CN112399040B

CN112399040B - Sub-view field imaging module and terminal equipment

Info

Publication number: CN112399040B
Application number: CN201910759072.7A
Authority: CN
Inventors: 王曙光
Original assignee: Vkansee Beijing Technology Co ltd
Current assignee: Vkansee Beijing Technology Co ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2023-07-14
Anticipated expiration: 2039-08-16
Also published as: CN112399040A

Abstract

The embodiment of the application discloses divide visual field imaging module and terminal equipment, include: a prism and at least two imaging modules; the prism is positioned above the at least two imaging modules and is used for adjusting the direction of light rays emitted from the prism to be vertical to the at least two imaging modules; and a lens group is arranged between the prism and at least two imaging modules and used for converging the object field light rays to the corresponding imaging modules respectively. Via the prism faces with different angles, the view field light rays in different directions are respectively adjusted into vertical light rays, and then the vertical light rays are respectively injected into the corresponding imaging modules for imaging. Each prism for adjusting light corresponds to one sub-field area, and each sub-field area corresponds to one imaging module. The target object is divided into a plurality of sub-fields to be imaged on the corresponding imaging modules respectively, and finally the partial images of the target object obtained on the imaging modules are spliced into a complete target object image through image processing.

Description

Sub-view field imaging module and terminal equipment

Technical Field

The application relates to the technical field of display screens, in particular to a split-view field imaging module and terminal equipment.

Background

The existing mobile terminals, such as mobile phones, are expected to achieve comprehensive screen design, and fingerprint identification and a front camera are integrated under a display screen without affecting display. There are techniques in the prior art for integrating fingerprint recognition under a display screen, for example, a matrix type small-aperture imaging system (Matrix Pinhole Imaging System, MAPIS) is proposed in the prior patent CN201710086890.6 for closely capturing object surface images, such as fingerprint images, face images, etc. MAPIS can be applied to various electronic devices such as mobile phones, tablet computers, smart bracelets and the like.

MAPIS generally includes a small aperture plate and an image sensor. A plurality of imaging holes are formed in the small hole plate. The image sensor is disposed at one side of the small aperture plate and corresponds to the position of the imaging aperture. Thus, according to the principle of small hole imaging, light on the object on the other side of the small hole plate can pass through the imaging hole to form an inverted image of the object on the image sensor. The light passing through each imaging aperture can form a corresponding image on the image sensor, and a relatively complete image of the target object can be obtained by stitching the plurality of images.

However, since the transmittance of the imaging aperture is limited, the intensity of light passing through the imaging aperture is reduced, and is difficult to be received by the image sensor, and is easily submerged in thermal noise of the image sensor.

Disclosure of Invention

The application provides a divide visual field imaging module and terminal equipment to solve above-mentioned technical problem.

In its own right, the first aspect discloses a split-field imaging module, comprising: a prism 1 and at least two imaging modules 2;

the prism 1 is positioned above the at least two imaging modules 2, and the prism 1 is used for adjusting the direction of light rays emitted from the prism 1 to be perpendicular to the at least two imaging modules 2;

and a lens group 3 is arranged between the prism 1 and the at least two imaging modules 2, and the lens group 3 is used for converging object field light rays onto the corresponding imaging modules 2 respectively.

Further, each imaging module 2 corresponds to an image sensor.

Further, all the imaging modules 2 correspond to one image sensor.

Further, the lens group 3 includes at least one of the following three: each of the imaging modules 2 corresponds to one of the fresnel zone plates, or fresnel lenses or convex lenses.

Further, each imaging module 2 corresponds to three image sensors for receiving red light, green light and blue light, respectively.

Further, the lens group 3 includes at least one of the following three: and each image sensor corresponds to one Fresnel zone plate, or Fresnel lens or convex lens.

Further, a field stop 4 is disposed between two adjacent imaging modules 2.

Further, the prism 1 adopts a micro-scale prism film or a nano-scale prism film.

Further, the number of the imaging modules 2 is three.

In a second aspect, a terminal device is disclosed, including a display screen 5 and the split-field imaging module, an intra-screen micropore matrix 6 is disposed in the display screen 5, and the split-field imaging module is located below the intra-screen micropore matrix 6.

The application provides a divide visual field imaging module and terminal equipment, the effect of prism 1 is the light of the different visual field angles of adjustment and is perpendicular light, and the effect of lens group 3 is with the visual field light that corresponds with every imaging module 2 assemble on the imaging module 2 that corresponds to obtain clear image. According to the number of the imaging modules 2 and the positions where the imaging modules 2 are arranged, the structure of the prism 1 is determined, view field light rays in different directions are respectively adjusted to vertical light rays through prism faces in different angles of the prism 1, and then the vertical light rays are respectively injected into the corresponding imaging modules 2 for imaging. Each prism 1 for adjusting light corresponds to one sub-field area, and each sub-field area corresponds to one imaging module 2. The object is divided into a plurality of sub-fields to be imaged on the corresponding imaging modules 2 respectively, and finally the partial images of the object acquired on the imaging modules 2 are spliced into a complete object image through image processing.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a split-field imaging module disclosed in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another split-field imaging module according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of another split-field imaging module according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another split-field imaging module according to an embodiment of the present disclosure;

fig. 5 is a schematic layout diagram of an image sensor in a split-field imaging module according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Description of the reference numerals

1. A prism; 2. an imaging module; 3. a lens group; 4. a field stop; 5. a display screen; 6. an in-screen microporous matrix; 7. and (5) sealing.

Detailed Description

The embodiments of the present application are described in detail below. In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely for convenience in description, and are not meant to indicate or imply that the devices or elements being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1, in a first embodiment of the present application, a split-field imaging module is provided, including: a prism 1 and at least two imaging modules 2; the prism 1 is positioned above the at least two imaging modules 2, and the prism 1 is used for adjusting the direction of light rays emitted from the prism 1 to be perpendicular to the at least two imaging modules 2; and a lens group 3 is arranged between the prism 1 and the at least two imaging modules 2, and the lens group 3 is used for converging object field light rays onto the corresponding imaging modules 2 respectively.

The split-view imaging module of the embodiment of the application is to divide the target object into a plurality of split-view fields to respectively image on the corresponding imaging modules 2, and finally splice the partial images of the target object acquired on each imaging module 2 into a complete target object image through image processing.

The prism 1 is used for adjusting light rays with different view angles into vertical light rays, and the vertical light rays are perpendicular to the upper surface of the imaging module 2 after being emitted by the prism 1. If the object field of view is divided into a forward field of view and an oblique field of view, wherein the forward field of view refers to a field of view in which light reflected by the object is perpendicular to the horizontal direction of the imaging module 2, the oblique field of view refers to a field of view in which light reflected by the object has an angle with the horizontal direction of the imaging module 2 but is not perpendicular, and the prism 1 can adjust light corresponding to the oblique field of view to be perpendicular to the horizontal direction of the imaging module 2. The light rays entering the imaging module 2 are all adjusted to vertical light rays, so that the design of the lens group 3 is facilitated.

The lens group 3 is used for converging the view field light corresponding to each imaging module 2 onto the corresponding imaging module 2 so as to obtain a clear image.

The lens group 3 is composed of a structure capable of converging light, and the structure of converging light can be selected as follows: it is to be understood that the lens group 3 may be one of a fresnel zone plate, a fresnel lens or a convex lens, any two of the fresnel zone plate, the fresnel lens and the convex lens may be selected, or the fresnel zone plate, the fresnel lens and the convex lens may be selected at the same time, and the specific selection and combination of the lens group 3 are not limited and may be selected according to practical situations.

It should be noted that, when there is a high requirement on the lens group 3, the above-mentioned structure capable of converging light rays (e.g., fresnel zone plate, fresnel lens or convex lens, etc.) in micro-scale or nano-scale may be adopted.

The structural design of the prism 1 corresponds to the number of the imaging modules 2, and the structure of the prism 1 can ensure that light rays entering each imaging module are vertical light rays.

As an example, when the imaging modules 2 are three, as shown in fig. 1, the cross section of the prism 1 is trapezoidal, and the oblique light emitted from the left object field is refracted by the b-plane of the prism 1 and then is adjusted to be vertical light; the oblique light emitted from the object field on the right side is refracted through the a-plane of the prism 1 and then is also adjusted to be vertical light, and the light emitted from the front view field is still vertical light after passing through the c-plane of the prism 1 (the c-plane is parallel to the horizontal direction of the imaging module 2).

The vertical light rays emitted after being refracted by the a face, the b face and the c face of the prism 1 are focused on the corresponding imaging module 2 for imaging through a Fresnel zone plate, a Fresnel lens or a convex lens arranged above the corresponding imaging module 2. In this example, an a-part image of the target object is obtained on the first imaging module 2, a B-part image of the target object is obtained on the second imaging module 2, and a C-part image of the target object is obtained on the third imaging module 2, wherein the a-part, the B-part and the C-part form a complete target object, and the partial images obtained by the three imaging modules 2 are spliced into a complete target object image through image processing.

Therefore, according to the number of imaging modules 2 and the positions where the imaging modules 2 are arranged, the structure of the prism 1 is determined, the view field light rays in different directions are respectively adjusted to vertical light rays through the prism faces of the prism 1 in different angles, and then the vertical light rays are respectively injected into the corresponding imaging modules 2 for imaging. Each prism 1 for adjusting light corresponds to one sub-field area, and each sub-field area corresponds to one imaging module 2.

As shown in fig. 2-4, three other realizations of the prism 1 are provided, and the working principle of the realizations is the same as that of the prism 1 provided in the above example, and the light propagation directions of the object field are adjusted by using the prisms with different angles of the prism 1, so that the light is adjusted to be vertical.

It should also be noted that when there is a high demand for the prism 1, a micro-scale or nano-scale prism film may be used.

In the above embodiment, only three imaging modules 2 are illustrated, but in practice, the imaging modules 2 may be at least two, and at most, the imaging modules may be not limited, and the design may be selected according to the actual situation. The structure of the prism 1 is not limited to the structure exemplified in the above embodiment, and may be modified according to the working principle thereof, and the present application is not limited thereto.

The imaging modules 2 are used for acquiring images, and in one implementation, each of the imaging modules 2 corresponds to an image sensor. In this case, a structure for converging light is correspondingly disposed above each image sensor (for example, fresnel zone plates are selected as the structure for converging light), and the vertical light adjusted by the prism 1 is converged onto the corresponding image sensor through the corresponding fresnel zone plate. Referring to fig. 2, the image processing device comprises three image sensors, wherein a fresnel zone plate is correspondingly arranged above each image sensor, the fresnel zone plate converges corresponding vertical light rays onto the corresponding image sensor, a target object is divided into three parts and imaged on the corresponding image sensor, each image sensor acquires partial images of the target object, and finally, the complete images of the target object are obtained through image processing. The benefit of this realizable implementation is that a large area image sensor need not be used.

In another implementation manner, all the imaging modules 2 correspond to one image sensor, which can be understood that one image sensor is divided into a plurality of imaging modules 2, a light converging structure (taking a fresnel zone plate as an example for each light converging structure) is respectively arranged on the corresponding imaging module 2, and the vertical light adjusted by the prism 1 is converged on the corresponding imaging module 2 through the corresponding fresnel zone plate. And a Fresnel zone plate is correspondingly arranged above each imaging module 2, the Fresnel zone plate converges the corresponding vertical light rays onto the corresponding imaging module 2, the target object is divided into three parts for imaging on an image sensor, the image sensor respectively acquires partial images of the target object in three areas, and finally, the complete images of the target object are obtained through image processing. The advantage of this realisation is that only one image sensor is required, facilitating installation.

The obtained images can be black and white images, and are preferably suitable for collecting fingerprint images. A color image is more desirable when the object is a person or a scene, etc., and thus, the following one is provided for the imaging module 2.

Each imaging module 2 corresponds to three image sensors for receiving red light, green light and blue light, respectively. As shown in fig. 5, each imaging module 2 corresponds to a sub-field area, each sub-field area corresponds to three image sensors, and each image sensor is correspondingly provided with a structure for converging corresponding light, for example: fresnel zone plates, fresnel lenses or convex lenses, etc. Taking a fresnel zone plate corresponding to each image sensor as an example for explanation. In a sub-field area, there is an imaging module 2 corresponding to the sub-field area, the imaging module 2 includes three image sensors, according to the difference of received red, green and blue light, corresponding fresnel zone plates are set on the corresponding image sensors, so that red light, green light and blue light are respectively converged on the corresponding image sensors, and through image processing, a color image of a target object corresponding to the sub-field area is obtained, and according to the above method, a color image of the target object corresponding to the rest sub-field area is obtained, and finally, a complete color image of the target object is obtained through image processing. In fig. 5, R represents an image sensor that receives red light, G represents an image sensor that receives green light, and B represents an image sensor that receives blue light.

It should be noted that, the fresnel zone plate is commonly used for collecting monochromatic light with a fixed wavelength, such as red light, green light or blue light, and therefore, when the fresnel zone plate is selected, the fresnel zone plate is mainly used for collecting monochromatic light, as shown in fig. 5. However, in the case of collecting monochromatic light, the fresnel zone plate is not limited to be used, and a fresnel lens, a convex lens, or the like may be used. It should be noted that, the arrangement of the image sensors is not limited in this application, and as shown in fig. 5, the image sensors may be arranged in a matrix.

In order to isolate stray light, astigmatism and adjacent sub-field aliasing, the application sets up the field stop 4 between adjacent imaging modules 2, and the height of field stop 4 can carry out suitable setting according to actual conditions, wherein, lens group 3 can install on field stop 4.

Further, the outside of the sub-field imaging module is provided with a sealing adhesive 7, and the sealing adhesive 7 is light-tight and is used for fixing the sub-field imaging module.

Referring to fig. 6, in a second embodiment of the present application, a terminal device is provided, which includes a display screen 5 and the split-field imaging module according to the first embodiment, an intra-screen micro-pore matrix 6 is disposed in the display screen 5, and the split-field imaging module is located below the intra-screen micro-pore matrix 6.

The terminal device may be any device that may employ the split-field imaging module for image acquisition, for example, may be a mobile phone, a computer, a tablet computer, a camera, a video camera, a scanner, and so on.

The split-view field imaging module is applied to the terminal equipment and is equivalent to an under-screen camera, so that the overall under-screen camera of the terminal equipment is realized. The display screen 5 is internally provided with an in-screen micropore matrix 6, light outside the display screen 5 is emitted into the display screen 5 through the micropore matrix 6, however, the light transmittance of the in-screen micropore matrix 6 is limited, and in order to collect large-area energy for imaging, the imaging module is used for imaging by utilizing a split-view field, the object is divided into a plurality of split-view fields to be imaged on the corresponding imaging modules 2 respectively, and finally the object partial images acquired on the imaging modules 2 are spliced into a complete object image through image processing. The method is characterized in that the light rays of each sub-view field are respectively converged and imaged by utilizing limited light transmittance, so that a clear and complete target object image is obtained.

The split-view field imaging module is arranged below the display screen 5, the position of the split-view field imaging module corresponds to the position of the micro-pore matrix 6 in the screen, the split-view field imaging module can be fixed below the display screen 5 through the sealing glue 7, the prism 1 is arranged between the display screen 5 and at least two imaging modules 2, the lens group 3 is arranged between the prism 1 and the at least two imaging modules 2, and the prism 1 is used for adjusting the direction of light rays emitted from the prism 1 to be perpendicular to the at least two imaging modules 2; the lens group 3 is used for converging object field light onto the corresponding imaging module 2 respectively.

For a specific description of the split-field imaging module, reference is made to the first embodiment provided in the present application, and details are not repeated here.

The same or similar parts between the various embodiments in this specification are referred to each other. The foregoing detailed description has been provided for the purposes of illustration in connection with specific embodiments and exemplary examples, but such description is not to be construed as limiting the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications and improvements may be made to the technical solution of the present application and its embodiments without departing from the spirit and scope of the present application, and these all fall within the scope of the present application. The scope of the application is defined by the appended claims.

The above-described embodiments of the present application are not intended to limit the scope of the present application.

Claims

1. A split-field imaging module, comprising: a prism (1) and at least two imaging modules (2);

the prism (1) is positioned above the at least two imaging modules (2), and the prism (1) is used for adjusting the direction of light rays emitted from the prism (1) to be perpendicular to the at least two imaging modules (2);

a lens group (3) is arranged between the prism (1) and the at least two imaging modules (2), and the lens group (3) is used for converging object field light rays onto the corresponding imaging modules (2) respectively;

the prism (1) comprises a plurality of prism faces for adjusting the light direction, each prism face corresponds to one sub-field area, and each sub-field area corresponds to one imaging module (2).

2. The split-field imaging module according to claim 1, wherein each imaging module (2) corresponds to an image sensor.

3. The split-field imaging module according to claim 1, wherein all of the imaging modules (2) correspond to one image sensor.

4. A split-field imaging module according to claim 2 or 3, wherein the lens group (3) comprises at least one of the following: each imaging module (2) corresponds to one fresnel zone plate, or fresnel lens or convex lens.

5. The split-field imaging module according to claim 1, wherein each imaging module (2) corresponds to three image sensors for receiving red, green and blue light, respectively.

6. The split-field imaging module according to claim 5, wherein the lens group (3) comprises at least one of the following: and each image sensor corresponds to one Fresnel zone plate, or Fresnel lens or convex lens.

7. The split-field imaging module according to claim 1, wherein a field stop (4) is provided between two adjacent imaging modules (2).

8. The split-field imaging module according to claim 1, wherein the prism (1) employs a micro-scale prism film or a nano-scale prism film.

9. The split-field imaging module according to claim 1, wherein the number of imaging modules (2) is three.

10. The terminal device is characterized by comprising a display screen (5) and the split-view field imaging module according to any one of claims 1-8, wherein an intra-screen micropore matrix (6) is arranged in the display screen (5), and the split-view field imaging module is positioned below the intra-screen micropore matrix (6).