WO2020020059A1 - Mobile terminal - Google Patents

Abstract

A mobile terminal, comprising a display screen (1), a fingerprint module (2), and a flexible circuit board (3) positioned below the fingerprint module (2). The fingerprint module (2) is sandwiched and fixed between the display screen (1) and the flexible circuit board (3). The display screen (1) and the fingerprint module (2) are separately connected to the flexible circuit board (3) electrically. The flexible circuit board (3) is further electrically connected to a main board of the mobile terminal.

Description

Mobile terminal

Cross-reference to related applications

This application claims the priority of Chinese Patent Application No. 201810834807.3 filed in China on July 26, 2018, the entire contents of which are hereby incorporated by reference.

Technical field

The present disclosure relates to the technical field of fingerprint identification, and in particular, to a mobile terminal.

Background technique

With the rapid development of smart mobile terminal technology, users' demand for mobile terminals is increasing, and the requirements for mobile smart terminal experience are also increasing. Among them, fingerprint recognition technology is one of the most mature and consumers' most concerned technologies. In the related art, a through hole is provided on the surface of the cover of the mobile terminal to expose the touch sensing area of the fingerprint sensor, so that the fingerprint sensor can perform fingerprint detection. However, opening a through hole in the surface of the cover of the mobile terminal not only affects the strength of the cover but also the integrity of the appearance of the screen of the mobile terminal. The optical fingerprint module, that is, the under-screen fingerprint module, is a fingerprint recognition module that can be installed under the cover plate without opening a through hole in the cover plate, and has high penetration and is welcomed by the industry.

In related technologies, the design of the fingerprint module under the screen is separate, that is, the fingerprint module is made separately. As shown in Figure 1 and Figure 2, the fingerprint module 102 is set under the display 1, and the electrical connection is through the fingerprint. The connection device on the FPC103 is connected to the display FPC104, and the structural connection is pre-laminated through the double-sided adhesive 105 on the fingerprint module. However, since the relative displacement of the fingerprint module 102 and the display screen 101 is very sensitive, it is necessary to point around the fingerprint module around the relatively rigid reinforcing glue 106 after assembly so that there is no displacement after bonding. However, it is precisely because the reinforcing adhesive itself is relatively hard. When the mobile terminal is impacted or dropped, the fingerprint module and the reinforcing adhesive 106 are likely to cause greater stress on the display screen, which causes the double-sided adhesive 105 and the reinforcing adhesive on the fingerprint module 102. The display position of the strong glue 106 corresponding to the display screen 101 is abnormal.

Summary of the Invention

An embodiment of the present disclosure provides a mobile terminal, which solves the problem of assembly stress between an optical fingerprint module and a display screen in the related art.

An embodiment of the present disclosure provides a mobile terminal including a display screen, a fingerprint module, and a flexible circuit board located below the fingerprint module. Among them,

The fingerprint module is clamped and fixed between the display screen and the flexible circuit board;

The display screen and the fingerprint module are respectively electrically connected to the flexible circuit board, and the flexible circuit board is also electrically connected to the main board of the mobile terminal.

In this way, the embodiments of the present disclosure can solve the problem of impact stress on the display screen when the terminal is dropped through the above technical solution, and prevent the display screen from being abnormal or damaged due to the impact stress.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the drawings used in the description of the embodiments of the present disclosure are briefly introduced below. Obviously, the drawings in the following description are just some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative labor.

FIG. 1 is a first schematic diagram of an assembly structure of an under-screen fingerprint module in the related art; FIG.

FIG. 2 shows the second schematic diagram of the assembly structure of the fingerprint module under the screen in the related art;

FIG. 3 is a first schematic diagram of an assembly structure of a display screen and a fingerprint module in a mobile terminal according to the present disclosure; FIG.

4 is a schematic cross-sectional view of A-A in FIG. 3;

FIG. 5 is a second schematic diagram of an assembly structure of a display screen and a fingerprint module in a mobile terminal according to the present disclosure; FIG.

Fig. 6 is a schematic sectional view of B-B in Fig. 5.

Among them, in the figure:

101, display screen, 102, fingerprint module, 103, fingerprint FPC, 104, display FPC, 105, double-sided adhesive, 106, reinforcing adhesive;

1. Display screen, 2. Fingerprint module, 3. Flexible circuit board, 4. First double-sided tape, 5. Foam layer, 6. Open structure, 7. Second double-sided tape.

detailed description

Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a thorough understanding of the present disclosure, and to fully convey the scope of the present disclosure to those skilled in the art.

In the description of this disclosure, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientations or positional relationships indicated by "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientations or The positional relationship is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality" is at least two, for example, two, three, etc., unless it is specifically and specifically defined otherwise.

In this disclosure, the terms "installation," "connected," "connected," and "fixed" should be understood broadly unless otherwise specified and defined, for example, they may be fixed or detachable. , Or integrated into one; it can be mechanical, electrical, or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

In this disclosure, unless explicitly stated and defined otherwise, the "first" or "down" of the second feature may include the first and second features in direct contact, and may also include the first and second features. Not directly, but through another characteristic contact between them. Moreover, the first feature is "above", "above", and "above" the second feature, including that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is higher in level than the second feature. The first feature is “below”, “below”, and “below” of the second feature, including the fact that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is less horizontal than the second feature.

The following disclosure provides many different implementations or examples for implementing different structures of the present disclosure. To simplify the disclosure of the present disclosure, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present disclosure. Furthermore, the present disclosure may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not itself indicate a relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

The following describes optional embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the optional embodiments described herein are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

As shown in FIGS. 3 to 6, an embodiment of the present disclosure provides a mobile terminal, which specifically includes a display screen 1, a fingerprint module 2, and a flexible circuit board 3 located below the fingerprint module 2. The fingerprint module 2 is sandwiched and fixed between the display screen 1 and the flexible circuit board 3. The display screen 1 and the fingerprint module 2 are respectively electrically connected to the flexible circuit board 3, and the flexible circuit board 3 is also electrically connected to the main board of the mobile terminal.

Among them, the flexible circuit board 3 completely covers the fingerprint module 2, and the display screen 1 and the flexible circuit board 3 clamp the fingerprint module 2.

The first end surface of the fingerprint module 2 is connected to the first surface of the display screen 1, and the second end surface of the fingerprint module 2 is connected to the first area of the flexible circuit board 3, wherein the first end surface is opposite to the second end surface. , The display screen 1 and the flexible circuit board 3 clamp the fingerprint module 2, and then the fingerprint module 2 achieves position stability under the clamping force of the display screen 1 and the flexible circuit board 3. Further, when the mobile terminal is dropped or receives an impact, due to the micro-elastic characteristics of the flexible circuit board 3, the impact force can be buffered, thereby reducing the damage of the display screen by the impact force. It is worth pointing out that the first surface of the display screen 1 referred to here refers to the back surface (or non-display surface) of the display screen 1, and the first end surface of the fingerprint module 2 refers to the surface where the fingerprint is sensed. The two end faces refer to the emitting surface of the induced light. The first area of the flexible circuit board 3 is reserved for the fingerprint module 2.

Further, the display screen 1 and the fingerprint module 2 are electrically connected to the flexible circuit board 3 respectively, and the flexible circuit board 3 is also electrically connected to the main board of the mobile terminal, that is, the display screen 1 and the fingerprint module 2 share the same flexible circuit board 3. Specifically, the flexible circuit board 3 is provided with a first circuit electrically connected to the fingerprint module 2 and a second circuit electrically connected to the display screen 1. That is, the external circuit of the fingerprint module 2 and the external circuit of the display screen 1 are made on the same flexible circuit board. For example, the external circuit of the fingerprint module 2 is made on the flexible circuit board FPC of the display screen 1, Then directly use the display FPC to connect to the main board of the mobile terminal to achieve the function of electrical fingerprint connection. Among them, FIG. 3 is a schematic diagram of the assembly between the display screen 1, the fingerprint module 2 and the flexible circuit board 3 when the display FPC is not folded back, and FIG. 5 is the display screen 1 when the display FPC is folded back. Assembly diagram between the fingerprint module 2 and the flexible circuit board 3.

In this way, by making the fingerprint module 2 directly on the flexible circuit board 3 of the display screen 1, and then attaching the flexible circuit board 3 and the fingerprint module 2 to the back of the display screen 1, when the mobile terminal drops, the fingerprint module 2 The impact stress on the display screen 1 can be dispersed to the entire flexible circuit board 3 through the connection, and due to the flexible elasticity of the flexible circuit board 3 itself, the impact stress can be further buffered, so that the impact stress on the display screen 1 can be reduced. Shock.

As shown in FIGS. 4 and 6, the first side of the fingerprint module 2 is adhered to the first surface of the display screen 1 through the first double-sided adhesive 4. The non-functional area of the fingerprint module 2 is covered with the first double-sided adhesive tape 4, which can achieve a large area of adhesion to the first surface of the display screen 1, ensure the relative position of the fingerprint module 2 and the display screen 1 to be stable, and save The dispensing process around the fingerprint module 2 eliminates the assembly process of the fingerprint module 2 and the display screen 1, which can save costs.

As shown in FIG. 6, a foam layer 5 is filled between the second area of the flexible circuit board 3 and the display screen 1. The foam layer 5 forms an opening structure 6, and the first area is located in the opening structure 6. The second area is an area on the flexible circuit board 3 other than the first area. A foam layer 5 is disposed on an area of the display screen 1 where the fingerprint module 2 is not fixed. Since the first area of the flexible circuit board 3 is in contact with the fingerprint module 2, the fingerprint module 2 is also located in the opening structure 6. For example, the opening structure 6 may be a fully-enclosed opening or a semi-enclosed opening.

Optionally, the opening structure 6 is provided around the fingerprint module 2, and the opening area of the opening structure 6 is larger than the projection area of the fingerprint module 2. As shown in FIG. 3 and FIG. 5, the foam layer 5 is provided with an opening structure 6, and the fingerprint module 2 is located in the opening structure 6, wherein the size of the opening structure 6 is slightly larger than that of the fingerprint module 2.

Further, the area of the display screen 1 corresponding to the opening structure 6 of the foam layer 5 forms a light-transmitting area, that is, the area of the display screen 1 corresponding to the fingerprint module 2 is a light-transmitting area, which can ensure the normal collection of fingerprints. .

As shown in FIG. 6, the foam layer 5 is bonded to the second area of the flexible circuit board 3 through the second double-sided adhesive 7. For example, the fingerprint module 2 and the peripheral circuit of the display screen 1 share the flexible circuit board of the display screen 1. (Display FPC), when the display FPC is folded, the second double-sided adhesive 7 directly adheres the display FPC to the foam layer 5 on the back of the display 1, and at the same time, the first on the fingerprint module 2 The double-sided adhesive 4 also adheres the fingerprint module to the back of the display screen 1, and realizes the FPC folding and the attachment of the fingerprint module 2 at one time. In this way, the structural connection between the fingerprint module 2 and the display screen 1 is achieved by double-sided adhesive, and the large area of the flexible circuit board 3 is used for bonding, which can further ensure that the relative position of the fingerprint module 2 and the display screen 1 is stable.

The display screen 1 and the fingerprint module 2 share the same flexible circuit board 3, for example, a certain area is reserved on the display FPC for arranging the peripheral wiring of the fingerprint module 2 and the external components of the fingerprint module 2. The flexible circuit board 3 includes a first circuit and a second circuit. The flexible circuit board 3 is provided with a transmission line of the fingerprint module 2 and a processing element of the fingerprint module 2. Specifically, the first circuit includes a peripheral trace (transmission line) of the fingerprint module 2 and an external component (a fingerprint signal processing element) of the fingerprint module 2.

In addition, the flexible circuit board 3 is further provided with: a transmission line of the display screen 1 and a processing element of the display screen 1. Specifically, the second circuit includes: a peripheral wiring (transmission line) of the display screen 1 and an external component of the display screen 1 ( Signal processing element).

The above structure can be applied to an ordinary fingerprint recognition module or an under-screen fingerprint recognition module. When the under-screen fingerprint recognition is implemented, a light-transmitting area corresponding to the position of the fingerprint module 2 is provided on the display screen 1.

As shown in FIGS. 3 and 5, the mobile terminal according to the embodiment of the present disclosure may further include a processor, which is electrically connected to the flexible circuit board 3. The processor may be disposed on the main board of the mobile terminal, and the flexible circuit board 3 is connected to the main board through a connector, and further connected to the processor through a line on the main board to implement a fingerprint recognition function and a screen display function.

The mobile terminal in the embodiment of the present disclosure may include: a mobile phone, a tablet computer, an e-book reader, an MP3 player, an MP4 player, or a laptop portable computer. By adopting the above assembly structure, the problem of impact stress on the display screen when the fingerprint is dropped can be solved, and the dispensing process around the fingerprint module can be omitted, and the assembly process of the fingerprint module and the display screen can be saved, thereby saving costs.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments may refer to each other.

Although alternative embodiments of the embodiments of the present disclosure have been described, those skilled in the art can make other changes and modifications to these embodiments once they know the basic inventive concepts. Therefore, the following claims are intended to be construed to include alternative embodiments and all changes and modifications that fall within the scope of the embodiments of the present disclosure.

Finally, it should be noted that in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between OR operations. Moreover, the terms "including", "comprising", or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or end device that includes a series of elements includes not only those elements but also those that are not explicitly listed Other elements, or elements inherent to such a process, method, article, or terminal. Without more restrictions, the elements defined by the sentence "including one ..." do not exclude that there are other identical elements in the process, method, article, or terminal device including the elements.

The above is an optional implementation of the present disclosure. It should be noted that for ordinary people in the technical field, several improvements and retouches can be made without departing from the principles described in the present disclosure. These improvements and retouches are also Within the scope of this disclosure.

Claims (10)

A mobile terminal includes a display screen (1), a fingerprint module (2), and a flexible circuit board (3) located below the fingerprint module (2), wherein: The fingerprint module (2) is sandwiched and fixed between the display screen (1) and the flexible circuit board (3); The display screen (1) and the fingerprint module (2) are electrically connected to the flexible circuit board (3), respectively, and the flexible circuit board (3) is also electrically connected to the main board of the mobile terminal. The mobile terminal according to claim 1, wherein the flexible circuit board (3) completely covers the fingerprint module (2). The mobile terminal according to claim 1 or 2, wherein the first end surface of the fingerprint module (2) is connected to the first surface of the display screen (1), and the first end of the fingerprint module (2) The two end surfaces are connected to the first region of the flexible circuit board (3). The mobile terminal according to claim 3, wherein the first end surface of the fingerprint module (2) is adhered to the first surface of the display screen (1) through a first double-sided adhesive (4). The mobile terminal according to claim 3, wherein a foam layer (5) is filled between the second area of the flexible circuit board (3) and the display screen (1), and the foam layer (5) ) Forms an opening structure (6), and the first region is located in the opening structure (6). The mobile terminal according to claim 5, wherein the opening structure (6) is provided around the fingerprint module (2), and the opening area of the opening structure (6) is larger than the fingerprint module (2) Projected area. The mobile terminal according to claim 5, wherein a region of the display screen (1) corresponding to the opening structure (6) of the foam layer (5) forms a light transmitting region. The mobile terminal according to claim 5, wherein the foam layer (5) is adhered to the second region of the flexible circuit board (3) through a second double-sided tape (7). The mobile terminal according to claim 1, wherein the flexible circuit board (3) is provided with a transmission line of the fingerprint module (2) and a processing element of the fingerprint module (2). The mobile terminal according to claim 9, wherein the flexible circuit board (3) is further provided with: a transmission line of the display screen (1) and a processing element of the display screen (1).

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