspect, the imaging device is a charge coupled device sensor, a complementary metal oxide semiconductor sensor, or a quantum thin film photosensor.

A second aspect of the present invention provides a fingerprint imaging method, comprising: generating a first light; the first light penetrates through a substrate and reaches the finger fingerprint and is reflected to form a reflected light penetrating through the substrate; changing the transmission direction of the reflected light rays to enable the reflected light rays to reach an imaging element; and processing the reflected light rays by using the imaging element to obtain a fingerprint image.

A third aspect of the invention provides an electronic device, which includes the fingerprint imaging module of the invention.

As described above, the fingerprint imaging module, the fingerprint imaging method and the electronic device of the present invention have the following advantages:

the fingerprint imaging module comprises a transmission layer, wherein the transmission layer is used for transmitting the reflected light carrying the fingerprint information to the imaging element, so that no matter the finger is placed at any position of the substrate, the reflected light carrying the fingerprint information can reach the imaging element and form a fingerprint image, and the fingerprint imaging module can enlarge the range of a fingerprint imaging area and realize large-range fingerprint imaging.

Drawings

Fig. 1A is a schematic structural diagram of a fingerprint imaging module according to some embodiments.

Fig. 1B is a schematic structural diagram of a fingerprint imaging module in another embodiment.

Fig. 2A is a schematic structural diagram of a fingerprint imaging module according to an embodiment of the invention.

Fig. 2B is a schematic structural diagram of a fingerprint imaging module according to another embodiment of the invention.

Fig. 3A is a schematic structural diagram of a transmission layer of the fingerprint imaging module according to an embodiment of the invention.

Fig. 3B is a schematic structural diagram of a transmission layer of the fingerprint imaging module according to another embodiment of the invention.

Fig. 4 is a schematic diagram of diffraction orders of a diffraction grating of the fingerprint imaging module according to an embodiment of the invention.

Fig. 5A is a schematic structural diagram of a fingerprint imaging module according to another embodiment of the invention.

Fig. 5B is a schematic structural diagram of an exit grating of the fingerprint imaging module according to an embodiment of the invention.

FIG. 6 is a flowchart illustrating a fingerprint imaging method according to an embodiment of the present invention.

Description of the element reference numerals

1a fingerprint imaging module

11a light source

12a screen lower lens

13a imaging element

14a fingerprint imaging area

1b fingerprint imaging module

11b light source

12b collimating layer

13b imaging element

14b fingerprint imaging area

2 fingerprint imaging module

21 substrate

22 luminescent layer

23 transport layer

231 first diffractive element

232 optical waveguide

233 second diffractive element

24 imaging element

25 fingerprint imaging area

26 first light ray

27 reflected light

28 second light ray

29 emergent ray

41 diffraction grating

42 light ray

5 fingerprint imaging module

51 OLED screen

511 substrate

512 light emitting layer

52 transport layer

521 incident grating

522 optical waveguide

523 emergent grating

53 imaging element

54 fingerprint imaging area

55 first light ray

56 reflected light

57 second light ray

S61-S62

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

As the important component part of screen fingerprint technique, fingerprint imaging module mainly used acquires user's fingerprint information and turns into fingerprint image with it. Specifically, the user places the finger fingerprint in the fingerprint imaging area, and the fingerprint imaging module is through to the reflection light of finger transmission light in order to obtain carrying fingerprint information; the imaging element in the fingerprint imaging module is through right the reflection light that carries fingerprint information handles and can obtain user's fingerprint image. The fingerprint imaging area refers to a specific area on a screen, and when a finger fingerprint is placed in the fingerprint imaging area, reflected light rays of the fingerprint imaging area can be acquired and identified by the imaging element.

Referring to fig. 1A, in some embodiments, the fingerprint imaging module 1A is a fingerprint imaging module based on an off-screen lens, wherein: the light emitted by the light source 11a reaches the finger and is reflected to form reflected light, and the reflected light reaches the imaging element 13a through the under-screen lens 12a to form a fingerprint image. In these embodiments, the size of the fingerprint imaging area 14a depends on the size of the off-screen lens 12a and the imaging element 13 a.

Referring to fig. 1B, in other embodiments, the fingerprint imaging module 1B is a fingerprint imaging module based on a collimating layer, wherein: the light emitted by the light source 11b reaches the finger and is reflected to form reflected light, and the reflected light reaches the imaging element 13b through the collimating layer 12b to form a fingerprint image. In these embodiments, the size of the fingerprint imaging area 14b depends on the size of the collimating layer 12b and the imaging element 13 b.

In summary, the size of the fingerprint imaging area in the above embodiments is limited by the size of the imaging device, the under-screen lens or the collimating layer. To this problem, the present invention provides a fingerprint imaging module, the fingerprint imaging module includes: a substrate; one side of the substrate is used for placing finger fingerprints; the luminous layer is arranged on one side of the substrate, which is far away from the finger, and is used for emitting first light penetrating through the substrate; the first light rays are reflected by fingers to form reflected light rays penetrating through the substrate; the transmission layer is arranged on one side of the luminous layer, which is far away from the finger, and is used for changing the transmission direction of the reflected light so as to enable the reflected light to transmit the reflected light to reach the imaging element; and the imaging element is arranged on one side of the transmission layer and used for obtaining a fingerprint image according to the reflected light. The fingerprint imaging module comprises a transmission layer, wherein the transmission layer is used for transmitting the reflection light carrying the fingerprint information to the imaging element, so that no matter the fingerprint is placed at any position of the substrate, the reflection light carrying the fingerprint information can reach the imaging element and form a fingerprint image, and the fingerprint imaging module can enlarge the range of a fingerprint imaging area and realize large-range fingerprint imaging.

Referring to fig. 2A and 2B, in an embodiment of the present invention, the fingerprint imaging module 2 includes:

a substrate 21; one side of the substrate 21 is a fingerprint imaging area 25, wherein the fingerprint imaging area 25 is used for placing a finger fingerprint.

The luminous layer 22 is arranged on one side of the substrate 21 far away from the finger and is used for emitting first light 26 penetrating through the substrate; the first light ray 26 is reflected by a finger to form a reflected light ray 27 penetrating through the substrate. Due to the unevenness of the surface of the fingerprint of a person, the light paths of the first light ray 26 reaching different positions of the fingerprint are different, and the intensity and the angle of the reflected light ray 27 obtained after the reflection of the finger are different; the imaging element 24 generates an image of the user's fingerprint based on the angle and intensity of the reflected light 27. Therefore, the reflected light 27 can be considered to carry fingerprint information of the user.

A transmission layer 23 disposed on a side of the light-emitting layer away from the finger for changing a transmission direction of the reflected light 27 so that the reflected light 27 reaches the imaging element 24;

and the imaging element 24 is arranged on any side of the transmission layer 23 and is used for acquiring the fingerprint information carried by the reflected light 27 and generating a corresponding fingerprint image.

In the present embodiment, no matter where the user places a finger in the fingerprint imaging area 25, the first light 26 emitted from the light-emitting layer can reach the user's finger and generate the reflected light 27 carrying the fingerprint information, and the transmission layer 23 can transmit the reflected light 27 carrying the fingerprint information to the imaging element 24 to generate the fingerprint image of the user. Therefore, the fingerprint imaging area of the fingerprint imaging module 2 is not limited by the size of the imaging unit 24, and the large-range fingerprint imaging can be realized.

In an embodiment of the present invention, the fingerprint imaging module includes: an OLED screen, a transport layer, and an imaging element. The OLED screen comprises a substrate and a light emitting layer.

Preferably, the transport layer is located under the OLED screen. At the moment, the first light emitted by the OLED screen is reflected after reaching the fingers and forms reflected light penetrating through the substrate, and the reflected light penetrates through gaps among the sub-pixels of the OLED screen and reaches the transmission layer.

In this embodiment, by selecting the OLED screen as the substrate and the light-emitting layer, the fingerprint imaging module of this embodiment can be directly applied to the existing OLED screen device without greatly changing the device hardware, and is simple to assemble.

Referring to fig. 3A and 3B, in an embodiment of the present invention, the transmission layer 23 includes:

a first diffraction element 231, disposed on a side of the transmission layer 23 close to the substrate 21, for changing a transmission direction of the reflected light 27 to form a second light 28; specifically, the first diffraction element 231 bends the reflected light 27 by changing the optical path thereof and forms the second light 28, and the second light 28 enters the optical waveguide 232;

an optical waveguide 232 disposed on a side of the first diffractive element 231 away from the substrate 21 for transmitting the second light 28; preferably, the incident angle of the second light ray 28 is larger than the corresponding critical angle of the optical waveguide 232, when the second light ray 28 is transmitted in the optical waveguide 232 by total reflection;

a second diffractive element 233, disposed on a side of the transmission layer 23 close to the imaging element 24, for changing a transmission direction of the second light 28 to form an emergent light 29; the imaging element obtains the fingerprint image from the outgoing light rays 29. Specifically, the second diffraction element 233 bends the second light 28 by changing its optical path to form the outgoing light 29, and the outgoing light 29 exits the optical waveguide 232 and reaches the imaging element.

Preferably, the optical path of the reflected light ray 27 in the first diffractive element 231 is reciprocal to the optical path of the second light ray 23 in the second diffractive element 233. At this time, the reflected ray 27 is parallel to the emergent ray 29.

In this embodiment, the first diffractive element and the second diffractive element are adopted to cooperate with the optical waveguide to transmit the reflected light to the imaging element; the second light in the optical waveguide can be transmitted in a total reflection mode, interference and energy loss of external light are reduced, the transmission distance is increased, and therefore the fingerprint imaging module is allowed to realize large-range or even ultra-large-range imaging.

Referring to fig. 3A, in an embodiment of the invention, the imaging element 24 and the light emitting layer 22 are disposed on two sides of the transmission layer 23.

Referring to fig. 3B, in an embodiment of the invention, the imaging element 24 and the light-emitting layer 22 are disposed on the same side of the transmission layer 23.

In an embodiment of the invention, the substrate 21 covers the light-emitting layer 22, and the surface of the substrate 21 covering the light-emitting layer 22 can be used for placing a finger fingerprint. Therefore, this embodiment fingerprint imaging module can realize full-screen fingerprint formation of image.

In an embodiment of the invention, the first diffractive element is an incident grating, and/or the second diffractive element is an exit grating. The incident grating and the emergent grating are diffraction gratings and are used for carrying out spatial periodic modulation on the amplitude or the phase of light or simultaneously carrying out spatial periodic modulation on the light. In this embodiment, the incident grating diffracts the reflected light and deflects the light path of the reflected light to enter the optical waveguide; and the emergent grating diffracts the second light rays and deflects the light path of the second light rays so as to leave the optical waveguide.

FIG. 4 shows a schematic diagram of the diffraction grating portion graded diffraction. The diffraction grating 41 of fig. 4 may be used in which the first diffraction element 231 is used as an incident grating or the second diffraction element 233 is used as an exit grating. Specifically, the light 42 passes through the diffraction grating 41 to form a plurality of diffracted lights, such as: r, R-1 and R +1, etc. In practical applications, one or more light rays with specific angles can be obtained by filtering the plurality of diffracted light rays. In this embodiment, the reflected light beam passes through the incident grating to form a plurality of diffracted light beams, and one of the diffracted light beams having the highest brightness and an angle larger than the critical angle of the optical waveguide may be selected as the second light beam. Similarly, for the diffracted light formed by the exit grating, one of the diffracted light parallel to the reflected light is selected as the exit light.

In an embodiment of the invention, the first diffractive element and the optical waveguide are formed by stamping, or the second diffractive element and the optical waveguide are formed by stamping or etching. Imprinting is essentially a print replication technique, which is a technique of making large copies of a template. In this embodiment, the first diffractive element/the second diffractive element are combined with the optical waveguide in an imprinting manner, so that the thickness of the transmission layer can be reduced, and the miniaturization and the ultra-thinness of the whole module can be realized. The etching is to directly combine the first diffraction element/the second diffraction element with the optical waveguide by using a semiconductor photoetching process, so that the thickness of the transmission layer can be reduced, and the miniaturization and the ultra-thinness of the whole module can be realized.

In another embodiment of the present invention, the first diffractive element, the second diffractive element and the optical waveguide are formed by stamping or etching, which is beneficial to further reducing the thickness of the transmission layer.

In some embodiments, such as the fingerprint imaging module shown in fig. 1A and 2A, the size of the fingerprint imaging area is limited by the size of the substrate, the size of the light emitting layer, and the size of the imaging element. In these embodiments, since the size of the imaging element is often smaller than the size of the substrate and the size of the light emitting layer, the size of the fingerprint imaging area is increased only by increasing the size of the imaging element or increasing the number of the imaging elements, which is costly and difficult to assemble.

In the invention, the size of the fingerprint imaging area is limited only by the size of the substrate, the size of the light emitting layer and the size of the transmission layer due to the existence of the transmission layer, and the size of the imaging element does not limit the size of the fingerprint imaging area.

In an embodiment of the invention, the fingerprint imaging module employs an imaging element with a size smaller than that of the light emitting layer to achieve acquisition of a fingerprint image, thereby reducing production cost and assembly difficulty of the module. In the present embodiment, the dimensions refer to the length and width of the corresponding component, which is a light emitting layer, a substrate, a transfer layer, or an imaging element.

In an embodiment of the invention, the substrate, the light emitting layer and the transmission layer adopted by the fingerprint imaging module have substantially the same size. Wherein, the approximately same means that the size difference among the substrate, the light emitting layer and the transport layer is within the tolerance range allowed by the production process in the field. In practical applications, the substrate size and the light emitting layer size determine the screen size of the device, for example: for devices employing OLED screens, the screen size is typically the same as the substrate size and light emitting layer size of the OLED screen. In this embodiment, since the sizes of the substrate, the light emitting layer, and the transmission layer are substantially the same, and the size of the fingerprint imaging area is determined by the sizes of the substrate, the light emitting layer, and the transmission layer, the size of the fingerprint imaging area is substantially the same as the size of the screen of the device in this embodiment, so that the fingerprint imaging module in this embodiment can realize full-screen or quasi-full-screen fingerprint imaging, which is beneficial to meeting different fingerprint identification requirements of users.

In an embodiment of the invention, the first light emitted by the light emitting layer is parallel-like light. The quasi-parallel light means that the included angle between any two light rays in all the light rays included in the light beam is not greater than a threshold value, and the threshold value is any angle within the range of 0-15 degrees, for example.

In this embodiment, through selecting class parallel light as first light, make fingerprint imaging module can realize through common optical element such as grating, optical waveguide, has reduced fingerprint imaging module is to optical element's requirement, is favorable to simplifying production technology, promotes production efficiency.

In an embodiment of the invention, the imaging device is a charge coupled device sensor (CCD), a complementary metal oxide semiconductor sensor (CMOS) or a quantum thin film photosensor (QD). The sensitivity, the resolution and the imaging quality of the CCD are all superior to those of the CMOS, and the production cost of the CMOS is lower; QD is superior to CMOS and CCD in photoelectric conversion efficiency and is thinner in thickness. In practical application, a user can select CCD, CMOS or QD as the imaging element according to requirements. It should be noted that the imaging element is not limited to CCD, CMOS or QD, but for example, any element capable of converting the reflected light into an electrical signal to generate a fingerprint image may implement the present invention.

Referring to fig. 5A and 5B, in an embodiment of the present invention, the fingerprint imaging module 5 includes an OLED screen 51, a transmission layer 52 and an imaging element 53.

The OLED panel 51 includes a substrate 511 and a light emitting layer 512; one side of the substrate 511 is a fingerprint imaging area 54 for placing a finger fingerprint; the light emitting layer 512 is used for emitting a first light ray 55 penetrating through the substrate; the first light ray 55 is a quasi-parallel light, and is reflected to form a second light ray 56 penetrating through the substrate after reaching the finger; the reflected light 56 carries the fingerprint information of the user.

The transmission layer 52 includes an entrance grating 521, an optical waveguide 522, and an exit grating 523. Specifically, the reflected light ray 56 passes through the gap between the sub-pixels of the OLED panel 51 to reach the incident grating 521 and is diffracted to form a plurality of first diffracted light rays; selecting one of said first diffracted light rays as said second light ray 57 into an optical waveguide 522; the second light ray 57 is transmitted to the exit grating 523 in the optical waveguide 522 in a total reflection manner and is diffracted to form a plurality of second diffracted light rays; one of the plurality of second diffracted light rays, which is parallel to the incident light ray 56, is selected as an outgoing light ray to enter the imaging element 53.

The imaging element 53 processes the emergent light and generates a fingerprint image; the imaging element 53 may be a CCD, a CMOS, or a QD, among others.

In this embodiment, can effectively enlarge the regional area of fingerprint formation of image through the position and the size that set up the transmission layer rationally, so this embodiment the fingerprint formation of image module need not to enlarge the regional area of fingerprint formation of image through the size or the quantity of increase imaging element, and the cost is lower and easily realize.

Referring to fig. 6, the present invention further provides a fingerprint imaging method. The fingerprint imaging method comprises the following steps:

s61, generating a first light; the first light penetrates through a substrate and reaches the finger fingerprint and is reflected, and reflected light penetrating through the substrate is formed. Wherein, first light is a bundle of light, because fingerprint surface unevenness, the light path diverse that different light reachd the fingerprint in the first light, the reflection light angle and the intensity that different light correspond are also different. Therefore, the reflected light carries the fingerprint information of the user, and the fingerprint information of the user can be obtained by processing the reflected light.

S62, changing the transmission direction of the reflected light ray so that the reflected light ray reaches the imaging element.

And S63, processing the reflected light rays by using the imaging element to obtain a fingerprint image.

In this embodiment, no matter where the finger of the user is placed on the screen, as long as the first light ray can reach the finger of the user and form the reflected light ray, and the step S62 can transmit the reflected light ray to the imaging element, the fingerprint imaging method can realize the fingerprint imaging of the user. Therefore, the fingerprint imaging method can realize large-range fingerprint imaging without increasing the size or the number of the imaging elements, and is beneficial to meeting different imaging requirements of users.

In an embodiment of the present invention, the fingerprint imaging method is implemented by the fingerprint imaging module of the present invention. Specifically, referring to fig. 2A, the light-emitting layer 22 and the substrate 21 are used to perform step S61, that is: the light-emitting layer 22 generates a first light ray 26, and the first light ray 26 passes through the substrate 21 and reaches the surface of the finger to be reflected to form a reflected light ray 27 penetrating through the substrate. The transport layer 23 is configured to perform step S62, namely: the reflected light rays 27 are transmitted to the imaging element 24. The imaging element 24 is configured to perform step S63, namely: the reflected light rays 27 are received and processed to generate an image of the user's fingerprint.

It should be noted that the fingerprint imaging method of the present invention can be implemented by the fingerprint imaging module of the present invention, but the implementation apparatus of the fingerprint imaging method of the present invention includes but is not limited to the structure of the fingerprint imaging module of the present invention, and all the structural modifications and substitutions in the prior art made according to the principle of the present invention are included in the protection scope of the present invention.

In addition, the protection scope of the fingerprint imaging method according to the present invention is not limited to the execution sequence of the steps listed in the embodiment, and all the solutions of the prior art, including the steps addition, subtraction and step replacement according to the principle of the present invention, are included in the protection scope of the present invention.

Based on the description of the fingerprint imaging module, the invention further provides electronic equipment. The electronic equipment comprises the fingerprint imaging module. The electronic device includes but is not limited to a mobile phone, a PAD, a notebook computer, etc.

The fingerprint imaging module comprises a transmission layer, wherein the transmission layer is used for transmitting the reflected light carrying the fingerprint information to an imaging element, so that no matter a finger is placed at any position of a substrate, the reflected light carrying the fingerprint information can reach the imaging element and form a fingerprint image, and the fingerprint imaging module can enlarge the range of a fingerprint imaging area and realize large-range fingerprint imaging; it is much less costly than other methods of enlarging the imaging field by increasing the size or number of imaging elements.

Fingerprint imaging module can be based on current OLED screen and realize, OLED screen self can be luminous, so fingerprint imaging module also need not external light source. Therefore, the fingerprint imaging module is simple to assemble and low in assembly difficulty.

In the fingerprint imaging module, the incident grating, the optical waveguide and the emergent grating can be formed by stamping, and the light-emitting layer and the substrate can be realized by an OLED (organic light emitting diode) screen of a mobile phone, so that the fingerprint imaging module can be ultrathin, the whole module is miniaturized, and the fingerprint imaging module is more suitable for market demands;

in conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (13)

1. The utility model provides a fingerprint imaging module, its characterized in that, fingerprint imaging module includes:

a substrate; one side of the substrate is used for placing finger fingerprints;

the luminous layer is arranged on one side of the substrate, which is far away from the finger, and is used for emitting first light penetrating through the substrate; the first light rays are reflected by fingers to form reflected light rays penetrating through the substrate;

the transmission layer is arranged on one side of the luminous layer, which is far away from the finger, and is used for changing the transmission direction of the reflected light so as to enable the reflected light to reach the imaging element;

and the imaging element is arranged on one side of the transmission layer and used for obtaining a fingerprint image according to the reflected light.

2. The fingerprint imaging module of claim 1, wherein: the imaging element and the light-emitting layer are disposed on the same side of the transport layer.

3. The fingerprint imaging module of claim 1, wherein: the imaging element and the light emitting layer are disposed on both sides of the transport layer.

4. The fingerprint imaging module of claim 1, wherein: the substrate covers the light-emitting layer, covers the surface of the light-emitting layer, and can be used for placing finger fingerprints.

5. The fingerprint imaging module of claim 1, wherein the transmission layer comprises:

the first diffraction element is arranged on one side, close to the substrate, of the transmission layer and is used for changing the transmission direction of the reflected light to form second light;

the optical waveguide is arranged on one side, away from the substrate, of the first diffraction element and is used for transmitting the second light;

the second diffraction element is arranged on one side, close to the imaging element, of the transmission layer and is used for changing the transmission direction of the second light to form emergent light; the imaging element obtains the fingerprint image according to the emergent ray.

6. The fingerprint imaging module of claim 5, wherein: the first diffraction element is an incident grating; and/or the second diffractive element is an exit grating.

7. The fingerprint imaging module of claim 5, wherein:

the first diffraction element and the optical waveguide are formed by stamping or etching; and/or

The second diffractive element and the optical waveguide are formed by embossing or etching.

8. The fingerprint imaging module of claim 1, wherein: the size of the substrate, the size of the light emitting layer, and the size of the transport layer are substantially the same.

9. The fingerprint imaging module of claim 1, wherein: the size of the imaging element is smaller than the size of the light emitting layer.

10. The fingerprint imaging module of claim 1, wherein: the first light rays emitted by the luminous layer are parallel-like light.

11. The fingerprint imaging module of claim 1, wherein: the imaging element is a charge coupled element sensor, a complementary metal oxide semiconductor sensor or a quantum thin film photoelectric sensor.

12. A fingerprint imaging method, characterized in that the fingerprint imaging method comprises:

generating a first light; the first light penetrates through a substrate and reaches the finger fingerprint and is reflected to form a reflected light penetrating through the substrate;

changing the transmission direction of the reflected light rays to enable the reflected light rays to reach an imaging element;

and processing the reflected light rays by using the imaging element to obtain a fingerprint image.

13. An electronic device, characterized in that: the electronic device comprises the fingerprint imaging module of any one of claims 1 to 11.

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