CN220252342U

CN220252342U - Backlight module and display device

Info

Publication number: CN220252342U
Application number: CN202321099836.2U
Authority: CN
Inventors: 章小和; 胡湘; 李达明; 代仕星
Original assignee: Xinli Photoelectric Renshou Co Ltd
Current assignee: Xinli Photoelectric Renshou Co Ltd
Priority date: 2023-05-09
Filing date: 2023-05-09
Publication date: 2023-12-26
Anticipated expiration: 2033-05-09

Abstract

The utility model discloses a backlight module and a display device, which relate to the field of display modules, wherein the backlight module comprises an upper brightness enhancement film, a lower brightness enhancement film and a lower diffusion film which are sequentially arranged from top to bottom, one end of the lower brightness enhancement film, which is close to a light source, is provided with a bulge, a bulge area of the lower brightness enhancement film and the upper brightness enhancement film, which is positioned on the lower brightness enhancement film, is respectively provided with a first gap and a second gap, and a single-sided adhesive is arranged on the bulge area; the utility model fills the problem that the thickness of the raised area is thinner than that of other positions due to the arrangement of the gaps by using the thickness of the single-sided adhesive, so that the supporting thickness of the shading adhesive is consistent, and the shading adhesive of the raised area is completely stressed and activated when the backlight module is adhered and assembled with the display panel, so that the shading adhesive is stressed the same as the display panel, the purpose of tightly adhering the shading adhesive to the display panel is achieved, the service life of the product is prolonged, the manufacturing cost is low, and the product competitiveness is improved.

Description

Backlight module and display device

Technical Field

The utility model relates to the technical field of display modules, in particular to a backlight module and a display device.

Background

Consumers have higher and higher requirements on display effects of mobile phone display screens, and backlight is used as a light source component of the mobile phone display screens, so that the light emitting effect of the backlight directly influences the display effects of the display screens. When the backlight module adopts narrow-side design, the frame of the plastic frame is also narrowed, the film material cannot be effectively fixed, in order to better fix the lower brightness enhancement film in the backlight module and prevent displacement in the transportation or vibration process, so that abnormal display is caused, a protruding structure is usually designed at the corners of the two sides of the bottom of the lower brightness enhancement film, as disclosed in patent application number 201220500808.2, the lower brightness enhancement film, the backlight module and the liquid crystal display device, wherein at least one protruding block extends from the bottom edge close to one end of a light source of the lower brightness enhancement film, and the protruding block extends to the upper part of the flexible circuit board and is adhered with the shading adhesive above the protruding block; a first notch is arranged on the lower diffusion film in a region corresponding to the lower brightness enhancement film bump; the lower brightness enhancement film convex block is positioned in the first notch, and the double faced adhesive tape is positioned below the flexible circuit board; a second notch is arranged in a region corresponding to the lower brightness enhancement film bump on the flexible circuit board; the lower brightness enhancement film protruding block penetrates through the first notch and the second notch and the double-sided adhesive tape, and the protruding block is arranged at one end, close to the light source, of the lower brightness enhancement film in an extending mode in the technical scheme, and the protruding block, the double-sided adhesive tape and the shading adhesive tape can effectively prevent the film material from shifting, so that the film material is fixed, and the problem that the film material in the backlight module cannot be effectively fixed is solved.

However, when the present inventors embodied this structure, the following drawbacks were found to exist: the bump part of the lower diffusion film is adhered to the double-sided adhesive on the backlight FPC in an overlapping manner, the bump part is adhered and fixed with the shading adhesive, the upper brightness enhancement film and the diffusion film are provided with gaps for avoiding the bump part, the thickness of the avoiding area is stacked to be thinner than that of other positions, and when the backlight module is assembled with the liquid crystal display, the shading adhesive at the overlapping position of the avoiding area and the liquid crystal display cannot be completely stressed and activated, so that the backlight module is easy to separate.

Disclosure of Invention

Based on the above technical problems, it is necessary to provide a backlight module and a display device, in which, a first notch and a second notch are respectively disposed in a raised area of a lower diffusion film and an upper brightness enhancement film, a protrusion is disposed on the lower brightness enhancement film, the protrusion can adhere to a double-sided adhesive and a shading adhesive through the first notch and the second notch, thereby fixing the lower brightness enhancement film, avoiding displacement of film materials in transportation or oscillation process, ensuring normal display, setting single-sided adhesive in the raised area on the backlight module, filling the raised area thinner than other positions due to the provision of the notch by using the thickness of the single-sided adhesive, so that the supporting thickness of the shading adhesive is consistent, when the backlight module is adhered and assembled with a display panel, the shading adhesive is completely stressed and activated, thus the shading adhesive is the same as the display panel, the purpose of tightly adhering the display panel, the service life of the product is improved, and the whole structure only adds the single-sided adhesive, thus the problem of separating the backlight module from the display panel is solved, the manufacturing cost is low, and the product competitiveness is improved.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a backlight unit, its includes upper brightness enhancement film, lower brightness enhancement film and the lower diffusion membrane that from the top down set gradually, the one end that the brightness enhancement film is close to the light source down is provided with the arch, lower diffusion film and upper brightness enhancement film are located the protruding region of brightness enhancement film down and are equipped with first breach and second breach respectively protruding region is provided with the single face and glues.

As a preferred embodiment of the backlight module provided by the utility model, the protrusions are arranged at two ends of the lower brightness enhancement film.

As a preferred implementation mode of the backlight module, the utility model further comprises a shading adhesive, a double-sided adhesive and a backlight FPC, wherein the upper surface and the lower surface of the bulge are respectively adhered with the shading adhesive and the double-sided adhesive through the notch.

In a preferred embodiment of the backlight module provided by the utility model, the double-sided adhesive tape is provided with a protruding portion extending to the protruding area, and the area of the backlight FPC located in the protruding portion is provided with a third notch.

In a preferred embodiment of the backlight module provided by the utility model, the single-sided adhesive is arranged at the lower side of the raised area, the single-sided adhesive surface is adhered to the raised area, and the single-sided adhesive non-adhesive surface is adhered to the raised area.

In a preferred embodiment of the backlight module provided by the utility model, the single-sided adhesive is arranged on the upper side of the raised area, the single-sided adhesive surface is adhered to the raised area, and the single-sided adhesive non-adhesive surface is adhered to the shading adhesive.

As a preferred embodiment of the backlight module provided by the utility model, the light-shielding glue may be replaced by light-shielding paper.

As a preferred embodiment of the backlight module provided by the utility model, the sum of the thicknesses of the double-sided adhesive and the single-sided adhesive is consistent with the sum of the thicknesses of the upper brightness enhancement film and the lower brightness enhancement film.

As a preferred implementation mode of the backlight module provided by the utility model, the inner side corner of the first notch is an arc-shaped opening, and the protruding part and the single-sided adhesive are matched with the first notch.

The utility model also provides a display device which comprises a display panel and the backlight module.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the backlight module provided by the utility model, the first notch and the second notch are respectively arranged in the raised area of the lower brightness enhancement film, the protrusions are arranged on the lower brightness enhancement film and can be adhered to the double-sided adhesive and the shading adhesive through the first notch and the second notch, so that the lower brightness enhancement film is fixed, the displacement of the film material in the transportation or oscillation process is avoided, the normal display is ensured, the single-sided adhesive is arranged in the raised area on the backlight module, the problem that the raised area is thinner than other positions due to the arrangement of the notch is filled by utilizing the thickness of the single-sided adhesive, the supporting thickness of the shading adhesive is consistent, the shading adhesive in the raised area is completely stressed and activated when the backlight module is adhered and assembled with the display panel, the stress of the shading adhesive is the same as that of the display panel, the purpose of tightly adhering the shading adhesive to the display panel is achieved, the service life of a product is prolonged, the problem that the backlight module is separated from the display panel can be solved by only adding the single-sided adhesive in the integral structure, the manufacturing cost is low, and the product competitiveness is improved.

2. According to the backlight module provided by the utility model, the protruding part is arranged on the double-sided adhesive, the protruding part extends to the protruding area, the protruding part is convenient to adhere to the double-sided adhesive, the arc-shaped opening is arranged on the inner side of the first notch, when the single-sided adhesive is adhered, the single-sided adhesive is convenient to position and install, the adhesion accuracy and the working efficiency of the single-sided adhesive are improved, the sum of the thicknesses of the double-sided adhesive and the single-sided adhesive is consistent with the sum of the thicknesses of the upper brightness enhancement film and the lower brightness enhancement film, and after all film materials are adhered, the light shielding adhesive is further ensured to be fully stressed and activated, and the adhesion strength is ensured.

3. According to the display device provided by the utility model, the bulge is arranged on one side of the lower brightness enhancement film in the backlight module, the bulge area is provided with the single-sided adhesive, the single-sided adhesive is used for filling the thickness, so that the stress of the shading adhesive is ensured to be uniform, the backlight module and the display panel can be tightly attached when the backlight module and the display panel are attached, the separation of the backlight module and the display panel is avoided, and the service life of a product is prolonged.

Drawings

In order to more clearly illustrate the solution of the present utility model, a brief description will be given below of the drawings required for the description of the embodiments, it being obvious that the drawings in the following description are some embodiments of the present utility model, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic plan view of a backlight module according to the present utility model;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

fig. 3 is a schematic perspective exploded view of the overall structure of the backlight module according to the present utility model;

FIG. 4 is a schematic diagram of an upper brightness enhancement film of a backlight module according to the present utility model;

FIG. 5 is a schematic diagram of a lower brightness enhancement film of a backlight module according to the present utility model;

FIG. 6 is a schematic diagram of a bottom diffusion film of a backlight module according to the present utility model;

fig. 7 is a schematic diagram of a backlight FPC of the backlight module according to the present utility model;

fig. 8 is a schematic diagram of a double-sided adhesive structure of a backlight module according to the present utility model;

FIG. 9 is a schematic diagram of a portion of a stacked structure of a backlight module according to the present utility model;

fig. 10 is a schematic diagram of a partial stacked structure of the backlight module according to the present utility model.

The labels in the figures are illustrated below:

1. a polishing film is arranged on the upper surface of the substrate; 11. a second notch; 2. a lower brightness enhancement film; 21. a protrusion; 3. a lower diffusion film; 31. a first notch; 32. an arc-shaped opening; 4. single-sided sticking; 5. a light guide plate; 6. a reflective film; 7. an outer frame; 8. backlight FPC; 81. a third notch; 9. double-sided adhesive; 91. a protruding portion; 10. and (5) shading glue.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

As described in the background art, the bump portion of the lower diffusion film is adhered to the double-sided adhesive on the backlight FPC in an overlapping manner, and the upper light enhancement film and the diffusion film are adhered to and fixed to the light shielding adhesive, so that the bump portion is provided with a notch to avoid, the thickness of the avoiding area is stacked to be thinner than that of other positions, and when the backlight module is assembled with the liquid crystal display, the light shielding adhesive at the overlapping position of the avoiding area and the liquid crystal display cannot be completely activated by force, and is easy to separate.

In order to solve the technical problem, the utility model provides a backlight module which is applied to the field of backlight modules.

Specifically, referring to fig. 1-5, the backlight module specifically includes an upper brightness enhancement film 1, a lower brightness enhancement film 2, and a lower diffusion film 3 sequentially disposed from top to bottom, a protrusion 21 is disposed at one end of the lower brightness enhancement film 2 near the light source, a first notch 31 and a second notch 11 are disposed in a protrusion 21 area of the lower brightness enhancement film 2 of the lower diffusion film 3 and the upper brightness enhancement film 1, and a single-sided adhesive 4 is disposed in the protrusion 21 area.

According to the backlight module provided by the utility model, the first notch 31 and the second notch 11 are respectively arranged in the raised 21 area of the lower diffusion film 3 and the upper brightness enhancement film 1 positioned on the lower brightness enhancement film 2, the raised 21 is arranged on the lower brightness enhancement film 2, the raised 21 can be adhered to the double-sided adhesive 9 and the shading adhesive 10 through the first notch 31 and the second notch 11, so that the lower brightness enhancement film 2 is fixed, the displacement of film materials in the transportation or oscillation process is avoided, the normal display is ensured, the single-sided adhesive 4 is arranged in the raised 21 area of the backlight module, the problem that the raised 21 area is thinner than other positions due to the arrangement of the notch is solved by utilizing the thickness of the single-sided adhesive 4, the supporting thickness of the shading adhesive 10 is consistent, the shading adhesive 10 in the raised 21 area is completely stressed and activated when the backlight module is adhered and assembled with the display panel, the purpose that the shading adhesive 10 is tightly adhered to the display panel is achieved, the service life of a product is prolonged, the whole structure is only added with the single-sided adhesive 4, the problem that the backlight module is separated from the display panel is solved, the cost is low, and the competitive cost is improved.

In order to solve the technical problem, the utility model also provides a display device which is applied to the technical field of display modules.

Specifically, referring to fig. 3, the display device includes a display panel and the backlight module described above.

According to the display device provided by the utility model, the bulge 21 is arranged on one side of the lower light enhancement film 2 in the backlight module, the single-sided adhesive 4 is arranged in the bulge 21 area, the single-sided adhesive 4 is used for filling the thickness, the uniform stress of the shading adhesive 10 is ensured, the backlight module and the display panel can be tightly attached when the backlight module and the display panel are attached, the separation of the backlight module and the display panel is avoided, and the service life of a product is prolonged.

In order to make the person skilled in the art better understand the solution of the present utility model, the technical solution of the embodiment of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

It should be noted that, under the condition of no conflict, the embodiments of the present utility model and the features and technical solutions in the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Example 1

Referring to fig. 1-10, a backlight module is provided, which includes an upper brightness enhancement film 1, a lower brightness enhancement film 2 and a lower diffusion film 3 sequentially disposed from top to bottom, wherein a protrusion 21 is disposed at one end of the lower brightness enhancement film 2 near a light source, the protrusion 21 is disposed at two ends of the lower brightness enhancement film 2, in a specific implementation, a first notch 31 and a second notch 11 are disposed at the protrusion 21 area of the lower brightness enhancement film 2 of the lower diffusion film 3 and the upper brightness enhancement film 1 respectively, a single-sided adhesive 4 is disposed at the protrusion 21 area, a light guide plate 5 and a reflective film 6 are sequentially disposed at the lower side of the diffusion film, the upper brightness enhancement film 1, the lower brightness enhancement film 2, the lower diffusion film 3, the light guide plate 5 and the reflective film 6 are disposed in an outer frame 7, a backlight FPC8 is disposed at one side near the light source, the backlight FPC8 is fixed on the outer frame 7 through a double-sided adhesive 9, the backlight FPC8 is connected to an IC module on the module and is fixed on the lower surface of the lower brightness enhancement film 2 through the double-sided adhesive 9, and the light shielding film 10 is adhered to the upper surface of the light shielding frame 10 through the double-sided adhesive 9 respectively.

When the shading material is selected, the shading adhesive 10 can be replaced by shading paper, the purpose of shading the frame is achieved by utilizing the shading paper, and meanwhile, the bottom surface of the shading paper is set to be an adhesive surface, so that the shading paper is convenient to adhere to the single-sided adhesive 4 or the bulges 21.

When the light-shielding adhesive 10 is applied to a display device, the light-shielding adhesive 10 of the backlight module is adhered to a display panel, and a picture is displayed by the display panel.

When the backlight module and the backlight module are applied to a display device, the first notch 31 and the second notch 11 are respectively arranged in the raised 21 area of the lower diffusion film 3 and the upper brightness enhancement film 1, the raised 21 is arranged on the lower brightness enhancement film 2, the raised 21 can be adhered to the double-sided adhesive 9 and the shading adhesive 10 through the first notch 31 and the second notch 11, so that the lower brightness enhancement film 2 is fixed, the displacement of film materials in the transportation or oscillation process is avoided, the normal display is ensured, the single-sided adhesive 4 is arranged in the raised 21 area on the backlight module, the problem that the raised 21 area is thinner than other positions due to the arrangement of the notch is solved by utilizing the thickness of the single-sided adhesive 4, the supporting thickness of the shading adhesive 10 is consistent, the shading adhesive 10 in the raised 21 area is completely stressed and activated when the backlight module and the display panel are adhered and assembled, the purpose that the shading adhesive 10 is tightly adhered to the display panel is achieved, the service life of a product is prolonged, the whole structure is only added with the single-sided adhesive 4, the problem that the backlight module and the display panel are separated from each other is solved, and the cost is low.

Example 2

As shown in fig. 4-8, in particular, the double-sided adhesive tape 9 is provided with a protrusion 91 extending to the area of the protrusion 21, the area of the backlight FPC8 located at the protrusion 91 is provided with a third notch 81, the third notch 81 extends to the junction of the protrusion 21 and the lower brightness enhancement film 2, the sum of the thicknesses of the double-sided adhesive tape 9 and the single-sided adhesive tape 4 is consistent with the sum of the thicknesses of the upper brightness enhancement film 1 and the lower brightness enhancement film 2, the inner corner of the first notch 31 is an arc-shaped opening 32, and the protrusion 91 and the single-sided adhesive tape 4 are matched with the first notch 31.

Through the above-mentioned structural design, set up bulge 91 on two-sided adhesive 9, bulge 91 extends to protruding 21 region, be convenient for protruding 21 and two-sided adhesive 9 bond to set up arc mouth 32 in first breach 31 inboard, when bonding single face is glued 4, make things convenient for single face to glue 4 location installation, improved single face and glued 4's bonding accuracy and work efficiency, and the sum of the thickness that two-sided adhesive 9 and single face glued 4 is unanimous with the sum of the thickness of last brightness enhancement film 1 and lower brightness enhancement film 2, after all film materials bond finishes, further ensured that shading adhesive 10 can the complete atress activation, ensured the bonding dynamics.

Example 3

Further optimizing the backlight module provided in embodiment 2, specifically, the position setting of the single-sided adhesive 4 may be selected from a plurality of positions, in this case, the single-sided adhesive 4 is set on the upper side or the lower side of the area of the protrusion 21, as shown in fig. 10, when the single-sided adhesive 4 is set on the lower side of the area of the protrusion 21, the adhesive surface of the single-sided adhesive 4 is adhered to the protrusion 21, and the non-adhesive surface of the single-sided adhesive 4 is adhered to the protrusion 91 of the double-sided adhesive 9; as shown in fig. 9, when the single-sided adhesive 4 is disposed on the upper side of the area of the protrusion 21, the adhesive surface of the single-sided adhesive 4 is adhered to the protrusion 21, and the non-adhesive surface of the single-sided adhesive 4 is adhered to the light shielding adhesive 10.

The single-sided adhesive 4 is made of PET (polyethylene terephthalate) film, an adhesive layer is arranged on one side of the PET film, and release paper is arranged on one side of the adhesive layer, so that the single-sided adhesive 4 is formed, and when the single-sided adhesive 4 is used, the release paper is torn, and the single-sided adhesive 4 is sequentially adhered and fixed according to the arrangement of the single-sided adhesive 4.

Through the structural design, the single-sided adhesive 4 is flexible in setting position, and the position of the single-sided adhesive 4 can be freely set according to production requirements, and only the stacked thin area of the raised 21 area can be filled with the single-sided adhesive 4.

The utility model provides a working principle of a backlight module: during production, the upper brightness enhancement film 1, the lower brightness enhancement film 2, the lower diffusion film 3, the backlight FPC8 and the double-sided adhesive 9 are prepared according to the structure in the embodiment, then, the upper brightness enhancement film 1, the lower brightness enhancement film 2, the lower diffusion film 3, the light guide plate 5, the reflecting film 6 and the backlight FPC8 in the backlight module are assembled in an adhesion manner according to the conventional assembly process of the backlight module, the single-sided adhesive 4 is adhered to the bulge 21 area of the lower brightness enhancement film 2 according to the production requirement and the production requirement, the bulge 21 is adhered to the double-sided adhesive 9 and the light-shielding adhesive 10 through the first notch 31 and the second notch 11, so that the lower brightness enhancement film 2 is fixed, the film material is prevented from displacing in the transportation or oscillation process, the normal display is ensured, the bulge 21 area on the backlight module is provided with the single-sided adhesive 4, the problem that the bulge 21 area is thinner than other positions due to the arrangement of the notch is solved, the supporting thickness of the light-shielding adhesive 10 is consistent, the bulge 21 can be completely adhered to the display panel when the backlight module is adhered to the display panel, the whole display panel is adhered to the display panel, the stress is completely and the bulge 10 is completely activated, the stress of the same, the whole display panel is completely is adhered to the display panel is completely, the stress-separated, and the stress of the display panel is completely is improved, and the stress-shielding adhesive 10 is only is manufactured, and the stress the whole display panel is completely, and the stress-sealed, and the stress is the stress-shielding panel is completely is the display panel is and the stress-sealed.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It is apparent that the above-described embodiments are only some embodiments of the present utility model, but not all embodiments, and the preferred embodiments of the present utility model are shown in the drawings, which do not limit the scope of the patent claims. This utility model may be embodied in many different forms, but rather, embodiments are provided in order to provide a thorough and complete understanding of the present disclosure. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing description, or equivalents may be substituted for elements thereof. All equivalent structures made by the content of the specification and the drawings of the utility model are directly or indirectly applied to other related technical fields, and are also within the scope of the utility model.

Claims

1. The utility model provides a backlight unit, its includes last brightness enhancement film (1), lower brightness enhancement film (2) and lower diffusion membrane (3) that from the top down set gradually, the one end that is close to the light source of lower brightness enhancement film (2) is provided with arch (21), its characterized in that, the protruding (21) region that lower diffusion membrane (3) and last brightness enhancement film (1) are located lower brightness enhancement film (2) is equipped with first breach (31) and second breach (11) respectively protruding (21) region is provided with single face and glues (4).

2. A backlight module according to claim 1, wherein the protrusions (21) are provided at both ends of the lower brightness enhancement film (2).

3. A backlight module according to claim 1, further comprising a light shielding adhesive (10), a double-sided adhesive (9) and a backlight FPC (8), wherein the upper and lower surfaces of the protrusions (21) are respectively adhered to the light shielding adhesive (10) and the double-sided adhesive (9) through the notches.

4. A backlight module according to claim 3, wherein the sum of the thicknesses of the double-sided adhesive (9) and the single-sided adhesive (4) corresponds to the sum of the thicknesses of the upper and lower brightness enhancement films (1, 2).

5. A backlight module according to claim 3, wherein the double-sided adhesive tape (9) is provided with a protrusion (91) extending to the area of the protrusion (21), and the area of the backlight FPC (8) located at the protrusion (91) is provided with a third notch (81).

6. A backlight module according to claim 5, wherein the single-sided adhesive (4) is disposed below the area of the protrusion (21), the adhesive surface of the single-sided adhesive (4) is adhered to the protrusion (21), and the non-adhesive surface of the single-sided adhesive (4) is adhered to the protrusion (91) of the double-sided adhesive (9).

7. A backlight module according to claim 5, wherein the single-sided adhesive (4) is disposed on an upper side of the area of the protrusion (21), the adhesive surface of the single-sided adhesive (4) is adhered to the protrusion (21), and the non-adhesive surface of the single-sided adhesive (4) is adhered to the light shielding adhesive (10).

8. A backlight module according to claim 5, wherein the inner corner of the first notch (31) is an arc-shaped opening (32), and the protruding portion (91) and the single-sided adhesive (4) are matched with the first notch (31).

9. A backlight module according to claim 3, wherein the light-shielding glue (10) is replaced by light-shielding paper.

10. A display device comprising a display panel and a backlight module according to any one of claims 1-9.