Backlight module, display module and display device

Abstract

The invention relates to the technical field of display devices, and discloses a backlight module, a display module and a display device. The backlight module comprises a back plate, the back plate comprises a bottom plate and a plurality of side plates connected to the bottom plate, and the side plates are sequentially connected end to end to form a containing space. The light bar, the light guide plate and the adapter are located in the containing space. The adapter piece comprises a first adapter plate, and the first adapter plate is located between the light guide plate and the bottom plate. The light guide plate is fixed to the side, away from the bottom plate, of the first adapter plate. The light bar is located between the light guide plate and the side plate and fixedly connected to the first adapter plate. According to the backlight module disclosed by the invention, the volatility of the display brightness of the display module can be reduced, and the uniformity of the display brightness is improved.

Description

Technical Field

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

[0002] With the rapid development of smart IoT, liquid crystal display devices have been introduced in many outdoor or semi-outdoor environments such as gas stations, subway stations, airports, etc. This special environment puts higher requirements on display devices. For example, in the case of high ambient light brightness under direct or oblique sunlight, in order to improve the brightness level of the display device itself to improve the display effect, current display devices usually adopt a double-sided light bar light input side-entry design to ensure brightness.

[0003] The design of double-sided light bar side-entry usually means that the light bar is fixed to the back panel, and sufficient expansion space is reserved between the light bar and the light guide plate to ensure the expansion of the light guide plate. As for the limit of the movement of the light guide plate, rubber strips are usually set at the four corners of the back panel or the non-light bar layer back panel is bent to limit the movement of the light guide plate. However, due to the manufacturing tolerances of the back panel and the light guide plate, the initial design gap between the light guide plate and the light bar will fluctuate in different production batches, resulting in large differences in the display brightness of different batches of display devices. In addition, when a rubber strip is used to limit the light guide plate, the light guide plate will be compressed to a certain extent due to its own weight or vibration when placed vertically, and the gap between the light guide plate and the light bar changes, which also causes large fluctuations in the brightness uniformity of the display device. Summary of the invention

[0004] The present application provides a backlight module, a display module and a display device, which are used to reduce the fluctuation of display brightness of the display module and improve the uniformity of display brightness.

[0005] In a first aspect, the present application provides a backlight module, comprising:

[0006] A back plate, the back plate comprising a bottom plate and a plurality of side plates connected to the bottom plate, wherein the plurality of side plates are sequentially connected end to end to form an accommodating space;

[0007] A light bar, a light guide plate and an adapter located in the accommodating space;

[0008] The adapter comprises a first adapter plate, and the first adapter plate is located between the light guide plate and the bottom plate;

[0009] The light guide plate is fixed to a side of the first adapter plate facing away from the bottom plate;

[0010] The light bar is located between the light guide plate and the side plate, and the light bar is fixedly connected to the first adapter plate.

[0011] The backlight module provided in the present application is provided with an adapter in the back panel, the adapter includes a first adapter plate, and the light bar and the light guide plate are fixedly connected to the first adapter, so that the light bar and the light guide plate are relatively fixed, and no relative displacement occurs between the two. When the light guide plate moves in the back panel, the gap between the light guide plate and the light bar is fixed, thereby greatly reducing the volatility of the gap between the light guide plate and the light bar, improving the uniformity of the display brightness, and the display picture will not fluctuate, thereby improving the display effect. In addition, compared with the traditional backlight module in which the light bar is fixed to the back panel, the light bar and the light guide plate in the present application are both fixed to the first adapter, which can also avoid the fluctuation of the initial design gap between the light guide plate and the light bar caused by the manufacturing tolerance caused by different batches, thereby improving the uniformity of the display brightness.

[0012] In some possible implementations, a first connecting member is further included, the first connecting member includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is located between the first adapter portion and the bottom plate, and the second connecting portion is located between the light bar and the side plate;

[0013] The first adapter plate is fixed to a side of the first connecting portion facing away from the bottom plate;

[0014] The light bar is fixed to a side of the second connecting portion facing the light guide plate.

[0015] In some possible implementations, an elastic clip is further included, and the elastic clip is used to clamp the first adapter plate and the first connecting portion;

[0016] The elastic clip includes a first clip and a second clip arranged opposite to each other and a third clip connecting the first clip and the second clip, the first clip is located on a side of the first adapter plate away from the bottom plate, the second clip is located on a side of the first connecting portion close to the bottom plate, and the third clip is located between the first clip and the second clip.

[0017] In some possible implementation schemes, the first clip and the second clip are made of thin metal, and / or the thickness of the first clip and the second clip is 0.15 mm to 0.25 mm.

[0018] In some possible implementations, the first adapter plate is provided with a first hole, the first connecting portion is provided with a first column, the first column is passed through the first hole, the size of the first hole along the first direction is the same as the size of the first hole along the second direction, the first direction is the length direction of the light bar, and the second direction is the arrangement direction of the light bar and the light guide plate.

[0019] In some possible implementations, along the first direction, the first adapter plate is provided with at least one second hole on both sides of the first hole, and the first connecting portion is further provided with second columns corresponding to the second holes one by one, and the second columns are inserted into the corresponding second holes;

[0020] A size of the second hole along the first direction is greater than a size of the first hole along the first direction, and a size of the second hole along the first direction is the same as a size of the first hole along the first direction.

[0021] In some possible implementation schemes, the first connecting member is made of metal.

[0022] In some possible implementations, the adapter further includes a second adapter plate connected to the first adapter plate, the second adapter plate is located between the side plate and the light bar, and is connected to a side of the first adapter plate facing the side plate;

[0023] The light bar is fixed to a side of the second adapter plate facing the light guide plate.

[0024] In some possible implementation schemes, the material of the second adapter plate is metal.

[0025] In some possible implementation schemes, a heat dissipation clip is further included, and the heat dissipation clip includes a first heat dissipation plate, the first heat dissipation plate is located between the light bar and the second adapter plate, and the first heat dissipation plate is fixed to the light bar.

[0026] In some possible implementations, the heat dissipation clip further includes a second heat dissipation plate connected to the first heat dissipation plate, and the second heat dissipation plate is fixed to a side of the second adapter plate away from the bottom plate; or

[0027] The heat dissipation clip further includes a second heat dissipation plate and a third heat dissipation plate, the second heat dissipation plate is connected between the first heat dissipation plate and the third heat dissipation plate, the second heat dissipation plate is fixed to a side of the second adapter plate away from the bottom plate, and the third heat dissipation plate is fixed to a side of the second adapter plate away from the light bar; or

[0028] The heat dissipation clip also includes a second heat dissipation plate, a third heat dissipation plate and a fourth heat dissipation plate connected in sequence, the second heat dissipation plate is connected to the first heat dissipation plate, the second heat dissipation plate is fixed to a side of the second adapter plate away from the bottom plate, the third heat dissipation plate is fixed to a side of the second adapter plate away from the light strip, the fourth heat dissipation plate is fixed to the bottom plate, and there is a gap between the fourth heat dissipation plate and the side plate.

[0029] In some possible implementations, the adapter further includes a first limiting structure connected to the first adapter plate, the first limiting structure is located on a side of the second adapter plate facing the side plate, the bottom plate is provided with a second limiting structure, and the first limiting structure and the second limiting structure cooperate to limit the bottom plate and the adapter;

[0030] When the heat dissipation clip includes a third heat dissipation plate, the heat dissipation plate is provided with an avoidance groove for avoiding the first limiting structure and the second limiting structure.

[0031] In some possible implementations, the adapter includes a first connector connected to the first adapter plate, the light bar includes a second connector, the second connector is located on a side away from the light guide plate, and the first connector is snap-connected with the second connector.

[0032] In some possible implementations, the light strip includes a carrier plate and a connecting plate connected to each other, the carrier plate is located between the light guide plate and the side plate, the connecting plate is located between the light guide plate and the bottom plate, and the first adapter plate and the connecting plate are an integrally formed structure.

[0033] In some possible embodiments, the light strip includes a carrier plate and a connecting plate connected to each other, the carrier plate is located between the light guide plate and the side plate, the connecting plate is located between the light guide plate and the bottom plate, and the first adapter plate is located on a side of the connecting plate away from the bottom plate.

[0034] In some possible implementation schemes, a sink is provided on one side of the first adapter plate facing the connecting plate, the connecting plate is provided with a avoidance groove, and the sink is located in the avoidance groove.

[0035] In some possible implementations, the adapter further includes at least one protrusion connected to the first adapter plate, the protrusion is located between the side plate and the light bar, and the protrusion has a first groove on a side facing the side plate;

[0036] The bottom plate is provided with a third column, and the third column is passed through the first groove.

[0037] In some possible implementations, the adapter further includes a second adapter plate connected to the first adapter plate, and the second adapter plate is located between the light bar and the side plate;

[0038] The protrusion is fixed to a side of the second adapter plate facing the side plate; or

[0039] The protrusion is fixed to a side of the first adapter plate facing the side plate, and the second adapter plate is provided with an avoidance structure for avoiding the protrusion.

[0040] In some possible implementations, the bottom plate is provided with a fourth column, the first adapter plate is provided with a third hole, the size of the third hole along the second direction is larger than the size of the third hole along the first direction, and the fourth column is inserted into the third hole;

[0041] The first direction is the length direction of the light bar, and the second direction is the arrangement direction of the light bar and the light guide plate.

[0042] In some possible implementations, the ratio of the expansion coefficient of the first adapter plate to the expansion coefficient of the light guide plate is 0.9 to 1.1.

[0043] In some possible implementations, the back panel includes a first side panel and a second side panel connected to each other, the light bar is provided between the first side panel and the light guide plate, and the light bar is not provided between the second side panel and the light guide plate;

[0044] The second side plate is provided with a second groove along the third direction, and at least one limiting portion is provided between the second groove and the light guide plate;

[0045] At least two first bosses are provided on one side of the light guide plate facing the second side plate, the at least two first bosses are arranged along the second direction, a third groove is formed between two adjacent first bosses, and the limiting portion is penetrated through the third groove;

[0046] The second direction is an arrangement direction of the light guide plate and the light bar, and the third direction is a thickness direction of the light guide plate.

[0047] In some possible implementation schemes, an opening direction of the second groove is not parallel to an opening direction of the third groove.

[0048] In some possible embodiments, the limiting portion has a first surface on a side away from the base plate, the light guide plate has a first board surface on a side away from the base plate, and the dimension between the first board surface and the base plate along the third direction is less than or equal to the dimension between the first surface and the base plate along the third direction away from the first surface.

[0049] In some possible implementations, an optical film is further included, and the optical film is located on a side of the light guide plate away from the bottom plate;

[0050] The at least one limiting portion includes a first limiting portion, the first limiting portion is provided with a fourth groove along the third direction, the fourth groove is provided with an ear hanging rib, the optical film includes a second boss, the second boss is provided with an ear hanging hole, the second boss is located in the fourth groove, and the ear hanging rib is passed through the ear hanging hole; and / or

[0051] The at least one limiting portion includes a second limiting portion, the second limiting portion is provided with a fifth groove along the third direction, and the optical film includes a third boss, and the third boss is located in the fifth groove.

[0052] In some possible implementations, an adhesive layer is further included, wherein the adhesive layer is located between the light guide plate and the first adapter plate, and the light guide plate is fixed to a side of the first adapter plate facing away from the bottom plate through the adhesive layer.

[0053] In some possible implementations, a reflective sheet is further included, and the reflective sheet is located between the light guide plate and the bottom plate;

[0054] The bonding layer comprises a first bonding portion and a second bonding portion which are connected to each other, the first bonding portion is bonded to the reflective sheet, the second bonding portion is bonded to the light guide plate, the second bonding portion is located between the first bonding portion and the light bar, the orthographic projection of the first bonding portion on the side panel at least partially overlaps with the orthographic projection of the second bonding portion on the side panel, and the size of the first bonding portion in the third direction is smaller than the size of the second bonding portion in the third direction; or,

[0055] The adhesive layer comprises a first adhesive portion and a second adhesive portion which are connected to each other, the first adhesive portion is arranged on a side of the first adapter away from the bottom plate, the reflective sheet is adhered to the first adhesive portion, the second adhesive portion is arranged on a side of the first adhesive portion away from the first adapter, the light guide plate is adhered to the second adhesive portion, an orthographic projection of the first adhesive portion on the bottom plate and an orthographic projection of the second adhesive portion on the bottom plate at least partially overlap, and a size of the first adhesive layer in the second direction is larger than a size of the second adhesive layer in the second direction;

[0056] The second direction is an arrangement direction of the light guide plate and the light bar, and the third direction is a thickness direction of the light guide plate.

[0057] In some possible implementation schemes, the light bar includes a carrier plate, a plurality of lamp beads and at least one stop block, the lamp beads and the stop block are fixed to a side of the carrier plate facing the light guide plate, the plurality of lamp beads are arranged at intervals, and the stop block is located between adjacent lamp beads;

[0058] The height of the limit block protruding from the carrier plate is greater than the height of the lamp beads protruding from the carrier plate, and the light guide plate abuts against the limit block.

[0059] In some possible implementations, the light bar further includes a connector, and the connector is fixed to a side of the carrier board facing the light guide plate;

[0060] The connector has a socket, and the bottom plate is provided with an opening facing the socket;

[0061] The plane where the socket is located is the end surface, the plane where the outer surface of the bottom plate is located is the outer surface plane, the light guide plate has a second plate surface on the side facing the bottom plate, and the end surface is located between the outer surface plane and the second plate surface;

[0062] The distance between the end surface and the second plate surface in the third direction is less than or equal to the distance between the outer surface plane and the second plate surface in the third direction;

[0063] Wherein, the third direction is the thickness direction of the light guide plate.

[0064] In a second aspect, the present application provides a display module, comprising a backlight module as described in any possible implementation scheme of the first aspect.

[0065] In a third aspect, the present application provides a display module, comprising the display module as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a schematic diagram of an exploded structure of the backlight module in this application;

[0067] Figure 2 A schematic diagram of a structure of assembling the adapter, light bar and light guide plate in this application;

[0068] Figure 3 A schematic diagram of a structure in which a light bar and an adapter are connected in this application;

[0069] Figure 4 A schematic diagram of a structure of assembling a transfer member, a light bar and a first connecting member in the present application;

[0070] Figure 5 It is another structural schematic diagram of the assembly of the adapter, the light bar and the first connecting member in the present application;

[0071] Figure 6 It is another structural schematic diagram of the assembly of the adapter, the light bar and the first connecting member in the present application;

[0072] Figure 7 A cross-sectional view of the backlight module in this application;

[0073] Figure 8 is another cross-sectional view of the backlight module in this application;

[0074] Fig. 9 is another cross-sectional view of the backlight module in this application;

[0075] Fig.10It is a structural schematic diagram of the first adapter plate and the first connecting member in this application;

[0076] Fig.11 for Fig.10 A magnified schematic diagram of the structure at center A;

[0077] Fig.12 A schematic diagram of the structure of the elastic clip in this application;

[0078] Fig.13 for Fig.10 A magnified schematic diagram of the structure at B in the middle;

[0079] Fig.14 for Fig.10 A magnified schematic diagram of the structure at C in the middle;

[0080] Fig.15 A schematic diagram of a structure for limiting the position between the first adapter and the back plate in the present application;

[0081] Fig.16 for Fig.15 A top view of the structure shown in;

[0082] Fig.17 It is another structural schematic diagram of the position limiting between the first adapter and the back plate in the present application;

[0083] Fig.18 is another cross-sectional view of the backlight module in this application;

[0084] Fig.19 for Fig.18 A top view of the adapter shown in ;

[0085] Figure 20a-20d They are schematic diagrams of different structures of heat dissipation clips provided in the backlight module;

[0086] Fig.21 for Fig.20d A schematic diagram of a structure of a heat dissipation clip;

[0087] Fig. 22 for Fig.21 A schematic diagram of a portion of the structure of the heat dissipation clip;

[0088] Fig.23 This is a schematic diagram of the overall structure of the backplane in this application;

[0089] Fig.24 for Fig.23 A magnified schematic diagram of the structure at D in the middle;

[0090] Fig.25 A schematic diagram of the overall structure of the light guide plate in this application;

[0091] Fig.26 A schematic diagram of a structure of assembling a light guide plate and a back plate in this application;

[0092] Fig. 27 for Fig.26 A magnified schematic diagram of the structure at E in the middle;

[0093] Fig.28 A schematic diagram of the overall structure of the optical film in this application;

[0094] Fig.29 for Fig.28 A magnified schematic diagram of the structure at F in the middle;

[0095] Fig.30 for Fig.26 A magnified schematic diagram of the structure at G in the middle;

[0096] Fig.31 A schematic diagram of a structure of assembling an optical film and a back plate in this application;

[0097] Fig.32 for Fig.31 A magnified schematic diagram of the structure at H in the middle;

[0098] Fig.33 for Fig.31 A magnified schematic diagram of the structure at J in the middle;

[0099] Fig.34 This is a schematic diagram of the overall structure of the light bar in this application;

[0100] Fig.35 A schematic diagram of the structure after the light bar and the light guide plate are assembled in this application;

[0101] Fig.36 This is a schematic diagram of a structure of the back side of the bottom plate facing the light bar connector in this application;

[0102] Fig.37 This is another overall structural diagram of the light bar in this application;

[0103] Fig.38 The first adapter board and Fig.37 A structural schematic diagram of the light bar assembly in FIG.

[0104] Fig.39 A schematic diagram of a structure of the assembly of a light bar and a light guide plate in this application;

[0105] Fig.40 This is a structural schematic diagram of one corner of the backlight module in this application.

[0106] In the figure:

[0107] 100-back plate; 110-bottom plate; 110a-outer surface; 111-third column; 112-fourth column; 113-opening; 120-side plate; 120a-first side plate; 120b-second side plate; 121-second groove; 130-limiting part; 130a-first limiting part; 130b-second limiting part; 1301-first surface; 1311-fourth groove; 1312-ear hanging bar; 1313-fifth groove ; 200-light bar; 201-second connector; 210-carrier; 220-lamp beads; 230-limiting block; 240-connector; 241-socket; 250-connecting plate; 251-avoidance groove; 300-light guide plate; 300a-first surface; 301-first avoidance surface; 302-second avoidance surface; 310-first boss; 320-third groove; 400-adapter; 401-first connector; 410 -first adapter plate; 411-adhesive layer; 4111-first adhesive portion; 4112-second adhesive portion; 413-first hole; 414-second hole; 415-raised portion; 416-first groove; 417-third hole; 418-sunk platform; 420 second adapter plate; 500-first connecting member; 510-first connecting portion; 511-first column; 512-second column; 520-second connecting portion; 521-avoidance hole; 600-reflector; 700-elastic clip; 710-first clip; 720-second clip; 730-third clip; 800-optical film; 810-second boss; 820-ear hole; 830-third boss; 900 heat dissipation clip; 910-first heat dissipation plate; 920-second heat dissipation plate; 930-third heat dissipation plate; 940-fourth heat dissipation plate; 950-first avoidance groove; 1000-L-shaped rubber strip. DETAILED DESCRIPTION

[0108] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0109] refer to Figure 1 The display module in the present application may include a back panel 100, a light bar 200, a light guide plate 300 and an adapter 400. The back panel 100 includes a bottom panel 110 and a plurality of side panels 120 connected to the bottom panel 110, and the plurality of side panels 120 are sequentially connected end to end to form a receiving space in cooperation with the bottom panel 110. The light bar 200, the light guide plate 300 and the adapter 400 are all disposed in the receiving space.

[0110] The bottom plate 110 in the present application can be a square structure, and the number of side plates 120 is four. In addition, the display module in the present application can be applied to a single light bar 200 light-entry side design or a double light bar 200 light-entry side design. When applied to a double light bar 200 light-entry side design, at this time, the two light bars 200 are respectively arranged near a group of two opposite side plates 120, the light guide plate 300 is located between the two light bars 200, and the number of adapters 400 is the same as the number of light bars 200. In order to facilitate the detailed description of the display module scheme in the present application, the following embodiments are described with the light bar 200 on one side and the related structure. In addition, in the following embodiments, the length direction of the light bar 200 is defined as the first direction, that is, the X direction, the arrangement direction of the light bar 200 and the light guide plate 300 is defined as the second direction, that is, the Y direction, and the thickness direction of the light guide plate 300 is defined as the third direction, that is, the Z direction.

[0111] For reference Figure 1 and Figure 2 The adapter 400 may include a first adapter plate 410 , which is located between the light guide plate 300 and the bottom plate 110 , and the light guide plate 300 and the light bar 200 are both fixed to a side of the first adapter plate 410 away from the bottom plate 110 .

[0112] It can be understood that the display module in the present application is provided with a first adapter plate 410, and the light guide plate 300 and the light bar 200 are fixed on the first adapter plate 410, which can ensure that the light guide plate 300 and the light bar 200 are relatively fixed. When the light guide plate 300 is displaced relative to the back plate 100, the gap between the light guide plate 300 and the light bar 200 will not fluctuate, thereby reducing the volatility of the display brightness of the display module and improving the brightness uniformity of the display module. In addition, compared with the technical solution of fixing the light bar 200 to the back plate 100 in the display module in the reference group, the light bar 200 is fixed to the first adapter plate 410 in the present application, which can avoid the fluctuation of the design gap between the light guide plate 300 and the light bar 200 caused by the manufacturing tolerance of the back plate 100 and the light guide plate 300 in different production batches, thereby improving the brightness uniformity of the display module.

[0113] refer to Figure 3, the adapter 400 may also include a first connector 401 connected to the first adapter plate 410, the light bar 200 includes a second connector 201 connected to the side of the light bar 200 away from the light guide plate 300, and the first connector 430 and the second connector 201 are snap-connected. At this time, the first adapter plate 410 and the light bar 200 are relatively fixed through the first connector 401 and the second connector 201 to improve the fixing effect between the first adapter plate 410 and the light bar 200. Exemplarily, the first connector 401 may be a slot provided on the first adapter plate 410, the opening of the slot faces the side plate 120, and the second connector 201 may be a T-shaped connector fixed to the light bar 200, and the T-shaped connector is snap-connected in the slot, thereby achieving the fixing of the light bar 200 and the first adapter plate 410.

[0114] In some embodiments, reference Figure 4 The display module in the present application further includes a first connector 500, which may include a first connector 510, the first connector 510 is located between the first adapter plate 410 and the bottom plate 110, and the first adapter plate 410 is connected to the first connector 510. In the present application, the first connector 510 may be used to support the overall structure of the first adapter plate 410, the light guide plate 300 and the light bar 200, so that the overall structure is more stable, and the thickness of the first connector 510 may be adjusted to meet the height required by the light guide plate 300.

[0115] The side of the first connection portion 510 facing the side plate 120 may be flush with the side of the first adapter plate 410 facing the side plate 120, or the side of the first connection portion 510 facing the side plate 120 may protrude from the side of the first adapter plate 410 facing the side plate 120. Figure 3 As shown in , when the first adapter plate 410 and the light bar 200 are fixed by the first connector 401 and the second connector 201, based on this, the first adapter plate 410 can be fixed on the first connection part 510, and the first connector 401 can be arranged at the position where the first connection part 510 protrudes from the first adapter plate 410, and is located on the side of the first connection part 510 away from the bottom plate 110. The second connector 201 is fixed to the side of the light bar 200 away from the light guide plate 300. At this time, after the first connector 401 and the second connector 201 are engaged, the first adapter plate 410, the first connection part 510, the light guide plate 300 and the light bar 200 can form a relatively fixed integral structure.

[0116] In some embodiments, reference Figure 5The backlight module in the present application further includes a first connector 500, and the first connector 500 may include a second connector 520, and the second connector 520 is fixed to the side of the light bar 200 away from the light guide plate 300. Since the second connector 520 and the light bar 200 are relatively fixed, the structural strength of the light bar 200 can be improved, thereby improving the fixing effect between the light bar 200 and the first adapter plate 410. It is worth noting that a certain gap is maintained between the second connector 520 and the side plate 120, so that when the light guide plate 300 expands, a certain expansion gap is left for the light guide plate 300.

[0117] In the present application, the surface of the second connection part 520 facing the bottom plate 110 can be in contact with the surface of the bottom plate 110. In this case, the second connection part 520 can be made of a material with good thermal conductivity. For example, the material of the second connection part 520 is metal. When the light bar 200 generates heat, the heat of the light bar 200 can be transferred to the second connection part 520, and then transferred to the bottom plate 110 by the second connection part 520, so as to improve the heat dissipation effect of the light bar 200.

[0118] In some embodiments, reference Figure 6 The backlight module in the present application also includes a first connector 500, which includes a first connector 510 and a second connector 520. The first connector 510 is fixedly connected to the second connector 520, and the first connector 510 is perpendicular to the second connector 520. At this time, the first connector 500 is an L-shaped structure as a whole. The first connector 510 is located between the first adapter plate 410 and the bottom plate 110, and the first adapter plate 410 is connected to the side of the first adapter away from the bottom plate 110. The light bar 200 can also be glued to the side of the second connector 520 facing the light guide plate 300.

[0119] The first connection part 510 and the second connection part 520 may be an integrated structure, so as to ensure the overall structural stability of the first connection member 500. In this way, when the light bar 200 and the first adapter plate 410 are both arranged on the first connection member 500, the first adapter member 400 can not only support the light bar 200, the first adapter plate 410 and the light guide plate 300, so as to improve the structural stability among the first adapter plate 410, the light bar 200 and the light guide plate 300, and thus enhance the relative fixing effect between the light bar 200 and the light guide plate 300.

[0120] In the present application, the material of the first connecting member 500 can be metal, and the light bar 200 can be attached to the second connecting portion 520 by means of a heat-conducting adhesive. At this time, the first connecting member 500 has good thermal conductivity, and the heat generated by the light bar 200 can be first transferred to the second connecting portion 520, then transferred from the second connecting portion 520 to the first connecting portion 510, and finally transferred from the first connecting portion 510 to the bottom plate 110, and finally the heat is dissipated outside the back plate 100. Since the contact area between the second connecting portion 520 and the bottom plate 110 is large, by making the first connecting member 500 also serve as a heat sink, the heat dissipation efficiency of the backlight module can be improved, which is conducive to reducing the temperature of the back plate 100.

[0121] Further, refer to Figure 7 A bonding layer 411 is provided on the side of the first adapter plate 410 facing away from the bottom plate 110 , and the light guide plate 300 is bonded to the bonding layer 411 , so that the light guide plate 300 and the first adapter plate 410 are relatively fixed.

[0122] Specifically, the end surface of the adhesive layer 411 close to the light bar 200 can be flush with the end surface of the light guide plate 300 close to the light bar, and the end surface of the adhesive layer 411 away from the light bar 200 can be flush with the end surface of the first adapter plate 410 away from the light bar 200. In this way, the bonding area between the adhesive layer 411 and the light guide plate 300 can be increased, thereby further improving the bonding effect.

[0123] On this basis, reference Figure 8 The backlight module further includes a reflective sheet 600, which is located between the light guide plate 300 and the bottom plate 110, and the reflective sheet 600 is fixed to the side of the first adapter plate 410 away from the bottom plate 110. In this way, on the basis of setting the first adapter plate 410, the light bar 200, the reflective sheet 600 and the light guide plate 300 are all fixed to the first adapter plate 410, so that the light bar 200, the reflective sheet 600, the light guide plate 300 and the first adapter plate 410 can form an integral component, thereby improving the structural stability of the component.

[0124] As an optional implementation scheme, Figure 8 As shown, the adhesive layer 411 may include a first adhesive portion 4111 and a second adhesive portion 4112 arranged along the Z direction, wherein the first adhesive portion 4111 is located between the second adhesive portion 4112 and the first adapter plate 410. The orthographic projection of the first adhesive portion 4111 on the bottom plate 110 and the orthographic projection of the second adhesive portion 4112 on the bottom plate 110 at least partially overlap, and along the Y direction, the width of the first adhesive portion 4111 is greater than the width of the second adhesive portion 4112. At this time, when the reflective sheet 600 and the light guide plate 300 are respectively fixed to the first adapter plate 410, the reflective sheet 600 is adhered to the first adhesive portion 4111, and the light guide plate 300 is adhered to the second adhesive portion 4112.

[0125] The thickness of the first adhesive portion 4111 may be the same as that of the reflective sheet 600. When the reflective sheet 600 is adhered to the first adhesive portion 4111, the two side surfaces of the reflective sheet 600 may be respectively adhered to the first adhesive portion 4111 and the light guide plate 300, so that the light guide plate 300 and the first adhesive portion 4111 cooperate to limit the reflective sheet 600 in the Z direction.

[0126] The thickness of the first adhesive layer 411 can be designed according to the actual usage requirements of the product. For example, when it is determined that the thickness of the second adhesive layer 412 is the same as the thickness of the reflective sheet 600, the thickness of the first adhesive layer 411 can be designed so that after the light guide plate 300 is pasted on the second adhesive layer 412, the light guide plate 300 can be aligned with the lamp beads 220 on the light strip 200.

[0127] Or, as another optional embodiment, refer to Fig. 9 , the adhesive layer 411 may include a first adhesive portion 4111 and a second adhesive portion 4112 arranged along the Y direction, and the second adhesive portion 4112 is located between the first adhesive portion 4111 and the light bar 300. The orthographic projection of the first adhesive portion 4111 on the side plate 120 and the orthographic projection of the second adhesive portion 4112 on the side plate 120 at least partially overlap, and the size of the first adhesive portion 4111 in the Z direction is smaller than the size of the second adhesive portion 4112 in the Z direction. When the light guide plate 300 and the reflective sheet are fixed to the first adapter plate 410 through the adhesive layer 411, the reflective sheet 600 is bonded to the first adhesive portion 4111, and the light guide plate 300 is bonded to the second adhesive portion 4112.

[0128] Furthermore, since the display module in the present application can be applied to outdoor or semi-outdoor environments, the temperature environment in which the display module is located varies greatly. In this case, the light guide plate 300 will inevitably expand and contract due to temperature changes. In order to prevent the light guide plate 300 from being displaced relative to the first adapter plate 410 during expansion, and the bonding effect between the light guide plate 300 and the second adhesive layer 412 from being deteriorated, the expansion coefficient of the first adapter plate 410 can be made close to that of the light guide plate 300. In this way, when the light guide plate 300 is expanding or contracting, the first adapter plate 410 can be deformed synchronously with the light guide plate 300, thereby improving the bonding effect between the light guide plate 300 and the second adhesive layer 412.

[0129] Specifically, the ratio of the expansion coefficient of the first adapter plate 410 to the expansion coefficient of the light guide plate 300 may be 0.9 to 1.1, so as to ensure that the first adapter plate 410 can expand or contract synchronously with the light guide plate 300. Exemplarily, the material of the first adapter plate 410 may be similar to that of the light guide plate 300. If the material of the light guide plate 300 is PC plastic, the material of the first adapter plate 410 may be PC plastic, PVC material, etc.

[0130] Further, refer to Fig.10 , Fig.10 Only a partial structure of the first connecting member 500 in the X direction is shown, which does not represent the entire first connecting member 500. The backlight module in the present application also includes an elastic clip 700, which can be used to clamp the first adapter plate 410 and the first connecting portion 510 at the same time, so as to limit the first adapter plate 410 and the first connecting portion 510 in the Z direction, and prevent the first adapter plate 410 from deforming relative to the first connecting portion 510.

[0131] For details, please refer to Fig.11 and Fig.12 , the elastic clip 700 may include a first clip 710 and a second clip 720 opposite to each other, and a third clip 730 connected between the first clip 710 and the second clip 720. In this case, the elastic clip 700 is in a U-shaped structure as a whole. The first clip 710 is located on the side of the first adapter plate 410 away from the first connection portion 510, and the second clip 720 is located on the side of the first connection portion 510 facing the bottom plate 110, and can be in contact with the surface of the first connection portion 510 facing the bottom plate 110. Under the clamping action of the first clip 710 and the second clip 720, the first adapter plate 410 and the first connection portion 510 are fixed in the Z direction, thereby effectively preventing the first adapter plate 410 from tilting relative to the first connection portion 510, and also not affecting the free expansion of the first adapter plate 410 on the first connection portion 510 along the X direction.

[0132] The width of the first adapter plate 410 along the Y direction may be the same as the width of the first connecting portion 510 along the Y direction, that is, the side of the first adapter plate 410 facing away from the side plate 120 is flush with the side of the first connecting portion 510 facing away from the side plate 120. The third clamping piece 730 may also be attached to the surface of the first adapter plate 410 and the side of the first connecting portion 510 facing away from the side plate 120 to further limit the first adapter plate 410 and the first connecting portion 510 in the Y direction, thereby ensuring the stability of the structure between the first adapter plate 410 and the first connecting portion 510.

[0133] As an optional embodiment, the material of the first clip 710 and the second clip 720 can both be thin metal. For example, the material of the first clip 710 and the second clip 720 is stainless steel. The thickness of the first clip 710 and the second clip 720 can be 0.15mm~0.25mm. For example, the thickness of the first clip 710 and the second clip 720 can be 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, so as to ensure that the elastic clip 700 has strength and elasticity.

[0134] In the present application, the elastic clip 700 may be one, two or more. For example, when there is one elastic clip 700, the elastic clip 700 may be disposed at the end of the first adapter plate 410. When there are two elastic clips 700, the two elastic clips 700 may be disposed at the two ends of the first adapter plate 410 along the X direction. When there are multiple elastic clips 700, the multiple elastic clips 700 may be distributed at different positions of the first adapter plate 410 along the X direction. Fig.10 As shown, since the adhesive layer 411 is provided to fix the light guide plate 300, there is a certain distance between the light guide plate 300 and the first adapter plate 410. When the elastic clip 700 is clamped on the surface of the first adapter plate 410 facing the light guide plate 300, due to the small thickness of the first clip 710, the elastic clip 700 does not come into contact with the light guide plate 300, thereby interfering with the light guide plate 300. In other words, the elastic clip 700 in the present application is located on the side of the light guide plate 300 facing the bottom plate 110. In addition, when a plurality of elastic clips 700 are provided, the adhesive layer 411 can also be designed in sections in the X direction to ensure that there is a gap between two adjacent sections of the adhesive layer 411, so as to facilitate the arrangement of the elastic clip 700.

[0135] It is worth noting that not only Fig.11 As shown, the first adapter plate 410 and the first connecting portion 510 are clamped by an elastic clip 700, so as to limit the position in the Z direction. Figure 4 As shown, when the first connecting member 500 only includes the first connecting portion 510 , the first connecting portion 510 and the first adapter plate 410 may also be clamped by the elastic clip 700 .

[0136] As mentioned above, the material of the first connecting member 500 can be metal, so that it can also serve as a heat sink. When the first adapter 400 is connected to the first connecting member 500, in order to facilitate the thermal expansion and contraction of the first adapter 400 relative to the first connecting member 500, a corresponding limiting structure and a positioning structure can be further provided between the first adapter 400 and the first connecting member 500 to limit the expansion gap of the first adapter 400 relative to the first connecting member 500.

[0137] In some embodiments, reference is made to Fig.10 and Fig.13 , a first hole 413 is provided in the middle of the first adapter plate 410 along the X direction, and the first hole 413 penetrates the first adapter plate 410 along the Z direction. Correspondingly, a first column 511 protruding from the surface of the first adapter plate 410 is provided on the side of the first connecting portion 510 facing the first adapter plate 410, and the first column 511 penetrates the first hole 413. In the initial state, the first column 511 and the first hole 413 can be coaxially arranged, and the distance between the first column 511 and the first hole 413 in the X direction and the Y direction is the same. Exemplarily, the gap between the first column 511 and the inner wall of the first hole 413 in the X direction and the Y direction is 0.1mm to 0.15mm, so that the first column 511 and the first hole 413 can be precisely positioned.

[0138] Further, please refer to Fig.10 , Fig.13 and Fig.14 , along the X direction, the first adapter 400 is located on both sides of the first hole 413 and can also be provided with second holes 414, respectively, and the second holes 414 penetrate the first adapter plate 410 along the Z direction. The first connecting portion 510 is provided with second columns 512 corresponding to the second holes 414 one by one, and each second column 512 is penetrated in the second hole 414. The diameter of the second column 512 is the same as the diameter of the first column 511, the size of the second hole 414 in the X direction is larger than the size of the first hole 413 in the X direction, and the size of the second hole 414 in the Y direction is the same as the size of the first hole 413 in the Y direction, so as to position the second column 512 and the second hole 414 in the Y direction.

[0139] As an optional implementation, the first hole in the present application may be a circular hole, and the second hole may be a racetrack-shaped hole. In this case, the length S1 of the second hole 414 along the X direction may be calculated based on the length L1 of the second hole 414 from the first hole 413 set in the first adapter 400, so as to ensure the expansion gap of the first adapter plate 410. In a specific implementation, S1 may satisfy the following formula: S1 ≥ (L1 * expansion coefficient of the first adapter plate 410 * temperature difference Δt + 0.3mm) * 2, where the temperature difference Δt is the absolute value of (the extreme temperature of the product during operation or storage -25°C).

[0140] The second holes 414 on both sides of the first hole 413 can be symmetrically arranged with the first hole 413 as the center, so as to calculate the length S1 of each second hole 414. In addition, the number of the second holes 414 on each side of the first hole 413 can be designed according to actual needs, that is, the number of the second holes 414 on each side of the first hole 413 can be one, two, three, etc.

[0141] As mentioned above, the adhesive layer 411 can be designed in sections. When the first hole 413 and the plurality of second holes 414 are provided, in order to avoid the first column 511 and the second column 512 from interfering with the adhesive layer 411 provided on the first adapter plate 410, the adhesive layer 411 can also avoid the first hole 413 and the second hole 414 when the section design is performed. In this way, the first adapter 400 and the first connecting portion 510 can be well limited, and the fixing effect of the reflector 600 and the first adapter 400 can also be ensured.

[0142] In some embodiments, reference Fig.15 and Fig.16 , at least one protrusion 415 is provided on the side of the first adapter plate 410 facing the side plate 120, and the protrusion 415 is located on the side of the light bar 200 facing the side plate 120. When two or more protrusions 415 are provided, the multiple protrusions 415 are spaced apart along the X direction. A first groove 416 is provided on the side of the protrusion 415 facing the side plate 120, and the opening of the first groove 416 faces the side plate 120. Correspondingly, the bottom plate 110 is provided with a third column 111, and the third column 111 is penetrated in the first groove 416, so as to limit the back plate 100 and the components through the third column 111 and the first groove 416.

[0143] Correspondingly, the second connection portion 520 is provided with an avoidance hole 521 for avoiding the protrusion 415 , so that the protrusion 415 can extend from the avoidance hole 521 , thereby being limitedly matched with the third column 111 provided on the bottom plate 110 .

[0144] In the present application, taking the setting of a protrusion 415 as an example, at this time, the protrusion 415 is located in the middle of the first adapter plate 410 in the X direction. When the backlight module is in the initial state, the third column 111 can be located in the middle of the first groove 416 along the X direction. At this time, along the Y direction, the gap S2 between the third column 111 and the inner wall of the first groove 416 close to the first adapter plate 410 can meet: S2 ≥ (length of the light guide plate 300 in the Y direction * expansion coefficient of the light guide plate 300 * temperature difference Δt + 0.3mm) / 2, where the temperature difference Δt is the absolute value of (extreme temperature -25°C when the product is running or stored). Through the above design, when the backlight module is designed with dual light strips 200, the S2 on both sides can be added to meet the expansion requirements of the light guide plate 300 in the Y direction.

[0145] Alternatively, in order to limit the expansion gap between the first adapter plate 410 and the back plate 100 in the Y direction, in other embodiments, refer to Fig.17 The first adapter plate 410 is provided with a third hole 417, which is located in the middle of the first adapter plate 410 along the X direction and penetrates the first adapter plate 410 along the Z direction. The first connecting portion 510 is also provided with a position avoidance hole (not shown in the figure) corresponding to the third hole 417 at a position corresponding to the third hole 417, and the shape of the avoidance hole is the same as that of the third hole 417. Correspondingly, the bottom plate 110 is provided with a fourth column 112, which penetrates the avoidance hole and the third hole 417.

[0146] The third hole 417 can be, for example, a runway-shaped hole, in which case the long axis of the third hole 417 extends along the Y direction, that is, the dimension of the third hole 417 along the Y direction is greater than its dimension along the X direction. When the backlight module is in the initial state, the fourth column 112 is located at the center of the third hole 417 along the Y direction. Along the Y direction, the gap S3 between the fourth column 112 and the single-sided side wall of the third hole 417 can satisfy: S3 ≥ (length of the light guide plate 300 in the Y direction * expansion coefficient of the light guide plate 300 * temperature difference Δt + 0.3mm) / 2, where the temperature difference Δt is the absolute value of (extreme temperature -25°C when the product is running or stored). Through the above design, by adding S3 on both sides, the expansion requirements of the light guide plate 300 in the Y direction can be met.

[0147] It is worth noting that in the aforementioned embodiments, Fig.17 As shown, the middle of the first adapter plate 410 is provided with both the first hole 413 and the third hole 417. In specific implementation, the positions of the two holes do not conflict. The middle of the first adapter plate 410 can be understood as all areas included in the middle after extending a certain distance to both sides along the X direction with the center of the first adapter plate 410 as the symmetric center. Therefore, when the first hole 413 and the second hole 417 are provided, the positions of the two holes are not necessarily the absolute center of the first adapter plate 410.

[0148] In some embodiments, reference Fig.18 The adapter 400 includes a first adapter plate 410 and a second adapter plate 420. The second adapter plate 420 is connected to the side of the first adapter plate 410 facing the back plate 100, and the second adapter plate 420 is located between the light bar 200 and the side plate 120. The light guide plate 300 can be bonded to the side of the first adapter plate 410 facing away from the bottom plate 110 through the adhesive layer 411, and the light bar 200 is fixed to the side of the second adapter plate 420 facing the light guide plate 300.

[0149] As an optional implementation, the first adapter plate 410 and the second adapter plate 420 can be designed as an integrated type, so that the adapter 400 can not only play a role in fixing and supporting the light guide plate 300 and the light bar 200, but also facilitate improving the stability inside the backlight module. Alternatively, as another optional implementation, the material of the second adapter 400 is metal, the light bar 200 is fixed on the second adapter 400, and the heat generated by the light bar 200 can be transferred to the bottom plate 110 through the second adapter 400, thereby achieving a good heat dissipation effect.

[0150] In this application, reference is made to Fig.18 and Fig.19 , at least one protrusion 415 is provided on the side of the first adapter plate 410 facing the side plate 120, a first groove 416 is provided on the side of the protrusion 415 facing the side plate 120, and a third column 111 is provided on the bottom plate 110, and the third column 111 is passed through the first groove 416. Specifically, the protrusion 415 can be fixed to the side of the second adapter plate 420 facing the side plate 120, that is, the protrusion 415 protrudes from the surface of the second adapter plate 420, and there is a certain gap between the protrusion 415 and the side plate 120, so as to provide an expansion gap for the light guide plate 300.

[0151] About Fig.19 The positional relationship between the third column 111 and the first slot 416 can be referred to in the above embodiment. Fig.16 The contents of the third column 111 and the first groove 416 have been introduced, so they will not be repeated here.

[0152] Alternatively, as another embodiment, the protrusion 415 may also be directly connected to the side of the first adapter plate 410 facing the back plate 120. In this case, the second adapter plate 420 is provided with an avoidance structure for avoiding the protrusion 415, as shown in FIG. Fig.16 In addition, the side of the protrusion 415 facing the back plate 120 may be flush with the side of the second adapter plate 420 facing the back plate, or the side of the protrusion 415 facing the back plate 120 may also protrude from the side surface of the second adapter plate 420 facing the back plate.

[0153] Further, in the present application, the adapter 400 can also be implemented as described in the above embodiments and Fig.17 As described in the above, a third hole 417 is provided in the middle of the first adapter 400, and a fourth column 112 provided on the bottom plate 110 is provided between the third hole 417 and the back plate 100 for positioning. The positional relationship between the third hole 417 and the fourth column 112 can also be referred to the description in the above embodiment, and will not be repeated here.

[0154] It is worth noting that in the present application, except for the specific shape of the adapter 400 and the connection relationship between the adapter 400 and the light bar 200 which are different from those in the aforementioned embodiments, the remaining structures, such as the connection between the light guide plate 300 and the reflective sheet 600, are the same as those in the aforementioned embodiments, and therefore will not be repeated here.

[0155] Further, in this application, reference is made to Figures 20a to 20d In order to improve the heat dissipation effect of the backlight module, a heat dissipation clip 900 is also provided, and the heat dissipation clip 900 can be used to dissipate heat for the light bar 200.

[0156] Specifically, as an implementation scheme, refer to Fig.20a The heat dissipation clip 900 includes a first heat dissipation plate 910, and the first heat dissipation plate 910 is located between the light bar 200 and the second adapter plate 420. For example, the opposite sides of the first heat dissipation plate 910 can be fixed to the light bar 200 and the second adapter plate 420 by adhesive, respectively, so as to fix the first heat dissipation plate 910. The heat generated during the operation of the light bar 200 can be transferred to the first heat dissipation plate 910 to reduce the temperature of the light bar 200 and ensure the stable operation of the light bar 200.

[0157] As another embodiment, reference Fig.20b The heat dissipation clip 900 includes a first heat dissipation plate 910 and a second heat dissipation plate 920. The first heat dissipation plate 910 is located between the light bar 200 and the second adapter plate 420, and the second heat dissipation plate 920 is located on the side of the second adapter plate 420 away from the bottom plate 110. The first heat dissipation plate 910 and the second heat dissipation plate 920 are connected to each other. Exemplarily, the two can be an integrated structure to improve the overall structural stability of the heat dissipation clip 900.

[0158] The opposite sides of the first heat sink 910 can be fixed to the light bar 200 and the second adapter plate 420 by adhesive respectively, and the second heat sink 920 can also be fixed to the second adapter plate 420 by adhesive, so that the heat sink 900, the light bar 200 and the second adapter plate 420 form a relatively fixed overall structure. After the heat generated by the light bar 200 is transferred to the first heat sink 910, it is transferred from the first heat sink 910 to the second heat sink 920. In this way, the heat dissipation area of ​​the heat sink 900 can be increased, thereby improving the heat dissipation efficiency.

[0159] As another embodiment, reference Fig.20cThe heat dissipation clip 900 includes a first heat dissipation plate 910, a second heat dissipation plate 920 and a third heat dissipation plate 930 connected in sequence, the third heat dissipation plate 910 is located between the light bar 200 and the second adapter plate 420, the second heat dissipation plate 920 is located on the side of the second adapter plate 420 away from the bottom plate 110, and the third heat dissipation plate 930 is located on the side of the second adapter plate 420 facing the side plate 120. Exemplarily, the opposite sides of the first heat dissipation plate 910 can be fixed to the light bar 200 and the second adapter plate 420 by adhesive, respectively, the second heat dissipation plate 920 can also be fixed to the side of the second adapter plate 420 away from the bottom plate 110 by adhesive, and the third heat dissipation plate 930 can also be fixed to the side of the second adapter plate 420 facing the side plate 120 by adhesive. In addition, there is a certain gap between the third heat dissipation plate 930 and the side plate 120 to provide an expansion gap for the light guide plate 300.

[0160] Alternatively, the first heat sink 910, the second heat sink 920 and the third heat sink 930 may also be an integrated structure. Since the heat sink clip 900 is a U-shaped structure as a whole, the heat sink clip 900 may also be made of elastic material as a whole, so that the heat sink clip 900 is clamped on the second adapter plate 420, so that the heat sink clip 900 and the second adapter plate 420 are relatively fixed. At this time, the light bar 200 can be fixed on the first heat sink 910 by thermally conductive adhesive, so as to achieve effective heat conduction.

[0161] In addition, one end of the third heat sink 930 away from the second heat sink 920 can also contact the base plate 110. While the third heat sink 930 is set to increase the heat dissipation area, the third heat sink 930 can also be in thermal contact with the base plate 110, so that the heat can be dissipated out of the backlight module through the base plate 110 to improve the heat dissipation efficiency.

[0162] As another embodiment, reference Fig.20d and Fig.21 The heat dissipation clip 900 includes a first heat dissipation plate 910, a second heat dissipation plate 920, a third heat dissipation plate 930 and a fourth heat dissipation plate 940. The first heat dissipation plate 910 and the third heat dissipation plate 930 are opposite to each other, and the second heat dissipation plate 920 is connected between the first heat dissipation plate 910 and the third heat dissipation plate 930 to form a U-shaped structure. The first heat dissipation plate 910, the second heat dissipation plate 920, the third heat dissipation plate 930 and the fourth heat dissipation plate 940 can be an integrated structure, and the formed U-shaped structure is clamped to the second adapter plate 420 from the side of the second adapter plate 420 away from the bottom plate 110 to ensure that the heat dissipation clip 900 and the second adapter plate 420 are relatively fixed.

[0163] Specifically, the first heat sink 910 is located between the light bar 200 and the second adapter plate 420, the second heat sink 920 is located on the side of the second adapter plate 420 away from the bottom plate 110, the third heat sink 930 is located on the side of the second adapter plate 420 away from the light bar 200, and the fourth heat sink 940 is connected to the side of the third heat sink 930 away from the second heat sink 920, and can be attached to the bottom plate 110. The light bar 200 can be attached to the first heat sink 910 by thermally conductive adhesive. At this time, the heat generated by the light bar 200 can be transferred to the third heat sink 930, the third heat sink 930 and the fourth heat sink 940 in sequence through the first heat sink 910, and finally the heat is transferred from the bottom plate 110. Since the fourth heat sink 940 attached to the bottom plate 120 is provided, the contact area between the fourth heat sink 940 and the bottom plate 110 can be increased, thereby improving the heat dissipation effect.

[0164] Alternatively, the two opposite sides of the first heat sink 910 may be fixed to the light bar 200 and the second adapter plate 420 respectively by adhesive, and the second heat sink 920 and the third heat sink 930 may also be fixed to the second adapter plate 420 respectively by adhesive. A certain gap is left between the fourth heat sink 940 and the side plate 120 to provide an expansion gap for the light guide plate 300.

[0165] Figures 20a to 20d In the embodiment, the first heat dissipation plate 910, the second heat dissipation plate 920, the third heat dissipation plate 930 and the fourth heat dissipation plate 940 can all be made of metal to ensure a good heat dissipation effect.

[0166] In the present application, the adapter 400 may further include a first limiting structure (not shown in the figure) connected to the first adapter plate 410, the first limiting structure is located on the side of the second adapter plate 420 away from the light bar 200, and the bottom plate 110 is provided with a second limiting structure (not shown in the figure), and the first limiting structure and the second limiting structure cooperate with each other to limit the first adapter plate 410 and the bottom plate 110. The first limiting structure can be, for example, Fig.19 The protrusion 415 and the first groove 416 shown in the figure, the second limiting structure can be, for example, Fig.19 As shown in the third column 111. Since the first limiting structure protrudes from the side surface of the second adapter plate 420 away from the light bar 200, in order to facilitate the third heat dissipation plate 930 to be fixedly connected to the second adapter plate 420, refer to Fig. 22 The third heat dissipation plate 930 is provided with an avoidance groove 950 for avoiding the first limiting structure and the second limiting structure, so that the first limiting structure and the second limiting structure can protrude out of the surface of the third heat dissipation plate 930 without affecting the limiting effect between the first adapter plate 410 and the bottom plate 110.

[0167] It is worth noting that Figures 20a to 20dThe structure of any heat dissipation clip 900 shown in FIG. Fig.18 In the backlight module, when the backlight module is as follows Figure 5 or Figure 6 In the structure shown, a heat dissipation clip 900 may also be used to dissipate heat from the light bar 200 .

[0168] When the backlight module in the reference group design is subjected to mechanical vibration, the light guide plate will be displaced in both the X and Y directions due to the compression of the rubber strip or the large amount of movement of the bending edge limit in the Y direction, which is easy to cause scratches. Based on this, in the backlight module in the present application, after the first adapter 400, the first connector 500, the light guide plate 300, the light bar 200 and the reflector 600 are assembled to form a component, the component can also be limited by setting a limiting structure to prevent the component from being displaced significantly in the back plate 100.

[0169] As described in the above embodiment, a first slot 416 is provided on the first adapter plate 410, and the assembly and the back plate 100 are limited by the third column 111 passing through the first slot 416. Fig.16 When the backlight module is in the initial state, the third column 111 is located in the middle of the first groove 416 along the X direction. At this time, there is a certain gap between the third column 111 and the two opposite side walls of the first groove 416 arranged along the X direction. Exemplarily, the gap between the third column 111 and the side wall of the first groove 416 is 0.1mm to 0.15mm, so as to limit the movement of the component relative to the back plate 100 in the X direction to only 0.1mm to 0.15mm.

[0170] When the Y direction is limited between the component and the back plate 100, as an optional implementation scheme, refer to Figure 23 to Figure 27 The back panel 100 includes a first side panel 120a and a second side panel 120b. A light bar 200 is provided between the first side panel 120a and the light guide plate 300, and no light bar 200 is provided between the second side panel 120b and the light guide plate 300. The second side panel 120b is provided with a second groove 121 along the third direction, and at least one limiting portion 130 is provided between the second groove 121 and the light guide plate 300. At least two first bosses 310 are provided on the side of the light guide plate 300 facing the second side panel 120b. The at least two first bosses 310 are arranged along the Y direction, and a third groove 320 is formed between any two adjacent first bosses 310. In the present application, an example is taken in which a limiting portion 130 is provided between the second groove 121 and the light guide plate 300, and two first bosses 310 are provided on the light guide plate 300.

[0171] The opening of the second slot 121 is not parallel to the opening direction of the third slot 320. Specifically, the opening of the second slot 121 is located on the side of the second side plate 120b away from the bottom plate 110, and the opening of the third slot 320 is located on the side of the first boss 310 toward the second side plate 120b. The limiting portion 130 is disposed in the third slot 320 to achieve a limiting effect between the light guide plate 300 and the second side plate 120b.

[0172] When the backlight module is in the initial state, refer to Fig. 27 In the Y direction, the gap d1 between the side wall of the third groove 320 and the limiting portion 130 can be 0.1 mm to 0.15 mm, thereby limiting the movement of the component relative to the back plate 100 in the Y direction to only 0.1 mm to 0.15 mm.

[0173] It is understandable that the movement of the component during vibration is limited to 0.1 mm to 0.15 mm. The smaller the displacement, the higher the mechanical stability.

[0174] In addition, along the X direction, there is a certain gap between the limiter 130 and the bottom wall of the third groove 320 to meet the expansion requirements of the light guide plate 300 in the X direction. Specifically, when designing the gap S4 between the limiter 130 and the bottom of the third groove, S4 can meet the following conditions: S4 ≥ (length of the light guide plate 300 in the X direction * expansion coefficient of the light guide plate 300 * temperature difference Δt + 0.3mm) / 2, where the temperature difference Δt is the absolute value of (extreme temperature -25°C when the product is running or stored). Through the above design, when the backlight module is designed with dual light strips 200, the S4 on both sides can be added together to meet the expansion requirements of the light guide plate 300 in the X direction.

[0175] Continue to refer Fig.26 and Fig. 27 , the side of the position-limiting portion 130 away from the bottom plate 110 has a first surface 1301, the side of the light guide plate 300 away from the bottom plate 110 has a first board surface 300a, and the dimension between the first board surface 300a and the bottom plate 100 in the Z direction is less than or equal to the dimension between the first surface 1301 and the bottom plate 100 in the Z direction. In other words, the side of the position-limiting portion 300 away from the bottom plate 110 protrudes from the side of the light guide plate 300 away from the bottom plate 110, or the side of the position-limiting portion away from the bottom plate 110 is flush with the side of the light guide plate 300 away from the bottom plate 110.

[0176] Further, please refer to Figures 27 to 33 The backlight module in the present application further includes an optical film 800 , and the optical film 800 is located on a side of the light guide plate 300 away from the bottom plate 110 .

[0177] like Fig.29 , Fig.30 as well as Fig.33As shown, the limiting portion 130 disposed between the second groove 121 and the light guide plate 300 includes a first limiting portion 103a, the first limiting portion 130a is provided with a fourth groove 1311 along the Z direction, the fourth groove 1311 is provided with a hanging ear rib 1312, and along the Y direction, the hanging ear rib 1312 can be located in the middle of the fourth groove 1311. Correspondingly, the optical film 800 is provided with a second boss 810, the second boss 810 is provided with a hanging ear hole 820, and the hanging ear hole 820 penetrates the second boss 810 along the Z direction. The second boss 810 is located in the fourth groove 1311, and the hanging ear rib 1312 is penetrated through the hanging ear hole 820.

[0178] Or, if Fig. 27 , Fig.28 as well as Fig.32 As shown, the limiting portion 130 disposed between the second groove 121 and the light guide plate 300 includes a second limiting portion 103b, and the second limiting portion 130b has a fifth groove 1313 formed along the Z direction. Correspondingly, the optical film 800 has a third boss 830, and the third boss 830 is located in the fifth groove 1313.

[0179] It is worth noting that, in the present application, among the limiting portions 130 on both sides arranged along the X direction, the limiting portions 130 on both sides can be designed according to the first limiting portion 130a, or, the limiting portions 130 on both sides can be designed according to the second limiting portion 130b, or, the limiting portion 130 on one side is designed according to the first limiting portion 130a, and the limiting portion 130 on the other side is designed according to the second limiting portion 130b.

[0180] refer to Fig.33 , when the backlight module is in the initial state, along the X direction, the ear rib 1312 can be located in the middle of the ear hole 820. At this time, along the X direction, the gap d2 between the inner wall of the ear hole 820 and the ear rib 1312 can be 0.1mm~0.15mm, which means that the movement of the optical film 800 in the X direction is limited to only 0.1mm~0.15mm. In addition, along the Y direction, the gap d3 between the second boss 810 and the inner wall of the film material limiting groove 1311 can be 0.1mm~0.15mm, so as to limit the movement of the optical film 800 in the Y direction to only 0.1mm~0.15mm. In this way, through the precise positioning design in the X and Y directions, the movement of the optical film 800 during the vibration process is controlled within 0.1mm~0.15mm, which is conducive to improving the mechanical stability of the backlight module.

[0181] For reference Fig.34 Fig.35 , Fig.34Only a partial structure of the light bar in the X direction is shown. The light bar 200 in the present application may specifically include a carrier 210, a plurality of lamp beads 220, at least one stopper 230 and a connector 240, wherein the lamp beads 220, the stopper 230 and the connector 240 are all arranged on the side of the carrier 210 facing the light guide plate 300. The plurality of lamp beads 220 are arranged at intervals, and the stopper 230 is arranged between two adjacent lamp beads 220.

[0182] The height of the stopper 230 protruding from the carrier plate 210 is greater than the height of the lamp bead 220 protruding from the carrier plate 210, so that the light guide plate 300 can be prevented from colliding with the lamp bead 220 and causing damage to the lamp bead 220. Since the light bar 200 and the light guide plate 300 in the present application are relatively fixed, as an optional implementation scheme, when the light guide plate 300, the light bar 200 and the adapter 400 are assembled, the light guide plate 300 and the stopper 230 can be made to abut against each other, so that the gap between the light guide plate 300 and the lamp bead 220 can be minimized, thereby improving the light input efficiency. For example, in a conventional light bar 200, the height of the lamp bead 220 is 0.6mm, and the height of the stopper 230 is 0.7mm. Through the above design, the gap between the light guide plate 300 and the lamp bead 220 can be reduced to 0.1mm. Taking a 27-inch display device as an example, in the reference group of products, the gap between the light guide plate 300 and the lamp bead 220 is 0.45 mm. When the gap is reduced to 0.1 mm, the light input efficiency can be increased from the original 84.3% to 95.2%. It can be seen that the light input efficiency has been significantly improved.

[0183] refer to Fig.35 , the connector 240 is located at one end of the carrier 210. Since the connector 240 is located on the side of the carrier 210 facing the light guide plate 300, in order to avoid interference between the connector 240 and the light guide plate 300, an avoidance structure for avoiding the connector is also provided at one end of the light guide plate 300 close to the connector 240. Specifically, the avoidance structure may include a first avoidance surface 301 and a second avoidance surface 302 connected to each other, wherein the first avoidance surface 301 is parallel to the X direction, and the second avoidance surface 302 is parallel to the Y direction. It can be understood that the first avoidance surface 301 can be regarded as a structure formed by the side edge of the light guide plate 300 parallel to the Y direction being concave along the X direction, and the second avoidance surface 302 can be regarded as a structure formed by the side edge of the light guide plate 300 parallel to the X direction being concave along the Y direction. In this way, an L-shaped notch is formed at the corner of the light guide plate 300 close to the connector 240, and the connector 240 can be located in the notch.

[0184] There is a certain gap between the first avoidance surface 301 and the connector 240 , and there is also a certain gap between the second avoidance surface 301 and the connector 240 , so as to provide an expansion gap for the light guide plate 300 .

[0185] refer to Fig.36The bottom plate 110 is provided with an opening 113 at a position facing the connector 240, and the connector 240 is provided with a socket 241 for connecting to an external power source, and the socket 241 is arranged toward the opening 113 so that the socket 241 can be plugged into the external power source through the opening 113. The bottom plate 110 has an inner surface facing the light guide plate 300 and an outer surface 110a facing away from the light guide plate 300, and the light guide plate 300 has a second board surface (not shown in the figure) on the side facing the bottom plate 110. For ease of description, the outer surface 110a of the bottom plate 110 is defined as the outer surface plane, and the plane where the socket 241 of the connector 240 is located is the end surface. The end surface is located between the outer surface plane and the second board surface, and the dimension between the end surface and the second board surface in the Z direction is less than or equal to the dimension between the outer surface plane and the second board surface in the Z direction. That is to say, when the outer surface 110a of the base plate 110 is placed upward, the outer surface 110a is higher than the surface of the port 241 of the connector 240. Compared with the reference group product in which the connector 240 is arranged on the outside of the back plate 100, the connector 240 is arranged inside the back plate 100 in the present application, which can help reduce the overall height of the display module, thereby facilitating the realization of a lightweight design of the product.

[0186] In some embodiments, reference Fig.37 , the light bar 200 may include a carrier plate 210 and a connecting plate 250 connected to each other, wherein the carrier plate 210 is located between the light guide plate 300 and the side plate 120, and the connecting plate 250 is located between the light guide plate 300 and the bottom plate 110. Of course, the light bar 200 in the present application also includes lamp beads 220, stop blocks 230 and connectors 240. The connection between the above-mentioned lamp beads 220, stop blocks 230 and connectors 240 and the carrier plate 210 can refer to Fig.34 The structure introduced in will not be repeated here.

[0187] For reference Fig.37 and Fig.38 The first adapter plate 410 is located on the side of the connecting plate 250 away from the bottom plate 100. A sinking platform 418 is provided on the side of the first adapter plate 410 facing the connecting plate 250, and a position-avoiding groove 251 is provided at the part of the connecting plate 250 facing the sinking platform 418. The position-avoiding groove 251 can be set through the connecting plate 250 along the Z direction, and the sinking platform 418 is located in the position-avoiding groove 251, so as to facilitate the positioning of the first adapter plate 410.

[0188] In this embodiment, when the backlight module is in the initial state, along the X direction, the sink 418 can be located in the middle of the avoidance groove 2111, and at this time, a certain gap is maintained between the sink 418 and the inner walls of the avoidance groove 251 on both sides opposite to each other along the X direction. In addition, along the Y direction, a certain gap is also maintained between the end of the sink 418 facing the second connecting plate 212 and the inner wall of the avoidance groove 251.

[0189] Exemplarily, in the X direction, the gap d5 between the sink 418 and the inner wall of the avoidance groove 251 can be 0.1mm~0.15mm, and in the Y direction, the gap between the sink 418 and the inner wall of the avoidance groove 2111 can also be 0.1mm~0.15mm, so as to limit the movement of the light guide plate 300 relative to the back plate 100 and minimize the movement of the light guide plate 300.

[0190] In order to facilitate the Z-direction limiting of the connecting plate 250 and the first adapter plate 410, the present application may also be provided with the following Fig.11 and Fig.12 The elastic clip 700 shown in the figure can be used to clamp the connecting plate 250 and the first adapter plate 410, so that the adapter plate 250 and the first adapter plate 410 are relatively fixed in the Z direction.

[0191] In addition, the present application may also include Figure 4 As shown in FIG, a first connecting portion 510 is provided between the connecting plate 250 and the bottom plate 110. Alternatively, Figure 5 As shown, a second connection portion 520 is disposed on the side of the carrier 210 away from the light guide plate 300. The material of the second connection portion 520 can also be a metal material with good thermal conductivity to improve the heat dissipation effect of the light bar 200. Alternatively, Figure 6 As shown, a first connecting portion 510 is arranged between the connecting plate 250 and the bottom plate 110, and a second connecting portion 520 is arranged on the side of the carrier plate 210 away from the light guide plate 300. The first connecting portion 510 and the second connecting portion 520 are connected to each other so that the first connecting portion 510 and the second connecting portion 520 can fix and support the light bar 200 and the first adapter plate 410. Of course, when the first connecting portion 510 and the second connecting portion 520 are made of metal materials with good thermal conductivity, they can also achieve a good heat dissipation effect.

[0192] It is worth noting that when Figure 4 or Figure 6 As shown, when the first connecting portion 510 is provided on the side of the connecting plate 250 facing the bottom plate, the following is further provided: Fig.11 and Fig.12 When the elastic clip 700 is shown in FIG, the elastic clip 700 can clamp the first connecting portion 510, the connecting plate 250 and the first adapter plate 410 at the same time, so that the three are limited in the Z direction.

[0193] In some embodiments, reference Fig.39 When the light bar 200 includes a carrier plate 210 located between the light guide plate 300 and the side plate 120 and a connecting plate 250 located between the light guide plate 300 and the bottom plate 110, the first adapter plate 410 is different from Fig.38The first adapter plate 410 and the connecting plate 250 are not arranged on the side of the connecting plate 250 away from the bottom plate 110, but the first adapter plate 410 and the connecting plate 250 are an injection-molded integrated structure. In other words, the connecting plate 250 is not only a part of the light bar 200, but also serves as the first adapter plate 410. At this time, the light guide plate 300 is fixed to the side of the connecting plate 250 away from the bottom plate 110.

[0194] Further, refer to Fig.40 , L-shaped rubber strips 1000 are attached to the four corners of the back panel 100. In the Y direction, the L-shaped rubber strips 1000 are located between the light bar 200 and the side panel 120, and abut against the light bar 200. In the X direction, the L-shaped rubber strips 1000 are located between the light guide plate 300 and the side panel 120, and abut against the light guide plate 300. The L-shaped rubber strips 1000 can be deformed. When the light guide plate 300 expands in the X direction or the Y direction, the light bar 200 can be pushed to compress the L-shaped rubber strips 1000. In this way, the L-shaped rubber strips 1000 provide effective expansion space for the light guide plate 300.

[0195] It should be noted that when the light bar 200 and the side plate 120 are provided as follows Figure 5 or Figure 6 The second connection portion 520 shown or Fig.18 When the second adapter plate 420 is shown, the L rubber strip abuts against the second connecting portion 520 or the second adapter plate 420 .

[0196] Based on the same inventive concept, the present application may also provide a display module, which includes a backlight module as described in any of the aforementioned embodiments.

[0197] Based on the same inventive concept, the present application may also provide a display device, wherein the display module includes the display module described in the aforementioned embodiment.

[0198] In summary, the backlight module, display module and display device in the present application not only reduce the volatility of the brightness of the light guide plate and ensure the stability of the display image, but also improve the light input efficiency, improve the mechanical stability inside the backlight module, and reduce the risk of scratches.

[0199] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A backlight module, wherein: include: A back plate, the back plate comprising a bottom plate and a plurality of side plates connected to the bottom plate, wherein the plurality of side plates are sequentially connected end to end to form an accommodating space; A light bar, a light guide plate and an adapter located in the accommodating space; The adapter comprises a first adapter plate, and the first adapter plate is located between the light guide plate and the bottom plate; The light guide plate is fixed to a side of the first adapter plate facing away from the bottom plate; The light bar is located between the light guide plate and the side plate, and the light bar is fixedly connected to the first adapter plate.

2. The backlight module according to claim 1, wherein: It also includes a first connecting member, the first connecting member includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion is located between the first adapter portion and the bottom plate, and the second connecting portion is located between the light bar and the side plate; The first adapter plate is fixed to a side of the first connecting portion facing away from the bottom plate; The light bar is fixed to a side of the second connecting portion facing the light guide plate.

3. The backlight module according to claim 2, wherein: It also includes an elastic clip, which is used to clamp the first adapter plate and the first connecting portion; The elastic clip includes a first clip and a second clip arranged opposite to each other and a third clip connecting the first clip and the second clip, the first clip is located on a side of the first adapter plate away from the bottom plate, the second clip is located on a side of the first connecting portion close to the bottom plate, and the third clip is located between the first clip and the second clip.

4. The backlight module according to claim 3, wherein: The first clamp and the second clamp are made of thin metal, and / or the thickness of the first clamp and the second clamp is 0.15 mm to 0.25 mm.

5. The backlight module according to any one of claims 2 to 4, wherein: The first adapter plate is provided with a first hole, the first connecting part is provided with a first column, the first column is passed through the first hole, the size of the first hole along the first direction is the same as the size of the first hole along the second direction, the first direction is the length direction of the light bar, and the second direction is the arrangement direction of the light bar and the light guide plate.

6. The backlight module according to claim 5, wherein: Along the first direction, the first adapter plate is provided with at least one second hole on both sides of the first hole, and the first connecting portion is further provided with second columns corresponding to the second holes one by one, and the second columns are inserted into the corresponding second holes; A size of the second hole along the first direction is greater than a size of the first hole along the first direction, and a size of the second hole along the first direction is the same as a size of the first hole along the first direction.

7. The backlight module according to any one of claims 2 to 6, wherein: The first connecting member is made of metal.

8. The backlight module according to claim 1, wherein: The adapter also includes a second adapter plate connected to the first adapter plate, the second adapter plate is located between the side plate and the light bar, and is connected to a side of the first adapter plate facing the side plate; The light bar is fixed to a side of the second adapter plate facing the light guide plate.

9. The backlight module according to claim 8, wherein: The second adapter plate is made of metal.

10. The backlight module according to claim 8, wherein: It also includes a heat dissipation clip, which includes a first heat dissipation plate. The first heat dissipation plate is located between the light bar and the second adapter plate, and the first heat dissipation plate is fixed to the light bar.

11. The backlight module according to claim 10, wherein: The heat dissipation clip further includes a second heat dissipation plate connected to the first heat dissipation plate, and the second heat dissipation plate is fixed to a side of the second adapter plate away from the bottom plate; or The heat dissipation clip further includes a second heat dissipation plate and a third heat dissipation plate, the second heat dissipation plate is connected between the first heat dissipation plate and the third heat dissipation plate, the second heat dissipation plate is fixed to a side of the second adapter plate away from the bottom plate, and the third heat dissipation plate is fixed to a side of the second adapter plate away from the light bar; or The heat dissipation clip also includes a second heat dissipation plate, a third heat dissipation plate and a fourth heat dissipation plate connected in sequence, the second heat dissipation plate is connected to the first heat dissipation plate, the second heat dissipation plate is fixed to a side of the second adapter plate away from the bottom plate, the third heat dissipation plate is fixed to a side of the second adapter plate away from the light strip, the fourth heat dissipation plate is fixed to the bottom plate, and there is a gap between the fourth heat dissipation plate and the side plate.

12. The backlight module according to claim 11, wherein: The adapter also includes a first limiting structure connected to the first adapter plate, the first limiting structure is located on a side of the second adapter plate facing the side plate, the bottom plate is provided with a second limiting structure, and the first limiting structure and the second limiting structure cooperate to limit the bottom plate and the adapter; When the heat dissipation clip includes a third heat dissipation plate, the heat dissipation plate is provided with an avoidance groove for avoiding the first limiting structure and the second limiting structure.

13. The backlight module according to claim 1, wherein: The adapter includes a first connector connected to the first adapter plate, the light bar includes a second connector, the second connector is located at a side away from the light guide plate, and the first connector is snap-connected with the second connector.

14. The backlight module according to claim 1, wherein: The light bar includes a carrier plate and a connecting plate connected to each other, the carrier plate is located between the light guide plate and the side plate, the connecting plate is located between the light guide plate and the bottom plate, and the first adapter plate and the connecting plate are an integrally formed structure.

15. The backlight module according to claim 1, wherein: The light bar includes a carrier plate and a connecting plate connected to each other, the carrier plate is located between the light guide plate and the side plate, the connecting plate is located between the light guide plate and the bottom plate, and the first adapter plate is located on a side of the connecting plate away from the bottom plate.

16. The backlight module according to claim 15, wherein: A sinking platform is provided on one side of the first adapter plate facing the connecting plate, and the connecting plate is provided with a avoiding groove, and the sinking platform is located in the avoiding groove.

17. The backlight module according to any one of claims 1 to 16, wherein: The adapter also includes at least one protrusion connected to the first adapter plate, the protrusion is located between the side plate and the light bar, and the protrusion has a first groove on a side facing the side plate; The bottom plate is provided with a third column, and the third column is passed through the first groove.

18. The backlight module according to claim 17, wherein: The adapter also includes a second adapter plate connected to the first adapter plate, and the second adapter plate is located between the light bar and the side plate; The protrusion is fixed to a side of the second adapter plate facing the side plate; or The protrusion is fixed to a side of the first adapter plate facing the side plate, and the second adapter plate is provided with an avoidance structure for avoiding the protrusion.

19. The backlight module according to any one of claims 1 to 18, wherein: The bottom plate is provided with a fourth column, the first adapter plate is provided with a third hole, the dimension of the third hole along the second direction is greater than the dimension of the third hole along the first direction, and the fourth column is inserted into the third hole; The first direction is the length direction of the light bar, and the second direction is the arrangement direction of the light bar and the light guide plate.

20. The backlight module according to any one of claims 1 to 19, wherein: The ratio of the expansion coefficient of the first adapter plate to the expansion coefficient of the light guide plate is 0.9 to 1.

1.

21. The backlight module according to any one of claims 1 to 20, wherein: The back panel comprises a first side panel and a second side panel connected to each other, the light bar is arranged between the first side panel and the light guide plate, and the light bar is not arranged between the second side panel and the light guide plate; The second side plate is provided with a second groove along the third direction, and at least one limiting portion is provided between the second groove and the light guide plate; At least two first bosses are provided on one side of the light guide plate facing the second side plate, the at least two first bosses are arranged along the second direction, a third groove is formed between two adjacent first bosses, and the limiting portion is penetrated through the third groove; The second direction is an arrangement direction of the light guide plate and the light bar, and the third direction is a thickness direction of the light guide plate.

22. The backlight module according to claim 21, wherein: An opening direction of the second groove is not parallel to an opening direction of the third groove.

23. The backlight module according to claim 22, wherein: The limiting portion has a first surface on a side away from the bottom plate, and the light guide plate has a first board surface on a side away from the bottom plate, and the dimension between the first board surface and the bottom plate along the third direction is less than or equal to the dimension between the first surface and the bottom plate along the third direction.

24. The backlight module according to claim 23, wherein: It also includes an optical film, which is located on a side of the light guide plate away from the bottom plate; The at least one limiting portion includes a first limiting portion, the first limiting portion is provided with a fourth groove along the third direction, the fourth groove is provided with an ear hanging rib, the optical film includes a second boss, the second boss is provided with an ear hanging hole, the second boss is located in the fourth groove, and the ear hanging rib is passed through the ear hanging hole; and / or The at least one limiting portion includes a second limiting portion, the second limiting portion is provided with a fifth groove along the third direction, and the optical film includes a third boss, and the third boss is located in the fifth groove.

25. The backlight module according to any one of claims 1 to 24, wherein: It also includes an adhesive layer, which is located between the light guide plate and the first adapter plate. The light guide plate is fixed to a side of the first adapter plate away from the bottom plate through the adhesive layer.

26. The backlight module according to claim 25, wherein: Also includes a reflective sheet, the reflective sheet is located between the light guide plate and the bottom plate; The bonding layer comprises a first bonding portion and a second bonding portion which are connected to each other, the first bonding portion is bonded to the reflective sheet, the second bonding portion is bonded to the light guide plate, the second bonding portion is located between the first bonding portion and the light bar, the orthographic projection of the first bonding portion on the side panel at least partially overlaps with the orthographic projection of the second bonding portion on the side panel, and the size of the first bonding portion in the third direction is smaller than the size of the second bonding portion in the third direction; or, The adhesive layer comprises a first adhesive portion and a second adhesive portion which are connected to each other, the first adhesive portion is arranged on a side of the first adapter away from the bottom plate, the reflective sheet is adhered to the first adhesive portion, the second adhesive portion is arranged on a side of the first adhesive portion away from the first adapter, the light guide plate is adhered to the second adhesive portion, an orthographic projection of the first adhesive portion on the bottom plate and an orthographic projection of the second adhesive portion on the bottom plate at least partially overlap, and a size of the first adhesive layer in the second direction is larger than a size of the second adhesive layer in the second direction; The second direction is an arrangement direction of the light guide plate and the light bar, and the third direction is a thickness direction of the light guide plate.

27. The backlight module according to any one of claims 1 to 26, wherein: The light bar comprises a carrier plate, a plurality of lamp beads and at least one stop block, wherein the lamp beads and the stop block are fixed to a side of the carrier plate facing the light guide plate, the plurality of lamp beads are arranged at intervals, and the stop block is located between adjacent lamp beads; The height of the limit block protruding from the carrier plate is greater than the height of the lamp beads protruding from the carrier plate, and the light guide plate abuts against the limit block.

28. The backlight module according to claim 27, wherein: The light bar further comprises a connector, and the connector is fixed to a side of the carrier plate facing the light guide plate; The connector has a socket, and the bottom plate is provided with an opening facing the socket; The plane where the socket is located is the end surface, the plane where the outer surface of the bottom plate is located is the outer surface plane, the light guide plate has a second plate surface on the side facing the bottom plate, and the end surface is located between the outer surface plane and the second plate surface; The distance between the end surface and the second plate surface in the third direction is less than or equal to the distance between the outer surface plane and the second plate surface in the third direction; Wherein, the third direction is the thickness direction of the light guide plate.

29. A display module, wherein: It comprises the backlight module as described in any one of claims 1 to 28.

30. A display device, wherein: Comprising the display module as claimed in claim 29.

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