Backlight module, display module and display device

Abstract

The utility model 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, LCD displays have been introduced in many outdoor or semi-outdoor environments, such as gas stations, subway stations, and airports. These special environments place higher demands on display devices. For example, in situations with high ambient light levels, such as direct or oblique sunlight, current displays typically use a side-lit design with dual light bars to ensure brightness, in order to improve the display quality and enhance the brightness of the display itself.

[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 movement of the light guide plate, rubber strips are usually set at the four corners of the back panel to limit the movement of the light guide plate, or the non-light bar layer of the 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, different production batches will cause fluctuations in the initial design gap between the light guide plate and the light bar, 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 produce a certain amount of compression on the rubber strip due to its own weight or vibration when placed vertically, and the gap between the light guide plate and the light bar will change, which also causes large fluctuations in the brightness uniformity of the display device. Utility Model Content

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

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

[0006] A 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, and the adapter includes a first adapter plate. 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 image 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, and it 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 embodiments, a first connecting member is further included, the first connecting member including a first connecting portion and a second connecting portion connected to each other, the first connecting portion being located between the first adapter portion and the bottom plate, and the second connecting portion being 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, wherein 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 the side of the first adapter plate away from the base plate, the second clip is located on the side of the first connecting portion close to the base 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 embodiments, 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 posts corresponding one-to-one with the second holes, and the second posts 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 the size of the second hole along the first direction is the same as the 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 being located between the side plate and the light bar and 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 second adapter plate is made of metal.

[0025] In some possible implementations, a heat dissipation clip is further included. 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 facing away from the base 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 the side of the second adapter plate away from the bottom plate, the third heat dissipation plate is fixed to the side of the second adapter plate away from the light bar, 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 embodiments, 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, and 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 to the second connector.

[0032] 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 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 the side of the connecting plate away from the bottom plate.

[0034] In some possible implementation schemes, a sink is provided on a side of the first adapter plate facing the connecting plate, the connecting plate is provided with a position-avoiding groove, and the sink is located in the position-avoiding 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 dimension of the third hole along the second direction is larger than the dimension of the third hole along the first direction, and the fourth column is passed through 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 implementation schemes, 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 a 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 passed 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 facing 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, 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, where 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 via 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 adhesive layer includes a first adhesive portion and a second adhesive portion connected to each other, the first adhesive portion is bonded to the reflective sheet, the second adhesive portion is bonded to the light guide plate, the second adhesive portion is located between the first adhesive portion and the light bar, the orthographic projection of the first adhesive portion on the side panel and the orthographic projection of the second adhesive portion on the side panel at least partially overlap, and the size of the first adhesive portion in the third direction is smaller than the size of the second adhesive portion in the third direction; or,

[0055] The adhesive layer includes a first adhesive portion and a second adhesive portion connected to each other, the first adhesive portion is provided on a side of the first adapter plate away from the bottom plate, the reflective sheet is adhered to the first adhesive portion, the second adhesive portion is provided on a side of the first adhesive portion away from the first adapter plate, and 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 dimension of the first adhesive portion in the second direction is greater than a dimension of the second adhesive portion 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 implementations, the light bar includes 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;

[0058] The height of the limiting 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 and the limiting block are offset.

[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 the structure of the assembly of the adapter, light bar and light guide plate in this application;

[0068] Figure 3 A schematic diagram of the structure of the connection between the light bar and the adapter in this application;

[0069] Figure 4 A schematic diagram of a structure of the assembly of the adapter, light bar and first connecting member in this application;

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

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

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

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

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

[0075] Figure 10This is a structural diagram of the first adapter plate and the first connecting member in this application;

[0076] Figure 11 for Figure 10 A magnified schematic diagram of the structure at A in the middle;

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

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

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

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

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

[0082] Figure 17 This is another structural diagram of the position limiting between the first adapter and the back plate in this application;

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

[0084] Figure 19 for Figure 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] Figure 21 for Figure 20d A schematic diagram of the structure of the heat dissipation clip;

[0087] Figure 22 for Figure 21 Schematic diagram of part of the structure of the heat dissipation clip;

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

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

[0090] Figure 25 This is a schematic diagram of the overall structure of the light guide plate in this application;

[0091] Figure 26 A schematic diagram of the structure of the light guide plate and the back plate assembled in this application;

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

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

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

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

[0096] Figure 31 A schematic diagram of the structure of the assembly of the optical film and the back plate in this application;

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

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

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

[0100] Figure 35 This is a schematic diagram of the structure after the light bar and the light guide plate are assembled in this application;

[0101] Figure 36 This is a schematic diagram of a structure where the back of the bottom plate faces the light bar connector in this application;

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

[0103] Figure 38 For the first adapter board and Figure 37 A structural diagram of the light bar assembly;

[0104] Figure 39 This is a schematic diagram of the structure of the assembly of the light bar and the light guide plate in this application;

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

[0106] In the picture:

[0107] 100 - back panel; 110 - bottom panel; 110a - outer surface; 111 - third column; 112 - fourth column; 113 - opening; 120 - side panel; 120a - first side panel; 120b - second side panel; 121 - second slot; 130 - stopper; 130a - first stopper; 130b - second stopper; 1301 - first surface; 1311 - fourth slot; 1312 - ear bar; 1313 - fifth slot ;200-light bar;201-second connector;210-carrier board;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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0109] refer to Figure 1 The display module in this 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. The plurality of side panels 120 are sequentially connected end to end to form a receiving space with the bottom panel 110. The light bar 200, light guide plate 300, and 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 panels 120 is four. In addition, the display module in the present application can be applied to a single light bar 200 side-entry design or a dual light bar 200 side-entry design. When applied to a dual light bar 200 side-entry design, the two light bars 200 are respectively arranged near a set of two opposite side panels 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 a detailed description of the display module scheme in the present application, the following embodiments are described with respect to the light bar 200 and the related structures on one side. 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 fixes both the light guide plate 300 and the light bar 200 on the first adapter plate 410 by setting a 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. This can avoid fluctuations in the design gap between the light guide plate 300 and the light bar 200 caused by the manufacturing tolerances 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 3The adapter 400 may further include a first connector 401 connected to the first adapter plate 410, and the light bar 200 may include a second connector 201 connected to the side of the light bar 200 facing away from the light guide plate 300. The first connector 430 and the second connector 201 are engaged with each other. At this time, the first adapter plate 410 and the light bar 200 are relatively fixed via 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. For example, the first connector 401 may be a slot provided on the first adapter plate 410, with the opening of the slot facing the side plate 120, and the second connector 201 may be a T-shaped connector fixed to the light bar 200, which is engaged with the slot to fix the light bar 200 to the first adapter plate 410.

[0114] In some embodiments, reference Figure 4 The display module in the present application further includes a first connecting member 500, which may include a first connecting portion 510. The first connecting portion 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 connecting portion 510. In the present application, the first connecting portion 510 can be used to support the overall structure of the first adapter plate 410, the light guide plate 300, and the light bar 200, thereby making the overall structure more stable. In addition, the thickness of the first connecting portion 510 can be adjusted to meet the required height of 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 also 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 to the first connecting portion 510. The first connector 401 can be set at the position where the first connecting portion 510 protrudes from the first adapter plate 410 and is located on the side of the first connecting portion 510 facing away from the bottom plate 110. The second connector 201 is fixed to the side of the light bar 200 facing 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 connecting portion 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 this application also includes a first connector 500, which includes a second connector 520. The second connector 520 is fixed to the side of the light bar 200 facing away from the light guide plate 300. Since the second connector 520 is relatively fixed to the light bar 200, the structural strength of the light bar 200 is improved, thereby improving the fixation 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 panel 120 to ensure that the light guide plate 300 has sufficient expansion space when expanding.

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

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

[0119] The first connecting portion 510 and the second connecting portion 520 can be an integrated structure to ensure the overall structural stability of the first connecting member 500. Thus, when the light bar 200 and the first adapter plate 410 are both mounted on the first connecting member 500, the first adapter plate 400 not only supports the light bar 200, the first adapter plate 410, and the light guide plate 300, thereby improving the structural stability among the first adapter plate 410, the light bar 200, and the light guide plate 300, but also enhances the relative fixation between the light bar 200 and the light guide plate 300.

[0120] In the present application, the first connector 500 can be made of metal, and the light bar 200 can be attached to the second connector 520 using thermally conductive adhesive. In this case, the first connector 500 has excellent thermal conductivity, and the heat generated by the light bar 200 can be first transferred to the second connector 520, then from the second connector 520 to the first connector 510, and finally from the first connector 510 to the bottom plate 110, ultimately dissipating the heat outside the backplate 100. Due to the large contact area between the second connector 520 and the bottom plate 110, by making the first connector 500 also serve as a heat sink, the heat dissipation efficiency of the backlight module can be improved, which helps to reduce the temperature of the backplate 100.

[0121] Further, refer to Figure 7 An adhesive 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 adhered to the adhesive 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. This can increase the bonding area between the adhesive layer 411 and the light guide plate 300, 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. Furthermore, the reflective sheet 600 is fixed to the side of the first adapter plate 410 facing away from the bottom plate 110. With the first adapter plate 410 in place, the light bar 200, reflective sheet 600, and light guide plate 300 are all fixed to the first adapter plate 410, forming a single integrated assembly. This improves the structural stability of the assembly.

[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 base plate 110 and the orthographic projection of the second adhesive portion 4112 on the base 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. In this case, 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 the thickness of the reflective sheet 600. When the reflective sheet 600 is pasted on 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] Alternatively, as another optional embodiment, refer to Figure 9 The adhesive layer 411 may include a first adhesive portion 4111 and a second adhesive portion 4112 arranged along the Y direction, with the second adhesive portion 4112 located between the first adhesive portion 4111 and the light bar 300. The orthographic projection of the first adhesive portion 4111 on the side panel 120 at least partially overlaps with the orthographic projection of the second adhesive portion 4112 on the side panel 120, and the dimension of the first adhesive portion 4111 in the Z direction is smaller than the dimension 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 via 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 of the present application can be used in 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. To prevent the light guide plate 300 from displacing relative to the first adapter plate 410 during expansion, thereby reducing the bonding effect between the light guide plate 300 and the second adhesive layer 412, the expansion coefficient of the first adapter plate 410 can be made similar to that of the light guide plate 300. In this way, when the light guide plate 300 expands or contracts, the first adapter plate 410 can deform 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 can be 0.9 to 1.1, thereby ensuring that the first adapter plate 410 can expand or contract synchronously with the light guide plate 300. For example, the material of the first adapter plate 410 can 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 can be PC plastic, PVC material, etc.

[0130] Further, refer to Figure 10 , Figure 10 Only a partial structure of the first connecting member 500 in the X direction is shown, and it does not represent the entire first connecting member 500. The backlight module in this application also includes an elastic clip 700, which can be used to simultaneously clamp the first adapter plate 410 and the first connecting portion 510, thereby limiting the first adapter plate 410 and the first connecting portion 510 in the Z direction and preventing the first adapter plate 410 from deforming relative to the first connecting portion 510.

[0131] For details, please refer to Figure 11 and Figure 12 The elastic clip 700 may include a first clip 710 and a second clip 720 that are opposed 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 has an overall U-shaped structure. The first clip 710 is located on the side of the first adapter plate 410 that faces away from the first connection portion 510, while the second clip 720 is located on the side of the first connection portion 510 that faces the base plate 110 and is in contact with the surface of the first connection portion 510 that faces the base 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 preventing the first adapter plate 410 from freely expanding along the X direction on the first connection portion 510.

[0132] The width of the first adapter plate 410 along the Y direction can 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 clip 730 can also be in contact with 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 position of the first adapter plate 410 and the first connecting portion 510 in the Y direction, thereby ensuring the structural stability 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 to 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, and 0.25mm, so as to ensure that the elastic clip 700 has strength and elasticity.

[0134] In the present application, there may be one, two, or more elastic clips 700. 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 spaced and distributed at different locations of the first adapter plate 410 along the X direction. Figure 10 As shown, due to the provision of an adhesive layer 411 for securing the light guide plate 300, a certain distance exists between the light guide plate 300 and the first adapter plate 410. When the elastic clip 700 is clamped to 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 preventing interference with the light guide plate 300. In other words, the elastic clip 700 in this application is located on the side of the light guide plate 300 facing the base plate 110. Furthermore, when multiple elastic clips 700 are provided, the adhesive layer 411 can be segmented in the X-direction to ensure a gap between adjacent segments of the adhesive layer 411, facilitating the placement of the elastic clips 700.

[0135] It is worth noting that not only Figure 11 As shown, the first adapter plate 410 and the first connecting portion 510 are clamped by the elastic clip 700, thereby limiting 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 can 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 first adapter 400 to expand and contract relative to the first connecting member 500, corresponding limiting structures and positioning structures can also be set 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 Figure 10 and Figure 13 The first adapter plate 410 is provided with a first hole 413 in the middle portion along the X direction, and the first hole 413 penetrates the first adapter plate 410 along the Z direction. Correspondingly, the first connection portion 510 is provided with a first column 511 protruding from the surface of the first adapter plate 410 on the side facing the first adapter plate 410, and the first column 511 is penetrated by 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. For example, 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, refer to Figure 10 、 Figure 13 and Figure 14 Along the X-direction, the first adapter 400 may further include second holes 414 on either side of the first hole 413. The second holes 414 extend through the first adapter plate 410 along the Z-direction. The first connecting portion 510 includes second posts 512 corresponding one-to-one with the second holes 414. Each second post 512 is inserted into a second hole 414. The diameter of the second posts 512 is the same as that of the first posts 511. The size of the second hole 414 in the X-direction is larger than that of the first hole 413 in the X-direction. The size of the second hole 414 in the Y-direction is the same as that of the first hole 413 in the Y-direction. This facilitates positioning of the second posts 512 and the second holes 414 in the Y-direction.

[0139] As an optional embodiment, the first hole in this application can be a circular hole, and the second hole can be a racetrack-shaped hole. In this case, the length S1 of the second hole 414 along the X direction can be calculated based on the length L1 of the second hole 414 from the first hole 413 in the first adapter 400, thereby ensuring the expansion gap of the first adapter plate 410. In a specific implementation, S1 can be made to 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 product's operating or storage extreme temperature of -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 facilitate calculation of the length S1 of each second hole 414. In addition, the number of second holes 414 on each side of the first hole 413 can be designed according to actual needs. In other words, the number of second holes 414 on each side of the first hole 413 can be one, two, three, etc.

[0141] As previously mentioned, the adhesive layer 411 can be designed in sections. When the first hole 413 and the plurality of second holes 414 are provided, to prevent the first pillars 511 and the second pillars 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 implemented. This effectively limits the position of the first adapter 400 and the first connecting portion 510, and also ensures that the reflective sheet 600 is fixed to the first adapter 400.

[0142] In some embodiments, reference Figure 15 and Figure 16 At least one raised portion 415 is provided on the side of the first adapter plate 410 facing the side plate 120. The raised portion 415 is located on the side of the light bar 200 facing the side plate 120. When two or more raised portions 415 are provided, the plurality of raised portions 415 are spaced apart along the X-direction. A first groove 416 is provided on the side of the raised portion 415 facing the side plate 120, with the opening of the first groove 416 facing the side plate 120. Correspondingly, a third column 111 is provided on the bottom plate 110. The third column 111 is inserted into the first groove 416 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 engaged 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 the following requirements: 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 (the extreme temperature of -25°C during product operation or storage). 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, reference is made to Figure 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. A corresponding avoidance hole (not shown) is also provided on the first connecting portion 510, directly opposite the third hole 417. The avoidance hole has the same shape as the third hole 417. Correspondingly, the bottom plate 110 is provided with a fourth post 112, which passes through the avoidance hole and the third hole 417.

[0146] The third hole 417 can be, for example, a runway-shaped hole. In this case, the long axis of the third hole 417 extends along the Y direction, that is, the size of the third hole 417 along the Y direction is greater than its size 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 meet the following requirements: 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 of -25°C when the product is in operation or storage). Through the above design, by adding S3 on both sides, the expansion requirement of the light guide plate 300 in the Y direction can be met.

[0147] It is worth noting that in the aforementioned embodiments, Figure 17 As shown, both the first hole 413 and the third hole 417 are provided in the middle of the first adapter plate 410. In practice, the positions of the first hole 413 and the third hole 417 do not conflict. The middle of the first adapter plate 410 can be understood as the entire area extending a certain distance in both directions along the X-direction, centered symmetrically with the center of the first adapter plate 410. Therefore, when providing the first hole 413 and the second hole 417, their positions do not necessarily need to be the absolute center of the first adapter plate 410.

[0148] In some embodiments, reference Figure 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 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 via an 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 embodiment, the first adapter plate 410 and the second adapter plate 420 can be integrally formed. In this way, the adapter 400 not only provides support for the light guide plate 300 and the light bar 200, but also improves the stability of the backlight module. Alternatively, as another optional embodiment, the second adapter 400 can be made of metal, and the light bar 200 can be fixed to the second adapter 400. The heat generated by the light bar 200 can be transferred to the base plate 110 through the second adapter 400, thereby achieving excellent heat dissipation.

[0150] In this application, reference is made to Figure 18 and Figure 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. The bottom plate 110 is provided with a third column 111, which is inserted into 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. A certain gap is provided between the protrusion 415 and the side plate 120 to provide expansion space for the light guide plate 300.

[0151] About Figure 19 The positional relationship between the third column 111 and the first slot 416 can be referred to the above embodiment. Figure 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 can 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. Figure 16 In addition, the side of the protrusion 415 facing the back plate 120 can 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 can also protrude from the side surface of the second adapter plate 420 facing the back plate.

[0153] Furthermore, in this application, the adapter 400 can also be configured as described in the above embodiments and Figure 17 As described in the previous embodiment, a third hole 417 is provided in the middle of the first adapter 400, and a fourth post 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 post 112 can also be referred to in the description of the previous embodiment and will not be repeated here.

[0154] It is worth noting that in this application, except for the specific form 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 further provided. The heat dissipation clip 900 can be used to dissipate heat for the light bar 200.

[0156] Specifically, as an implementation scheme, refer to Figure 20a The heat dissipation clip 900 includes a first heat dissipation plate 910, which is located between the light bar 200 and the second adapter plate 420. For example, opposite sides of the first heat dissipation plate 910 can be fixed to the light bar 200 and the second adapter plate 420 respectively using adhesive, thereby securing the first heat dissipation plate 910. Heat generated during operation of the light bar 200 can be transferred to the first heat dissipation plate 910, thereby reducing the temperature of the light bar 200 and ensuring stable operation of the light bar 200.

[0157] As another embodiment, referring to Figure 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 facing away from the bottom plate 110. The first heat dissipation plate 910 and the second heat dissipation plate 920 are interconnected. For example, the two can be an integrated structure to improve the overall structural stability of the heat dissipation clip 900.

[0158] The first heat sink 910 can be secured to the light bar 200 and the second adapter plate 420 on opposite sides using adhesive, respectively. The second heat sink 920 can also be secured to the second adapter plate 420 using adhesive, thereby forming a relatively fixed integral structure between the heat sink 900, the light bar 200, and the second adapter plate 420. Heat generated by the light bar 200 is transferred to the first heat sink 910 and then to the second heat sink 920. This increases the heat dissipation area of ​​the heat sink 900, thereby improving heat dissipation efficiency.

[0159] As another embodiment, referring to Figure 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, which are 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 facing away from the bottom plate 110. The third heat dissipation plate 930 is located on the side of the second adapter plate 420 facing the side plate 120. For example, the first heat dissipation plate 910 may be secured to the light bar 200 and the second adapter plate 420 on opposite sides by adhesive, respectively. The second heat dissipation plate 920 may also be secured to the side of the second adapter plate 420 facing away from the bottom plate 110 by adhesive, and the third heat dissipation plate 930 may also be secured to the side of the second adapter plate 420 facing the side plate 120 by adhesive. Furthermore, a certain gap is provided between the third heat dissipation plate 930 and the side plate 120 to provide expansion clearance for the light guide plate 300.

[0160] Alternatively, the first heat sink 910, the second heat sink 920, and the third heat sink 930 can also be an integrated structure. Since the heat sink clip 900 is an overall U-shaped structure, the heat sink clip 900 can also be made of an elastic material so that the heat sink clip 900 is clamped to the second adapter plate 420, thereby fixing the heat sink clip 900 relative to the second adapter plate 420. In this case, the light bar 200 can be fixed to the first heat sink 910 using thermally conductive adhesive, thereby achieving effective heat conduction.

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

[0162] As another embodiment, referring to Figure 20d and Figure 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 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 facing away from the base plate 110 to ensure relative fixation between the heat dissipation clip 900 and the second adapter plate 420.

[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 facing away from the base plate 110. The third heat sink 930 is located on the side of the second adapter plate 420 facing away from the light bar 200. The fourth heat sink 940 is connected to the side of the third heat sink 930 facing away from the second heat sink 920 and can be attached to the base plate 110. The light bar 200 can be attached to the first heat sink 910 using thermally conductive adhesive. In this case, 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, ultimately transferring the heat away from the base plate 110. The provision of the fourth heat sink 940 attached to the base plate 120 can increase the contact area between the fourth heat sink 940 and the base plate 110, thereby improving the heat dissipation effect.

[0164] Alternatively, the first heat sink 910 can be secured to the light bar 200 and the second adapter plate 420 on opposite sides by adhesive, and the second heat sink 920 and the third heat sink 930 can also be secured to the second adapter plate 420 by adhesive. A gap is left between the fourth heat sink 940 and the side panel 120 to provide expansion space 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 may 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). The first limiting structure and the second limiting structure cooperate with each other to limit the position between the first adapter plate 410 and the bottom plate 110. The first limiting structure can be, for example, Figure 19 The protrusion 415 and the first groove 416 shown in FIG. 4 , the second limiting structure can be, for example, Figure 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 Figure 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 from 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 is not only applicable to Figure 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 movement of the bent edge limiter in the Y direction, which can easily cause scratches. Based on this, in the backlight module of the present application, after the first adapter 400, first connector 500, light guide plate 300, light bar 200, and reflector 600 are assembled to form a component, a limiting structure can be provided to limit the component's position to prevent significant displacement of the component within the backplate 100.

[0169] As described in the above embodiment, a first groove 416 is provided on the first adapter plate 410, and the third column 111 passing through the first groove 416 allows the assembly and the back plate 100 to be positioned. Figure 16 When the backlight module is in its initial state, the third pillar 111 is located in the middle of the first slot 416 along the X-direction. At this point, there is a certain gap between the third pillar 111 and the two opposing sidewalls of the first slot 416 along the X-direction. For example, the gap between the third pillar 111 and the sidewalls of the first slot 416 is 0.1 mm to 0.15 mm, limiting the module's movement relative to the backplate 100 in the X-direction to only 0.1 mm to 0.15 mm.

[0170] When limiting the position between the component and the back plate 100 in the Y direction, as an optional implementation scheme, refer to Figures 23 to 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, while 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. At least one limiting portion 130 is provided between the second groove 121 and the light guide plate 300. At least two first protrusions 310 are provided on the side of the light guide plate 300 facing the second side panel 120b. The at least two first protrusions 310 are arranged along the Y direction, and a third groove 320 is formed between any two adjacent first protrusions 310. In this application, an example is used in which one limiting portion 130 is provided between the second groove 121 and the light guide plate 300, and two first protrusions 310 are provided on the light guide plate 300.

[0171] The opening of the second slot 121 is not parallel to the opening of the third slot 320. Specifically, the opening of the second slot 121 is located on the side of the second side plate 120b facing away from the bottom plate 110, while the opening of the third slot 320 is located on the side of the first boss 310 facing the second side plate 120b. The limiting portion 130 is disposed through the third slot 320 to limit the position of the light guide plate 300 and the second side plate 120b.

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

[0173] It is understood 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, a certain gap is provided between the stopper 130 and the bottom wall of the third slot 320 along the X-direction to accommodate the expansion requirements of the light guide plate 300 in the X-direction. Specifically, when designing the gap S4 between the stopper 130 and the bottom of the third slot, S4 can satisfy the following requirement: 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 (the product's operating or storage temperature limit of -25°C). With this design, when the backlight module is designed with two light bars 200, adding the S4 values ​​on both sides can meet the reliable expansion requirements of the light guide plate 300 in the X-direction.

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

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

[0177] like Figure 29 、 Figure 30 as well as Figure 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 defines a fourth groove 1311 along the Z direction. A hook rib 1312 is disposed within the fourth groove 1311. Along the Y direction, the hook rib 1312 can be located in the middle of the fourth groove 1311. Correspondingly, the optical film 800 includes a second boss 810, which is provided with a hook hole 820. The hook hole 820 extends through the second boss 810 along the Z direction. The second boss 810 is located within the fourth groove 1311, and the hook rib 1312 is disposed through the hook hole 820.

[0178] Or, as Figure 27 、 Figure 28 as well as Figure 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, which defines a fifth groove 1313 along the Z direction. Correspondingly, the optical film 800 defines a third boss 830 located in the fifth groove 1313.

[0179] It is worth noting that, in the present application, the limiting portions 130 on both sides arranged along the X direction 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 Figure 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 to 0.15mm, which means that the movement of the optical film 800 in the X direction is limited to only 0.1mm to 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 to 0.15mm, thereby limiting the movement of the optical film 800 in the Y direction to only 0.1mm to 0.15mm. In this way, through the precise positioning design in the X and Y directions, the movement of the optical film 800 during vibration is controlled within 0.1mm to 0.15mm, which is conducive to improving the mechanical stability of the backlight module.

[0181] For reference Figure 34 Figure 35 , Figure 34Only a portion of the light bar structure in the X-direction is shown. The light bar 200 in this application may specifically include a carrier board 210, a plurality of lamp beads 220, at least one stopper 230, and a connector 240. The lamp beads 220, stopper 230, and connector 240 are all disposed on the side of the carrier board 210 facing the light guide plate 300. The lamp beads 220 are spaced apart, and the stopper 230 is disposed between adjacent lamp beads 220.

[0182] The height of the stop block 230 protruding from the carrier plate 210 is greater than the height of the lamp beads 220 protruding from the carrier plate 210, which can prevent the light guide plate 300 from colliding with the lamp beads 220 and causing damage to the lamp beads 220. Since the light bar 200 and the light guide plate 300 in this 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 stop block 230 can be offset. This can minimize the gap between the light guide plate 300 and the lamp beads 220, thereby improving the light input efficiency. For example, in a conventional light bar 200, the height of the lamp beads 220 is 0.6mm, and the height of the stop block 230 is 0.7mm. Through the above design, the gap between the light guide plate 300 and the lamp beads 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 beads 220 is 0.45mm. When this gap is reduced to 0.1mm, the light input efficiency can be increased from the original 84.3% to 95.2%, which shows that the light input efficiency has been significantly improved.

[0183] refer to Figure 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, the end of the light guide plate 300 close to the connector 240 is also provided with a avoidance structure for avoiding the connector. 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 gap 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 gap.

[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 Figure 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. The socket 241 is arranged toward the opening 113 so that the socket 241 can be connected to 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. 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 set on the outside of the back plate 100, the connector 240 is set inside the back plate 100 in this application, which can help reduce the overall height of the display module, thereby facilitating the realization of a lightweight and thin design of the product.

[0186] In some embodiments, reference Figure 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 this application also includes lamp beads 220, limit blocks 230 and connectors 240. The connection between the above-mentioned lamp beads 220, limit blocks 230 and connectors 240 and the carrier plate 210 can be referred to as Figure 34 The structure introduced in will not be repeated here.

[0187] For reference Figure 37 and Figure 38 The first adapter plate 410 is located on the side of the connecting plate 250 facing away from the bottom plate 100. A recessed platform 418 is provided on the side of the first adapter plate 410 facing the connecting plate 250. A retaining groove 251 is provided on the connecting plate 250 opposite the recessed platform 418. The retaining groove 251 can be set through the connecting plate 250 along the Z direction. The recessed platform 418 is located in the retaining groove 251 to facilitate positioning of the first adapter plate 410.

[0188] In this embodiment, when the backlight module is in its initial state, the sunken platform 418 is located in the middle of the avoidance groove 2111 along the X direction. At this time, a certain gap is maintained between the sunken platform 418 and the inner walls of the avoidance groove 251 on both sides of the X direction. Furthermore, a certain gap is also maintained between the end of the sunken platform 418 facing the second connecting plate 212 and the inner wall of the avoidance groove 251 along the Y direction.

[0189] For example, 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 limitation of the connecting plate 250 and the first adapter plate 410, the present application may also provide the following Figure 11 and Figure 12 The elastic clip 700 shown in FIG. 7 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, this application may also be as follows 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 connecting portion 520 is provided on the side of the carrier 210 away from the light guide plate 300. The material of the second connecting 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 provided between the connecting plate 250 and the base plate 110, and a second connecting portion 520 is provided on the side of the carrier plate 210 facing 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, further Figure 11 and Figure 12 When the elastic clip 700 is shown in FIG, the elastic clip 700 can simultaneously clamp the first connecting portion 510, the connecting plate 250 and the first adapter plate 410, so that the three are limited in the Z direction.

[0193] In some embodiments, reference Figure 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 the Figure 38The first adapter plate 410 is not located on the side of the connecting plate 250 facing away from the base plate 110 as shown in the figure. Instead, the first adapter plate 410 and the connecting plate 250 are an integrally injection-molded structure. In other words, the connecting plate 250 serves as both a part of the light bar 200 and the first adapter plate 410. In this case, the light guide plate 300 is fixed to the side of the connecting plate 250 facing away from the base plate 110.

[0194] Further, refer to Figure 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 are deformable. When the light guide plate 300 expands in the X or Y direction, it pushes the light bar 200 and compresses 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 panel 120 are provided with Figure 5 or Figure 6 The second connection portion 520 shown or Figure 18 When the second adapter plate 420 is shown, the L rubber strip abuts against the second connection 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 the backlight module introduced 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 this application not only reduce the fluctuation 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 may 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 such 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 intended to include such modifications and variations.

Claims

1. A backlight module, wherein: include: A 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: 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 plate 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, the elastic clip 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 the side of the first adapter plate away from the base plate, the second clip is located on the side of the first connecting portion close to the base 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 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.

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 posts corresponding to the second holes one by one, and the second posts 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 the size of the second hole along the first direction is the same as the size of the first hole along the first direction.

7. The backlight module according to claim 2, 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 facing 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 the side of the second adapter plate away from the bottom plate, the third heat dissipation plate is fixed to the side of the second adapter plate away from the light bar, 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, and the bottom plate is provided with a second limiting structure, 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 on a side away from the light guide plate, and the first connector is engaged 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 position-avoiding groove, and the sinking platform is located in the position-avoiding groove.

17. The backlight module according to claim 1, wherein: 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; 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 claim 1, 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 larger than the dimension of the third hole along the first direction, and the fourth column is passed through 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 claim 1, 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 claim 1, wherein: 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; 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 a 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 passed 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. 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 away from the bottom plate.

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, an ear hanging rib is provided in the fourth groove, 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, the optical film includes a third boss, and the third boss is located in the fifth groove.

25. The backlight module according to claim 1, 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 the side of the first adapter plate facing away from the bottom plate through the adhesive layer.

26. The backlight module according to claim 25, wherein: It also includes a reflective sheet, which is located between the light guide plate and the bottom plate; The adhesive layer includes a first adhesive portion and a second adhesive portion connected to each other, the first adhesive portion is bonded to the reflective sheet, the second adhesive portion is bonded to the light guide plate, the second adhesive portion is located between the first adhesive portion and the light bar, an orthographic projection of the first adhesive portion on the side panel and an orthographic projection of the second adhesive portion on the side panel at least partially overlap, and a dimension of the first adhesive portion in a third direction is smaller than a dimension of the second adhesive portion in the third direction; or, The adhesive layer includes a first adhesive portion and a second adhesive portion connected to each other, the first adhesive portion is provided on a side of the first adapter plate away from the bottom plate, the reflective sheet is adhered to the first adhesive portion, the second adhesive portion is provided on a side of the first adhesive portion away from the first adapter plate, and 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 dimension of the first adhesive portion in the second direction is greater than a dimension of the second adhesive portion 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 claim 1, wherein: The light bar includes a carrier plate, a plurality of lamp beads and at least one limit block, wherein the lamp beads and the limit 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 limit block is located between adjacent lamp beads; The height of the limiting 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 and the limiting block are offset.

28. The backlight module according to claim 27, wherein: The light bar further includes a connector, which 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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