CN216792639U - Backlight module and display device - Google Patents

Abstract

The utility model relates to the technical field of liquid crystal display, and discloses a backlight module and a display device. The display device comprises a backlight module and a display panel, wherein the backlight module comprises a light guide plate, a positioning assembly and an optical diaphragm, the light guide plate is arranged in an X-Y plane, the positioning assembly comprises a fixing part and a T-shaped limiting part, the fixing part is connected with the light guide plate, the T-shaped limiting part comprises a longitudinal part and a transverse part, the longitudinal part extends along the Z direction and is connected with the fixing part, the transverse part and the light guide plate are arranged at intervals, a positioning hole is formed in the optical diaphragm, and the positioning hole is sleeved on the longitudinal part so that the optical diaphragm is limited between the transverse part and the light guide plate along the Z direction. The backlight module has good connection reliability between the optical film and the light guide plate, and the optical film is free from jamming and corrugation in the using process. According to the display device, the backlight module is arranged, so that the optical film is not easy to generate corrugated wrinkles, and the display effect is good.

Description

Backlight module and display device

Technical Field

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

Background

The liquid crystal display device has the advantages of low operating voltage, light weight, small volume and the like, and is widely applied to various display devices. The liquid crystal display device comprises a backlight module and a liquid crystal display panel, wherein the backlight module provides a light source for the liquid crystal display panel, and the liquid crystal display panel changes the orientation of liquid crystal molecules and controls the strength of light transmission by utilizing the change of electric field intensity applied to the liquid crystal molecules, so that the display of images is realized. The backlight module comprises a back plate, a light source, a light guide plate and a plurality of layers of optical films, wherein the light guide plate and the plurality of layers of optical films are sequentially arranged on the back plate, and the light source can be arranged between the light guide plate and the back plate or can be arranged on the side of the light guide plate.

In the prior art, as shown in fig. 1 and fig. 2, the optical film 3 ' and the light guide plate 2 ' are connected in a manner that the light guide plate 2 ' is disposed on the back plate 1 ', a positioning column 21 ' is disposed on a side of the light guide plate 2 ' away from the back plate 1 ', a positioning hole 31 ' is correspondingly disposed on the optical film 3 ', and the positioning hole 31 ' is sleeved on the corresponding positioning column 21 ' to achieve connection between the optical film 3 ' and the light guide plate 2 '. However, as the display device tends to be light, thin and narrow, the size and height of the positioning posts 21 ' cannot be set too large, so that the optical film 3 ' on the uppermost layer can easily come off from the positioning posts 21 ' and be locked between the positioning posts 21 ' and the middle frame 4 ' of the backlight module during the use process. In the working process of the backlight module, the optical film 3 'expands due to temperature rise, and after the end part of the optical film 3' is clamped between the positioning column 21 'and the middle frame 4', the optical film 3 'cannot expand and move towards the end part, so that corrugated wrinkles are generated in the middle of the optical film 3', and the display effect of the display device is affected.

Therefore, a backlight module and a display device are needed to solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

One objective of the present invention is to provide a backlight module, which has a good connection reliability between an optical film and a light guide plate, and the optical film does not get stuck or have ripple wrinkles during use.

Another objective of the present invention is to provide a display device, in which the backlight module is disposed, so that the optical film is not prone to generate moire and the display effect is good.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a backlight module, comprising:

a light guide plate disposed in an X-Y plane;

the positioning assembly comprises a fixing piece and a T-shaped limiting piece, the fixing piece is connected with the light guide plate, the T-shaped limiting piece comprises a longitudinal portion and a transverse portion, the longitudinal portion extends along the Z direction and is connected with the fixing piece, and the transverse portion and the light guide plate are arranged at intervals;

and the optical diaphragm is provided with a positioning hole which is sleeved on the longitudinal part so as to enable the optical diaphragm to be limited between the transverse part and the light guide plate along the Z direction.

Preferably, the two ends of the light guide plate along the X direction are symmetrically provided with the positioning assemblies, the two ends of the optical film along the X direction are respectively provided with positioning holes, and each positioning hole correspondingly penetrates through the edge of the optical film adjacent to the positioning hole along the X direction, so that each longitudinal portion can penetrate into the corresponding positioning hole along the X direction.

Preferably, the transverse portion comprises a long side and a short side in an X-Y plane, and the longitudinal portion is rotatable about a Z-axis relative to the mount to switch the long side of the transverse portion between being parallel to the X-direction and being parallel to the Y-direction.

Preferably, be provided with the through-hole on the mounting, the through-hole orientation the ring is equipped with heavy groove around the one end of light guide plate, locating component still includes limit baffle, limit baffle set up in heavy inslot, longitudinal portion wear to establish in proper order the through-hole with heavy groove and with limit baffle connects.

Preferably, the positioning assembly further comprises an elastic member, one end of the elastic member is connected with the fixing member, and the other end of the elastic member is connected with the T-shaped limiting member, so that the T-shaped limiting member can float relative to the fixing member along the Z direction.

Preferably, the fixing piece is provided with a threaded hole, the longitudinal portion is provided with an external thread, and the longitudinal portion penetrates into the threaded hole and is in threaded connection with the threaded hole.

Preferably, a fastening glue is coated in the threaded hole.

Preferably, the fixing piece comprises a longitudinal plate and a transverse plate, the longitudinal plate is attached to the end face of the light guide plate, and the transverse plate is attached to the surface, parallel to the X-Y plane, of the light guide plate and is located in the positioning hole;

at least one of the longitudinal plate and/or the transverse plate is bonded with the light guide plate.

Preferably, the fixing piece further comprises a matching sleeve extending along the Z direction in the axial direction, the matching sleeve is connected with the transverse plate, and the longitudinal portion penetrates through the matching sleeve.

A display device is characterized by comprising the backlight module.

The utility model has the beneficial effects that:

the backlight module realizes the connection between the T-direction limiting piece and the light guide plate through the fixing piece, so a positioning structure does not need to be formed on the light guide plate, the manufacture of the light guide plate is simpler, a spacing space is formed between the transverse part of the T-shaped limiting piece and the light guide plate, and the transverse part and the light guide plate can respectively limit the two ends of the optical membrane along the Z direction after the positioning hole on the optical membrane is sleeved on the longitudinal part, thereby preventing the optical membrane from being separated from the positioning assembly, further avoiding the situation that the optical membrane is clamped between the positioning assembly and a rubber frame of the backlight module, ensuring that the end part of the optical membrane can freely move in an X-Y plane when the temperature rises and expands, and avoiding the optical membrane from generating ripple wrinkles. In addition, because the transverse part can be well limited to the optical diaphragm, the longitudinal part can be set to be smaller in size, the length direction of the transverse part is set to be parallel to the edge direction of the optical diaphragm, and the use of the narrow-frame display device can be met.

According to the display device, by arranging the backlight module, the connection reliability of all parts is good, the optical membrane is not easy to generate corrugated folds, the display effect is good, and the display device can be made into a narrower frame.

Drawings

FIG. 1 is a cross-sectional view of a backlight module provided in the prior art at a connection position of a light guide plate and an optical film;

fig. 2 is a schematic structural diagram illustrating that an optical film of a backlight module provided in the prior art is stuck and has a ripple wrinkle.

Fig. 3 is a schematic view of a partial structure of a backlight module according to an embodiment of the utility model;

FIG. 4 is a schematic structural diagram of a positioning assembly according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of a backlight module at a connection position of a light guide plate and an optical film according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a backlight module at a connection position of a light guide plate and an optical film according to a second embodiment of the present invention.

In the figure:

1' -a backsheet; 2' -a light guide plate; 21' -a locating post; a 3' optical film; 31' -a locating hole; 4' -middle frame;

1-a light guide plate;

2-a positioning assembly; 21-a fixing member; 211-longitudinal plates; 212-a transverse plate; 2121-sinking a groove; 213-mating sleeve; 2131-a through hole; 2132-a threaded hole; 22-T type limit piece; 221-a longitudinal portion; 222-a transverse portion; 23-a limit baffle; 24-an elastic member;

3-an optical film; 31-a positioning hole;

4-glue layer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to be limiting.

Example one

The embodiment provides a backlight module and a display device. The display device comprises a backlight module and a display panel, wherein the display panel is supported on the backlight module. Specifically, the display panel may be a liquid crystal display panel, so that the display device constitutes a liquid crystal display device. Preferably, fig. 3 is a schematic view of a partial structure of the backlight module provided in this embodiment, the backlight module includes a back plate, a light source, a light guide plate 1 and an optical film 3, wherein the light guide plate 1 and the optical film 3 are sequentially disposed on the back plate. Alternatively, the light source may be disposed between the light guide plate 1 and the back plate, thereby constituting a direct type backlight module. The light source may be disposed at a side of the light guide plate 1 to form a side-in type backlight module. It should be noted that, in this embodiment, the optical film 3 includes multiple layers of films stacked together, and the specific types and functions of the films of the respective layers are the prior art and are not described herein again. In fig. 1, the X direction, the Y direction and the Z direction respectively represent three mutually perpendicular directions in space, and the embodiment is described by taking the light guide plate 1 as an example of being located on an X-Y plane.

Fig. 4 is a schematic structural diagram of a positioning assembly 2 provided in this embodiment, and fig. 5 is a cross-sectional view of the backlight module provided in this embodiment at a connection position between a light guide plate 1 and an optical film 3, as shown in fig. 3-5, the backlight module further includes a positioning assembly 2, the positioning assembly 2 is used for connecting the light guide plate 1 and the optical film 3, specifically, the positioning assembly 2 includes a fixing member 21 and a T-shaped limiting member 22, the fixing member 21 is connected with the light guide plate 1, the T-shaped limiting member 22 includes a longitudinal portion 221 and a transverse portion 222, the longitudinal portion 221 extends along a Z direction and is connected with the fixing member 21, the transverse portion 222 is spaced from the light guide plate 1, a positioning hole 31 is provided on the optical film 3, and the positioning hole 31 is sleeved on the longitudinal portion 221 so that the optical film 3 is limited between the transverse portion 222 and the light guide plate 1 along the Z direction.

In the backlight module of the present embodiment, the fixing member 21 is used to connect the T-directional limiting member with the light guide plate 1, so that there is no need to form a positioning structure on the light guide plate 1, the manufacturing of the light guide plate 1 is simpler, and a space is formed between the transverse portion 222 of the T-shaped limiting member 22 and the light guide plate 1, after the positioning hole 31 on the optical film 3 is sleeved on the longitudinal portion 221, the transverse portion 222 and the light guide plate 1 respectively limit the two ends of the optical film 3 along the Z-direction, thereby preventing the optical film 3 from coming off from the positioning assembly 2, further preventing the optical film 3 from being stuck between the positioning assembly 2 and the rubber frame of the backlight module, ensuring that the end of the optical film 3 can freely move in the X-Y plane when the temperature rises and expands, and preventing the optical film 3 from generating ripple wrinkles. In addition, since the transverse portion 222 can well limit the optical film 3, the longitudinal portion 221 can be set to have a smaller size, and the length direction of the transverse portion 222 is set to be parallel to the edge direction of the optical film 3, which can meet the use requirement of the narrow-frame display device. The display device of this embodiment, through setting up foretell backlight unit, each part is connected the good reliability, and optics diaphragm 3 is difficult for producing the ripple fold, and display effect is good, and can make narrower frame.

In this embodiment, as shown in fig. 3 and 4, the transverse portion 222 has a plate-like structure, and the longitudinal portion 221 has a cylindrical structure. Preferably, the dimension of the positioning hole 31 in the X direction is larger than the diameter of the longitudinal portion 221, so that the optical film 3 can move in the X direction relative to the longitudinal portion 221, and the optical film 3 is prevented from being heated and expanded to generate wavy wrinkles. Preferably, the lateral portion 222 is made of a metal material, and the lateral portion 222 made of the metal material can be set to a thin size while ensuring sufficient strength, so that the overall thickness size of the display device can be made smaller. Preferably, in this embodiment, the transverse portion 222 is rectangular in shape in the X-Y plane, and the rectangle includes a long side and a short side, as shown in fig. 3, when the backlight module is assembled, the long side of the transverse portion 222 is parallel to the corresponding edge direction of the optical film 3, that is, the long side of the transverse portion 222 is parallel to the Y direction, so that the display device can be configured as a narrower frame.

Preferably, as shown in fig. 3, the positioning assemblies 2 are symmetrically disposed at two ends of the light guide plate 1 along the X direction, the two ends of the optical film 3 along the X direction are respectively disposed with positioning holes 31, and each positioning hole 31 correspondingly penetrates through the edge of the optical film 3 adjacent to the positioning hole 31 along the X direction, so that each longitudinal portion 221 can penetrate into the corresponding positioning hole 31 along the X direction. Therefore, when assembling the backlight module, the positioning assembly 2 can be fixed on the light guide plate 1, and then the optical film 3 is properly bent, so that the optical film 3 is in an arched state along the middle of the X direction, so as to ensure that the two positioning holes 31 at the two ends of the optical film 3 along the X direction are respectively opposite to the corresponding longitudinal portions 221, and then the optical film 3 is loosened, the two ends of the optical film 3 along the X direction respectively move in the opposite directions along the X direction, and the positioning holes 31 can be sleeved on the corresponding longitudinal portions 221 in the process. The optical film 3 is installed without disassembling the fixing member 21 and the T-shaped limiting member 22, and the installation and operation are convenient. In addition, the positioning holes 31 at the two ends of the optical film 3 in the X direction are respectively matched with the longitudinal parts 221 of the two symmetrical positioning assemblies 2, so that the optical film 3 can be limited in the X direction, the optical film 3 is prevented from moving in the X direction and being separated from the positioning assemblies 2, and the reliability of the installation of the optical film 3 is ensured.

Preferably, as shown in fig. 4 and 5, the fixing member 21 includes a vertical plate 211 and a horizontal plate 212, the vertical plate 211 is attached to an end surface of the light guide plate 1, and the horizontal plate 212 is attached to a surface of the light guide plate 1 parallel to the X-Y plane. The fixing member 21 is respectively engaged with the light guide plate 1 through both surfaces, and the positional accuracy of the fixing member 21 with respect to the light guide plate 1 can be ensured. Further, the horizontal plate 212 is accommodated in the positioning hole 31 of the optical film 3, so that the increase of the thickness of the backlight module caused by the arrangement of the horizontal plate 212 can be prevented, and the overall thickness of the display device is ensured to be thinner. Alternatively, at least one of the vertical plate 211 and the horizontal plate 212 is adhesively connected to the light guide plate 1. The mode operation of adhesive connection is more convenient, and the thickness of the adhesive layer 4 is thinner, so that excessive influence on the width or thickness of the backlight module can be avoided. In this embodiment, as shown in fig. 5, an adhesive layer 4 is disposed between the vertical plate 211 and the end surface of the light guide plate 1 to connect the fixing member 21 and the light guide plate 1. In other embodiments, an adhesive layer may be disposed between the horizontal plate 212 and the surface of the light guide plate 1 parallel to the X-Y plane, or disposed between the vertical plate 211 and the end surface of the light guide plate 1, or disposed between the horizontal plate 212 and the surface of the light guide plate 1 parallel to the X-Y plane, and the arrangement is selected as needed, which is not limited herein.

Preferably, as shown in fig. 4 and 5, the fixing member 21 further includes an engaging sleeve 213 extending along the Z-axis direction, the engaging sleeve 213 is connected with the transverse plate 212, and the longitudinal portion 221 of the T-shaped limiting member 22 is inserted through the engaging sleeve 213. The arrangement of the engaging sleeve 213 can increase the engaging length of the longitudinal portion 221 and the fixing member 21, thereby ensuring the installation accuracy between the T-shaped limiting member 22 and the fixing member 21.

Preferably, as shown in fig. 4 and 5, the longitudinal portion 221 is rotatable about the Z-axis relative to the fixed member 21, so that the long side of the lateral portion 222 can be switched between being parallel to the Y-direction and being parallel to the X-direction. As shown in fig. 5, when the optical film 3 is assembled, the longitudinal portion 221 may be driven to rotate around the Z axis, so that the long edge of the transverse portion 222 is parallel to the X direction, at this time, the optical film 3 may be directly placed on the light guide plate 1 from top to bottom along the Z direction, and the two positioning holes 31 are respectively sleeved with the corresponding longitudinal portion 221, and then the longitudinal portion 221 is driven to rotate around the Z axis, so that the long edge of the transverse portion 222 is parallel to the Y direction, and the optical film 3 may be limited. By providing the longitudinal portion 221 to rotate about the Z axis, it is not necessary to bend the optical film 3 when mounting the optical film 3, further improving the mounting convenience of the optical film 3.

Specifically, as shown in fig. 5, in this embodiment, the fixing member 21 is provided with a through hole 2131, a sinking groove 2121 is annularly formed around one end of the through hole 2131 facing the light guide plate 1, the positioning assembly 2 further includes a limiting baffle 23, the limiting baffle 23 is disposed in the sinking groove 2121, and the longitudinal portion 221 sequentially penetrates through the through hole 2131 and the sinking groove 2121 and is connected to the limiting baffle 23. The through hole 2131 is matched with the longitudinal portion 221, so that the T-shaped limiting piece 22 can rotate around the Z axis, and the limiting baffle 23 is arranged to realize the connection between the T-shaped limiting piece 22 and the fixing piece 21, so that the separation between the T-shaped limiting piece 22 and the fixing piece 21 is avoided. Specifically, in this embodiment, the diameter of the through hole 2131 is larger than that of the longitudinal portion 221, and the diameter of the sinking groove 2121 is larger than that of the limiting baffle 23, so as to ensure that the T-shaped limiting member 22 can smoothly rotate around the Z-axis. Further, the through hole 2131 is provided on the fitting sleeve 213, and the sinking groove 2121 is provided on a side of the lateral portion 222 facing the light guide plate 1. The engagement sleeve 213 can guide the rotation of the longitudinal portion 221 about the Z-axis.

Further, the positioning assembly 2 further includes an elastic element 24, one end of the elastic element 24 is connected to the fixing element 21, and the other end is connected to the T-shaped limiting element 22, on one hand, two ends of the elastic element 24 are respectively connected to the fixing element 21 and the T-shaped limiting element 22, and when the T-shaped limiting element 22 is not driven by an external force, the elastic element 24 enables the T-shaped limiting element 22 to maintain a fixed relative position with the fixing element 21, in this embodiment, the elastic element 24 may be configured as: when the T-shaped limiting element 22 is not subjected to an external force, the elastic element 24 makes the long side of the transverse portion 222 of the T-shaped limiting element 22 parallel to the Y-direction, i.e., a position for limiting the optical film 3 can be achieved. On the other hand, the elastic member 24 may also enable the T-shaped limiting member 22 to have the ability to float relative to the fixing member 21 along the Z-direction, so as to compensate the expansion amount of the optical film 3 generated in the Z-direction, and avoid the T-shaped limiting member 22 from damaging the optical film 3 due to too tight clamping force of the optical film 3 along the Y-direction. Preferably, in this embodiment, the elastic element 24 is a spring, the spring is sleeved on the longitudinal portion 221 and is located in the through hole 2131 of the engaging sleeve 213, and the engaging sleeve 213 can guide the deformation direction of the spring, so that the T-shaped limiting element 22 floats up and down only along the Z-direction.

Example two

The embodiment provides a backlight module and a display device, wherein the display device comprises the backlight module and a display panel, and the display panel is supported on the backlight module. The general structure and the operation principle of the backlight module in this embodiment are the same as those of the backlight module in the first embodiment, except for the connection manner between the T-shaped position-limiting member 22 and the fixing member 21, and the same parts are not described herein again, and the differences are as follows:

as shown in fig. 6, the fixing member 21 is provided with a screw hole 2132, the longitudinal portion 221 is provided with a male screw, and the longitudinal portion 221 is inserted into the screw hole 2132 and screwed into the screw hole 2132. The connection between the T-shaped limiting member 22 and the fixing member 21 can be conveniently realized by a threaded connection, and the T-shaped limiting member 22 can be ensured to rotate around the Z axis relative to the fixing member 21, so that the long side of the transverse portion 222 can be switched between being parallel to the X axis and being parallel to the Y axis. In addition, the spacing distance between the transverse portion 222 and the light guide plate 1 can be adjusted by rotating the T-shaped limiting member 22, so that the degree of tightness of the T-shaped limiting member 22 for limiting the optical film 3 along the Y direction can be adjusted as required. Specifically, in the present embodiment, as shown in fig. 6, the screw hole 2132 is provided in the fitting sleeve 213, so that a sufficient screw fitting length can be ensured. Alternatively, the threaded hole 2132 may be a through hole or a blind hole, and is not particularly limited herein.

Preferably, a fastening glue is coated in the threaded hole 2132. After the optical film 3 is mounted and the transverse portion 222 of the T-shaped limiting element 22 is adjusted to a proper position, the fastening glue is injected into the threaded hole 2132 to lock the positions of the T-shaped limiting element 22 and the fixing element 21, so that the T-shaped limiting element 22 is prevented from being loosened.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the utility model and are not to be construed as limitations of the embodiments of the present invention, but may be modified in various embodiments and applications by those skilled in the art according to the spirit of the present invention, and the content of the present description should not be construed as a limitation of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A backlight module, comprising:

a light guide plate (1) disposed in an X-Y plane;

the positioning assembly (2) comprises a fixing piece (21) and a T-shaped limiting piece (22), the fixing piece (21) is connected with the light guide plate (1), the T-shaped limiting piece (22) comprises a longitudinal portion (221) and a transverse portion (222), the longitudinal portion (221) extends along the Z direction and is connected with the fixing piece (21), and the transverse portion (222) and the light guide plate (1) are arranged at intervals;

the optical film (3) is provided with a positioning hole (31), and the positioning hole (31) is sleeved on the longitudinal portion (221) so that the optical film (3) is limited between the transverse portion (222) and the light guide plate (1) along the Z direction.

2. The backlight module according to claim 1, wherein the positioning members (2) are symmetrically disposed at two ends of the light guide plate (1) along the X-direction, the two ends of the optical film (3) along the X-direction are respectively disposed with positioning holes (31), each positioning hole (31) penetrates the edge of the optical film (3) adjacent to the positioning hole along the X-direction, so that each longitudinal portion (221) can penetrate the corresponding positioning hole (31) along the X-direction.

3. A backlight module according to claim 2, characterized in that the transverse portion (222) comprises long sides and short sides in an X-Y plane, and the longitudinal portion (221) is rotatable about a Z-axis relative to the holder (21) to switch the long sides of the transverse portion (222) between being parallel to the X-direction and being parallel to the Y-direction.

4. The backlight module as claimed in claim 3, wherein the fixing member (21) has a through hole (2131), a recessed groove (2121) is formed around one end of the through hole (2131) facing the light guide plate (1), the positioning assembly (2) further includes a position-limiting baffle (23), the position-limiting baffle (23) is disposed in the recessed groove (2121), and the longitudinal portion (221) sequentially penetrates through the through hole (2131) and the recessed groove (2121) and is connected to the position-limiting baffle (23).

5. The backlight module as claimed in claim 4, wherein the positioning assembly (2) further comprises an elastic member (24), one end of the elastic member (24) is connected to the fixing member (21), and the other end is connected to the T-shaped limiting member (22), so that the T-shaped limiting member (22) can float relative to the fixing member (21) along the Z-direction.

6. The backlight module as claimed in claim 3, wherein the fixing member (21) has a threaded hole (2132), the longitudinal portion (221) has an external thread, and the longitudinal portion (221) penetrates the threaded hole (2132) and is in threaded connection with the threaded hole (2132).

7. The backlight module as claimed in claim 6, wherein the screw hole (2132) is coated with a fastening glue.

8. The backlight module according to any of claims 1-7, wherein the fixing member (21) comprises a longitudinal plate (211) and a transverse plate (212), the longitudinal plate (211) is attached to the end surface of the light guide plate (1), and the transverse plate (212) is attached to the surface of the light guide plate (1) parallel to the X-Y plane and located in the positioning hole (31);

at least one of the longitudinal plate (211) and/or the transverse plate (212) is adhesively connected with the light guide plate (1).

9. The backlight module as claimed in claim 8, wherein the fixing member (21) further comprises a fitting sleeve (213) extending axially along the Z-direction, the fitting sleeve (213) is connected to the horizontal plate (212), and the longitudinal portion (221) penetrates through the fitting sleeve (213).

10. A display device comprising the backlight module according to any one of claims 1 to 9.

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