WO2019149083A1

WO2019149083A1 - Backlight module, display assembly and electronic device

Info

Publication number: WO2019149083A1
Application number: PCT/CN2019/072191
Authority: WO
Inventors: 陆忠恒
Original assignee: Oppo广东移动通信有限公司
Priority date: 2018-01-31
Filing date: 2019-01-17
Publication date: 2019-08-08
Also published as: CN110095835A

Abstract

A backlight module (93), a display assembly and an electronic device (90), wherein the backlight module (93) comprises: light guide plates (13, 43, 73) that comprise a light incident surface (133) and a light emergent surface (134); light sources (15, 45, 75) that are disposed at one side of the light incident surface (133); light homogenizing elements (14, 44, 74) that are disposed on the light emergent surface (134) of the light guide plates (13, 43, 73), one end of the light homogenizing elements (14, 44, 74) close to the light incident surface (133) being located in non-display zones (140, 440); and light shading layers (16, 46, 76) that are disposed in the non-display zones (140, 440) and that are located between the light guide plates (13, 43, 73) and the light homogenizing elements (14, 44, 74). Therefore, the light may be blocked from leaking from the non-display zones (140, 440) to the outside, and the phenomenon of light leakage of the backlight module (93) may further be avoided when the width of the non-display zones (140, 440) occupied by the backlight module (93) is reduced.

Description

Backlight module, display component and electronic device

[Technical Field]

The present application relates to the field of backlighting of electronic devices, and in particular to a backlight module, a display assembly, and an electronic device.

【Background technique】

At present, with the development of science and technology, electronic devices such as smart phones are increasingly becoming a necessity for people's lives.

The backlight module is an important component of the electronic device. At present, the backlight module of the portable electronic device such as a smart phone usually adopts a side-in type backlight module, that is, the light emitted by the light source is incident on the light guide plate from the side of the light guide plate, and is guided by the light guide plate. After that, the display panel of the electronic device is provided with a backlight. However, since the light source of the side-entry backlight module and some related structures need to be disposed on the side of the light guide plate, a large non-display area is occupied, which is disadvantageous for narrowing. The realization of the border and the full screen, how to shorten the width of the backlight module in the non-display area without affecting the normal display of the backlight module and the display panel has become a focus of attention.

[Summary of the Invention]

In one aspect, the embodiment of the present application provides a backlight module, the backlight module includes: a light guide plate, including a light incident surface and a light exit surface; a light source disposed on a side of the light incident surface; and a light homogenizing component disposed on the light guide plate On the light-emitting surface, one end of the light-shaping element near the light-incident surface is located in the non-display area; the light-shielding layer is disposed in the non-display area and is located between the light guide plate and the light-shaping element.

On the other hand, the embodiment of the present application further provides a display component, where the display component includes a display module and a backlight module for providing backlight for the display module; the backlight module includes:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on a side of the light incident surface;

a light-collecting element disposed on a light-emitting surface of the light guide plate, wherein an end of the light-harvesting element adjacent to the light-incident surface is located in a non-display area;

a light shielding layer disposed in the non-display area and located between the light guide plate and the light homogenizing element.

In addition, the embodiment of the present application further provides an electronic device, the electronic device includes a rear case, a middle frame, and a display component; the middle frame is fixedly connected to the rear case, and the display component is fixed to the middle frame; The display module includes a display module and a backlight module for providing backlighting for the display module; the backlight module includes:

a light source disposed on a side of the light incident surface;

[Description of the Drawings]

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

1 is a schematic structural view of a backlight module according to a first embodiment of the present application;

2 is a schematic structural view of a light homogenizing element of the backlight module shown in FIG. 1;

3 is a schematic diagram of a shading principle of a backlight module of a backlight module according to a first embodiment of the present application;

4 is a cross-sectional structural view of a backlight module according to a second embodiment of the present application;

5 is a schematic cross-sectional structural view of a backlight module according to a second embodiment of the present application;

6 is a schematic structural view of a diffusion film and a second brightness enhancement film according to a second embodiment of the present application;

7 is a cross-sectional structural view of a backlight module according to a third embodiment of the present application;

8 is a schematic structural view of a first brightness enhancement film according to a third embodiment of the present application;

FIG. 9 is a schematic exploded view of an electronic device according to an embodiment of the present application.

【Detailed ways】

The technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting. In addition, it should be noted that, for the convenience of description, only some but not all of the structures related to the present application are shown in the drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

The terms "first", "second", and the like in this application are used to distinguish different objects, and are not intended to describe a particular order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

References to "an embodiment" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The appearances of the phrases in various places in the specification are not necessarily referring to the same embodiments, and are not exclusive or alternative embodiments that are mutually exclusive. Those skilled in the art will understand and implicitly understand that the embodiments described herein can be combined with other embodiments.

An embodiment of the present application provides a backlight module, where the backlight module includes:

a light source disposed on a side of the light incident surface;

Wherein, the light shielding layer is a black ink layer formed by a screen printing process.

The light concentrating element includes a diffusion film, a first brightness enhancement film, and a second brightness enhancement film, which are sequentially disposed on the light exit surface, and the diffusion film, the first brightness enhancement film, and the second brightness enhancement film are mutually The film layer is a separate layer, wherein the light shielding layer is disposed between the diffusion film and the light guide plate.

The backlight module further includes an FPC circuit board disposed on the light source and electrically connected to the light source, and an FPC circuit board disposed on the FPC circuit board and the guide. Between the light plates to fix the FPC circuit board on the light guide plate.

Wherein the diffusion film comprises a diffusion body and a diffusion extension extending from the diffusion body toward the FPC fixing tape;

The side of the diffusion body is in contact with the FPC fixing tape, and the diffusion extension is disposed on the FPC fixing tape.

Wherein, the diffusion extension comprises two, respectively located on two sides of the diffusion film.

Wherein, on both sides of the diffusion film, the light shielding layer is disposed between the diffusion extension portion and the FPC fixing tape, and between the two sides, the light shielding layer is disposed on the diffusion body and the Between the light guide plates.

The second brightness enhancement film includes a brightness enhancement body and a brightness enhancement extension extending from the light enhancement body toward the FPC fixing tape, the first brightness enhancement film is disposed on the diffusion body, and the brightness enhancement body is disposed at On the first brightness enhancement film, the brightness enhancement extension is disposed on the diffusion extension.

The backlight module further includes a light shielding tape disposed on the second brightness enhancement film for fixing the second brightness enhancement film.

Another aspect of the present application provides a display component, where the display component includes a display module and a backlight module for providing backlight for the display module. The backlight module includes:

a light source disposed on a side of the light incident surface;

The side surface of the diffusion body is in contact with the FPC fixing tape, and the diffusion extension is disposed on the FPC fixing tape.

An embodiment of the present application further provides an electronic device including a rear case, a middle frame, and a display component; the middle frame is fixedly connected to the rear case, and the display component is fixed to the middle frame; The display module includes a display module and a backlight module for providing backlighting to the display module; the backlight module includes:

a light source disposed on a side of the light incident surface;

The electronic device further includes a cover plate, and the cover plate is disposed on the display module.

It should be noted that when a portable electronic device such as a smart phone pursues a narrow bezel or a full screen, it is usually tried to omit some non-optical components, that is, components that do not substantially participate in the transmission of light and light, for example, as separate The component of the shading function is removed, thereby saving space for the component, thereby further designing a narrow bezel or a full screen. For example, in a backlight module of a portable electronic device such as a smart phone, a light shielding member disposed on a light guide plate and located on a side surface of the light homogenizing element can be removed. However, components that remove the shading function will have a problem of light leakage, which will ultimately affect the user experience. The embodiments of the present application provide a solution for the backlight module and the electronic device to solve the above problem. For details, refer to the following embodiments provided by the present application:

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application. In this embodiment, the backlight module includes a back frame 11, a reflection sheet 12, a light guide plate 13, a light homogenizing element 14, a light source 15, and a light shielding layer 16.

The back frame 11 is a box-shaped structure with an open side. The back frame 11 includes a bottom wall 111 and a side wall 112. The bottom wall 111 is bent and connected to the side wall 112. The bottom wall 111 and the side wall 112 enclose a receiving cavity. The material of the back frame 11 may be metal, for example, iron, aluminum, or the like, or may be plastic.

The reflective sheet 12 is disposed on the bottom wall 111 of the back frame 11 and is located inside the accommodating cavity. The reflection sheet 12 can reflect incident light.

The light guide plate 13 is disposed on the reflective sheet 12 and located inside the accommodating cavity. The light guide plate 13 includes a light incident end portion 131 and a light guide plate main body portion 132. The light incident end portion 131 is provided with a light incident surface 133, and the light guide plate main body portion 132 is provided with a light exit surface 134. The thickness of the light incident end portion 131 is greater than the thickness of the light guide plate main body 132, and the thickness of the light incident end portion 131 gradually decreases from the light incident surface 133 to the direction away from the light incident surface 133, and the thickness of the light guide plate main portion 132 is uniform, that is, the thickness everywhere. equal.

The light source 15 is disposed on the side of the light incident surface 131, and is disposed on a region where the reflection sheet 12 is not covered by the light guide plate 13. Light source 15 can be an LED light.

The light homogenizing element 14 is disposed on the light emitting surface 134 of the light guide plate 13 , and one end of the light homogenizing element 14 adjacent to the light incident surface 132 is located in the non-display area 140 .

The light emitted from the light source 15 is incident on the light incident end portion 131 of the light guide plate 13 through the light incident surface 132 of the light guide plate 13, and the light incident end portion 131 guides the light into the light guide plate main body portion 132 by the wedge structure, and the light guide plate main body portion The guide light is transmitted to the entire light guide plate main body 132 and then transmitted to the light homogenizing element 14. The light homogenizing element 14 diffuses, condenses, and brightens the incident light to be an output of the backlight module. The light leaking from the side of the light guide plate 132 away from the light exit surface 134 is reflected back into the light guide plate 13 by the reflective sheet 12.

It should be understood that the light output from the backlight module will be displayed in the display area to form the desired image. At present, in order to pursue high-screen ratio, that is, wide-screen or even full-screen design, it will impose extremely demanding restrictions on the design width of the non-display area. The design of the narrow frame usually means that some of the light is not emitted and transmitted. Sexually significant component removal, such as some components that only serve as a shading effect. This can easily lead to light leakage in the non-display area. In this regard, in the present embodiment, a light shielding layer is provided in the non-display area to avoid the problem of light leakage.

Specifically, the light shielding layer 16 is disposed in the non-display area 140 and located between the light guide plate 13 and the light homogenizing element 14. The light emitted from the light source 15 can be blocked from leaking to the outside in the non-display area 140, so that the backlight module can be prevented from leaking light while reducing the width of the non-display area occupied by the backlight module.

The light shielding layer 16 is a black ink layer formed by a screen printing process. It may be formed on the surface of the light-homogenizing member 14 close to the light guide plate 13, or may be formed on the surface of the light guide plate 13 close to the light-receiving member 14. In other embodiments, the light shielding layer 16 can be formed by spraying. It should be understood that the light shielding layer 16 can also be formed by other processes, which is not limited by the embodiment of the present application.

Referring to FIG. 1 , the light-homogenizing element 14 includes a diffusion film 141 , a first brightness enhancement film 142 , and a second brightness enhancement film 143 which are sequentially disposed on the light-emitting surface 134 . The diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are mutually independent film layers. That is to say, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are separately mounted and mounted together. The shapes of the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 may be the same, and may both have a square structure, as shown in FIG. 1 is a cross-sectional view of the backlight module taken along the A-A position of the light homogenizing element of FIG. 2, with the A-A position passing through the light source 15. It is to be understood that in the present embodiment, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are identical in cross-section through the light source 15.

The first brightness enhancement film 142 may be referred to as a lower brightness enhancement film, and the second brightness enhancement film 143 may be referred to as an upper brightness enhancement film.

The light shielding layer 16 is disposed between the diffusion film 141 and the light guide plate 13. More specifically, the light shielding layer 16 is disposed between the diffusion film 141 and the light guide plate main body portion 132 of the light guide plate 13.

Further, the light shielding layer 16 may be provided as a black ink layer having an adhesive agent, and the diffusion film 141 is adhered and fixed on one surface, and the light guide plate 13 is attached and fixed on the other surface. Thereby, the diffusion film 141 can be further fixed to the light guide plate 13.

The backlight module further includes an FPC (Flexible Printed Circuit) circuit board 17 and an FPC fixing tape 18. The FPC board 17 is disposed on the light source 15 and is electrically connected to the light source 15 to transmit an externally supplied control signal to the light source 15. Further, the FPC board 17 is spaced apart from the light homogenizing elements 14 with a gap a therebetween. The reserved gap a is used to match the assembly error on the one hand, and the backlight module can still be used normally under a certain degree of thermal deformation.

The FPC fixing tape 18 is disposed between the FPC board 17 and the light guide plate 13 to fix the FPC board 17 to the light guide plate 13. Specifically, the FPC fixing tape 18 is an adhesive tape having an adhesive on both sides, one surface of which is adhered and fixed to the FPC circuit board 17, and the other surface is adhered and fixed to the light guide plate 13. In this embodiment, the FPC fixing tape 18 may also be spaced apart from the light homogenizing element 14 to form a portion of the gap a.

Further, the backlight module further includes a light shielding tape 19 disposed on the FPC circuit board 17 and disposed on a portion of the second brightness enhancement film 143 at the non-display area 140.

The light shielding tape 19 may include a first light blocking portion 191 and a second light blocking portion 192. The first light blocking portion 191 covers the FPC circuit board 17, and the second light blocking portion 192 covers the second light-increasing film 143. The thickness of the first light blocking portion 191 may be greater than the thickness of the second light blocking portion 192. The second light shielding portion 192 shields the portion of the second brightness enhancement film 143 located at the non-display area 140, and applies a suitable force to the second brightness enhancement film 143, so that the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 can be fixed on the light-emitting surface 134 of the light guide plate 13.

Further, the light-shielding tape 191 is provided with an adhesive on at least the side surface of the second light-shielding portion 192 close to the second light-increasing film 143, and the second light-increasing film 143 is further fixed by bonding. As described above, since the diffusion film 141 is fixed to the light guide plate 13 by the light shielding layer 16, the first brightness enhancement film 142 is fixed by being sandwiched by the diffusion film 141 and the second brightness enhancement film 143 which are fixed to each other.

Further, the backlight module further includes a middle frame 21 and an outer frame 22. The outer frame 22 fixes the light-shielding tape 19 and the FPC circuit board 17 on the side (the left side shown in the drawing) of the light-shielding tape 19 and the FPC board 17 away from the second brightness enhancement film 143.

The middle frame 21 is located in the accommodating cavity of the back frame 11 and is disposed on a side of the light source 15 away from the light incident surface 133 for supporting the FPC circuit board 17 and the light shielding tape 19. The outer frame 22 is located outside the accommodating cavity of the back frame 11. The middle frame 21 and the outer frame 22 can be made of a metal material such as iron, aluminum, or the like. The middle frame 19 can be integrally formed with the outer frame 21.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of the shading principle of the backlight module of the backlight module according to the first embodiment of the present application.

As shown in FIG. 3, the light S1 is originally emitted from the light source 15, and is directly emitted through the reserved gap a to cause light leakage in the non-display area 140. The light may be blocked by the light shielding layer 16 without directly emitting the backlight module, thereby avoiding direct shooting. Enter the human eye. The arrangement of the light shielding layer 16 does not occupy a separate width space in the width direction, and therefore, the thickness of the non-display area of the backlight module can be reduced. The non-display area refers to an area covered by the light-shielding tape 19, and the display area is an area not covered by the light-shielding tape 19.

In the present embodiment, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are independent of each other, that is, the three are non-composite films. In other embodiments, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 may also be configured as a composite film, for example, the first brightness enhancement film 142 and the second brightness enhancement film 143 are integrated film layers, and the integrated film layer The diffusion film 141 is independent of each other. Alternatively, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are integral film layers.

In addition, the light shielding layer 16 may be disposed at other positions, for example, at any one or more of the following positions: a side of the light homogenizing element 14 adjacent to the FPC circuit board 17, a diffusion film 141 and the first brightness enhancement film 142, The first brightness enhancement film 142 and the second brightness enhancement film 143 are between the second brightness enhancement film 143 and the light shielding tape 19.

Referring to FIG. 4 and FIG. 6 , FIG. 4 is a cross-sectional structural view of the backlight module of the second embodiment of the present invention taken along the CC direction of the diffusion film and the second brightness enhancement film shown in FIG. 6 , and FIG. 2 is a schematic cross-sectional structural view of the backlight module taken along the BB direction of the diffusion film and the second brightness enhancement film shown in FIG. 6 . Fig. 6 is a schematic view showing the structure of a diffusion film and a second brightness enhancement film of a second embodiment of the present application.

First, as shown in FIG. 4 , in the embodiment, the backlight module further includes a back frame 41 , a reflective sheet 42 , a light guide plate 43 , a light leveling element 44 , a light source 45 , a light shielding layer 46 , an FPC circuit board 47 , and an FPC fixing tape 48 . , a light shielding tape 49, a middle frame 51 and an outer frame 52. The structures of the back frame 41, the reflection sheet 42, the light guide plate 43, the light source 45, the light shielding layer 46, the FPC circuit board 47, the light shielding tape 49, the middle frame 51, and the outer frame 52 are respectively configured with the back frame 11 and the reflection described above. The sheet 12, the light guide plate 13, the light source 15, the light shielding layer 16, the FPC circuit board 17, the light shielding tape 19, the middle frame 21, and the outer frame 22 are the same, and will not be described herein.

The FPC fixing tape 48 of the present embodiment further extends from the direction of the FPC board 47 toward the direction of the light homogenizing element 44. Thus, the present embodiment only has a gap b between the FPC board 47 and the light homogenizing element 44.

The FPC fixing tape 48 may be provided with an adhesive on the upper surface and the lower surface to fix the FPC circuit board 47 to the light guide plate 43, and may further be provided with a black light-shielding material or a black light-shielding material on the upper surface or the lower surface to shield the tape. The role.

Specifically, the FPC fixing tape 48 may be a black tape. The FPC fixing tape 48 may also be provided with black ink on its upper or lower surface to function as a light shield. The setting of the black ink may be the same as that described above, and will not be described herein.

The light-homogenizing element 44 of the present embodiment includes a diffusion film 441, a first brightness enhancement film 442, and a second brightness enhancement film 443 which are sequentially disposed on the light-emitting surface of the light guide plate 43. The diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 are mutually independent film layers. That is to say, the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 are separately mounted and mounted together. The first brightness enhancement film 142 may be referred to as a lower brightness enhancement film, and the second brightness enhancement film 143 may be referred to as an upper brightness enhancement film.

The light shielding layer 46 is disposed between the diffusion film 441 and the light guide plate 43.

Please refer to Figure 6 together. The diffusion film 441 includes a diffusion body 4411 and a diffusion extension portion 4412 extending from the diffusion body 4411 in the direction of the FPC fixing tape 48. The side surface of the diffusion body 4411 is in contact with the FPC fixing tape 48 as shown in FIG. The diffusion extension 4412 is disposed on the FPC fixing tape 48 as shown in FIG.

The diffusion extension 4412 includes two, which are respectively located on both sides of the diffusion film 441. It should be understood that in other embodiments, the number of diffusion extensions 4412 may also be other, such as one or three, and the like.

On both sides of the diffusion film 44, i.e., the position of the diffusion extension 4412, the light shielding layer 46 is disposed between the diffusion extension 4412 and the FPC fixing tape 48 as shown in FIG. Between the two sides, that is, the position of the diffusion body 4411, the light shielding layer 46 is disposed between the diffusion body 4411 and the light guide plate 43, as shown in FIG.

Referring to FIG. 4 and FIG. 6 together, the second brightness enhancement film 443 includes a brightness enhancement body 4431 and a brightness enhancement extension portion 4432 extending from the brightness enhancement body 4431 toward the FPC fixing tape 48. The first brightness enhancement film 442 is disposed on the diffusion body 4411, the light enhancement body 4431 is disposed on the first brightness enhancement film 442, and the brightness enhancement extension portion 4432 is disposed on the diffusion extension portion 4412. The shape of the diffusion main body 4411, the first brightness enhancement film 442, and the brightness enhancement body 4431 may be the same.

Similarly, the brightness enhancement extension 4432 may also include two, which are respectively located on two sides of the second brightness enhancement film 443. In this embodiment, the position and shape of the brightness enhancement extension 4432 can be the same as that of the diffusion extension 4412. It should be understood that in other embodiments, the number of brightness enhancement extensions 4432 may also be other, such as one or three, and the like. The shape and size of the brightness enhancement extension 4432 may also be other, and details are not described herein again.

As described above, the FPC fixing tape 48 of the present embodiment can block the light emitted from the light source 45 from passing directly into the gap b, thereby preventing leakage from the gap b. Further, the light-shielding tape 46 can prevent leakage of light at other positions of the non-display area 440.

It should be understood that the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 of the present embodiment may also be a composite structure, as described above, and details are not described herein again.

For the same reason, the light shielding layer 46 of the present embodiment may also be disposed at other positions, as described above, and details are not described herein again.

Referring to FIG. 7 and FIG. 8 , FIG. 7 is a cross-sectional structural view of the backlight module of the third embodiment of the present invention taken along the line D-D of the first brightness enhancement film illustrated in FIG. 8 .

First, as shown in FIG. 7 , in this embodiment, the backlight module still includes a back frame 71 , a reflective sheet 72 , a light guide plate 73 , a light leveling element 74 , a light source 75 , a light shielding layer 76 , an FPC circuit board 77 , and an FPC fixing tape 78 . , a light shielding tape 79, a middle frame 81 and an outer frame 82. The structures of the back frame 71, the reflection sheet 72, the light guide plate 73, the light source 75, the light shielding layer 76, the FPC circuit board 77, the light shielding tape 79, the middle frame 81, and the outer frame 82 are respectively configured with the back frame 11 and the reflection described above. The sheet 12, the light guide plate 13, the light source 15, the light shielding layer 16, the FPC circuit board 17, the light shielding tape 19, the middle frame 21, and the outer frame 22 are the same, and will not be described herein.

The FPC fixing tape 78 of the present embodiment further extends from the direction of the FPC board 77 toward the direction of the light-homogenizing element 74, and is in contact with the side surface of the diffusion film 741. Thus, this embodiment only has a gap c between the FPC board 77 and the light homogenizing element 74.

The FPC fixing tape 78 may be provided with an adhesive on the upper surface and the lower surface to fix the FPC circuit board 77 to the light guide plate 73, and may further be provided with a black light-shielding material or a black light-shielding material on the upper surface or the lower surface to shield the light. The role.

Specifically, the FPC fixing tape 78 may be made of black tape. The FPC fixing tape 78 may also be provided with black ink on its upper or lower surface to function as a light shield. The setting of the black ink may be the same as that described above, and will not be described herein.

The light homogenizing element 74 of the present embodiment includes a diffusion film 741, a first light-increasing film 742, and a second light-increasing film 743 which are sequentially disposed on the light-emitting surface of the light guide plate 73. The diffusion film 741, the first brightness enhancement film 742, and the second brightness enhancement film 743 are mutually independent film layers. That is to say, the diffusion film 741, the first brightness enhancement film 742, and the second brightness enhancement film 743 are separately mounted and mounted together. The first brightness enhancement film 742 may be referred to as a lower brightness enhancement film, and the second brightness enhancement film 743 may be referred to as an upper brightness enhancement film.

The light shielding layer 76 is disposed between the diffusion film 741 and the light guide plate 73.

Please refer to Figure 8 together. The first brightness enhancement film 742 includes a light-increasing body 7421 and a brightness enhancement extension portion 7422 extending from the light-increasing body 7421 in the direction of the FPC fixing tape 48. The light-increasing body 7421 is disposed on the diffusion film 741, the brightness enhancement extension portion 7422 is disposed on the FPC fixing tape 48, and the second brightness enhancement film 743 is disposed on the light-increasing body 7421. The shape of the diffusion film 741, the light-increasing body 7422, and the second brightness enhancement film 743 may be the same.

It should be understood that FIG. 7 is a schematic cross-sectional view of FIG. 8 taken along the direction of the brightness enhancement extension 7422 of the first brightness enhancement film 742. The cross-sectional structure taken along the direction of the light-increasing body 7421 of the first brightness enhancement film 742 is the same as that of FIG. 5, and will not be described herein.

As described above, the FPC fixing tape 78 of the present embodiment can block the light emitted from the light source 75 from passing directly into the gap c, thereby preventing leakage from the gap c. Further, the light-shielding tape 76 can prevent leakage of light at other locations in the non-display area.

It should be understood that the diffusion film 741, the first brightness enhancement film 742, and the second brightness enhancement film 743 of the present embodiment may also be a composite structure, as described above, and details are not described herein again.

For the same reason, the light shielding layer 76 of the embodiment may be disposed at other positions, as described above, and details are not described herein again.

Please refer to FIG. 9. FIG. 9 is a schematic exploded view of an electronic device according to an embodiment of the present application. In this embodiment, the electronic device 90 may be a smart phone. In other embodiments, the electronic device may also be a tablet computer, a palmtop computer, a smart watch, or the like.

In the embodiment, the electronic device 90 includes a rear case 91, a middle frame 92, a backlight module 93, a display module 94, and a cover plate 95.

The middle frame 92 is fixedly coupled to the rear case 91.

The display module 94 is stacked on the backlight module 93, and the display module 94 and the backlight module 93 are both fixed to the middle frame 92.

The backlight module 93 is used to provide backlighting for the display module 94. The display module 94 and the backlight module 93 constitute a display assembly.

The display module 94 can be a liquid crystal display panel or other display panel.

The cover plate 95 is mounted on the display module 94. The cover plate 95 can be a clear glass cover, and the cover plate 95 can be opaque in the non-display area. For example, the cover plate 95 is coated with a light-shielding ink in the non-display area.

It should be understood that other structures of the electronic device, such as a circuit board or the like, may be disposed between the rear case 91 and the middle frame 92. Since the present application does not relate to improvements to these components, it will not be specifically described herein.

In other embodiments, the electronic device 90 can also adopt other structures. The description of the structure of the electronic device 90 does not limit the scope of the present application.

The above description is only the embodiment of the present application, and thus does not limit the scope of the patent application, and the equivalent structure or equivalent process transformation of the specification and the drawings of the present application, or directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of this application.

Claims

A backlight module, wherein the backlight module comprises:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on a side of the light incident surface;

a light-collecting element disposed on a light-emitting surface of the light guide plate, wherein an end of the light-harvesting element adjacent to the light-incident surface is located in a non-display area;

a light shielding layer disposed in the non-display area and located between the light guide plate and the light homogenizing element.
The backlight module of claim 1, wherein the light shielding layer is a black ink layer formed by a screen printing process.
The backlight module of claim 1 , wherein the light-shaping element comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film, which are sequentially disposed on the light-emitting surface, the diffusion film, the diffusion film The first brightness enhancement film and the second brightness enhancement film are mutually independent film layers, wherein the light shielding layer is disposed between the diffusion film and the light guide plate.
The backlight module of claim 3, wherein the backlight module further comprises an FPC circuit board and an FPC fixing tape, the FPC circuit board is disposed on the light source and electrically connected to the light source, the FPC A fixing tape is disposed between the FPC circuit board and the light guide plate to fix the FPC circuit board on the light guide plate.
The backlight module according to claim 4, wherein the diffusion film comprises a diffusion body and a diffusion extension extending from the diffusion body toward the FPC fixing tape;

The side surface of the diffusion body is in contact with the FPC fixing tape, and the diffusion extension is disposed on the FPC fixing tape.
The backlight module of claim 5, wherein the diffusion extension comprises two, respectively located on opposite sides of the diffusion film.
The backlight module according to claim 6, wherein the light shielding layer is disposed between the diffusion extending portion and the FPC fixing tape on both sides of the diffusion film, between the two sides The light shielding layer is disposed between the diffusion body and the light guide plate.
The backlight module of claim 5, wherein the second brightness enhancement film comprises a brightness enhancement body and a brightness enhancement extension extending from the light enhancement body toward the FPC fixing tape, the first brightness enhancement film is disposed On the diffusion body, the brightness enhancement body is disposed on the first brightness enhancement film, and the brightness enhancement extension is disposed on the diffusion extension.
The backlight module of claim 2, wherein the backlight module further comprises a light shielding tape disposed on the second brightness enhancement film for fixing the second brightness enhancement film.
A display module, comprising: a display module and a backlight module for providing backlighting for the display module; the backlight module comprises:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on a side of the light incident surface;

a light-collecting element disposed on a light-emitting surface of the light guide plate, wherein an end of the light-harvesting element adjacent to the light-incident surface is located in a non-display area;

a light shielding layer disposed in the non-display area and located between the light guide plate and the light homogenizing element.
The display module of claim 10, wherein the light shielding layer is a black ink layer formed by a screen printing process.
The display module according to claim 10, wherein the light-harvesting element comprises a diffusion film, a first brightness enhancement film and a second brightness enhancement film, which are sequentially disposed on the light-emitting surface, the diffusion film, the first A light-increasing film and the second light-increasing film are mutually independent film layers, wherein the light shielding layer is disposed between the diffusion film and the light guide plate.
The display module of claim 12, wherein the backlight module further comprises an FPC circuit board and an FPC fixing tape, the FPC circuit board is disposed on the light source and electrically connected to the light source, and the FPC is fixed An adhesive tape is disposed between the FPC circuit board and the light guide plate to fix the FPC circuit board on the light guide plate.
The display assembly according to claim 13, wherein the diffusion film comprises a diffusion body and a diffusion extension extending from the diffusion body toward the FPC fixing tape;

The side surface of the diffusion body is in contact with the FPC fixing tape, and the diffusion extension is disposed on the FPC fixing tape.
The display assembly of claim 14 wherein said diffusion extension comprises two, each on either side of said diffusion film.
The display module according to claim 15, wherein on both sides of the diffusion film, the light shielding layer is disposed between the diffusion extension and the FPC fixing tape between the two sides, The light shielding layer is disposed between the diffusion body and the light guide plate.
The display module according to claim 14, wherein the second brightness enhancement film comprises a brightness enhancement body and a brightness enhancement extension extending from the light enhancement body toward the FPC fixing tape, the first brightness enhancement film being disposed at The light-increasing body is disposed on the first light-increasing film, and the light-increasing extension portion is disposed on the diffusion extending portion.
The display module according to claim 11, wherein the backlight module further comprises a light shielding tape, and the light shielding tape is disposed on the second brightness enhancement film for fixing the second brightness enhancement film.
An electronic device, comprising: a rear case, a middle frame, and a display assembly; the middle frame is fixedly connected to the rear case, the display component is fixed to the middle frame; and the display component A display module and a backlight module for providing backlighting to the display module; the backlight module includes:

a light guide plate comprising a light incident surface and a light exit surface;

a light source disposed on a side of the light incident surface;

a light-collecting element disposed on a light-emitting surface of the light guide plate, wherein an end of the light-harvesting element adjacent to the light-incident surface is located in a non-display area;

a light shielding layer disposed in the non-display area and located between the light guide plate and the light homogenizing element.
The electronic device according to claim 19, wherein the electronic device further comprises a cover, and the cover is disposed on the display module.