CN108019668B

CN108019668B - Backlight module and electronic device

Info

Publication number: CN108019668B
Application number: CN201810104823.7A
Authority: CN
Inventors: 陆忠恒
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2021-04-27
Anticipated expiration: 2038-01-31
Also published as: CN108019668A

Abstract

The application discloses backlight module and electronic device. The backlight module includes: the light guide plate comprises a light incident surface and a light emergent surface; the light source is arranged on one side of the light incident surface; the light homogenizing element comprises a diffusion film, a first light intensifying film and a second light intensifying film which are sequentially arranged on the light emitting surface, and one end, close to the light incident surface, of the light homogenizing element is positioned in the non-display area; and the shading layer is arranged in the non-display area, is arranged between the light guide plate and the diffusion film, and is arranged between the diffusion film and the first brightness enhancement film. Therefore, the backlight module can be prevented from leaking light under the condition of reducing the width of the non-display area occupied by the backlight module.

Description

Backlight module and electronic device

Technical Field

The present disclosure relates to backlight devices, and particularly to a backlight module and an electronic device.

Background

At present, with the development of science and technology, electronic devices such as smart phones and the like are gradually becoming necessities of life of people.

Backlight unit is the important part of electron device, the backlight unit of portable electron device such as smart mobile phone at present adopts the formula backlight unit of side income usually, the light that the light source sent jets into the light guide plate from the light guide plate side promptly, provide back light for electron device's display panel after the light guide plate leaded light, however because this kind of formula backlight unit's of side income light source and some relevant structures need set up the side at the light guide plate, consequently, occupy great non-display area, be unfavorable for the realization of narrow frame and comprehensive screen, how to shorten backlight unit in the width of non-display area and do not influence the normal demonstration of backlight unit and display panel, become the focus problem that people paid attention to.

Disclosure of Invention

In one aspect, an embodiment of the present application provides a backlight module, which includes: the light guide plate comprises a light incident surface and a light emergent surface; the light source is arranged on one side of the light incident surface; the light homogenizing element comprises a diffusion film, a first light intensifying film and a second light intensifying film which are sequentially arranged on the light emitting surface, and one end, close to the light incident surface, of the light homogenizing element is positioned in the non-display area; and the shading layer is arranged in the non-display area, is arranged between the light guide plate and the diffusion film, and is arranged between the diffusion film and the first brightness enhancement film.

On the other hand, an embodiment of the present application further provides an electronic device, which includes the backlight module described above.

This application embodiment is through in the non-display area to between light guide plate and diffusion barrier, and set up the light shield layer between diffusion barrier and first membrane that adds lustre to, can block that the light reveals to the outside from the non-display area, consequently can avoid backlight unit to appear the phenomenon of light leak under the condition of the width that reduces the non-display area that backlight unit occupy.

Drawings

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

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

FIG. 3 is a schematic view illustrating a light-shielding principle of a light-shielding layer of a backlight module according to a first embodiment of the present disclosure;

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

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

FIG. 6 is a schematic view of the diffusion film and second brightness enhancement film of a second embodiment of the present application;

FIG. 7 is a schematic cross-sectional view illustrating a backlight module according to a third embodiment of the present application;

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

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

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

It should be noted that when a portable electronic device such as a smart phone pursues a narrow bezel or a full-face screen, it is usually endeavored to omit some non-optical elements, i.e. elements that do not substantially participate in light emission and light transmission, for example, elements that only serve as a separate light shielding function are removed, so that the space of the elements can be saved, and the design of the narrow bezel or the full-face screen is further proceeded. For example, in a backlight module of a portable electronic device such as a smartphone, a light shielding member provided on a light guide plate and located on a side surface of a light uniformizing member may be removed. However, the element without the light shielding function will cause a problem of light leakage, which ultimately affects the user experience. Embodiments of the present application provide a backlight module and an electronic device to solve the above problems, and refer to the following embodiments provided in the present application:

referring to fig. 1, fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application. In the present embodiment, the backlight module includes a back frame 11, a reflective sheet 12, a light guide plate 13, a light uniformizing element 14, a light source 15 and a light shielding layer 16.

The back frame 11 is a box-shaped structure with an opening on one side, the back frame 11 includes a bottom wall 111 and a side wall 112, the bottom wall 111 is connected with the side wall 112 in a bending manner, and the bottom wall 111 and the side wall 112 enclose an accommodating cavity. The back frame 11 may be made of metal, such as iron or aluminum, or plastic.

The reflective sheet 12 is disposed on the bottom wall 111 of the back frame 11 and located inside the accommodating cavity. The reflective sheet 12 may 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 131 and a light guide plate main body 132, the light incident end 131 is provided with a light incident surface 133, and the light guide plate main body 132 is provided with a light emitting surface 134. The thickness of the light incident end 131 is greater than that of the light guide plate main body 132, and the thickness of the light incident end 131 gradually decreases from the light incident surface 133 to the direction away from the light incident surface 133, so that the thickness of the light guide plate main body 132 is uniform, that is, equal everywhere.

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

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

The light emitted from the light source 15 enters the light entrance end 131 of the light guide plate 13 through the light entrance surface 133 of the light guide plate 13, the light entrance end 131 guides the light into the light guide plate main body 132 by using the wedge structure, the light guide plate main body 132 guides the light to spread over the whole light guide plate main body 132 and then transmits the light to the light uniformizing element 14, and the incident light is diffused, condensed, brightened and the like by the light uniformizing element 14 and then is output as a backlight module. Part of the light leaking from the side of the light guide plate 13 away from the light exit surface 134 is reflected back into the light guide plate 13 by the reflective sheet 12.

It will be appreciated that the light output from the backlight will be displayed in the display area to form the desired image. In order to seek a high screen ratio, i.e. a wide screen or even a full screen, it will put a very demanding restriction on the design width of the non-display area, and the design of the narrow bezel usually removes some elements that are not essential for the emission and transmission of light, for example, some elements that only block light. This easily causes a light leakage phenomenon in the non-display region. In contrast, in the present embodiment, a light-shielding layer is disposed in the non-display region to avoid the problem of light leakage.

Specifically, the light uniformizing 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 output surface 134. The first brightness enhancement film 142 and the second brightness enhancement film 143 are integrated films 144, and the integrated films 144 and the diffusion film 141 are independent films.

That is, the first brightness enhancement film 142 and the second brightness enhancement film 143 are integrally formed as an integral film layer 144, and the integral film layer 144 is mounted together after being separately completed from the diffuser film 141. The diffusion film 141 and the integral film 144 may have the same shape, and may have a square structure, as shown in fig. 2. Wherein, fig. 1 is a cross-sectional view of the backlight module taken along the position a-a of the light uniformizing element in fig. 2, and the position a-a passes through the light source 15. It is understood that in the present embodiment, the cross-sectional views of the diffusion film 141 and the integral film layer 144 are consistent everywhere through the light source 15.

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

The light shielding layer 16 is disposed between the light guide plate 13 and the diffusion film 141, and between the diffusion film 141 and the first brightness enhancement film 142. More specifically, the light shielding layer 16 is provided between the diffusion film 141 and the light guide plate main body portion 132, and between the diffusion film 141 and the integrated film layer 144.

Therefore, light emitted from the light source 15 can be prevented from leaking to the outside in the non-display area 140, and light leakage of the backlight module can be avoided under the condition that the width of the non-display area occupied by the backlight module is reduced.

The light-shielding layer 16 is a black ink layer formed by a screen printing process. The light shielding layer 16 located between the light guide plate 13 and the diffusion film 141 may be formed on the surface of the diffusion film 141 close to the light guide plate 13, or may be formed on the surface of the light guide plate 13 close to the diffusion film 141. The light-shielding layer 16 located between the diffusion film 141 and the integrated film layer 144 may be formed on the surface of the diffusion film 141 close to the integrated film layer 144, or may be formed on the surface of the integrated film layer 144 close to the diffusion film 141. In other embodiments, the light shielding layer 16 may be formed by spraying. It should be understood that the light shielding layer 16 may also be formed by other processes, which is not limited in this embodiment.

Further, the light shielding layer 16 may be provided as a black ink layer having an adhesive. The diffusion film 141 can be further fixed to the light guide plate 13 by fixing the diffusion film 141 to one surface of the light shielding layer 16 located between the light guide plate 13 and the diffusion film 141 and fixing the light guide plate 13 to the other surface. The light-shielding layer 16 located between the diffusion film 141 and the integrated film layer 144 has one surface to which the diffusion film 141 is bonded and fixed and the other surface to which the integrated film layer 144 is bonded and fixed, whereby the integrated film layer 144 can be further fixed to the diffusion film 141.

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 electrically connected to the light source 15 to transmit a control signal provided from the outside to the light source 15. Further, the FPC board 17 is disposed at an interval from the light unifying element 14 with a gap a therebetween. The gap a is used for matching assembly errors on one hand, and on the other hand, the backlight module can still be normally used under the condition of certain cold and hot deformation.

The FPC fixing tape 18 is disposed between the FPC circuit board 17 and the light guide plate 13 to fix the FPC circuit board 17 on the light guide plate 13. Specifically, the FPC fixing tape 18 is a tape having an adhesive on both surfaces, and one surface thereof is adhered and fixed to the FPC board 17, and the other surface thereof is adhered and fixed to the light guide plate 13. In this embodiment, the FPC fixing tape 18 may be disposed at an interval from the light uniformizing element 14 to form a part of the gap a.

Further, the backlight module further includes a light-shielding tape 19 disposed on the FPC board 17 and disposed on the integrated film layer 144 at a position of the non-display area 140.

The light shielding tape 19 may include a first light shielding portion 191 and a second light shielding portion 192. The first shading portion 191 covers the FPC board 17, and the second shading portion 192 covers the integrated film layer 144. And more particularly to the integral film layer 144. The thickness of the first light shielding portion 191 may be greater than that of the second light shielding portion 192. The second light-shielding portion 192 shields the portion of the integrated film layer 144 located in the non-display area 140, and applies a suitable force to the integrated film layer 144, so that the diffusion film 141 and the integrated film layer 144 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 bright enhancement film 143, and further fixes the integrated film layer 144 by adhesion.

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 board 17 on the side (the left side in the drawing) of the light-shielding tape 19 and the FPC board 17 away from the integrated film layer 144.

The middle frame 21 is located in the accommodating cavity of the back frame 11, is disposed on a side of the light source 15 away from the light incident surface 133, and is used for supporting the FPC 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 may be made of metal, such as iron or aluminum, or plastic. The middle frame 21 may be integrally formed with the outer frame 22.

Referring to fig. 3, fig. 3 is a schematic view illustrating a light shielding principle of a light shielding layer of a backlight module according to a first embodiment of the present application.

As shown in fig. 3, the light ray S1 is originally a light ray directly emitted from the light source 15 through the gap a to cause light leakage in the non-display region 140, and the light shielding layer 16 can block the light ray and prevent the light ray from directly emitting out of the backlight module, thereby preventing the light ray from directly entering human eyes. The light shielding layer 16 does not occupy a separate width space in the width direction, and thus, the thickness of the non-display area of the backlight module can be reduced. Here, the non-display area is an area covered with the light-shielding tape 19, and the display area is an area not covered with the light-shielding tape 19.

In this embodiment, the first brightness enhancement film 142 and the second brightness enhancement film 143 are an integrated film layer 144, and the integrated film layer 144 and the diffusion film 141 are independent films, i.e. a two-layer composite film structure. In other embodiments, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 can also be provided as other composite films, for example, the first brightness enhancement film 142 and the second brightness enhancement film 143 are an integrated film layer. Alternatively, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are independent films.

The light-shielding layer 16 may be provided at other positions, for example, at any one or more of the following positions: the side surface of the light uniformizing element 14 close to the FPC board 17, between the integrated film layer 144 and the light shielding tape 19.

Referring to fig. 4-6, fig. 4 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present disclosure, the cross-sectional view being taken along the direction C-C of the diffusion film and the integrated film layer shown in fig. 6, and fig. 5 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present disclosure, the cross-sectional view being taken along the direction B-B of the diffusion film and the integrated film layer shown in fig. 6. Fig. 6 is a schematic structural view of a diffusion membrane and an integral membrane layer of a second embodiment of the present application.

First, as shown in fig. 4, in the present embodiment, the backlight module still includes a back frame 41, a reflective sheet 42, a light guide plate 43, a light uniformizing element 44, a light source 45, a light shielding layer 46, an FPC circuit board 47, 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 reflective sheet 42, the light guide plate 43, the light source 45, the light shielding layer 46, the FPC board 47, the light shielding tape 49, the middle frame 51, and the outer frame 52 are respectively the same as those of the back frame 11, the reflective sheet 12, the light guide plate 13, the light source 15, the light shielding layer 16, the FPC board 17, the light shielding tape 19, the middle frame 21, and the outer frame 22, which will not be described herein again.

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

The FPC fixing tape 48 may further have a black light-shielding material or a black light-shielding material provided on the upper surface or the lower surface or both of the upper surface and the lower surface to shield light, in addition to providing an adhesive agent on the upper surface and the lower surface to fix the FPC board 47 to the light guide plate 43.

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

The light uniformizing element 44 of the present embodiment includes a diffusion film 441 and an integral film 444 sequentially disposed on the light exiting surface of the light guide plate 43. The integrated film layer 444 is an integrated combination of the two brightness enhancement films, as described above, and is not described herein again.

The light-shielding layer 46 is provided between the diffusion film 441 and the light guide plate 43 and between the diffusion film 441 and the integrated film layer 444.

Please refer to FIG. 6. The diffusion film 441 includes a diffusion main body 4411 and a diffusion extension portion 4412 extending from the diffusion main body 4411 in the direction of the FPC fixing tape 48. The diffusion body 4411 is attached to the FPC fixing tape 48 at its side as shown in fig. 5. The diffusion extension 4412 is provided on the FPC fixing tape 48 as shown in fig. 4.

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

The light shielding layer 46 is disposed between the diffusion body 4411 and the light guide plate 43, as shown in fig. 4 and 5. It should be understood that the light shielding layer 46 may be further disposed between the diffusion extension part 4412 and the FPC fixing tape 48 at both sides of the diffusion film 441, i.e., at the position of the diffusion extension part 4412, as shown in fig. 4.

The integrated film layer 444 includes a light enhancement main body 4441 disposed on the diffusion main body 4411 and a light enhancement extending portion 4442 extending from the light enhancement main body 4441 toward the FPC fixing tape 48, the light enhancement extending portion 4442 being disposed on the diffusion extending portion 4412.

Similarly, the light enhancement extension 4442 may also comprise two light enhancement extensions, one on each side of the integral film 444. In the present embodiment, the position and shape size of the light intensifying extension 4442 may be the same as those of the diffusion extension 4412. It should be understood that in other embodiments, the number of light enhancement extensions 4442 may be other, such as one or three, etc. The shapes and sizes of the light enhancement extension 4442 may be other shapes and sizes, and are not described in detail herein.

The light shielding layer 46 is further provided between the diffusion main body 4411 and the light intensifying main body 4441, as shown in fig. 4 and 5. It should be understood that the light shielding layer 46 may be further disposed between the light enhancement extension 4442 and the diffusion extension 4412 at two sides of the integrated film 444, i.e. at the position of the light enhancement extension 4442, as shown in fig. 4.

As described above, the FPC fixing tape 48 of the present embodiment can block the light emitted from the light source 45 from being directly incident on the gap b, thereby preventing the light from leaking out of the gap b. In addition, the light shielding tape 46 may prevent leakage of light at other positions of the non-display region 440.

It should be understood that the integrated film layer 444 of the present embodiment may also be a structure without a composite film, i.e. the first brightness enhancement film and the second brightness enhancement film are independent, or the diffusion film 441 and the integrated film layer 444 may also be a composite structure, as described above, and will not be described herein again.

Similarly, the light-shielding layer 46 of the present embodiment can also be disposed at other positions, as described above, and will not be described herein again.

Referring to fig. 7 and 8, fig. 7 is a schematic cross-sectional structure view of a backlight module according to a third embodiment of the present application, the cross-sectional structure view being cut along a direction D-D of the integrated film layer shown in fig. 8.

First, as shown in fig. 7, in the present embodiment, the backlight module still includes a back frame 71, a reflective sheet 72, a light guide plate 73, a light equalizing element 74, a light source 75, a light shielding layer 76, an FPC circuit board 77, 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 reflective sheet 72, the light guide plate 73, the light source 75, the light shielding layer 76, the FPC board 77, the light shielding tape 79, the middle frame 81, and the outer frame 82 are respectively the same as those of the back frame 11, the reflective sheet 12, the light guide plate 13, the light source 15, the light shielding layer 16, the FPC board 17, the light shielding tape 19, the middle frame 21, and the outer frame 22, which will not be described herein again.

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 uniformizing element 74, and is in contact with the side surface of the diffusion film 741. Thus, the present embodiment has only the gap c between the FPC board 77 and the dodging member 74.

The FPC fixing tape 78 may be provided with a black light shielding material on the upper surface or the lower surface or both surfaces to shield light, in addition to providing an adhesive on the upper surface and the lower surface to fix the FPC board 77 to the light guide plate 73.

Specifically, the FPC fixing tape 78 may be black tape. The FPC fixing tape 78 may also be provided with a black ink layer on the upper surface or the lower surface thereof or on the upper surface and the lower surface thereof to play a role of shading light. The arrangement of the black ink layer may be the same as that described above, and will not be described herein again.

The light uniformizing element 74 of this embodiment includes a diffusion film 741 and an integral film layer 744 sequentially disposed on the light exiting surface of the light guide plate 73. The integrated film layer 744 is an integrated combination of the two brightness enhancement films, and as described above, is not described herein again.

The light-shielding layer 76 is provided between the diffusion film 741 and the light guide plate 73 and between the diffusion film 741 and the integrated film layer 744.

Please refer to FIG. 8. The integrated film layer 744 includes a light increasing body 7441 provided on the diffusion film 741 and a light increasing extension portion 7442 extending from the light increasing body 7441 toward the FPC fixing tape 48, and the light increasing extension portion 7442 is provided on the FPC fixing tape 48. The diffusion film 741 and the intensifying body 7422 may have the same shape and size.

It should be understood that fig. 7 is a schematic cross-sectional view of fig. 8 cut along the direction of the light enhancing extension 7442 of the integral film layer 744, i.e., along the direction D-D shown in fig. 8. If the cross-sectional structure of the light-enhancing body 7441 cut along the direction of the integral film 744 is the same as that of fig. 5, it will not be described again.

Specifically, the light shielding layer 76 is provided between the diffusion film 741 and the light guide plate 73 and between the diffusion film 741 and the light intensifying body 7441. It should be understood that, at two sides of the integrated film layer 744, i.e. at the position of the light enhancement extending portion 4442, the light shielding layer 76 may be further disposed between the light enhancement extending portion 7442 and the FPC fixing tape 78.

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

It should be understood that the integrated film layer 744 of this embodiment may also be a non-composite film structure, i.e. the first and second brightness enhancement films are independent, or the diffusion film 741 and the integrated film layer 744 may also be a composite structure, as described above, and will not be described herein again.

Similarly, the light-shielding layer 76 of the present embodiment may also be disposed at other positions, as described above, and will not be described herein again.

Referring to fig. 9, fig. 9 is an exploded schematic view of an electronic device according to an embodiment of the disclosure. In this embodiment, the electronic device 90 may be a smart phone, and in other embodiments, the electronic device may also be a tablet computer, a palm computer, a smart watch, and the like.

In the present 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 connected 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 fixed to the middle frame 92.

The backlight module 93 is used for providing backlight for the display module 94.

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

The cover plate 95 covers the display module 94. The cover 95 may be a transparent glass cover, and in the non-display area, the cover 95 may be opaque. For example, the cover plate 95 is coated with a light-shielding ink in the non-display area.

It is to be understood that other structures of the electronic device, such as a circuit board, etc., may be provided between the rear case 91 and the middle frame 92, and will not be specifically described herein since the present application is not directed to improvements of these components.

In other embodiments, the electronic device 90 may have other structures, and the description of the structure of the electronic device 90 is not intended to limit the scope of the present application.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A backlight module is characterized in that the backlight module comprises:

the light guide plate comprises a light incident surface and a light emergent surface;

the light source is arranged on one side of the light incident surface;

the light homogenizing element comprises a diffusion film, a first light enhancement film and a second light enhancement film which are sequentially arranged on the light emitting surface, the first light enhancement film and the second light enhancement film are integrated film layers, the integrated film layers and the diffusion film are mutually independent film layers, and one end, close to the light incident surface, of the light homogenizing element is located in a non-display area;

a light shielding layer disposed in the non-display region, between the light guide plate and the diffusion film, and between the diffusion film and the first brightness enhancement film; the shading layer is a black ink layer formed through a screen printing process.

2. The backlight module according to claim 1, further comprising an FPC circuit board disposed on and electrically connected to the light source and an FPC fixing tape disposed between the FPC circuit board and the light guide plate to fix the FPC circuit board on the light guide plate.

3. The backlight module as claimed in claim 2, wherein the diffusion film comprises a diffusion main body disposed on the light-emitting surface and a diffusion extension portion extending from the diffusion main body toward the FPC fixing tape, the diffusion extension portion being disposed on the FPC fixing tape;

the integrated film layer comprises a light increasing main body arranged on the diffusion main body and a light increasing extending portion extending from the light increasing main body to the FPC fixing adhesive tape, and the light increasing extending portion is arranged on the diffusion extending portion.

4. The backlight module as claimed in claim 3, wherein the light shielding layer is disposed between the diffusion body and the light guide plate and between the diffusion body and the light intensifying body.

5. The backlight module according to claim 3, wherein there are two diffusion extensions and two light-enhancing extensions, the two diffusion extensions are disposed on two sides of the diffusion film, and the two light-enhancing extensions are disposed on two sides of the integrated film.

6. The backlight module as claimed in claim 2, wherein the integrated film layer comprises a light-enhancing main body disposed on the diffusion film and a light-enhancing extending portion extending from the light-enhancing main body to the FPC fixing tape, the light-enhancing extending portion being disposed on the FPC fixing tape;

the light shielding layer is arranged between the diffusion film and the light guide plate and between the light intensifying main body and the diffusion film.

7. The backlight module according to claim 1, further comprising a light blocking tape disposed on the integral film layer for fixing the integral film layer.

8. An electronic device, characterized in that the electronic device comprises a backlight module according to any one of claims 1-7.