Backlight module and display device

Abstract

The present application relates to a backlight module and a display device. The backlight module includes a backlight panel, a light bar and a light guide plate. A cavity is formed in the backlight panel. The light bar and the light guide plate are arranged in the cavity, and the light bar is located on one side of the light guide plate. The inner wall of the backlight panel extends toward the cavity to form at least one limiter. The limiter and the light bar are located on different sides of the light guide plate. The limiter is made of elastic material. When the limiter is in a naturally extended state, the orthographic projection of the limiter on the backlight panel in a direction away from the light emitting direction is a first projection, and the orthographic projection of the installation position of the light guide plate on the backlight panel in a direction away from the light emitting direction is a second projection, and the first projection and the second projection overlap with each other. The present application can make the gap between the light guide plate and the limiter after assembly to be zero through the above method, so as to pass the rigorous vibration test.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] As backlight module products are used more and more widely, the requirements for backlight module products are becoming more and more stringent, and the tightness of the backlight module structure is closely related to the reliability of the backlight module products.

[0003] In particular, the backlight modules used in vehicles have more stringent requirements on clearance and airtightness in order to pass the vibration test. Usually, the internal clearance of the product, especially the clearance between the light guide plate and the limiter, is designed to be almost zero after assembly. However, this will place particularly high requirements on the tolerance of the material, which is not conducive to the mass assembly of the product. Summary of the invention

[0004] The present application aims to provide a backlight module and a display device, which can make the gap between the light guide plate and the limiter after assembly to be zero, so as to pass the rigorous vibration test.

[0005] In the first aspect, an embodiment of the present application proposes a backlight module, comprising a backlight panel, a light strip and a light guide plate, wherein a cavity is formed in the backlight panel, the light strip and the light guide plate are arranged in the cavity, and the light strip is located on one side of the light guide plate, and the inner wall of the backlight panel extends toward the cavity to form at least one limit member, and the limit member and the light strip are located on different sides of the light guide plate; the limit member is made of elastic material, and when the limit member is in a naturally extended state, the orthographic projection of the limit member on the backlight panel along a direction away from the light emitting direction is a first projection, and the orthographic projection of the installation position of the light guide plate on the backlight panel along a direction away from the light emitting direction is a second projection, and the first projection and the second projection overlap with each other.

[0006] In one embodiment of the present application, the size of the overlapping portion of the first projection and the second projection is 0.1 mm.

[0007] In one embodiment of the present application, the limiting member includes: a first limiting portion, which is arranged on the side wall of the backlight panel and is straight; and a second limiting portion, which is connected to the first limiting portion at an angle, is straight, and is bent to extend toward the light guide plate.

[0008] In one embodiment of the present application, the limiting member further includes: a third limiting portion, the third limiting portion is connected between the first limiting portion and the second limiting portion, and the third limiting portion is straight, so that the limiting member forms a closed triangular frame.

[0009] In one embodiment of the present application, the limiting member includes: a first limiting portion, the first limiting portion is arranged on the side wall of the backlight panel, and the first limiting portion is straight; and a fourth limiting portion, two ends of the fourth limiting portion are respectively connected to the two ends of the first limiting portion, the fourth limiting portion is arc-shaped, and the fourth limiting portion protrudes toward the direction of the light guide plate, so that the limiting member is a closed semicircular frame.

[0010] In one embodiment of the present application, the backlight panel includes: a backlight panel body; and a baffle plate, wherein the baffle plate is enclosed around the outer periphery of the backlight panel body to form the cavity, and the limiting member is formed by extending from the baffle plate toward the cavity.

[0011] In one embodiment of the present application, the baffle plate includes: a first baffle plate, which is enclosed around the outer periphery of the backlight panel body to form the cavity; and a second baffle plate, which is arranged on a side of the first baffle plate away from the backlight panel body, and a buckle is provided on the side of the second baffle plate facing the backlight panel body, the buckle and the first baffle plate are detachably connected, and the limit member is connected to the matching position of the buckle and the first baffle plate.

[0012] In one embodiment of the present application, the first enclosure plate and the second enclosure plate are staggered in the vertical direction, the first enclosure plate is located on the inner side of the second enclosure plate, and there is a gap between the buckle and the first enclosure plate, and the limiting member is clamped in the gap between the buckle and the first enclosure plate.

[0013] In one embodiment of the present application, the first enclosure plate and the second enclosure plate are aligned in the vertical direction, and the limiting member is arranged in contact with the connection between the buckle inner wall and the first enclosure plate inner wall.

[0014] In a second aspect, an embodiment of the present application further provides a display device, comprising: a display panel; and a backlight module as described in any one of the first aspects, wherein the backlight module is arranged on the backlight side of the display panel, and the backlight module is used to provide a light source to the display panel.

[0015] A backlight module provided according to an embodiment of the present application includes a backlight panel, a light bar and a light guide plate, a cavity is formed in the backlight panel, the light bar and the light guide plate are arranged in the cavity, and the light bar is located on one side of the light guide plate, and the inner wall of the backlight panel extends toward the cavity to form at least one limit member, and the limit member and the light bar are located on different sides of the light guide plate; the limit member is made of elastic material, and when the limit member is in a naturally extended state, the orthographic projection of the limit member on the backlight panel along the direction away from the light emitting direction is a first projection, and the orthographic projection of the installation position of the light guide plate on the backlight panel along the direction away from the light emitting direction is a second projection, and the first projection and the second projection overlap with each other. When the limit piece is naturally extended, it overlaps with the installation position of the light guide plate, that is, there is interference. After the light guide plate is assembled, the light guide plate squeezes the limit piece and deforms it, so that the gap between the light guide plate and the limit piece is zero, achieving a tight limiting effect, which is convenient for passing severe vibration and high temperature and high humidity environment tests. Moreover, this assembly method in which the limit piece interferes with the installation position of the limit piece has low requirements on material tolerance, which is conducive to the mass assembly of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are used for the same components. The accompanying drawings are not drawn according to the actual scale, but are only used to illustrate the relative position relationship. The layer thickness of some parts is exaggerated for easy understanding, and the layer thickness in the accompanying drawings does not represent the proportional relationship of the actual layer thickness.

[0017] Figure 1 A cross-sectional view of a backlight module provided in the first embodiment of the present application is shown;

[0018] Figure 2 A cross-sectional view of a backlight module provided in a second embodiment of the present application is shown;

[0019] Figure 3 A cross-sectional view of a backlight module provided in a third embodiment of the present application is shown;

[0020] Figure 4 A cross-sectional view of a backlight module provided in a fourth embodiment of the present application is shown;

[0021] Figure 5 A cross-sectional view of a display device provided in the fifth embodiment of the present application is shown.

[0022] Description of reference numerals:

[0023] 100, backlight module; 10, backlight panel; 11, backlight panel body; 12, baffle plate; 121, first baffle plate; 122, second baffle plate; 123, buckle; 20, limiter; 21, first limiter; 22, second limiter; 23, third limiter; 24, fourth limiter; 30, light guide plate; 40, reflector;

[0024] 200, display panel; 201, array substrate; 202, color filter substrate; 203, liquid crystal layer. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least part of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of the regional structure may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0026] The display device generally includes a display panel and a backlight module 100, wherein the display panel is a non-emissive light receiving element. The backlight module 100 is arranged on the backlight side of the display panel and is used to provide a light source for the display panel so that the display panel displays an image. The following description will be given by taking the display panel as a liquid crystal display panel 200 and the display device as a display device as an example.

[0027] In an edge-type display device, the backlight module 100 includes a backlight panel 10, a light bar and a light guide plate 30. A cavity is formed in the backlight panel 10. The light bar and the light guide plate 30 are arranged in the cavity, and the light bar is located on one side of the light guide plate 30. The inner wall of the backlight panel 10 extends toward the cavity to form at least one limit member 20. The limit member 20 and the light bar are located on different sides of the light guide plate 30.

[0028] For edge-entry display devices, in order to pass vibration and high-temperature and high-humidity environmental tests, the requirements for gaps and airtightness are more stringent. Usually, the internal gaps of the product, especially the gaps between the light guide plate 30 and the limiter 20 (the gaps can be set to reserve a gap for the light guide plate 30 to deform when the light guide plate 30 is deformed, to prevent the light guide plate 30 from being damaged by thermal expansion), are designed to be almost zero after assembly. However, this will place particularly high requirements on the tolerance of the material, which is not conducive to the mass assembly of the product.

[0029] In view of this, each embodiment of the present application provides a backlight module 100 and a display device including the backlight module 100, wherein the stopper 20 of the backlight module 100 is made of elastic material, and when the stopper 20 is in a naturally extended state, the orthographic projection of the stopper 20 on the backlight plate 10 in a direction away from the light emitting direction is a first projection, and the orthographic projection of the installation position of the light guide plate 30 on the backlight plate 10 in a direction away from the light emitting direction is a second projection, and the first projection and the second projection overlap with each other. When the stopper 20 is in a naturally extended state, it overlaps with the installation position of the light guide plate 30, that is, there is interference, and after the light guide plate 30 is assembled, the light guide plate 30 squeezes the stopper 20 to deform, so that the gap between the light guide plate 30 and the stopper 20 is zero, achieving a tight limit effect, which is convenient for passing severe vibration and high temperature and high humidity environment tests, and this assembly method in which the stopper 20 interferes with the installation position of the stopper 20 has low material tolerance requirements, which is conducive to the mass assembly of the product.

[0030] The specific structures of the backlight module 100 and the display device including the backlight module 100 provided in each embodiment of the present application are described below in conjunction with the accompanying drawings.

[0031] First embodiment

[0032] See also Figure 1 As shown, the backlight module 100 includes a backlight plate 10 and a reflective sheet 40, a light guide plate 30 and a light bar (not shown in the figure) arranged in the cavity, the limit member 20 and the light bar are respectively located on opposite sides of the light guide plate 30, and the reflective sheet 40 is arranged between the light guide plate 30 and the backlight plate 10.

[0033] Specifically, the size of the overlapped portion of the first projection and the second projection is 0.1 mm. During assembly, the size of the interfering overlapped portion can be designed as a negative value, such as a design of an overlap size of -0.1 mm. When the light guide plate 30 is assembled from top to bottom, the light guide plate 30 squeezes the limiter 20 to deform it, so that the distance between the light guide plate 30 and the limiter 20 is 0, achieving a tight limit effect and a tight sealing effect.

[0034] Furthermore, during the assembly process, compared with elastic return members (such as springs), the limit member 20 of the present embodiment has the advantage of more efficient assembly. On the one hand, one end of the elastic return member needs to be fixedly mounted on the backlight panel 10, and the other end is free to extend. On the other hand, in order to ensure that the elastic return member can expand and contract along its own length direction, when the light guide plate 30 is assembled from top to bottom, it is necessary to assemble the light guide plate 30 while controlling the other end of the elastic return member. The limit member 20 of the present embodiment can be directly clamped or bonded to the backlight panel 10, and when the light guide plate 30 is assembled from top to bottom, the assembly can be completed without controlling the limit member 20. Therefore, the limit member 20 of the present embodiment has higher assembly efficiency than elastic return members and the like.

[0035] The stopper 20 is an open structure, which includes: a first stopper 21, which is arranged on the side wall of the backlight plate 10 and is straight; and a second stopper 22, which is connected to the first stopper 21 at an angle, is straight, and is bent to extend toward the direction of the light guide plate 30. The bent first stopper 21 and the second stopper 22 are fixed to the inner wall of the backlight plate 10 through the first stopper 21, the second stopper 22 is connected to the first stopper 21 at an angle, and there is a reserved deformation space between the first stopper 21 and the second stopper 22, so that when the second stopper 22 is squeezed and deformed by the light guide plate 30, it can be deformed toward the deformation space, thereby being tightly connected with the light guide plate 30.

[0036] Furthermore, after the light bar irradiates the light guide plate 30, the heat generated causes the light guide plate 30 to expand, and the expansion direction is away from the light bar. A limiter 20 is provided on the side of the light guide plate 30 away from the light bar, and a reserved deformation space is provided between the first limiter 21 and the second limiter 22, so that the light guide plate 30 squeezes the second limiter 22 and deforms toward the deformation space, thereby preventing the expansion of the light guide plate 30 from squeezing the light bar.

[0037] In order to prevent the light guide plate 30 from being scratched, a roller structure may be provided at the portion where the second limiter 22 contacts the light guide plate 30 to reduce the friction resistance between the second limiter 22 and the light guide plate 30. In addition, the material of the limiter 20 may be selected to be a material with strong thermal conductivity, and the contact between the limiter 20 and the light guide plate 30 and the backlight plate 10 may be used to dissipate heat from the light guide plate 30, thereby extending the service life of the light guide plate 30.

[0038] In addition, due to the presence of the stopper 20, there is a gap between the light guide plate 30 and the side wall of the backlight plate 10, and some light cannot enter the area between the light guide plate 30 and the plastic frame, resulting in insufficient light at the edge of the display screen, resulting in a problem of light and dark difference between the edge of the screen and the middle of the screen, and poor user experience. In view of this, in this embodiment, a reflective layer (white paint), a photoluminescent layer (fluorescent layer) or a plurality of lamp beads are directly arranged on the side of the stopper 20 facing the cavity to supplement the light at the edge of the screen.

[0039] In this embodiment, the backlight panel 10 includes: a backlight panel body 11; and a baffle plate 12, wherein the baffle plate 12 is enclosed around the outer periphery of the backlight panel body 11 to form the cavity, and the limiter 20 is formed by extending from the baffle plate 12 toward the cavity.

[0040] The baffle plate 12 can be an integrated baffle plate 12 or an assembled baffle plate 12. Taking the assembled baffle plate 12 as an example below, it includes: a first baffle plate 121, which is enclosed around the outer periphery of the backlight panel body 11 to form the cavity; and a second baffle plate 122, which is arranged on the side of the first baffle plate 121 away from the backlight panel body 11, and a buckle 123 is provided on the side of the second baffle plate 122 facing the backlight panel body 11, and the buckle 123 and the first baffle plate 121 are detachably connected, and the limit member 20 is connected to the matching position of the buckle 123 and the first baffle plate 121.

[0041] The assembled baffle plate 12 has a first baffle plate 121 and a second baffle plate 122 arranged in a vertical direction. The second baffle plate 122 has a buckle 123 punched outward, and the buckle 123 is buckled and connected to the first baffle plate 121. When buckled, there must be a gap between the buckle 123 and the first baffle plate 121, and the gap will affect the airtightness inside the backlight module 100. In order to optimize the airtightness inside the module, the gap between the buckle 123 and the first baffle plate 121 can be filled by gluing; or, the limit member 20 can be set at the connection between the buckle 123 and the first baffle plate 121, and the gap can be filled while fixing the limit member 20, so that the airtightness of the backlight module 100 is stronger, and the product's ability to withstand high temperature and high humidity environments is improved.

[0042] When the first enclosure plate 121 and the second enclosure plate 122 are aligned in the vertical direction, the stopper 20 is arranged to fit the connection between the inner wall of the buckle 123 and the inner wall of the first enclosure plate 121, so that the gap between the buckle 123 and the first enclosure plate 121 is sealed by the stopper 20, so that the airtightness of the backlight module 100 is stronger. Specifically, the stopper 20 is fixed to the connection between the inner wall of the buckle 123 and the inner wall of the first enclosure plate 121 by double-sided tape, so that the stopper 20 is firmly fixed to the connection between the inner wall of the buckle 123 and the inner wall of the first enclosure plate 121, and the bonding makes the airtightness of the backlight module 100 stronger.

[0043] As an example, the material of the limiter 20 is a thermoplastic variable elastic plastic material with buffering properties, specifically expanded polypropylene (EPP), expanded polyethylene (EPE), expanded polystyrene (EPS) or TPU / TPE, etc. The material of the limiter 20 is not limited here. The limiter 20 made of a material with buffering properties can limit the expansion of the light guide plate 30 during assembly and use and protect the light guide plate 30 from damage.

[0044] The light guide plate 30 is made of optical grade acrylic / PC sheet, and then a high-tech material with extremely high refractive index and no light absorption is used. The light guide points are printed on the bottom of the optical grade acrylic sheet by laser engraving, V-shaped cross grid engraving, and UV screen printing technology to evenly diffuse the light emitted by the light strip.

[0045] The light bar includes a circuit board and a plurality of light-emitting elements arranged on the circuit board, wherein the light-emitting element can be a conventional-sized light-emitting diode (LED), or can be any one of a micro-light-emitting diode (Micro-LED) or a submillimeter light-emitting diode (Mini-LED). Micro-LED refers to an LED chip with a grain size of less than 100μm, and Mini-LED refers to an LED chip with a grain size of 100-300μm. LED, Mini-LED or Micro-LED can be used as a self-luminous light-emitting element display, with the advantages of low power consumption, high brightness, high resolution, high color saturation, fast response speed, long life, and high efficiency.

[0046] In other embodiments, the reflective sheet 40 can specifically be reflective paper. In the edge-entry backlight module 100, a whole layer of reflective paper is pasted under the light guide plate 30. Since the light bar emits the light source to the light guide plate 30, the light is deflected by the light guide plate 30, and part of the light is diverged toward the display panel, and part of the light enters the reflective paper. The reflective paper reflects part of the absorbed light back to the light guide plate 30, which is then emitted through the display panel, thereby improving the light output rate.

[0047] In addition, the material of the backlight plate 10 can be a metal material, such as any one of an aluminum plate, an aluminum alloy plate, or a galvanized steel, and is made by processes such as stamping. The metal material has good ductility and can protect the backlight module 100 from being easily broken under the impact of external forces. The material of the backlight plate 10 can also be a plastic material, such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene, etc., to reduce the weight of the backlight module 100 and reduce the cost of the backlight module 100. The shape of the backlight plate 10 can be the same as the shape of the display panel using the backlight module 100. For example, when the shape of the display panel is rectangular, the shape of the backlight plate 10 of the backlight module 100 used is also rectangular. The shape of the backlight plate 10 can change with different embodiments.

[0048] Second embodiment

[0049] See also Figure 2As shown, the backlight module 100 of this embodiment is the same as the first embodiment, except that: the position-limiting member 20 adopts a closed-loop design, which includes: a third position-limiting portion 23, the third position-limiting portion 23 is connected between the first position-limiting portion 21 and the second position-limiting portion 22, and the third position-limiting portion 23 is straight, so that the position-limiting member 20 forms a closed triangular frame. Due to the closed-loop structure, the position-limiting member 20 has stronger resilience compared with the open position-limiting member 20 of the first embodiment, and can disperse the deformation stress of the light guide plate 30 through the upper and lower corners of the first position-limiting portion 21, so that the force and deformation are uniform and the rebound effect is good.

[0050] Third embodiment

[0051] See also Figure 3 As shown, the backlight module 100 of this embodiment is the same as the second embodiment, except that: the limiting member 20 includes: a first limiting portion 21, the first limiting portion 21 is arranged on the side wall of the backlight plate 10, and the first limiting portion 21 is straight; and a fourth limiting portion 24, the two ends of the fourth limiting portion 24 are respectively connected to the two ends of the first limiting portion 21, the fourth limiting portion 24 is arc-shaped, and the fourth limiting portion 24 protrudes toward the direction of the light guide plate 30, so that the limiting member 20 is a closed semicircular frame. Since the limiting member 20 adopts a closed-loop structure of a semicircular frame, compared with the closed-loop structure of the triangular frame of the second embodiment, the arc-shaped fourth limiting portion 24 has a smooth transition, and the deformation stress distribution at the upper and lower corners of the first limiting portion 21 is more uniform, and the rebound effect is good.

[0052] Fourth embodiment

[0053] See also Figure 4 As shown, on the basis of any of the above embodiments, the first baffle plate 121 and the second baffle plate 122 are staggered in the vertical direction, the first baffle plate 121 is located on the inner side of the second baffle plate 122, and there is a gap between the buckle 123 and the first baffle plate 121, and the limit member 20 is snapped into the gap between the buckle 123 and the first baffle plate 121. The above staggered arrangement reserves space for the installation of the limit member 20, and one side of the limit member 20 abuts against the inner wall of the second baffle plate 122, and the other side abuts against the outer wall of the first baffle plate 121, thereby achieving strong air tightness.

[0054] Compared with any of the foregoing embodiments, the limiting member 20 can be directly snapped into the gap between the buckle 123 and the first enclosure plate 121, thereby realizing automated assembly, saving the assembly process, and directly assembling the backlight panel 10 and the limiting member 20 without the need for gluing or other structural coordination to achieve installation.

[0055] Fifth embodiment

[0056] See also Figure 5 As shown, based on the first embodiment, this embodiment provides a display device, including: a display panel 200; and the backlight module 100 described in the first embodiment, the backlight module 100 is arranged on the backlight side of the display panel 200, and the backlight module 100 is used to provide light source to the display panel 200.

[0057] The display panel 200 may be a liquid crystal display panel 200 , and the periphery of the liquid crystal display panel 200 may be directly adhered to the backlight module 100 using foam adhesive, the foam adhesive is a double-sided adhesive, and the material of the liquid crystal display panel 200 is liquid crystal glass.

[0058] Specifically, the liquid crystal display panel 200 includes an array substrate 201 , a color filter substrate 202 , and a liquid crystal layer 203 located between the array substrate 201 and the color filter substrate 202 , wherein the backlight module 100 is disposed on the backlight side of the array substrate 201 .

[0059] The liquid crystal display panel 200 may be a single liquid crystal display panel 200, or may be a double liquid crystal display panel 200 stacked in the thickness direction. When the liquid crystal display panel 200 is a double liquid crystal display panel 200, the liquid crystal display panel 200 at the bottom layer is used for light control, and the liquid crystal display panel 200 at the top layer is used for display, and such a configuration can improve the contrast of the display device.

[0060] It is understandable that the technical solution of the backlight module 100 provided in each embodiment of the present application can be widely used to provide light sources to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel. It should be easily understood that the "on...", "above..." and "on..." in the present application should be interpreted in the broadest way, so that "on..." not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above..." or "on..." not only includes the meaning of "above something" or "on", but also includes the meaning of "above something" or "on" with no intermediate features or layers therebetween (i.e., directly on something).

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, comprising a backlight panel, a light bar and a light guide plate, wherein a cavity is formed in the backlight panel, the light bar and the light guide plate are arranged in the cavity, and the light bar is located on one side of the light guide plate, and the inner wall of the backlight panel extends toward the cavity to form at least one stopper, and the stopper and the light bar are respectively located on different sides of the light guide plate, characterized in that: The limiting member is made of elastic material. In a naturally stretched state, the orthographic projection of the limiting member on the backlight panel along the direction away from the light emitting direction is a first projection, and the orthographic projection of the installation position of the light guide plate on the backlight panel along the direction away from the light emitting direction is a second projection, and the first projection and the second projection overlap each other; The limiting member is provided with a reflective layer on one side facing the cavity; The limiting member comprises: A first limiting portion, wherein the first limiting portion is disposed on a side wall of the backlight plate and is straight; and A second limiting portion, wherein the second limiting portion is connected to the first limiting portion at an angle, the second limiting portion is straight, the second limiting portion is bent and extends toward the light guide plate, and a roller structure is provided at a portion where the second limiting portion contacts the light guide plate; The backlight panel comprises: a backlight panel body and a baffle plate, wherein the baffle plate is enclosed at the periphery of the backlight panel body to form the cavity, and the stopper is formed by extending from the baffle plate toward the cavity; The enclosure plate comprises: A first enclosing plate, the first enclosing plate is enclosed around the outer periphery of the backlight plate body to form the cavity; and A second enclosure plate, the second enclosure plate is arranged on a side of the first enclosure plate away from the backlight plate body, a buckle is arranged on a side of the second enclosure plate facing the backlight plate body, the buckle and the first enclosure plate are detachably connected, and the limiter is connected to the matching position of the buckle and the first enclosure plate; The first enclosure plate and the second enclosure plate are staggered in the vertical direction, the first enclosure plate is located inside the second enclosure plate, and there is a gap between the buckle and the first enclosure plate, and the limiting member is clamped in the gap between the buckle and the first enclosure plate; Alternatively, the first enclosure plate and the second enclosure plate are aligned in the vertical direction, and the limiting member is arranged in contact with the connection between the buckle inner wall and the first enclosure plate inner wall.

2. A backlight module, comprising a backlight panel, a light bar and a light guide plate, wherein a cavity is formed in the backlight panel, the light bar and the light guide plate are arranged in the cavity, and the light bar is located on one side of the light guide plate, and the inner wall of the backlight panel extends toward the cavity to form at least one stopper, and the stopper and the light bar are respectively located on different sides of the light guide plate, characterized in that: The limiting member is made of elastic material. In a naturally stretched state, the orthographic projection of the limiting member on the backlight panel along the direction away from the light emitting direction is a first projection, and the orthographic projection of the installation position of the light guide plate on the backlight panel along the direction away from the light emitting direction is a second projection, and the first projection and the second projection overlap each other; The limiting member is provided with a reflective layer on one side facing the cavity; The limiting member comprises: A first limiting portion, wherein the first limiting portion is disposed on a side wall of the backlight plate and is straight; A second limiting portion, the second limiting portion is connected to the first limiting portion at an angle, the second limiting portion is straight, the second limiting portion is bent and extends toward the light guide plate, and a roller structure is provided at a portion where the second limiting portion contacts the light guide plate; and A third limiting portion, the third limiting portion is connected between the first limiting portion and the second limiting portion, the third limiting portion is straight, so that the limiting member forms a closed triangular frame; The backlight panel comprises: a backlight panel body and a baffle plate, wherein the baffle plate is enclosed at the periphery of the backlight panel body to form the cavity, and the stopper is formed by extending from the baffle plate toward the cavity; The enclosure plate comprises: A first enclosing plate, the first enclosing plate is enclosed around the outer periphery of the backlight plate body to form the cavity; and A second enclosure plate, the second enclosure plate is arranged on a side of the first enclosure plate away from the backlight plate body, a buckle is arranged on a side of the second enclosure plate facing the backlight plate body, the buckle and the first enclosure plate are detachably connected, and the limiter is connected to the matching position of the buckle and the first enclosure plate; The first enclosure plate and the second enclosure plate are aligned in the vertical direction, and the limiting member is arranged in contact with the connection between the buckle inner wall and the first enclosure plate inner wall.

3. The backlight module according to claim 1 or 2, characterized in that: The size of the overlapping portion between the first projection and the second projection is 0.1 mm.

4. A display device, characterized in that: include: Display panel; as well as The backlight module according to any one of claims 1 to 3, wherein the backlight module is arranged on the backlight side of the display panel, and the backlight module is used to provide a light source to the display panel.

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