CN216595823U

CN216595823U - Backlight source, backlight module and display device

Info

Publication number: CN216595823U
Application number: CN202122885638.6U
Authority: CN
Inventors: 邹献宾; 黎旭; 沈峻
Original assignee: Guangxi Century Innovation Display Electronics Co Ltd
Current assignee: Guangxi Century Innovation Display Electronics Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-05-24
Anticipated expiration: 2031-11-23

Abstract

The application belongs to the technical field of display, and particularly relates to a backlight source, a backlight module and a display device, wherein the backlight source comprises a back plate, a reflecting sheet, a light guide plate, a diaphragm and two light-emitting strips, the back plate is provided with an installation cavity, the reflecting sheet, the light guide plate and the diaphragm are sequentially stacked in the installation cavity, and the two light-emitting strips are respectively installed on two opposite side walls of the installation cavity; the other opposite two side walls of the installation cavity are provided with positioning blocks, first positioning notches are formed in the positioning blocks, first positioning protrusions are arranged on the two opposite side edges of the light guide plate, and the first positioning protrusions are respectively clamped in the first positioning notches. The first locating bulge of light guide plate is in the first locating breach of joint on the locating piece respectively for the light guide plate is the same to the distance of two luminous strips, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (like under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency.

Description

Backlight source, backlight module and display device

Technical Field

The application belongs to the technical field of display, and particularly relates to a backlight source, a backlight module and a display device.

Background

The backlight module is one of the key components of the liquid crystal display device, and comprises a middle frame, a backlight source and a liquid crystal panel, wherein the backlight source and the liquid crystal panel are arranged in the middle frame; at present, backlight sources in a backlight module are divided into single-side light incidence and double-side light incidence, but the brightness of the single-side light incidence is not High, so that the requirement of High-brightness products cannot be met, and particularly, a High-Dynamic Range (HDR) mode needs higher brightness; while the brightness can be improved by the common double-side light incidence, the problem of insufficient uniformity exists.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a backlight, backlight unit and display device, aim at solving the technical problem that luminance and degree of consistency can not be compromise simultaneously to the backlight among the prior art.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: a backlight source comprises a back plate, a reflecting plate, a light guide plate, a diaphragm and two light-emitting strips, wherein the back plate is provided with an installation cavity, the reflecting plate, the light guide plate and the diaphragm are sequentially arranged in the installation cavity in a laminated mode, and the two light-emitting strips are respectively installed on two opposite side walls of the installation cavity; the other opposite two side walls of the installation cavity are provided with positioning blocks, the positioning blocks are provided with first positioning notches, the opposite two side edges of the light guide plate are provided with first positioning protrusions, and the first positioning protrusions are respectively clamped in the first positioning notches.

Optionally, the locating piece is including connecting portion and the fixed part that is connected, the fixed part is fixed in on the cavity bottom surface of installation cavity, connecting portion laminate in on the lateral wall of installation cavity, first location breach set up in connecting portion dorsad on the terminal surface of fixed part.

Optionally, an accommodating notch is formed in a position, corresponding to the positioning block, of the side wall of the mounting cavity, and a separation protrusion is arranged on the connecting block, facing the side wall of the mounting cavity, and the separation protrusion is U-shaped, extends along the edge of the first positioning notch, and extends into the accommodating notch;

the separating protrusion is surrounded to form a second positioning notch, the second positioning notch is communicated with the first positioning notch, and the first positioning protrusion is clamped into the first positioning notch and the second positioning notch.

Optionally, the accommodating notch penetrates through a side wall of the mounting cavity.

Optionally, the side face of the connecting portion, which is close to the light guide plate, is provided with an abutting protrusion, the abutting protrusion is located on the side of the first positioning notch, and the abutting protrusion abuts against the side edge of the light guide plate.

Optionally, the two opposite side edges of the diaphragm are also provided with second positioning protrusions, and the second positioning protrusions are clamped into the first positioning notches.

Optionally, the back plate is an aluminum back plate.

Optionally, the light-emitting strip is attached to the side wall of the mounting cavity through a heat-dissipating adhesive.

One or more technical solutions in the backlight provided by the present application have at least one of the following technical effects: according to the backlight source, the light emitting strips are arranged on the upper side and the lower side of the mounting cavity on the back plate, meanwhile, the left side and the right side of the back plate are both provided with the positioning blocks, the first positioning protrusions on the left side and the right side of the light guide plate are respectively clamped in the first positioning notches on the positioning blocks, the light guide plate cannot move up and down, the light guide plate can be fixed in the middle position of the two light emitting strips, so that the distances from the light guide plate to the two light emitting strips are equal, the two light emitting strips enter the light guide plate at the same incident light distance, the light distribution uniformity on the light guide plate is good, and the display uniformity is high; simultaneously, under the moisture absorption inflation and the thermal expansion situation of being met, the light guide plate is the same to the expanded distance of two light-emitting strips, it is the same to guarantee that the light guide plate is the same to the distance of two light-emitting strips, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (like under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency, make backlight unit and the display device who installs this backlight have hi-lite and high degree of consistency, let the user have better experience.

Another technical scheme adopted by the application is as follows: a backlight module comprises the backlight source.

According to the backlight module, due to the adoption of the backlight source, the distances from the light guide plate to the two light-emitting strips are equal, the two light-emitting strips enter the light guide plate at the same incident light distance, the light distribution uniformity on the light guide plate is good, and the display uniformity of the backlight module is high; simultaneously, under the moisture absorption inflation and the thermal expansion situation of being met, the light guide plate is the same to the expanded distance of two light-emitting strips, guarantees that the light guide plate is the same to the distance of two light-emitting strips, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency, make the backlight unit who installs this backlight have hi-lite and high degree of consistency, let the user have better experience.

Another technical scheme adopted by the application is as follows: a display device comprises the backlight module.

According to the display device, due to the adoption of the backlight module, the distances from the light guide plate to the two light-emitting strips are equal, the two light-emitting strips enter the light guide plate at the same incident light distance, the light distribution uniformity on the light guide plate is good, and the display uniformity of the display device is high; simultaneously, under the moisture absorption inflation and the thermal expansion situation of being met, the light guide plate is the same to the expanded distance of two light-emitting strips, guarantees that the light guide plate is the same to the distance of two light-emitting strips, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency, make and install this display device and have hi-lite and high degree of consistency, let the user have better experience.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure.

Fig. 2 is a partial cross-sectional view taken along line a-a in fig. 1.

Fig. 3 is an exploded view of the backlight module shown in fig. 1.

Fig. 4 is a schematic structural diagram of the backlight source in fig. 3.

Fig. 5 is a partially enlarged view of B in fig. 4.

Fig. 6 is an exploded view of the backlight shown in fig. 4.

Fig. 7 is a schematic structural diagram of a first view angle of the positioning block in fig. 6.

Fig. 8 is a structural diagram of the positioning block in fig. 6 from a second perspective.

Fig. 9 is a schematic structural diagram of a back plate and a light-emitting bar of the backlight source in fig. 4.

Fig. 10 is a partial enlarged view at C in fig. 9.

Fig. 11 is a partial enlarged view of fig. 9 at D.

Wherein, in the figures, the respective reference numerals:

1-backlight module 10-backlight source 11-backboard

12-reflector plate 13-light guide plate 14-diaphragm

15-luminous strip 16-positioning block 20-middle frame

21-convex rib 30-liquid crystal panel 111-installation cavity

112-accommodating notch 113-connecting hole 131-first positioning projection

141-second positioning projection 151-heat dissipation glue 161-connecting part

162-fixing part 1611-first positioning notch 1612-separating projection

1613-second positioning notch 1614-abutment projection 1621-attachment projection.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in fig. 1-11, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be considered as limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

As shown in fig. 1 to 11, in an embodiment of the present application, a backlight 10 is provided, wherein, with reference to fig. 1, fig. 2 and fig. 3, the backlight 10, a middle frame 20 and a liquid crystal panel 30 jointly form a backlight module 1, the backlight 10 is used for providing a light source for the liquid crystal panel 30, so that the liquid crystal panel 30 can normally display, and the backlight module 1 can be applied to a display device, a television, an all-in-one computer or a flat panel.

As shown in fig. 4, 5 and 6, the backlight 10 includes a back plate 11, a reflective sheet 12, a light guide plate 13, a diaphragm 14 and two light-emitting strips 15, the back plate 11 has a mounting cavity 111, the reflective sheet 12, the light guide plate 13 and the diaphragm 14 are sequentially stacked in the mounting cavity 111, and the two light-emitting strips 15 are respectively mounted on two opposite sidewalls of the mounting cavity 111; specifically, the light-emitting strips 15 are located between the light guide plate 13 and the side wall of the installation cavity 111, the two light-emitting strips 15 are respectively installed on the upper wall surface and the lower wall surface of the installation cavity 111, the two light-emitting strips 15 respectively face the upper surface and the lower surface of the light guide plate 13, light emitted by the light-emitting strips 15 enters the light guide plate 13 from the upper side and the lower side of the light guide plate 13, is refracted by the light guide plate 13, is emitted from the front side surface of the light guide plate 13, and is irradiated onto the liquid crystal panel 30 through the diaphragm 14, so that the image display of the liquid crystal panel 30 is realized, wherein the light-emitting strips 15 can be LED light strips.

Further, two opposite side walls of the mounting cavity 111 are provided with positioning blocks 16, specifically, the two positioning blocks 16 are respectively located at the left and right sides of the back plate 11; the positioning block 16 is provided with a first positioning notch 1611, two opposite sides of the light guide plate 13 are provided with first positioning protrusions 131, and the first positioning protrusions 131 are respectively clamped in the first positioning notches 1611.

In the backlight 10 of the embodiment of the application, since the light-emitting strips 15 are installed on the back plate 11 at the upper and lower sides of the installation cavity 111, and meanwhile, the positioning blocks 16 are respectively arranged at the left and right sides of the back plate 11, and the first positioning protrusions 131 at the left and right sides of the light guide plate 13 are respectively clamped in the first positioning notches 1611 on the positioning blocks 16, the light guide plate 13 cannot move up and down, so that the light guide plate 13 can be fixed at the middle position of the two light-emitting strips 15, the distances from the light guide plate 13 to the two light-emitting strips 15 are equal, the two light-emitting strips 15 enter the light guide plate 13 at the same incident light distance, the light distribution uniformity on the light guide plate 13 is good, and the display uniformity is high; simultaneously, under the moisture absorption inflation and the thermal expansion situation of being met, light guide plate 13 is the same to the expanded distance of two light-emitting strip 15, it is the same to guarantee that light guide plate 13 is the same to the distance of two light-emitting strip 15, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (like under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency, make backlight unit 1 and the display device who installs this backlight 10 have hi-lite and high degree of consistency, let the user have better experience.

It should be noted that the middle frame 20 is disposed around the backlight source 10 and the liquid crystal panel 30, the inner wall surface of the middle frame 20 is provided with a rib 21, the liquid crystal panel 30 is installed in the middle frame 20 from one side and is adhered to the rib 21 through a double-sided tape, the backlight source 10 is installed in the middle frame 20 from the other side, and the film 14 is disposed close to the liquid crystal panel 30, so as to complete the installation of the whole backlight module 1.

In the embodiment of the present application, the two positioning blocks 16 are respectively located at the left and right sides of the back plate 11 and at the middle position of the left and right sides of the back plate 11, wherein, it should be noted that the connection structure of the two positioning blocks 16 and the components such as the light guide plate 13 is the same, and the two positioning blocks are arranged symmetrically left and right, and only the structure of one positioning block 16 will be described below.

In another embodiment of the present application, as shown in fig. 5, 7 and 8, the positioning block 16 of the backlight 10 includes a connecting portion 161 and a fixing portion 162 connected to each other, the fixing portion 162 is fixed on the bottom surface of the cavity of the mounting cavity 111, the connecting portion 161 is attached to the sidewall of the mounting cavity 111, and the first positioning notch 1611 is disposed on an end surface of the connecting portion 161 facing away from the fixing portion 162. When mounting, the first positioning protrusion 131 of the light guide plate 13 can be directly placed into the first positioning notch 1611 from the front of the connecting portion 161, and the positioning of the light guide plate 13 is achieved by the limit action of the upper and lower wall surfaces of the first positioning notch 1611, and the positioning block 16 is fixed to the bottom surface of the mounting cavity 111 by the fixing portion 162, so that the fixing reliability of the positioning block 16 is good, the positioning of the light guide plate 13 is also good, and the reliability of the use of the backlight 10 is improved.

In the embodiment of the present application, as shown in fig. 8 and 10, a connecting protrusion 1621 is disposed on a side surface of the fixing portion 162 facing away from the connecting portion 161, a connecting hole 113 is formed on the back plate 11, and the connecting protrusion 1621 is embedded in the connecting hole 113, so as to fix the positioning block 16.

Wherein, the number of connecting protrusion 1621 can be two, three or more than three, and the quantity of connecting hole 113 is the same with the quantity of connecting protrusion 1621 to the one-to-one setting, its specific quantity can be selected according to actual need, only need guarantee parts such as locating piece 16 and light guide plate 13 can stable fixation on backplate 11.

In another embodiment of the present application, as shown in fig. 5, 7 and 10, a receiving notch 112 is formed in a position, corresponding to the positioning block 16, of a side wall of the mounting cavity 111 of the backlight source 10, a separating protrusion 1612 is formed on the side wall of the connecting block facing the mounting cavity 111, and the separating protrusion 1612 is U-shaped, extends along an edge of the first positioning notch 1611, and extends into the receiving notch 112; the partition protrusion 1612 is surrounded to form a second positioning notch 1613, the second positioning notch 1613 is communicated with the first positioning notch 1611, and the first positioning protrusion 131 is clamped in the first positioning notch 1611 and the second positioning notch 1613. When the light guide plate is used, the separating protrusion 1612 can separate the first positioning protrusion 131 on the light guide plate 13 from the side wall of the accommodating notch 112, so that the light guide plate 13 is prevented from being damaged due to contact with the back plate 11, meanwhile, the first positioning protrusion 131 can be clamped into the first positioning notch 1611 and the second positioning notch 1613 simultaneously, the clamping area of the light guide plate 13 and the positioning block 16 is large, the positioning of the light guide plate 13 is more reliable and stable, and the light guide stability and reliability are ensured.

In the embodiment of the present application, the inner wall surface of the first positioning notch 1611 may be flush with the inner wall surface of the second positioning notch 1613 in a one-to-one correspondence manner, so that the first positioning protrusion 131 has a simple structure and is convenient to manufacture; the first positioning notch 1611 and the second positioning notch 1613 may also be arranged in a staggered manner, so that the structure of the first positioning protrusion 131 is arranged in a staggered manner, and the specific structure thereof may be selected according to actual needs, which is not limited herein.

In another embodiment of the present application, as shown in fig. 5 and 10, the receiving gap 112 of the backlight 10 is provided to penetrate through the sidewall of the mounting cavity 111. Therefore, when the end surface of the first positioning protrusion 131 cannot contact the back plate 11, the back plate 11 is prevented from being damaged, and at this time, the positioning block 16 can completely separate the first protrusion from the back plate 11, thereby preventing the light guide plate 13 from contacting the back plate 11 and being damaged.

In this application embodiment, the terminal surface that separates arch 1612 flushes with the lateral surface of backplate 11, and the structure is regular like this, easy to assemble preparation.

In another embodiment of the present application, as shown in fig. 5 and fig. 7, an abutting protrusion 1614 is disposed on a side surface of the connecting portion 161 of the backlight 10 close to the light guide plate 13, the abutting protrusion 1614 is located on a side of the first positioning notch 1611, and the abutting protrusion 1614 abuts against a side edge of the light guide plate 13. The two abutting protrusions 1614 abut against the left and right sides of the light guide plate 13, so that the light guide plate 13 cannot move left and right, and left and right positioning of the light guide plate 13 can be achieved.

In another embodiment of the present application, as shown in fig. 5 and 7, the backlight 10 is provided with second positioning protrusions 141 at two opposite sides of the film 14, and the second positioning protrusions 141 are snapped into the first positioning notches 1611. Second location arch 141 of the left and right sides of diaphragm 14 is gone into respectively in the first location breach 1611 that corresponds, thereby realize the upper and lower location of diaphragm 14, in addition, the edge of diaphragm 14 also butt on butt arch 1614, location about realizing, diaphragm 14 and light guide plate 13 are all fixed through locating piece 16 like this, and need not to adopt other structures, a structure is simple, and simultaneously, the reliability of relative positioning between diaphragm 14 and the light guide plate 13 is good, the luminous effect is better like this, the luminance of demonstration is higher, the degree of consistency is better.

In the embodiment of the present application, as shown in fig. 5 and fig. 7, the abutting protrusion 1614 extends along the depth direction of the first positioning notch 1611 until contacting with the fixing portion 162, and the side edges of the light guide plate 13 and the membrane 14 abut against the abutting protrusion 1614, so as to achieve left and right positioning; the number of the abutting protrusions 1614 may also be three, four, or more than four, and the specific number thereof may be determined according to actual needs, which is not limited herein; illustratively, the number of abutment projections 1614 is two, and two abutment projections 1614 are located on opposite sides of the first positioning notch 1611.

In another embodiment of the present application, the back panel 11 of the backlight 10 is provided as an aluminum back panel 11. The back plate 11 is made of aluminum, and the aluminum has a high thermal conductivity coefficient and a high thermal conduction speed, and in addition, the aluminum back plate 11 has a large area and a large contact area with air, and can timely dissipate heat of the light source, the reflector plate 12, the light guide plate 13 and the membrane 14, so that the backlight source 10 has good heat dissipation performance, and a display device provided with the backlight source 10 has good heat dissipation performance.

In the embodiment of the present application, as shown in fig. 6 and fig. 11, in another embodiment of the present application, the light emitting bars 15 of the backlight source 10 are adhered to the side wall of the mounting cavity 111 through the heat dissipation glue 151, that is, the light emitting bars 15 are adhered to the back plate 11 through the heat dissipation glue 151, so that heat generated by the light emitting bars 15 can be transferred to the back plate 11 through the heat dissipation glue 151, the back plate 11 has a large heat dissipation area and a large contact area with air, and the heat of the back plate 11 is effectively dissipated by using the air convection principle.

In another embodiment of the present application, a backlight module 1 is provided, which includes the backlight 10.

In the backlight module 1 of the embodiment of the application, since the backlight source 10 is adopted, the distances from the light guide plate 13 to the two light-emitting strips 15 are equal, the two light-emitting strips 15 enter the light guide plate 13 at the same incident light distance, the light distribution uniformity on the light guide plate 13 is good, and the display uniformity of the backlight module 1 is high; simultaneously, under the moisture absorption inflation and the thermal expansion situation of being met, light guide plate 13 is the same to the expanded distance of two light-emitting strip 15, it is the same to guarantee that light guide plate 13 is the same to the distance of two light-emitting strip 15, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (like under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency, make backlight unit 1 who installs this backlight 10 have hi-lite and high degree of consistency, let the user have better experience.

The assembly process of the backlight module 1 is described as follows:

adhering the double-sided adhesive to the convex ribs 21 of the middle frame 20, and adhering the liquid crystal panel 30 to the double-sided adhesive to form an assembly whole;

the two light-emitting strips 15 are adhered with the heat dissipation glue 151, the two heat dissipation glue 151 are respectively adhered to the wall surface of the mounting cavity 111 of the back plate 11, the two positioning blocks 16 are respectively fixed on the left side wall and the right side wall of the back plate 11, the reflector plate 12, the light guide plate 13 and the diaphragm 14 are assembled in the mounting cavity 111 of the back plate 11 layer by layer to form an integral assembly part, and the assembly part is installed in the middle frame 20 on which the liquid crystal panel 30 is installed, so that the installation of the whole backlight module 1 is completed, the backlight module 1 is respectively assembled by two parts and then assembled together, and the installation operation is more flexible, simple, convenient and rapid.

In another embodiment of the present application, a display device is provided, which includes the backlight module 1.

According to the display device of the embodiment of the application, due to the adoption of the backlight module 1, the distances from the light guide plate 13 to the two light-emitting strips 15 are equal, the two light-emitting strips 15 enter the light guide plate 13 at the same incident light distance, the light distribution uniformity on the light guide plate 13 is good, and the display uniformity of the display device is high; simultaneously, under the moisture absorption inflation and the thermal expansion situation of being met, light guide plate 13 is the same to the expanded distance of two light-emitting strip 15, guarantees that light guide plate 13 is the same to the distance of two light-emitting strip 15, so alright guarantee can keep the income light distance of both sides the same under normal use and various extreme conditions (like under the high temperature and high humidity condition), thereby reach stable hi-lite and high degree of consistency, make and install this display device and have hi-lite and high degree of consistency, let the user have better experience.

It should be noted that the backlight module 1 shown in fig. 1 of the present application is suitable for being installed in a curved display device, and of course, in other embodiments, the backlight module 1 of the present application may be applied to a flat display device.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A backlight source comprises a back plate, a reflector plate, a light guide plate, a diaphragm and two light-emitting strips, wherein the back plate is provided with an installation cavity, the reflector plate, the light guide plate and the diaphragm are sequentially stacked in the installation cavity, and the two light-emitting strips are respectively installed on two opposite side walls of the installation cavity; the method is characterized in that: the other opposite two side walls of the installation cavity are provided with positioning blocks, the positioning blocks are provided with first positioning notches, the opposite two side edges of the light guide plate are provided with first positioning protrusions, and the first positioning protrusions are respectively clamped in the first positioning notches.

2. The backlight of claim 1, wherein: the locating piece is including connecting portion and the fixed part that is connected, the fixed part is fixed in on the chamber bottom surface of installation cavity, connecting portion laminate in on the lateral wall of installation cavity, first locating breach set up in connecting portion dorsad on the terminal surface of fixed part.

3. The backlight of claim 2, wherein: the side wall of the mounting cavity and the position corresponding to the positioning block are provided with accommodating notches, the connecting part is provided with separating bulges facing the side wall of the mounting cavity, and the separating bulges are U-shaped, extend along the edge of the first positioning notch and extend into the accommodating notches;

4. The backlight of claim 3, wherein: the accommodating notch penetrates through the side wall of the mounting cavity.

5. The backlight of claim 3, wherein: the side face of the connecting portion, which is close to the light guide plate, is provided with a butting bulge, the butting bulge is located on the side face of the first positioning notch, and the butting bulge abuts against the side edge of the light guide plate.

6. The backlight according to any one of claims 1 to 5, wherein: and second positioning bulges are also arranged at the two opposite side edges of the diaphragm and are clamped in the first positioning notches.

7. The backlight according to any one of claims 1 to 5, wherein: the back plate is an aluminum back plate.

8. The backlight according to any one of claims 1 to 5, wherein: the light-emitting strip is adhered to the side wall of the mounting cavity through the heat-dissipation adhesive.

9. A backlight module is characterized in that: comprising the backlight according to any one of claims 1 to 8.

10. A display device, characterized in that: comprising a backlight module as claimed in claim 9.