CN212782047U

CN212782047U - Biological characteristic image acquisition device under screen

Info

Publication number: CN212782047U
Application number: CN202021109734.0U
Authority: CN
Inventors: 冯继雄; 田志民; 王长海; 李保梁; 陈子轩; 宋子明; 陈世林; 刘小宁
Original assignee: Chipone Technology Beijing Co Ltd
Current assignee: Chipone Technology Beijing Co Ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2021-03-23
Anticipated expiration: 2030-06-16

Abstract

The utility model provides a biological characteristic image acquisition device under screen, is located the screen below, includes, microlens array, keeps apart the frame to and image sensor, the microlens array with keep apart the frame, be located the screen with between the image sensor. The utility model discloses a biological feature image acquisition device under screen, it is big to adopt the picture area, and thickness is little, and the installation is convenient, and imaging signal is strong, can effectively gather signal light, avoids stray light.

Description

Biological characteristic image acquisition device under screen

Technical Field

The utility model relates to an image acquisition technical field especially relates to a biological characteristic image acquisition device under screen.

Background

In the prior art, the optical biological characteristic acquisition technology under the screen is widely used in various intelligent terminal devices. Fig. 4 is a schematic diagram of a biometric image acquisition in the prior art, and as shown in fig. 4, the prior art optical biometric image acquisition under a screen uses a screen OLED/TFT-LCD as a light source to acquire a biometric feature (such as a fingerprint).

The existing image acquisition device mainly has 2 schemes:

(1) lens solutions. Fig. 5 is a schematic diagram of a biometric image capturing device using a lens in the prior art, and as shown in fig. 5, the biometric image capturing device using the lens has the advantages of strong imaging signals and the disadvantages of small image capturing area and large thickness, and can only be fixed on a screen.

(2) A collimator arrangement. FIG. 6 is a schematic diagram of a biometric image capturing device using an optical collimator in the prior art, as shown in FIG. 6, the device uses the optical collimator to image, which has the advantage of large image capturing area and can achieve full-screen biometric capture; the defects are that the thickness is large and the imaging signal is weak.

Disclosure of Invention

In order to solve the deficiencies in the prior art, the utility model provides a biological characteristic image acquisition device under screen adopts the formation of image of microlens array, can realize full-screen biological characteristic collection, and thickness is little moreover, and imaging signal is strong.

In order to achieve the above object, the present invention provides an off-screen biometric image capturing device, comprising a microlens array, an isolation frame, and an image sensor,

the micro lens array and the isolation frame are positioned between the screen and the image sensor.

Further, an air layer is formed inside the isolation frame; the air layer and the microlens array form a refractive surface.

Further, the micro lens array is located between the isolation frame and the image sensor and attached to the image sensor.

Further, the micro lens array is located between the screen and the isolation frame and attached to the screen.

Further, the microlens array includes an upper microlens array and a lower microlens array, wherein,

the upper micro-lens array is positioned between the screen and the isolation frame and is attached to the screen;

and the lower micro-lens array is positioned between the isolation frame and the image sensor and is attached to the image sensor.

Further, the microlens array and the image sensor are covered under a full screen.

Further, a filter layer is further included between the screen and the image sensor, and the filter layer is a polarizing film or an optical filter or a collimator or a collimating hole.

Further, the microlens array is in the shape of a thin film.

Compared with the prior art, the utility model discloses a biological characteristic image acquisition device has following technological effect under the screen:

(1) the thickness is small, the existing micro-lens array is made into a thin film by adopting the film technology to be used as the micro-lens array of the utility model, and the thickness of the device is greatly reduced;

(2) the area is large, and because the micro-lens array and the image sensor can realize full-screen coverage, the image acquisition area is increased;

(3) the installation is convenient, the image sensor and the screen are effectively isolated through the isolation frame, and the installation and the maintenance are convenient;

(4) the imaging signal is strong, and light that biological characteristic signal sent gathers together to the center after the microlens array refraction, realizes the spotlight through the microlens array again, can effectively gather signal light, avoids stray light.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a structural diagram of an off-screen biometric image capturing device according to embodiment 1 of the present invention;

fig. 2 is a structural diagram of an off-screen biometric image capturing device according to embodiment 2 of the present invention;

fig. 3 is a structural diagram of an off-screen biometric image capturing apparatus according to embodiment 3 of the present invention;

FIG. 4 is a schematic diagram of a prior art biometric image acquisition;

FIG. 5 is a schematic diagram of a prior art biometric image capture device employing a lens;

fig. 6 is a schematic diagram of a biometric image capturing device using an optical collimator in the prior art.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example 1

Fig. 1 is a structural diagram of an off-screen biometric image capturing device according to embodiment 1 of the present invention, as shown in fig. 1, the off-screen biometric image capturing device of the present invention comprises a microlens array 4, an isolation frame 3, and an image sensor 5, wherein,

the isolation frame 3 is arranged at the lower part of the screen 1, so that the screen 1 and the image sensor 5 can be effectively isolated; an air layer 6 is formed in the isolation frame 3 and between the screen 1 and the image sensor 5;

the micro lens array 4 is arranged at the lower part of the isolation frame 3, the lower part of the micro lens array is attached to the image sensor 5, and light rays are collimated;

an air layer 6, which together with the microlens array 4 forms a refractive surface (different in refractive index to enable the lens to function) between the screen 1 and the image sensor 5.

In this embodiment, the microlens array 4 may also be disposed between the screen 1 and the isolation frame 3, and the upper portion of the microlens array 4 is attached to the screen 1 to condense light.

In this embodiment, the microlens array 4 may be a hyperboloid microlens array or a single-curved-surface microlens array, and when the single-curved-surface microlens array is adopted, the curved surface orientation of the microlens array 4 may not be limited.

Example 2

Fig. 2 is a structural diagram of an off-screen biometric image capturing device according to embodiment 2 of the present invention, and as shown in fig. 2, the off-screen biometric image capturing device of the present invention comprises a microlens array 2, an isolation frame 3, a microlens array 4, and an image sensor 5, wherein,

the micro-lens array 2, the isolation frame 3, the micro-lens array 4 and the image sensor 5 are sequentially arranged from top to bottom;

the micro lens array 2 is arranged at the lower part of the screen 1, and the upper part of the micro lens array is attached to the screen 1;

the micro lens array 4 is arranged on the upper part of the image sensor 5, and the lower part of the micro lens array is attached to the image sensor 5;

the isolation frame 3 is positioned between the micro lens array 2 and the micro lens array 4, so that the screen 1 and the image sensor 4 can be effectively isolated; an air layer 6 is formed in the isolation frame 3 and between the screen 1 and the image sensor 5;

and an air layer 6 which forms a refraction surface between the screen 1 and the image sensor 5 together with the microlens array 2 and the microlens array 4 and refracts light (the lens functions only if the refractive index is different).

In this embodiment, the microlens array 2 is disposed between the screen 1 and the isolation frame 3, and condenses light. The microlens array 4 is disposed between the isolation bezel 3 and the image sensor 5, and collimates light.

In this embodiment, the

microlens arrays

2 and 4 are hyperboloid microlens arrays or single-curved-surface microlens arrays, and may be any combination of hyperboloid microlens arrays and single-curved-surface microlens arrays.

When the microlens array 2 and the microlens array 4 adopt a single-curved-surface microlens array, the curved surface orientation of the microlens array may not be limited.

Example 3

Fig. 3 is a structural diagram of an off-screen biometric image capturing device according to embodiment 3 of the present invention, and as shown in fig. 3, the off-screen biometric image capturing device of the present invention is additionally provided with a filter layer 7 on the basis of embodiment 2,

a filter layer 7 between the screen 1 and the microlens array 2 or between the microlens array 4 and the image sensor 5; it is also possible to add filter layers 7 between the screen 1 and the microlens array 2, and between the microlens array 4 and the image sensor 5, respectively.

In this embodiment, the filter layer 7 is a polarizer, a filter, a collimator, a collimating hole, or the like.

The utility model discloses a microlens array adopts the membrane technique to prepare into the microlens array of film form with current microlens array, has reduced the thickness of device.

The micro lens array 2, the micro lens array 4 and the image sensor 4 can realize full screen coverage, and the area is large.

In this embodiment, the isolation portion 3 is located between the screen 1 and the lens 3, so that the image sensor 5 and the screen 1 can be effectively isolated, and installation and maintenance are facilitated.

Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The under-screen biological characteristic image acquisition device is positioned at the lower part of a screen and comprises a micro-lens array, an isolation frame and an image sensor,

the micro lens array and the isolation frame are positioned between the screen and the image sensor;

the microlens array and the image sensor are covered under a full screen.

2. The device for acquiring an underscreen biometric image according to claim 1, wherein an air layer is formed inside the isolation border; the air layer and the microlens array form a refraction surface.

3. The device according to claim 1, wherein the microlens array is disposed between the isolation bezel and the image sensor and attached to the image sensor.

4. The device according to claim 1, wherein the microlens array is disposed between the screen and the isolation frame and attached to the screen.

5. The off-screen biometric image capture device of claim 1, wherein the microlens array includes an upper microlens array and a lower microlens array, wherein,

6. The device according to claim 1, further comprising a filter layer between the screen and the image sensor, wherein the filter layer is a polarizer or a filter or a collimator or a collimating hole.

7. The underscreen biometric image capture device of claim 1, wherein the microlens array is in the form of a thin film.