WO2020258900A1

WO2020258900A1 - Under-screen fingerprint module matching flexible screen and mobile terminal

Info

Publication number: WO2020258900A1
Application number: PCT/CN2020/076635
Authority: WO
Inventors: 蔡奇; 林娇; 彭旭
Original assignee: 华为技术有限公司
Priority date: 2019-06-26
Filing date: 2020-02-25
Publication date: 2020-12-30
Also published as: CN112149452A

Abstract

An under-screen fingerprint module (10) matching a flexible screen and a mobile terminal (100). The under-screen fingerprint module (10) comprises a flexible display screen (101), a supporting compensator (12) and a fingerprint image sensor (14). The flexible display screen (101) comprises a flexible cover plate (103) located on a top layer, a supporting layer (106) located on a bottom layer, and a functional layer located in the middle. The supporting layer (106) is provided with an opening (107). The supporting compensator (12) comprises a side frame (121) and a light-transmitting region (122). The light-transmitting region (122) is connected to a top portion of the side frame (121) and forms an enclosed space (123) together with the side frame (121). The side frame (121) and the light-transmitting region (122) extend into the opening (107). The side frame (121) is connected to the supporting layer (106), and the light-transmitting region (122) is connected to the functional layer. The fingerprint image sensor (14) is at least partially located within an accommodating space. The described solution may not only ensure a fingerprint imaging effect, but may also enable the structure of the flexible display screen (101) to be stable and reliable.

Description

Under-screen fingerprint module and mobile terminal matching flexible screen

This application requires the priority of a Chinese patent application filed with the State Intellectual Property Office of China, the application number is 201910561492.4, and the invention title is "fingerprint module and mobile terminal under the screen matching flexible screen" on June 26, 2019, and its entire contents Incorporated in this application by reference.

Technical field

The present invention relates to the technical field of an under-screen fingerprint module, and in particular to an under-screen fingerprint module and a mobile terminal matching a flexible screen.

Background technique

At present, mobile electronic terminal devices such as mobile phones are widely used in people's daily lives. In different usage scenarios, users have different requirements for the display screens of mobile terminals such as mobile phones. In the rapid development of full-screen display, the corresponding under-screen (in-screen, “under the screen” for short as “under-screen”; “inside the screen” for short as “in-screen”) fingerprint recognition technology is prepared because it is more in line with users’ habits. Expected. The development of flexible folding display screens has also attracted the attention of the public. Through folding, the terminal can meet the needs of users in different forms in different scenarios. However, how to apply under-screen fingerprint technology to flexible screens can not only ensure the effect of fingerprint imaging and recognition, but also make the structure of the display screen stable and reliable, which is a bottleneck encountered by the industry in research and development.

Summary of the invention

The embodiment of the present application provides an under-screen fingerprint module and a mobile terminal matching a flexible screen, which can not only ensure the fingerprint imaging effect, but also make the structure of the display screen stable and reliable.

In the first aspect, the present application provides an under-screen fingerprint module matching a flexible screen, including a flexible display screen, a supporting compensation member, and a fingerprint image sensor. The flexible display screen includes a flexible cover on the top layer and a support layer on the bottom layer. And a functional layer located in the middle, the functional layer includes a touch layer and a display light-emitting layer, and the touch layer is a structure that realizes the touch function of the flexible display screen. The support layer is provided with an opening, the support compensator includes a side frame and a light-transmitting area, the light-transmitting area is connected to the top of the side frame and forms an enclosed space with the side frame, the side frame and The light-transmitting area extends into the opening, the side frame is connected to the support layer, the light-transmitting area is connected to the functional layer, and the fingerprint image sensor is at least partially located in the receiving space. In this application, a fingerprint image sensor is installed at the opening position of the flexible display screen, and the compensator is installed at the opening position by supporting the compensator. The light-transmitting area supporting the compensator supports the flexible display screen and has light transmittance to prevent the flexible display screen from being pressed. Time deformation ensures the structural stability of the display screen and the fingerprint imaging effect.

In one embodiment, the supporting compensator is fixedly connected to the supporting layer. The support compensator can be connected to the support layer by welding. In other embodiments, the supporting compensator can also be movably connected with the supporting layer. When the flexible display screen is bent, there is a space for deformation between the two in the direction in which the flexible display screen extends. As long as the supporting compensator is ensured to be vertical The position is fixed in the direction of the flexible display screen to satisfy the support of the light transmission area for the opening position of the flexible display screen.

In one embodiment, the support compensator includes a connecting portion that extends from the bottom of the side frame toward a direction away from the light-transmitting area, that is, the connecting portion is located at the outer edge of the bottom of the side frame, and The connecting part is fixedly connected with the supporting layer, and the connecting part is overlapped and fixed with the supporting layer. A groove can also be provided on the supporting layer to accommodate the connecting part, so as to ensure the flatness of the bottom surface of the supporting layer, which is conducive to the thinning of the flexible screen.

In one embodiment, the supporting and compensating member includes a bearing portion extending from the bottom of the side frame into the containing space and used for bearing the fingerprint image sensor, that is, the bearing portion is located on the fingerprint image sensor. The fingerprint image sensor is installed between the carrying part and the light transmitting part. Through the arrangement of the bearing part, the fingerprint image sensor and the supporting compensation part can be assembled into one body to form a modular structure, and then installed on the flexible display screen together, which is simple to install and easy to operate.

In one embodiment, the supporting portion is in the shape of a flat plate and closes the opening formed by the bottom of the side frame. In other embodiments, the supporting portion is arranged corresponding to the edge of the fingerprint sensor to support the edge of the fingerprint image sensor, that is, the supporting portion does not completely overlap the bottom surface of the fingerprint image sensor, and only limits the position at the edge.

In one embodiment, the fingerprint image sensor is an optical fingerprint sensor, the transmittance of the light-transmitting area is ≥90%, and the haze of the light-transmitting area is ≤5%. The light-transmitting area is glass or acrylic material.

In one embodiment, the fingerprint image sensor is a capacitive fingerprint sensor, and the relative permittivity range of the light-transmitting area is greater than 4. The light-transmitting area is made of quartz or glass material.

In one embodiment, the fingerprint image sensor is an ultrasonic fingerprint sensor, and the range of the Young's modulus of the material in the light-transmitting area is greater than 0.1Mpa.

In an embodiment, the side frame, the connecting portion and the carrying portion are an integral sheet metal structure.

In one embodiment, the light transmission area and the side frame are assembled into an integrated structure.

In one embodiment, the fingerprint image sensor and the supporting and compensating member are assembled as a whole, and the gap between the two is filled with glue.

On the other hand, this application provides a mobile terminal, including a main board, a middle frame, and the under-screen fingerprint module matching a flexible screen according to any one of the preceding embodiments, the under-screen fingerprint module matching the flexible screen, and the The main board is installed to the middle frame, and the fingerprint image sensor is electrically connected to the main board.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background art, the following will describe the drawings that need to be used in the embodiments of the present invention or the background art.

FIG. 1 is a three-dimensional exploded schematic diagram of a mobile terminal provided by an embodiment of the present application;

2 is a cross-sectional view of a flexible display screen in a mobile terminal according to an embodiment of the present application;

3 is a three-dimensional exploded schematic diagram of an under-screen fingerprint module matching a flexible screen provided by an embodiment of the present application;

4 is a schematic diagram of a laminated cross-section of an under-screen fingerprint module matching a flexible screen provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a supporting compensator in an under-screen fingerprint module matching a flexible screen provided by an embodiment of the present application;

6 is a schematic diagram of a laminated cross-section of an under-screen fingerprint module matching a flexible screen provided by another embodiment of the present application;

FIG. 7 is a schematic diagram of a supporting compensator in an under-screen fingerprint module matching a flexible screen provided by another embodiment of the present application;

Fig. 8 is a schematic diagram of a supporting compensator in an under-screen fingerprint module matching a flexible screen provided by another embodiment of the present application.

Detailed ways

The embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention.

As shown in FIGS. 1 to 3, the under-screen fingerprint module 10 matching the flexible screen provided by the present application is applied in a mobile terminal 100, which can be a foldable smart terminal, such as a tablet, a mobile phone, etc. The display screen of the mobile terminal 100 is a flexible display screen, which can be folded to meet the needs of different usage scenarios. For example, when one-handed operation is required, the mobile terminal can be folded before use. The mobile terminal 100 includes a flexible display screen 101 and a middle frame 102 that are stacked. As shown in Figure 2, the flexible display screen 101 is an integrated modular structure. The flexible display screen 101 includes a laminated flexible cover layer 103, a touch layer 104, a display light-emitting layer 105, and a support layer 106. The touch layer The combination of 104 and the display light-emitting layer 105 is called a functional layer. The functional applications of the flexible display screen 101 (including touch, display and light emission) are realized by these two layers. The support layer 106 is the bottom layer of the flexible display screen 101. For convenience Shows the position of the fingerprint module 10 under the screen matching the flexible screen and the relationship with the flexible display screen 101. Figure 1 decomposes the support layer 106 from the flexible display screen 101 so that the opening 107 provided on the support layer 106 can be seen easily. The opening 107 is used to install the under-screen fingerprint module 10 matching the flexible screen.

The under-screen fingerprint module 10 that matches the flexible screen can be installed on the support layer 106 of the flexible display 101 or on the middle frame 102. The middle frame 102 is also used to install the motherboard, battery and other electronic components in the mobile terminal , The under-screen fingerprint module 10 matching the flexible screen is electrically connected to the motherboard. In one embodiment, the under-screen fingerprint module 10 matching the flexible screen is arranged in the non-folding area of the mobile terminal 100, which not only can ensure the fingerprint imaging effect, but also enables the flexible display screen 101 of the mobile terminal to have a stable and reliable structure.

As shown in Figures 3 and 4, in a possible implementation manner, the under-screen fingerprint module 10 matching the flexible screen includes a flexible display screen 101, a support compensator 12, and a fingerprint image sensor 14. The support compensator 12 is passed through a glue 15 It is bonded to the flexible display screen 101, and the supporting compensator 12 is used to install the fingerprint image sensor 14 and support the flexible display screen 101. The flexible display screen 101 includes a flexible cover 103 on the top layer, a support layer 106 on the bottom layer, and a functional layer in the middle. The functional layer includes a touch layer 104 and a display light emitting layer 105. The touch layer 104 is used to realize the flexible display screen. 101 touch function structure. The support layer 106 is provided with an opening 107, the support compensator 12 includes a side frame 121 and a light-transmitting area 122, the light-transmitting area 122 is connected to the top of the side frame 121 and is formed together with the side frame 121 Surrounding the space 123, the side frame 121 and the light transmission area 122 extend into the opening 107, the side frame 121 is connected to the support layer 106, and the light transmission area 122 is connected to the functional layer (specifically In other words, the light-transmitting area 122 is connected to the display light-emitting layer 105), the fingerprint image sensor 14 is at least partially located in the accommodating space 123, and the fingerprint image sensor 14 can be completely accommodated in the accommodating space 123 or partly in the accommodating space 123. In the space 123, part of the fingerprint image sensor 14 extends out of the containing space.

Specifically, the connection between the side frame 121 and the supporting layer 106 may be a direct connection or an indirect connection through other intermediate elements. For example, the side frame 121 may be welded to the supporting layer 106 or bonded to the supporting layer 106. , Or through a tight fit and fixed connection between the side frame 121 and the support layer 106, that is, the side frame 121 is in close contact with the inner wall of the opening 107, and the support compensator 12 is fixed at the opening 107 through interference fit. The connection between the light-transmitting area 122 and the functional layer can be a direct connection or an indirect connection. For example, the light-transmitting area 122 can be in direct contact with the functional layer, and the light-transmitting area 122 can also be bonded to the functional layer by glue, or Other layer structures, such as polarizers and antireflection coatings, can also be arranged between the light zone 122 and the functional layer. Specifically, the functional layer includes a touch layer 104 and a display light-emitting layer 105. The display light-emitting layer 105 is located between the touch layer 104 and the light-transmitting area 122, and the touch layer 104 is close to the flexible cover 103. In this application, the fingerprint image sensor 14 is arranged at the opening 107 of the flexible display screen 101, and the compensator 12 is installed at the position of the opening 107. The light-transmitting area 122 supporting the compensator 12 supports the flexible display screen 101 and has light transmission. It can prevent deformation of the flexible display screen 101 when it is pressed, ensure the structural stability of the display screen, and also ensure the fingerprint imaging effect. As shown in Figures 4 and 5, when a finger presses on the surface of the flexible display screen, the flexible display screen 101 will not be deformed. Although the support layer 106 of the flexible display screen is provided with an opening 107, there is a support compensator 12 in the opening 107. The position to support the flexible display screen 101 can ensure the flatness of the flexible display screen 101 without deformation, which can also ensure the authenticity of the fingerprints collected by the fingerprint image sensor 14, improve image quality, and improve fingerprint collection efficiency.

In one embodiment, the supporting compensator 12 is fixedly connected to the supporting layer 14. The support compensator 12 may be connected to the support layer 106 by welding. In other embodiments, the support compensator 12 can also be movably connected with the support layer 106. When the flexible display screen is bent, there is a space for deformation between the two in the direction in which the flexible display screen extends, as long as the support compensator is ensured The position is fixed in the direction perpendicular to the flexible display screen, and the support for the opening position of the flexible display screen by the transparent area is sufficient.

As shown in FIGS. 4 and 6, in an embodiment, the supporting compensator 12 includes a connecting portion 124 extending from the bottom of the side frame 121 toward a direction away from the light transmitting area 122 That is, the connecting portion 124 is located at the outer edge of the bottom of the side frame 121, the connecting portion 124 is fixedly connected to the supporting layer 106, and the connecting portion 124 is overlapped and fixed to the supporting layer 106. A groove (such as 4), the connecting portion 124 is accommodated to ensure the flatness of the bottom surface of the support layer 106. As shown in FIG. 4, the bottom surface of the support layer 106 and the bottom surface of the connecting portion 124 are coplanar. This design is conducive to thinning the flexible screen. The light-transmitting area 122 and the side frame 121 supporting the compensating member 12 may be a two-piece structure with different materials, and they are fixed by glue bonding. The side frame 121 and the connecting portion 124 supporting the compensator 12 may be an integral structure, and may be manufactured by integral molding of sheet metal parts.

As shown in Figures 5 and 7, in one embodiment, the supporting compensator 12 includes a bearing portion 125 extending from the bottom of the side frame 121 into the receiving space 123 for The fingerprint image sensor 14 is carried, that is, the carrying part 125 is located at the bottom of the fingerprint image sensor 14, and the fingerprint image sensor 14 is installed between the carrying part 125 and the light transmitting part 122. Through the arrangement of the supporting part 125, the fingerprint image sensor 14 and the supporting compensator 12 can be assembled into one body to form a modular structure, and then installed on the flexible display screen 101 together, which is simple to install and easy to operate.

In one embodiment, the side frame 121, the connecting portion 124 and the carrying portion 125 are an integral sheet metal structure.

In an embodiment, as shown in the embodiment shown in FIG. 7, the carrying portion 125 is in the shape of a flat plate and closes the opening formed by the bottom of the side frame 121. In other embodiments, as shown in the embodiment shown in FIG. 8, the supporting portion 125 is arranged corresponding to the edge of the fingerprint sensor 14 for supporting the edge of the fingerprint image sensor 14, that is, the supporting portion 125 is not connected to the fingerprint image. The bottom surface of the sensor is completely overlapped, and the position is limited only at the edge. In this embodiment, the bearing portion 125 also includes a mounting inclined surface 1251. The mounting inclined surface 1251 faces the direction of the support compensator 12 away from the flexible display 101. When the fingerprint image sensor 14 is installed , The fingerprint image sensor 14 contacts the installation inclined surface 1251 to push the fingerprint image sensor 14 into the accommodating space 123. Due to the installation inclined surface 1251, the vertical thrust force is converted into a horizontal component force, so that the bearing portion 125 is separated to both sides, The fingerprint image sensor 14 is allowed to enter the accommodating space 123, and then through the elastic force of the supporting compensator 12, the supporting portion 125 is returned to block the fingerprint image sensor 14 to fix the fingerprint image sensor 14 inside the accommodating space 123.

In one embodiment, the fingerprint image sensor 14 is an optical fingerprint sensor, the transmittance of the light-transmitting area 122 is ≥90%, and the haze of the light-transmitting area 122 is ≤5%. The light-transmitting area 122 is made of glass or acrylic material.

In one embodiment, the fingerprint image sensor 14 is a capacitive fingerprint sensor, and the relative permittivity range of the light-transmitting area 122 is greater than 4. The transparent region 122 is made of quartz or glass material.

In one embodiment, the fingerprint image sensor 14 is an ultrasonic fingerprint sensor, and the range of the Young's modulus of the material of the light-transmitting area 122 is greater than 0.1 Mpa.

In one embodiment, the light-transmitting area 122 and the side frame 121 are assembled into an integrated structure.

In one embodiment, the fingerprint image sensor 14 and the support compensator 12 are assembled into one body, and the gap between the two is filled with glue.

The embodiments of the application are described in detail above, and specific examples are used in this article to illustrate the principles and embodiments of the application. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the application; Those skilled in the art, based on the ideas of the present application, will have changes in the specific embodiments and application scope. In summary, the content of this specification should not be construed as limiting the present application.

Claims

An under-screen fingerprint module matching a flexible screen, which is characterized in that it includes a flexible display screen, a support compensator, and a fingerprint image sensor. The flexible display screen includes a flexible cover on the top layer, a support layer on the bottom layer and a middle The support layer is provided with an opening, the support compensator includes a side frame and a light-transmitting area, the light-transmitting area is connected to the top of the side frame and forms an enclosed space with the side frame, so The side frame and the light-transmitting area extend into the opening, the side frame is connected to the support layer, the light-transmitting area is connected to the functional layer, and the fingerprint image sensor is at least partially located in the receiving layer. In the space.
The under-screen fingerprint module matching the flexible screen of claim 1, wherein the supporting compensation member and the supporting layer are fixedly connected together.
The under-screen fingerprint module matching the flexible screen of claim 2, wherein the supporting and compensating member comprises a connecting portion, and the connecting portion faces away from the light-transmitting area from the bottom of the side frame Extending, the connecting portion is fixedly connected to the supporting layer.
The under-screen fingerprint module matching the flexible screen according to claim 2, wherein the supporting and compensating member includes a bearing portion, and the bearing portion extends from the bottom of the side frame into the receiving space, and To carry the fingerprint image sensor.
The under-screen fingerprint module matching the flexible screen according to claim 4, wherein the supporting portion is in the shape of a flat plate and closes the opening formed at the bottom of the side frame.
The under-screen fingerprint module matching the flexible screen of claim 4, wherein the supporting portion is arranged corresponding to the edge of the fingerprint sensor, and is used to support the edge of the fingerprint image sensor.
The under-screen fingerprint module matching a flexible screen according to any one of claims 1-6, wherein the fingerprint image sensor is an optical fingerprint sensor, and the transmittance of the light-transmitting area is ≥90%, The haze of the light-transmitting area is ≤5%.
The under-screen fingerprint module matching the flexible screen of claim 7, wherein the light-transmitting area is made of glass or acrylic material.
The under-screen fingerprint module matching the flexible screen according to any one of claims 1-6, wherein the fingerprint image sensor is a capacitive fingerprint sensor, and the relative permittivity range of the light-transmitting area is greater than 4.
The under-screen fingerprint module matching the flexible screen of claim 9, wherein the light-transmitting area is made of quartz or glass.
The under-screen fingerprint module matched with a flexible screen according to any one of claims 1-6, wherein the fingerprint image sensor is an ultrasonic fingerprint sensor, and the material of the light-transmitting area is determined by the Young's modulus. The range is greater than 0.1Mpa.
The under-screen fingerprint module matching the flexible screen of claim 4, wherein the side frame, the connecting portion and the carrying portion are an integral sheet metal structure.
The under-screen fingerprint module matching the flexible screen of claim 12, wherein the light-transmitting area and the side frame are assembled into an integrated structure.
The under-screen fingerprint module matching the flexible screen of claim 4, wherein the fingerprint image sensor and the supporting and compensating member are assembled as one body, and the gap between the two is filled with glue.
A mobile terminal, characterized by comprising a motherboard, a middle frame, and an under-screen fingerprint module matching a flexible screen according to any one of claims 1 to 14, the under-screen fingerprint module matching the flexible screen and the The main board is installed to the middle frame, and the fingerprint image sensor is electrically connected to the main board.