Fingerprint imaging module, method and electronic device

Abstract

The present invention provides a fingerprint imaging module, method and electronic device. The fingerprint imaging module comprises: a substrate; one side of the substrate is used to place a fingerprint of a finger; a light-emitting layer, arranged on the side of the substrate away from the finger, for emitting a first light penetrating the substrate; the first light is reflected by the finger to form a reflected light penetrating the substrate; a transmission layer, arranged on the side of the light-emitting layer away from the finger, for transmitting the reflected light to an imaging element; an imaging element, arranged on one side of the transmission layer, for obtaining a fingerprint image according to the reflected light. The fingerprint imaging module can expand the range of fingerprint imaging.

Description

Technical Field

[0001] The present invention belongs to the field of pattern recognition, and relates to a fingerprint imaging module, and in particular to a fingerprint imaging module, a method and an electronic device. Background Art

[0002] Recently, electronic devices with high screen-to-body ratio have gradually become popular among users. For this reason, more and more manufacturers choose to adopt screen fingerprint technology to maximize the screen-to-body ratio of the device. As an important part of screen fingerprint technology, the fingerprint imaging module is mainly used to obtain the user's fingerprint information and convert it into a fingerprint image, which is used for subsequent fingerprint recognition. However, the fingerprint imaging area of ​​the existing fingerprint imaging module is limited by the size of the imaging element, and it is difficult to achieve large-scale fingerprint imaging. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a fingerprint imaging module, method and electronic device to solve the problem that the prior art is difficult to achieve large-scale fingerprint imaging.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the first aspect of the present invention provides a fingerprint imaging module. The fingerprint imaging module includes: a substrate; one side of the substrate is used to place the fingerprint of the finger; a light-emitting layer, which is arranged on the side of the substrate away from the finger, and is used to emit a first light that penetrates the substrate; the first light is reflected by the finger to form a reflected light that penetrates the substrate; a transmission layer, which is arranged on the side of the light-emitting layer away from the finger, and is used to change the transmission direction of the reflected light so that the reflected light reaches the imaging element; an imaging element, which is arranged on one side of the transmission layer, and is used to obtain a fingerprint image according to the reflected light.

[0005] In an embodiment of the first aspect, the imaging element and the light emitting layer are disposed on the same side of the transmission layer.

[0006] In an embodiment of the first aspect, the imaging element and the light emitting layer are disposed on both sides of the transmission layer.

[0007] In an embodiment of the first aspect, the substrate completely covers the light-emitting layer, and the surface of the portion of the substrate covering the light-emitting layer can be used for placing a fingerprint.

[0008] In an embodiment of the first aspect, the transmission layer includes: a first diffraction element, which is arranged on a side of the transmission layer close to the substrate, and is used to change the transmission direction of the reflected light to form a second light; an optical waveguide, which is arranged on a side of the first diffraction element away from the substrate, and is used to transmit the second light; a second diffraction element, which is arranged on a side of the transmission layer close to the imaging element, and is used to change the transmission direction of the second light to form an outgoing light; and the imaging element obtains the fingerprint image according to the outgoing light.

[0009] In an embodiment of the first aspect, the first diffraction element is an incident grating; and / or the second diffraction element is an exit grating.

[0010] In an embodiment of the first aspect, the first diffraction element and the optical waveguide are formed by embossing or etching; and / or the second diffraction element and the optical waveguide are formed by embossing or etching.

[0011] 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.

[0012] In an embodiment of the first aspect, a size of the imaging element is smaller than a size of the light-emitting layer.

[0013] In an embodiment of the first aspect, the first light emitted by the light-emitting layer is quasi-parallel light.

[0014] In an embodiment of the first aspect, the imaging element is a charge coupled device sensor, a complementary metal oxide semiconductor sensor or a quantum thin film photoelectric sensor.

[0015] The second aspect of the present invention provides a fingerprint imaging method, which includes: generating a first light; the first light penetrates a substrate and reaches the fingerprint of the finger and is reflected to form a reflected light that penetrates the substrate; changing the transmission direction of the reflected light so that the reflected light reaches an imaging element; and using the imaging element to process the reflected light to obtain a fingerprint image.

[0016] A third aspect of the present invention provides an electronic device, comprising the fingerprint imaging module of the present invention.

[0017] As described above, the fingerprint imaging module, method and electronic device of the present invention have the following beneficial effects:

[0018] The fingerprint imaging module includes a transmission layer, which is used to transmit the reflected light carrying fingerprint information to the imaging element. Therefore, no matter where the finger is placed on the substrate, the reflected light carrying fingerprint information can reach the imaging element and form a fingerprint image. Therefore, the fingerprint imaging module of the present invention can expand the range of the fingerprint imaging area and realize large-scale fingerprint imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A Shown is a schematic diagram of the structure of a fingerprint imaging module in some embodiments.

[0020] Figure 1B Shown are structural schematic diagrams of fingerprint imaging modules in other embodiments.

[0021] Figure 2A Shown is a schematic structural diagram of the fingerprint imaging module of the present invention in a specific embodiment.

[0022] Figure 2B Shown is a schematic structural diagram of the fingerprint imaging module of the present invention in another specific embodiment.

[0023] Figure 3A Shown is a schematic structural diagram of a transmission layer of the fingerprint imaging module of the present invention in a specific embodiment.

[0024] Figure 3B Shown is a schematic structural diagram of a transmission layer of the fingerprint imaging module of the present invention in another specific embodiment.

[0025] Figure 4 FIG. 4 is a schematic diagram showing a portion of diffraction orders of a diffraction grating in a specific embodiment of the fingerprint imaging module of the present invention.

[0026] Figure 5A Shown is a schematic structural diagram of the fingerprint imaging module of the present invention in another specific embodiment.

[0027] Figure 5B Shown is a schematic structural diagram of an output grating of a fingerprint imaging module according to a specific embodiment of the present invention.

[0028] Figure 6 Shown is a flow chart of a fingerprint imaging method according to a specific embodiment of the present invention.

[0029] Component number description

[0030] 1a Fingerprint imaging module

[0031] 11a Light Source

[0032] 12a Under-screen camera

[0033] 13a Imaging element

[0034] 14a Fingerprint imaging area

[0035] 1b Fingerprint imaging module

[0036] 11b Light Source

[0037] 12b Collimation layer

[0038] 13b Imaging element

[0039] 14b Fingerprint imaging area

[0040] 2 Fingerprint imaging module

[0041] 21 substrate

[0042] 22 Luminous layer

[0043] 23 Transport Layer

[0044] 231 First diffraction element

[0045] 232 Optical waveguide

[0046] 233 Second diffraction element

[0047] 24 Imaging element

[0048] 25 Fingerprint imaging area

[0049] 26 First Light

[0050] 27 Reflected Light

[0051] 28 Second Ray

[0052] 29 Outgoing light

[0053] 41 Diffraction grating

[0054] 42 Light

[0055] 5 Fingerprint imaging module

[0056] 51 OLED screen

[0057] 511 base plate

[0058] 512 Luminous Layer

[0059] 52 Transport Layer

[0060] 521 incident grating

[0061] 522 Optical waveguide

[0062] 523 Exit Grating

[0063] 53 Imaging element

[0064] 54 Fingerprint imaging area

[0065] 55 First Light

[0066] 56 Reflected Light

[0067] 57 Second Ray

[0068] Steps S61 to S62 DETAILED DESCRIPTION

[0069] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0070] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0071] As an important part of screen fingerprint technology, the fingerprint imaging module is mainly used to obtain the user's fingerprint information and convert it into a fingerprint image. Specifically, the user places the fingerprint of the finger on the fingerprint imaging area, and the fingerprint imaging module emits light to the finger to obtain the reflected light carrying the fingerprint information; the imaging element in the fingerprint imaging module processes the reflected light carrying the fingerprint information to obtain the user's fingerprint image. The fingerprint imaging area refers to a specific area on the screen. When the fingerprint of the finger is placed in the fingerprint imaging area, its reflected light can be obtained and recognized by the imaging element.

[0072] See also Figure 1A In some embodiments, the fingerprint imaging module 1a is a fingerprint imaging module based on an under-screen lens, wherein: the light emitted by the light source 11a is reflected after reaching the finger and forms a reflected light, and the reflected light forms a fingerprint image after reaching the imaging element 13a through the under-screen lens 12a. In these embodiments, the size of the fingerprint imaging area 14a depends on the size of the under-screen lens 12a and the imaging element 13a.

[0073] See also Figure 1BIn 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 is reflected after reaching the finger and forms a reflected light, and the reflected light reaches the imaging element 13b after passing 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 13b.

[0074] In summary, in the above embodiments, the size of the fingerprint imaging area is limited by the size of the imaging element, the under-screen lens or the collimating layer. In response to this problem, the present invention provides a fingerprint imaging module, which includes: a substrate; one side of the substrate is used to place the fingerprint of the finger; a light-emitting layer, which is arranged on the side of the substrate away from the finger, and is used to emit a first light that penetrates the substrate; the first light is reflected by the finger to form a reflected light that penetrates the substrate; a transmission layer, which is arranged on the side of the light-emitting layer away from the finger, and is used to change the transmission direction of the reflected light so that the reflected light is transmitted to the imaging element; the imaging element is arranged on one side of the transmission layer, and is used to obtain a fingerprint image according to the reflected light. The fingerprint imaging module of the present invention includes a transmission layer, and the transmission layer is used to transmit the reflected light carrying fingerprint information to the imaging element. Therefore, no matter where the fingerprint of the finger is placed on the substrate, the reflected light carrying the fingerprint information can reach the imaging element and form a fingerprint image. Therefore, the fingerprint imaging module of the present invention can expand the range of the fingerprint imaging area and realize a large range of fingerprint imaging.

[0075] See also Figure 2A and Figure 2B In one embodiment of the present invention, the fingerprint imaging module 2 includes:

[0076] A substrate 21; one side of the substrate 21 is a fingerprint imaging area 25, wherein the fingerprint imaging area 25 is used to place a finger fingerprint.

[0077] The light emitting layer 22 is disposed on the side of the substrate 21 away from the finger, and is used to emit a first light 26 that penetrates the substrate; the first light 26 is reflected by the finger to form a reflected light 27 that penetrates the substrate. Since the surface of a person's fingerprint is uneven, the optical paths of the first light 26 to different positions of the fingerprint are different, and the intensity and angle of the reflected light 27 obtained after being reflected by the finger are also different; the imaging element 24 can generate the user's fingerprint image according to the angle and intensity of the reflected light 27. Therefore, it can be considered that the reflected light 27 carries the user's fingerprint information.

[0078] The transmission layer 23 is disposed on a side of the light emitting layer away from the finger, and is used to change the transmission direction of the reflected light 27 so that the reflected light 27 reaches the imaging element 24;

[0079] The imaging element 24 is disposed on either side of the transmission layer 23 and is used to obtain the fingerprint information carried by the reflected light 27 and generate a corresponding fingerprint image.

[0080] In this embodiment, no matter where the user places the finger in the fingerprint imaging area 25, the first light 26 emitted by the light emitting layer can reach the user's finger and generate a reflected light 27 carrying fingerprint information, and the transmission layer 23 can transmit the reflected light 27 carrying fingerprint information to the imaging element 24 to generate the user's fingerprint image. Therefore, the fingerprint imaging area of ​​the fingerprint imaging module 2 in this embodiment is not limited by the size of the imaging unit 24, and a wide range of fingerprint imaging can be achieved.

[0081] In one embodiment of the present invention, the fingerprint imaging module comprises: an OLED screen, a transmission layer and an imaging element. The OLED screen comprises a substrate and a light-emitting layer.

[0082] Preferably, the transmission layer is located under the OLED screen. At this time, the first light emitted by the OLED screen is reflected after reaching the finger and forms a reflected light penetrating the substrate, and the reflected light passes through the gaps between the sub-pixels of the OLED screen to reach the transmission layer.

[0083] In this embodiment, by selecting an OLED screen as the substrate and the light-emitting layer, the fingerprint imaging module of this embodiment can be directly applied to existing OLED screen devices without major changes to the device hardware, and the assembly is simple.

[0084] See also Figure 3A and Figure 3B In one embodiment of the present invention, the transmission layer 23 includes:

[0085] A first diffraction element 231 is disposed on a side of the transmission layer 23 close to the substrate 21, and is used to change the transmission direction of the reflected light 27 to form a second light 28. Specifically, the first diffraction element 231 changes the optical path of the reflected light 27 to bend the reflected light 27 and form the second light 28, and the second light 28 enters the optical waveguide 232.

[0086] An optical waveguide 232 is disposed on a side of the first diffraction element 231 away from the substrate 21, and is used to transmit the second light 28; preferably, the incident angle of the second light 28 is greater than the corresponding critical angle of the optical waveguide 232, and at this time, the second light 28 is transmitted in the optical waveguide 232 in a total reflection manner;

[0087] The second diffraction element 233 is disposed on a side of the transmission layer 23 close to the imaging element 24, and is used to change the transmission direction of the second light 28 to form an outgoing light 29; the imaging element obtains the fingerprint image according to the outgoing light 29. Specifically, the second diffraction element 233 bends the second light 28 by changing the optical path of the second light 28 to form the outgoing light 29, and the outgoing light 29 leaves the optical waveguide 232 and reaches the imaging element.

[0088] Preferably, the optical path of the reflected light 27 in the first diffraction element 231 is opposite to the optical path of the second light 23 in the second diffraction element 233. At this time, the reflected light 27 is parallel to the emitted light 29.

[0089] In this embodiment, the reflected light is transmitted to the imaging element by using the first diffraction element and the second diffraction element in conjunction with the optical waveguide; wherein the second light in the optical waveguide can be transmitted in a total reflection manner, which is beneficial to reduce interference and energy loss from external light and increase the transmission distance, thereby allowing the fingerprint imaging module to achieve large-range or even ultra-large-range imaging.

[0090] See also Figure 3A In one embodiment of the present invention, the imaging element 24 and the light emitting layer 22 are disposed on both sides of the transmission layer 23 .

[0091] See also Figure 3B In one embodiment of the present invention, the imaging element 24 and the light emitting layer 22 are arranged on the same side of the transmission layer 23 .

[0092] In one embodiment of the present invention, the substrate 21 completely covers the light emitting layer 22, and the surface of the substrate 21 covering the light emitting layer 22 can be used to place fingerprints. Therefore, the fingerprint imaging module of this embodiment can achieve full-screen fingerprint imaging.

[0093] In one embodiment of the present invention, the first diffraction element is an incident grating, and / or the second diffraction element is an exit grating. The incident grating and the exit grating are both diffraction gratings, which are used to perform spatial periodic modulation on the amplitude or phase of the light, or to perform spatial periodic modulation on the light simultaneously. In this embodiment, the incident grating performs diffraction processing on the reflected light so that the light path is deflected so that the reflected light enters the optical waveguide; the exit grating performs diffraction processing on the second light so that the light path is deflected so that the reflected light leaves the optical waveguide.

[0094] See also Figure 4 , which is a schematic diagram of partial diffraction of a diffraction grating. Figure 4The diffraction grating 41 can be used for the above-mentioned first diffraction element 231 as an incident grating, or the above-mentioned second diffraction element 233 as an exit grating. Specifically, after the light 42 passes through the diffraction grating 41, a plurality of diffraction light rays are formed, for example: R, R-1 and R+1, etc. In practical applications, one or more light rays of a specific angle can be obtained by filtering the plurality of diffraction light rays. In this embodiment, after the reflected light passes through the incident grating, a plurality of diffraction light rays are formed, and a diffraction light ray with the highest brightness and an angle greater than the critical angle of the optical waveguide can be selected as the second light ray. Similarly, for the diffraction light rays formed by the exit grating, a diffraction light ray parallel to the reflected light ray is selected as the exit light ray.

[0095] In one embodiment of the present invention, the first diffraction element and the optical waveguide are formed by embossing, or the second diffraction element and the optical waveguide are formed by embossing or etching. Imprinting is essentially a printing replication technology, which is a technology for mass replication of a template. In this embodiment, the first diffraction element / the second diffraction element is combined with the optical waveguide by embossing, which can reduce the thickness of the transmission layer, which is conducive to the miniaturization and ultra-thinness of the overall module. Etching is to directly combine the first diffraction element / the second diffraction element with the optical waveguide by semiconductor photolithography technology, which can also reduce the thickness of the transmission layer, which is conducive to the miniaturization and ultra-thinness of the overall module.

[0096] In another embodiment of the present invention, the first diffraction element, the second diffraction element and the optical waveguide are all formed by embossing or etching, which is beneficial to further reduce the thickness of the transmission layer.

[0097] In some embodiments, for example Figure 1A and Figure 2A In the fingerprint imaging module shown, 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 can only be increased by increasing the size of the imaging element or increasing the number of imaging elements, which is costly and difficult to assemble.

[0098] In the present invention, due to the existence of the transmission layer, the size of the fingerprint imaging area is only limited by the size of the substrate, the size of the light-emitting layer and the size of the transmission layer, and the size of the imaging element does not limit the size of the fingerprint imaging area.

[0099] In one embodiment of the present invention, the fingerprint imaging module uses an imaging element whose size is smaller than that of the light-emitting layer to achieve fingerprint image acquisition, thereby reducing the production cost and assembly difficulty of the module. In this embodiment, the size refers to the length and width of the corresponding component, and the corresponding component is the light-emitting layer, substrate, transmission layer or imaging element.

[0100] In one embodiment of the present invention, the substrate, light-emitting layer and transmission layer used in the fingerprint imaging module are of approximately the same size. Wherein, the approximately the same means that the size difference between the substrate, the light-emitting layer and the transmission layer is within the error range allowed by the production process in this field. In practical applications, the size of the substrate and the size of the light-emitting layer determine the screen size of the device. For example, for a device using an OLED screen, the screen size is usually the same as the substrate size and the 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 approximately 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 in this embodiment is approximately the same as the screen size of the device. Therefore, the fingerprint imaging module in this embodiment can achieve full-screen or quasi-full-screen fingerprint imaging, which is conducive to meeting the different fingerprint recognition needs of users.

[0101] In one embodiment of the present invention, the first light emitted by the light emitting layer is quasi-parallel light, which means that the angle between any two light rays in the light beam is not greater than a threshold value, such as any angle within the range of 0 to 15 degrees.

[0102] In this embodiment, by selecting quasi-parallel light as the first light, the fingerprint imaging module can be realized by common optical elements such as gratings and optical waveguides, which reduces the requirements of the fingerprint imaging module for optical elements, helps to simplify the production process and improve production efficiency.

[0103] In one embodiment of the present invention, the imaging element is a charge coupled device sensor (CCD), a complementary metal oxide semiconductor sensor (CMOS) or a quantum thin film photoelectric sensor (QD). Among them, the sensitivity, resolution and imaging quality of CCD are better than those of CMOS, and the production cost of CMOS is lower; the photoelectric conversion efficiency of QD is better than that of CMOS and CCD, and its thickness is thinner. In practical applications, users can choose CCD, CMOS or QD as the imaging element according to their needs. It should be noted that the imaging element is not limited to CCD, CMOS or QD, and any element that can convert the reflected light into an electrical signal and then generate a fingerprint image can implement the present invention.

[0104] See also Figure 5A and Figure 5BIn one embodiment of the present invention, the fingerprint imaging module 5 includes an OLED screen 51 , a transmission layer 52 and an imaging element 53 .

[0105] The OLED screen 51 includes a substrate 511 and a light-emitting layer 512; wherein, one side of the substrate 511 is a fingerprint imaging area 54 for placing a fingerprint; the light-emitting layer 512 is used to emit a first light 55 that penetrates the substrate; the first light 55 is a quasi-parallel light, which is reflected after reaching the finger to form a second light 56 ​​that penetrates the substrate; the reflected light 56 ​​carries the user's fingerprint information.

[0106] The transmission layer 52 includes an incident grating 521, an optical waveguide 522, and an exit grating 523. Specifically, the reflected light 56 ​​passes through the gaps between the sub-pixels of the OLED screen 51 to reach the incident grating 521 and diffract to form a plurality of first diffracted light rays; one of the first diffracted light rays is selected as the second light 57 to enter the optical waveguide 522; the second light 57 is transmitted to the exit grating 523 in the optical waveguide 522 by total reflection and diffracts to form a plurality of second diffracted light rays; one of the plurality of second diffracted light rays parallel to the incident light 56 ​​is selected as the exit light to enter the imaging element 53.

[0107] The imaging element 53 processes the outgoing light and generates a fingerprint image; wherein the imaging element 53 may be a CCD, a CMOS or a QD.

[0108] In this embodiment, the area of ​​the fingerprint imaging region can be effectively expanded by reasonably setting the position and size of the transmission layer. Therefore, the fingerprint imaging module described in this embodiment does not need to expand the area of ​​the fingerprint imaging region by increasing the size or number of imaging elements, and is low in cost and easy to implement.

[0109] See also Figure 6 The present invention also provides a fingerprint imaging method. The fingerprint imaging method comprises:

[0110] S61, generate a first light; the first light penetrates a substrate and reaches the fingerprint of the finger and is reflected to form a reflected light that penetrates the substrate. The first light is a beam of light. Due to the uneven surface of the fingerprint, the optical paths of different light rays in the first light to reach the fingerprint are different, and the reflected light angles and intensities corresponding to different light rays are also different. Therefore, the reflected light carries the user's fingerprint information, and the user's fingerprint information can be obtained by processing the reflected light.

[0111] S62, changing the transmission direction of the reflected light so that the reflected light reaches the imaging element.

[0112] S63: Process the reflected light by using the imaging element to obtain a fingerprint image.

[0113] In this embodiment, no matter where the user's finger is placed on the screen, as long as the first light can reach the user's finger and form the reflected light, and step S62 can transmit the reflected light to the imaging element, the fingerprint imaging method can realize the user's fingerprint imaging. Therefore, the fingerprint imaging method of this embodiment can realize large-scale fingerprint imaging without increasing the size or number of the imaging element, which is conducive to meeting the different imaging needs of users.

[0114] In one embodiment of the present invention, the fingerprint imaging method is implemented by the fingerprint imaging module of the present invention. Figure 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 26, and the first light 26 passes through the substrate 21 and reaches the finger surface to be reflected and forms a reflected light 27 that penetrates the substrate. The transmission layer 23 is used to perform step S62, that is, to transmit the reflected light 27 to the imaging element 24. The imaging element 24 is used to perform step S63, that is, to receive the reflected light 27 and process it to generate a fingerprint image of the user.

[0115] It should be noted that the fingerprint imaging method described in the present invention can be implemented by the fingerprint imaging module described in the present invention, but the implementation device of the fingerprint imaging method described in the present invention includes but is not limited to the structure of the fingerprint imaging module described in the present invention. All structural deformations and replacements of the prior art made according to the principles of the present invention are included in the protection scope of the present invention.

[0116] In addition, the protection scope of the fingerprint imaging method described in the present invention is not limited to the execution order of the steps listed in this embodiment. All solutions implemented by adding, reducing or replacing steps in the prior art based on the principles of the present invention are included in the protection scope of the present invention.

[0117] Based on the above description of the fingerprint imaging module, the present invention further provides an electronic device. The electronic device includes the fingerprint imaging module of the present invention. The electronic device includes but is not limited to a mobile phone, a PAD, a notebook computer, etc.

[0118] The fingerprint imaging module of the present invention includes a transmission layer, which is used to transmit the reflected light carrying fingerprint information to the imaging element. Therefore, no matter where the finger is placed on the substrate, the reflected light carrying the fingerprint information can reach the imaging element and form a fingerprint image. Therefore, the fingerprint imaging module of the present invention can expand the range of the fingerprint imaging area and realize a large range of fingerprint imaging; compared with other methods of expanding the imaging range by increasing the size or number of imaging elements, the cost is lower.

[0119] The fingerprint imaging module can be realized based on the existing OLED screen, and the OLED screen can emit light by itself, so the fingerprint imaging module does not need an external light source. Therefore, the fingerprint imaging module of the present invention is easy to assemble and has low assembly difficulty.

[0120] In the fingerprint imaging module, the incident grating, the optical waveguide and the exit grating can be formed by embossing, and the light-emitting layer and the substrate can be realized by using the OLED screen of the mobile phone, so the fingerprint imaging module can be ultra-thin, and the overall module is miniaturized, which is more suitable for market demand;

[0121] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0122] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A fingerprint imaging module, It is characterized in that The fingerprint imaging module comprises: A substrate, one side of which is used to place a fingerprint; A light emitting layer, arranged on a side of the substrate away from the finger, for emitting a first light penetrating the substrate, wherein the first light is reflected by the finger to form a reflected light penetrating the substrate; A transmission layer, disposed on a side of the light-emitting layer away from the finger, for changing a transmission direction of the reflected light so that the reflected light reaches the imaging element; An imaging element is arranged on one side of the transmission layer, and is used to obtain a fingerprint image according to the reflected light, wherein the transmission layer comprises: A first diffraction element is disposed on a side of the transmission layer close to the substrate, and is used to change the transmission direction of the reflected light to form a second light; an optical waveguide, disposed on a side of the first diffraction element away from the substrate, and configured to transmit the second light; a second diffraction element, disposed on a side of the transmission layer close to the imaging element, for changing the transmission direction of the second light to form an outgoing light, The imaging element obtains the fingerprint image according to the emergent light.

2. According to the fingerprint imaging module of claim 1, Features: The imaging element and the light emitting layer are arranged on the same side of the transmission layer.

3. According to the fingerprint imaging module of claim 1, Features: The imaging element and the light emitting layer are arranged on both sides of the transmission layer.

4. The fingerprint imaging module according to claim 1, Features: The substrate completely covers the light-emitting layer, and the surface of the part where the substrate covers the light-emitting layer can be used for placing fingerprints.

5. The fingerprint imaging module according to claim 1, Features: The first diffraction element is an incident grating; and / or The second diffraction element is an exit grating.

6. The fingerprint imaging module according to claim 1, Features: The first diffraction element and the optical waveguide are formed by embossing or etching; and / or The second diffraction element and the optical waveguide are formed by printing or etching.

7. The fingerprint imaging module according to claim 1, Features: The size of the substrate, the size of the light-emitting layer and the size of the transmission layer are substantially the same.

8. The fingerprint imaging module according to claim 1, Features: The size of the imaging element is smaller than that of the light emitting layer.

9. The fingerprint imaging module according to claim 1, Features: The first light emitted by the light-emitting layer is quasi-parallel light.

10. The fingerprint imaging module according to claim 1, Features: The imaging element is a charge coupled device sensor, a complementary metal oxide semiconductor sensor or a quantum thin film photoelectric sensor.

11. A fingerprint imaging method, It is characterized in that The fingerprint imaging method comprises: Generate a first light, the first light passes through a substrate, reaches the fingerprint and is reflected to form a reflected light that passes through the substrate; Changing the transmission direction of the reflected light through the transmission layer so that the reflected light reaches the imaging element; Processing the reflected light by the imaging element to obtain a fingerprint image, The transport layer includes: A first diffraction element is disposed on a side of the transmission layer close to the substrate, and is used to change the transmission direction of the reflected light to form a second light; an optical waveguide, disposed on a side of the first diffraction element away from the substrate, and configured to transmit the second light; a second diffraction element, disposed on a side of the transmission layer close to the imaging element, for changing the transmission direction of the second light to form an outgoing light, The fingerprint image is obtained by utilizing the imaging element according to the emergent light.

12. An electronic device, Features: The electronic device comprises the fingerprint imaging module according to any one of claims 1 to 10.

Images