WO2019062439A1

WO2019062439A1 - Optical fingerprint assembly and mobile terminal

Info

Publication number: WO2019062439A1
Application number: PCT/CN2018/102959
Authority: WO
Inventors: 吴俊纬
Original assignee: 维沃移动通信有限公司
Priority date: 2017-09-28
Filing date: 2018-08-29
Publication date: 2019-04-04
Also published as: CN107644215B; CN107644215A

Abstract

Provided are an optical fingerprint assembly and a mobile terminal. The optical fingerprint assembly comprises: a transparent cover plate, a light-emitting display screen and a photosensitive element, wherein the light-emitting display screen is located between the transparent cover plate and the photosensitive element; a collimating layer is provided between the transparent cover plate and the photosensitive element; the collimating layer is used for converting light rays emitted from the transparent cover plate to an end face of the photosensitive element into collimated light, and conducting same to the photosensitive element; and the light rays are emitted by the light-emitting display screen.

Description

Optical fingerprint component and mobile terminal

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201710897377.5, filed on Sep. 28,,,,,,,,,,,

Technical field

The present disclosure relates to the field of communications technologies, and in particular, to an optical fingerprint component and a mobile terminal.

Background technique

With the continuous development of technology, the proportion of mobile terminals such as mobile phones is getting higher and higher, and full-screen mobile terminals have become a development trend. For fingerprint recognition of full-screen mobile terminals, conventional capacitive fingerprints cannot penetrate the cover glass with a thickness exceeding 0.5 mm, so they are no longer suitable for the development trend of full-screen mobile terminals, and have good penetrating optical fingerprints. Become a new technical direction.

At present, for the design of fingerprint recognition of a full-screen mobile terminal, an optical fingerprint photosensitive element is generally stacked under the display screen. In the practical application of fingerprint recognition, by fingerprinting the fingerprint on the glass cover covered on the display screen; however, the light for identifying the fingerprint passes through at least the display screen and the glass cover, and since the glass cover has a certain Thickness, the light will be more severely refracted and scattered during the process of returning through the glass cover, resulting in the fingerprint image being unable to be clearly imaged on the optical fingerprint chip. It can be seen that the full-screen optical fingerprint recognition in the related art has a problem of low definition; and if the optical fingerprint photosensitive element is a silicon-based complementary metal oxide semiconductor (CMOS) image sensor, image recognition can be improved. Sharpness, but only for small areas. If applied to full-screen fingerprint recognition, the size is too large, the cost is too high, and it cannot be used.

Summary of the invention

An embodiment of the present disclosure provides an optical fingerprint assembly including: a transparent cover, a light-emitting display, and a photosensitive element, the light-emitting display being located between the transparent cover and the photosensitive element, in the transparent cover Provided with a collimating layer between the photosensitive element, the collimating layer for converting light emitted from the transparent cover toward the end surface of the photosensitive element into collimated light, and conducting to the photosensitive element; Wherein the light is emitted by the illuminated display screen.

The embodiment of the present disclosure further provides a mobile terminal, including the above optical fingerprint component.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments of the present disclosure will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present disclosure. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

1 is a schematic structural diagram of an optical fingerprint component according to an embodiment of the present disclosure;

Figure 2 is a partial enlarged view of the area A in Figure 1;

FIG. 3 is a second schematic structural diagram of an optical fingerprint component according to an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

1-3, FIG. 1 is a schematic structural diagram of an optical fingerprint assembly according to an embodiment of the present disclosure; FIG. 2 is a partial enlarged view of an area A in FIG. 1; FIG. 3 is an optical fingerprint assembly provided by an embodiment of the present disclosure. The second schematic of the structure.

As shown in FIG. 1 to FIG. 3 , an embodiment of the present disclosure provides an optical fingerprint assembly 100 including a transparent cover 10 , a light-emitting display 20 , and a photosensitive element 30 . The illuminated display 20 is located on the transparent cover 10 . Between the transparent cover 10 and the photosensitive element 30, a alignment layer 40 is disposed between the transparent cover 10 and the photosensitive element 30, and the alignment layer 40 is used to face the transparent cover 10 The light emitted from the end face of the photosensitive member 30 is converted into collimated light, which is conducted to the photosensitive member 30; wherein the light is emitted from the light-emitting display 20.

In the embodiment of the present disclosure, the transparent cover 10 includes a first surface and a second surface disposed opposite to each other, wherein the transparent cover 10 faces the end surface of the photosensitive member 30 as the second surface of the transparent cover 10, and the transparent cover 10 may be a cover made of a light transmissive material, such as a cover glass, which may function to encapsulate and protect the optical fingerprint assembly 100; the illuminated display 20 is located on the second side of the transparent cover 10 for generating The red-green blue light is displayed and the image is also used to emit light for fingerprint recognition; the photosensitive element 30 is also located on the second side of the transparent cover 10 for imaging the fingerprint 200. Since the transparent cover 10 has a certain thickness, the light returned by the finger is emitted from the second surface of the transparent cover 10, and part of the divergent light is formed, so that the fingerprint 200 of the finger cannot be clearly imaged on the photosensitive element 30. By providing the alignment layer 40 between the transparent cover 10 and the photosensitive element 30, the light emitted from the second side of the transparent cover 10 can be converted into collimated light by the alignment layer 40 and transmitted to the photosensitive element 30. The fingerprint 200 of the finger can be clearly imaged on the photosensitive element 30, thereby effectively enhancing the fingerprint recognition function of the optical fingerprint assembly 100.

The working principle of the embodiment of the present disclosure is that, in the process of fingerprint recognition, the finger is pressed on the first surface of the transparent cover 10, and the light generated by the light-emitting display 20 can be emitted through the transparent cover 10; when there is a finger press On the first side of the transparent cover 10, part of the light emitted from the light-emitting display 20 is reflected by the finger, and then emitted from the second side of the transparent cover 10; The light emitted from the second side of the second surface is conducted to the photosensitive member 30, thereby imaging the fingerprint 200 of the finger on the photosensitive member 30, thereby realizing the function of fingerprint recognition. Since the transparent cover 10 has a certain thickness, the light returned by the finger is emitted from the second surface of the transparent cover 10, and part of the divergent light is formed, so that the fingerprint 200 of the finger cannot be clearly imaged on the photosensitive element 30. By providing the alignment layer 40 between the transparent cover 10 and the photosensitive element 30, the light emitted from the second side of the transparent cover 10 can be converted into collimated light by the alignment layer 40 and transmitted to the photosensitive element 30. The fingerprint 200 of the finger can be clearly imaged on the photosensitive element 30, thereby enhancing the fingerprint recognition function of the optical fingerprint assembly 100.

The optical fingerprint component 100 provided by the embodiment of the present disclosure can be applied to a full-screen mobile terminal for full-screen fingerprint recognition for a full-screen display area, and the photosensitive element 30 can be disposed in a full screen, that is, the photosensitive element 30 is disposed on the light-emitting device. In the display area of the display screen 20, at this time, as shown in FIG. 1 , the light-emitting display screen 20 includes a light-emitting surface and a back surface disposed opposite to each other, wherein the transparent cover 10 is disposed on the light-emitting display 20 The photosensitive element 30 is disposed on a back side of the light-emitting display 20; and the alignment layer 40 is located between the light-emitting display 20 and the photosensitive element 30.

With the above solution, the alignment layer 40 is located between the light-emitting display panel and the photosensitive element 30, and is emitted from the light-emitting display 20 when a finger is pressed on the first surface of the transparent cover 10. Part of the light is reflected by the blocking of the finger, and then ejected from the second side of the transparent cover 10; the light emitted from the second side of the transparent cover 10 passes through the illuminated display 20, and then The straight layer 40 aligns the light into collimated light and conducts it to the photosensitive element 30, thereby imaging the fingerprint 200 of the finger on the photosensitive element 30, thereby realizing the function of full-screen fingerprint recognition. The full-screen fingerprint existing in the optical fingerprinting technology of the related art can be solved by arranging the collimating layer 40 to align the light emitted from the transparent cover 10 and the light-emitting display 20 onto the photosensitive element 30. The problem of image blurring during recognition, and solving the problem that the large-scale silicon-based Complementary Metal Oxide Semiconductor (CMOS) image sensor in the related art cannot be used to make a full-screen fingerprint recognition mobile terminal, By the arrangement of the alignment layer 40, it is also possible to ensure that the photosensitive area is maximized to solve the problem of insufficient light sensitivity when the photosensitive element 30 is placed under the light-emitting display panel 20 having a low transmittance.

It should be noted that the optical fingerprint component 100 provided by the embodiment of the present disclosure can also be applied to a full-screen mobile terminal for local fingerprint recognition. At this time, the photosensitive element 30 is disposed outside the display area of the light-emitting display 20, That is to say, the photosensitive element 30 is disposed only under the transparent cover 10 and outside the display area of the light-emitting display 20; this solution can be used for local area fingerprint recognition design of the full-screen mobile terminal in the related art. When the ordinary photosensitive element is used and the transparent cover 10 has a large thickness, there is a problem of image blurring, and a silicon-based CMOS image sensor has a high cost in local fingerprint recognition, thereby improving the definition of the fingerprint recognition image. And the purpose of reducing costs.

Hereinafter, the optical fingerprint component 100 is applied to a full-screen mobile terminal, and full-screen fingerprint recognition is performed for the full-screen display area (that is, the alignment layer 40 is disposed between the light-emitting display 20 and the photosensitive element 30) as an example. The optical fingerprint assembly provided by the present disclosure will be further described in detail.

In this embodiment, the light-emitting display 20 may be a flexible organic light-emitting diode display or a glass organic light-emitting diode display.

Optionally, the alignment layer 40 is a fiber alignment layer.

In this embodiment, the alignment layer 40 may be a fiber alignment layer, and the light alignment layer has an angle that can not only calibrate the light emitted from the second surface of the transparent cover 10, but also has the characteristics of high light conversion efficiency. Effectively reducing the intensity of the light during conduction, and allowing the light returned by the fingerprint 200 to be clearly imaged at the photosensitive element 30.

It should be noted that, in other embodiments of the present disclosure, the alignment layer 40 may also be implemented by other structures, such as a lens structure capable of converting divergent light into collimated light, etc., as long as it can be realized. The structure that is reflected from the first surface of the lens cover to the transparent cover and calibrated to collimate light through the transparent cover and the light-emitting display is all within the scope of protection of the present application. Inside.

Optionally, the light receiving angle of the collimating layer 40 is positively related to the thickness of the display module, wherein the display module is the transparent cover 10 including the bonding connection and the light emitting display 20.

In this embodiment, since the transparent cover 10 and the light-emitting display 20 both have a certain thickness, the light is blocked by the finger, and the light transmission angle changes during the return process, and a certain light-receiving angle is set by the alignment layer 40. The light that can pass through the alignment layer 40 can be effectively increased to enhance the integrity of the fingerprint 200 imaged on the photosensitive element 30.

The light-collecting angle of the alignment layer 40 is positively related to the thickness of the display module. The display module includes a transparent cover 10 and a light-emitting display 20 that are attached to each other, that is, the thickness of the display module is a superposition of the transparent cover 10 and the illuminated display 20. For example, when the thickness of the transparent cover 10 and the illuminating display 20 is 0.9-1.3 mm, the light-collecting angle of the collimating layer 40 ranges from 6 to 8; preferably, the transparent cover 10 and the illuminating display 20 The superimposed thickness was 1.1 mm, and the collimating layer 40 had a light collecting angle of 7°.

Optionally, as shown in FIG. 2, the photosensitive element 30 is an image sensor, and the photosensitive element 30 includes a substrate 31 and a plurality of sensor pixel units 32 arranged in an array on the substrate 31. The straight layer 40 includes a plurality of fiber units 41.

In the present embodiment, the substrate 31 may be a glass substrate and used to carry the sensor pixel unit 32; the sensor pixel unit 32 is used for imaging the fingerprint 200, and the optical fiber unit 41 is used to calibrate the light angle. The corresponding relationship between the sensor pixel unit 32 and the optical fiber unit 41 includes one-to-one, one-to-many or many-to-one. For example, as shown in FIG. 1 and FIG. 2, each of the sensor pixel units 32 corresponds to one of the optical fibers. The unit 41; each of the fiber units 41 corresponds to at least two of the sensor pixel units 32; as shown in FIG. 3, each of the sensor pixel units 32 corresponds to at least two of the fiber units 41.

In the above solution, one or more optical fibers may be disposed in each of the optical fiber units 41.

Optionally, as shown in FIG. 3, the light-emitting display 20 includes at least two light-emitting units 21, and two adjacent light-emitting units 21 are provided with a pitch, and each of the sensor pixel units 32 faces the pitch. Settings.

In the present embodiment, since the optical fiber unit 41 and the sensor pixel unit 32 are arranged one-to-one, the optical fiber alignment layer and the photosensitive element 30 need to be accurately aligned, which has great manufacturing difficulty and high cost. However, by arranging the sensor pixel unit 32 at the pitch of the adjacent two light-emitting units 21, the space can be fully utilized, thereby further transmitting the light emitted from the second surface of the transparent cover 10 to the sensor pixel unit 32. .

It should be noted that the optical fingerprint assembly 100 is further provided with a switching element 33, which may be disposed on the substrate 31, and the switching element 33 is used to control the operation of the light-emitting display 20 and the photosensitive element 30. In the present embodiment, in order to make full use of the space and to maximize the light emitted from the second surface of the transparent cover 10 to the sensor pixel unit 32, the switching element 33 may be disposed facing the light emitting unit 21.

Embodiments of the present disclosure are also directed to a mobile terminal including the optical fingerprinting component 100 described above.

The mobile terminal may be a full screen mobile terminal, such as a full screen mobile phone or a full screen tablet computer.

It should be noted that the implementation of the foregoing embodiment of the optical fingerprint component 100 is also applicable to the embodiment of the mobile terminal, and the same technical effects can be achieved, and details are not described herein again.

The above is only the specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the disclosure. It should be covered within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosure should be determined by the scope of the claims.

Claims

An optical fingerprint assembly comprising: a transparent cover plate, a light-emitting display screen and a photosensitive element, the light-emitting display screen being located between the transparent cover plate and the photosensitive element, and the transparent cover plate and the photosensitive element Provided with a collimating layer for converting light emitted from the transparent cover toward the end surface of the photosensitive element into collimated light, which is conducted to the photosensitive element; wherein the light is The illuminated display screen emits.
The optical fingerprint assembly of claim 1 , wherein the illuminated display screen comprises a light emitting surface and a back surface disposed opposite each other;

The transparent cover plate is disposed on a side of the light emitting surface of the light emitting display screen;

The photosensitive element is disposed on a back side of the illuminated display screen;

And the alignment layer is located between the light emitting display and the photosensitive element.
The optical fingerprint assembly of claim 2 wherein the alignment layer is a fiber alignment layer.
The optical fingerprint module of claim 3, wherein the light-collecting angle of the collimating layer is positively related to the thickness of the display module, and the display module is the transparent cover plate including the bonding connection. The illuminated display.
The optical fingerprint module according to claim 4, wherein when the thickness of the display module ranges from 0.9 to 1.3 mm, the light collecting angle of the alignment layer ranges from 6 to 8 degrees.
The optical fingerprint module of claim 5, wherein the display module has a thickness of 1.1 mm and the collimating layer has a light collecting angle of 7°.
The optical fingerprint assembly of claim 3 wherein the photosensitive element is an image sensor.
The optical fingerprinting assembly of claim 7 wherein said photosensitive element comprises a substrate and a plurality of sensor pixel units arranged in an array disposed on said substrate, said collimating layer comprising a plurality of fiber optic units.
The optical fingerprinting assembly of claim 8 wherein each of said sensor pixel units corresponds to one of said fiber optic units.
The optical fingerprint assembly of claim 8 wherein each of said fiber optic units corresponds to at least two of said sensor pixel units.
The optical fingerprint assembly of claim 8 wherein each of said sensor pixel units corresponds to at least two of said fiber units.
The optical fingerprint module according to claim 8, wherein the light-emitting display screen comprises at least two light-emitting units, and adjacent two light-emitting units are provided with a pitch, and each of the sensor pixel units is set to the pitch .
The optical fingerprint assembly of claim 2, wherein the illuminated display screen is a flexible organic light emitting diode display or a glass organic light emitting diode display.
A mobile terminal comprising the optical fingerprint assembly of any one of claims 1 to 13.
The mobile terminal of claim 14, the mobile terminal being a full screen mobile terminal.