Backlight module, display module and display device

Abstract

The utility model relates to the technical field of display equipment, 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 with the edge of the bottom plate, and the side plates and the bottom plate are matched to define a containing space; the light guide plate is located in the containing space, and a gap is formed between the side face of the light guide plate and the side plate; the light-emitting part is located in the containing space, and the light-emitting part comprises a flexible circuit board and a plurality of light sources; the flexible circuit board is located between the light guide plate and the bottom plate, the flexible circuit board comprises at least two light bar parts and a connecting part, the at least two light bar parts are arranged close to the side plates located on the different sides respectively, the extending direction of the light bar parts is the same as the extending direction of the side plates close to the light bar parts, and the at least two light bar parts are electrically connected through the connecting part; the light sources are arranged on the sides, away from the bottom plate, of the light bar parts and located between the side face of the light guide plate and the side plate. The backlight module can greatly improve the display brightness of the liquid crystal display module.

Description

Technical Field

[0001] This application relates to the technical field of display devices, and particularly to a backlight module, a display module, and a display device. Background Art

[0002] In the prior art, in the backlight module of a conventional liquid crystal display module, usually one light bar is used. The display brightness improvement solutions can be to increase the number of light-emitting diodes (LEDs) on the light bar, increase the current on the LEDs, or apply a high-brightness film material.

[0003] However, increasing the number of LEDs on a single light bar, increasing the current on the LEDs, or applying a high-brightness optical film material only makes the brightness improvement of the liquid crystal display module very limited, and cannot rival the display brightness of an organic light-emitting diode (OLED) display module. Summary of the Utility Model

[0004] This application provides a backlight module, a display module, and a display device, and the above-mentioned backlight module can greatly improve the display brightness of the liquid crystal display module.

[0005] To achieve the above object, this application provides the following technical solutions:

[0006] A backlight module, comprising:

[0007] A backplane, comprising a bottom plate and a plurality of side plates connected to the edge of the bottom plate, and the plurality of side plates cooperate with the bottom plate to enclose an accommodation space;

[0008] A light guide plate, located in the accommodation space, and there is a gap between the side surface of the light guide plate and the side plate;

[0009] A light-emitting member, located in the accommodation space, and the light-emitting member comprises a flexible circuit board and a plurality of light sources;

[0010] The flexible circuit board is located between the light guide plate and the bottom plate, and the flexible circuit board comprises at least two light bar portions and a connection portion. The at least two light bar portions are respectively arranged adjacent to the side plates on different sides, and the extending direction of the light bar portion is the same as the extending direction of the adjacent side plate. The at least two light bar portions are electrically connected through the connection portion;

[0011] The plurality of light sources are arranged on the side of each light bar portion facing away from the bottom plate, and the light sources are located between the side surface of the light guide plate and the side plate.

[0012] Optionally, the plurality of side plates include a first side plate and a second side plate arranged oppositely;

[0013] The flexible circuit board includes a first light bar portion and a second light bar portion. The first light bar portion is disposed adjacent to the first side plate, and the second light bar portion is disposed adjacent to the second side plate;

[0014] The connecting portion is connected between the first light bar portion and the second light bar portion.

[0015] Optionally, the flexible circuit board is in an "H" shape.

[0016] Optionally, the flexible circuit board is bonded to the bottom plate through a first bonding portion;

[0017] The first bonding portion includes a first tape and a second tape;

[0018] One of the light bar portions is bonded to the bottom plate through the first tape;

[0019] The connecting portion is bonded to the bottom plate through the second tape.

[0020] Optionally, a wiring groove opposite to the connecting portion is provided on one side of the back plate facing the light guide plate, and the connecting portion is routed in the wiring groove.

[0021] Optionally, at least one protruding reinforcing rib is provided on the side of the bottom plate facing away from the light guide plate.

[0022] Optionally, the orthographic projection of the wiring groove on the light guide plate is located within the orthographic projection of the reinforcing rib on the light guide plate.

[0023] Optionally, one edge of the light guide plate is bonded to the flexible circuit board through a second bonding portion.

[0024] Optionally, an optical film is further included, and the optical film is located on the side of the light guide plate facing away from the bottom plate;

[0025] The light guide plate has a light-emitting area and a non-light-emitting area provided around the light-emitting area;

[0026] The optical film includes a middle area and a plurality of edges provided around the middle area. The orthographic projection of the middle area of the optical film on the light guide plate covers the light-emitting area, and one edge of the optical film is connected to the non-light-emitting area of the light guide plate.

[0027] Optionally, a light-shielding portion is further included, and the light-shielding portion is located on the side of the optical film facing away from the light guide plate, and the orthographic projection of the light-shielding portion on the light guide plate covers the non-light-emitting area;

[0028] The first edge of the optical film is connected to the light guide plate through the light-shielding portion.

[0029] Optionally, the light shielding portion includes a light shielding tape and an isolation pad;

[0030] The light-shielding tape is located on a side of the isolation pad away from the light guide plate, and the orthographic projection of the light-shielding tape on the light guide plate covers the non-light-exiting area and the orthographic projection of the isolation pad on the light guide plate;

[0031] The isolation pad is non-sticky, and the orthographic projection of the isolation pad on the optical film covers the other edges of the optical film except the first edge.

[0032] Optionally, the isolation pad is black in color.

[0033] Optionally, the optical film material includes a diffusion sheet and two prism sheets stacked on the light guide plate;

[0034] Of the two prism sheets, one prism sheet has a micro-prism structure extending along a first direction, and the other prism sheet has a micro-prism structure extending along a second direction, wherein the second direction is perpendicular to the first direction;

[0035] The edge of the prism sheet adjacent to the light bar portion has a light blocking portion, and the light blocking portion is used to block the light emitted by the light source on the light bar portion from propagating along the extension direction of the micro-prism structure;

[0036] The orthographic projection of the light-shielding portion on the optical film material covers the light-blocking portion.

[0037] Optionally, the light blocking portion includes at least one indentation, and an extension direction of the indentation intersects both the first direction and the second direction.

[0038] Optionally, the light blocking portion includes two indentations, one of which is located on a side of the prism sheet facing the light guide plate, and the other is located on a side of the prism sheet away from the light guide plate, and the orthographic projections of the two indentations on the light guide plate do not overlap and do not intersect.

[0039] Optionally, a reflective sheet is further included, and the reflective sheet is located between the light guide plate and the flexible circuit board;

[0040] One edge of the reflection sheet is bonded to the bottom plate.

[0041] Optionally, it further comprises at least one camera hole, wherein the camera hole penetrates the bottom plate and the light guide plate, and the camera hole is arranged adjacent to at least one of the light bar portions;

[0042] The light source is not arranged in an area of the light bar portion adjacent to the camera hole and opposite to the camera hole.

[0043] Optionally, the light bar portion adjacent to the camera hole includes a first sub-light bar portion and a second sub-light bar portion;

[0044] The distance between the first sub-light bar portion and the second sub-light bar portion is a first distance, and the first distance is greater than the length of the camera hole along a third direction, where the third direction is the extending direction of the light bar portion adjacent to the camera hole.

[0045] The present application further provides a display module, including any one of the backlight modules provided in the above technical solutions.

[0046] The present application further provides a display device, including the display module provided in the above technical solutions.

[0047] The present application provides a backlight module, a display module, and a display device. The backlight module includes a backplane, a light guide plate, and a light-emitting member. The light guide plate and the light-emitting member are located in the accommodation space of the backplane. The light-emitting member includes a flexible circuit board and a plurality of light sources. The flexible circuit board is located between the light guide plate and the bottom plate of the backplane. Since the flexible circuit board includes at least two light bar portions, the at least two light bar portions are respectively arranged adjacent to the side plates on different sides. The plurality of light sources are arranged on the side of the at least two light bar portions facing away from the bottom plate, and the light sources are located between the side plate of the light guide plate and the side plate of the backplane. The flexible circuit board can provide a light-emitting signal for the plurality of light sources. The setting of at least two light bar portions in the light-emitting member can provide light sources for at least two sides of the light guide plate. Compared with the technical solution of a single light bar in the backlight module in the related art, the light-emitting brightness of the backlight module can be greatly improved, and further, the display brightness of the liquid crystal display module can be greatly improved. Description of the Drawings

[0048] Figure 1 It is a cross-sectional view of a liquid crystal display module in the related art;

[0049] Figure 2 It is a schematic plan view of a backlight module provided by an embodiment of the present application;

[0050] Figure 3 For Figure 2 The cross-sectional view along CC';

[0051] Figure 4 It is a schematic structural view of a flexible circuit board provided by an embodiment of the present application;

[0052] Figure 5 It is a schematic assembly view of a backplane and a flexible circuit board provided by an embodiment of the present application;

[0053] Figure 6 It is a schematic structural view of another flexible circuit board provided by an embodiment of the present application;

[0054] Figure 7 For Figure 3Enlarged view of region E;

[0055] Figure 8 is Figure 2 Cross-sectional view along GG’ in;

[0056] Figure 9 Another schematic diagram of the assembly of the backplane and the flexible circuit board provided by the embodiment of the present application;

[0057] Figure 10 Another schematic diagram of the assembly of the backplane and the flexible circuit board provided by the embodiment of the present application;

[0058] Figure 11 is Figure 2 Cross-sectional view along DD’ in;

[0059] Figure 12 is Figure 3 Enlarged view of region F in;

[0060] Figure 13 Schematic diagram of the structure of a light-shielding portion provided by the embodiment of the present application;

[0061] Figure 14 Schematic diagram of the whole isolation pad provided by the embodiment of the present application;

[0062] Figure 15 Schematic diagram of the composite structure of the whole isolation pad and the light-shielding tape provided by the embodiment of the present application;

[0063] Figure 16 Schematic diagram of the structure of a light-shielding portion provided by the embodiment of the present application;

[0064] Figure 17 Schematic diagram of the structure of a prism sheet provided by the embodiment of the present application;

[0065] Figure 18 is Figure 3 Enlarged view of region F in;

[0066] Figure 19 Schematic diagram of the fabrication of a prism sheet provided by the embodiment of the present application;

[0067] Figure 20 Schematic diagram of the structure of a backlight module provided by the embodiment of the present application;

[0068] Figure 21 Schematic diagram of the structure of a display module provided by the embodiment of the present application;

[0069] Figure 22 is Figure 21 Enlarged view of region M in.

[0070] Icon:

[0071] 01 - Backlight module; 011 - Backplane; 012 - Light guide plate; 013 - Light bar; 0131 - Light source; 014 - Reflector; 015 - Optical film; 016 - Light-shielding tape; 02 - Liquid crystal display panel; 016 - Lower polarizer

[0072] 1 - Backplane; 11 - Bottom plate; 111 - Wiring groove; 112 - Reinforcing rib; 12 - Side plate; 121 - First side plate; 122 - Second side plate; 2 - Light guide plate; 3 - Light-emitting component; 31 - Flexible circuit board; 311 - Light bar part; 3111 - First light bar part; 3112 - Second light bar part; a - First sub-light bar part; b - Second sub-light bar part; 312 - Connection part; 32 - Light source; 41 - First tape; 42 - Second tape; 43 - Third tape; 44 - Fourth tape; 45 - Fifth tape; 5 - Reflector; 6 - Optical film; 61 - Diffuser; 62 - Prism sheet; 621 - Lower prism sheet; 622 - Upper prism sheet; 7 - Light-shielding part; 71 - Light-shielding tape; 72 - Spacer; 8 - Rubber frame; 9 - Edge-sealing tape; 601 - Dimple; O - Camera hole

[0073] 100 - Backlight module; 200 - Liquid crystal display panel; 300 - Cover plate; 400 - Mold Detailed implementation manners

[0074] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0075] In the related art, the cross-sectional view and partial enlarged view of the liquid crystal display module are as Figure 1 shown. Specifically, the liquid crystal display module includes a backlight module 01 and a liquid crystal display panel 02 located on the light-emitting side of the backlight module 01. The backlight module 01 includes a backplane 011, a light guide plate 012, a light bar 013, a reflector 014, an optical film 015, a light-shielding tape 016, etc. Among them, Figure 1 the bottom of the liquid crystal display module has a light bar 013 ( Figure 1 as shown in the enlarged view of area A in Figure 1 ), and the top of the liquid crystal display module has no light bar (

[0076] To improve the display brightness of a liquid crystal display module, conventional solutions can include increasing the number of light-emitting diodes (LEDs) 0131 on the light bar 013, increasing the current on the LEDs, or applying high-brightness optical films. For example, increasing the number of LEDs on a single light bar from 16 to 18 results in a brightness gain of 12.5%; increasing the current applied to the LEDs from 20 mA to 21 mA results in a brightness gain of 5%; replacing ordinary optical films with high-brightness optical films results in a brightness gain of 5% to 10%. However, the current maximum brightness of a liquid crystal display module can be 800 nits. Compared with the brightness of an organic electroluminescent display module being above 1500 nits, simply increasing the number of LEDs on a single light bar, increasing the current on the LEDs, or applying high-brightness optical films only results in a very limited increase in the brightness of the liquid crystal display module, and it cannot rival the display brightness of an organic electroluminescent display module.

[0077] To solve the above technical problems, an embodiment of the present application provides a backlight module, as Figure 2 and Figure 3 shown, Figure 2 is a schematic plan view of a backlight module provided by an embodiment of the present application; Figure 3 is Figure 2 a cross-sectional view along CC' in

[0078] The backplane 1 includes a bottom plate 11 and a plurality of side plates 12 connected to the edge of the bottom plate 11. The plurality of side plates 12 cooperate with the bottom plate 11 to enclose an accommodation space;

[0079] The light guide plate 2 is located in the accommodation space, and there is a gap between the side surface of the light guide plate 2 and the side plate 12;

[0080] The light-emitting component 3 is located in the accommodation space. The light-emitting component 3 includes a flexible circuit board 31 and a plurality of light sources 32;

[0081] The flexible circuit board 31 is located between the light guide plate 2 and the bottom plate 11. The flexible circuit board 31 includes at least two light bar portions 311 and a connection portion 312. The at least two light bar portions 311 are respectively arranged adjacent to the side plates 12 on different sides, and the extending direction of the light bar portion 311 is the same as the extending direction of the adjacent side plate 12. The at least two light bar portions 311 are electrically connected through the connection portion 312; as Figure 4 shown, Figure 4 is a schematic structural view of a flexible circuit board 31 provided by an embodiment of the present application;

[0082] The plurality of light sources 32 are arranged on the side of each light bar portion 311 facing away from the bottom plate 11, and the light sources 32 are located between the side surface of the light guide plate 2 and the side plate 12.

[0083] In the backlight module provided by the embodiment of the present application, it includes a back plate 1, a light guide plate 2, and a light emitting component 3. The light guide plate 2 and the light emitting component 3 are located in the accommodation space of the back plate 1. The light emitting component 3 includes a flexible circuit board 31 and a plurality of light sources 32. The flexible circuit board 31 is located between the light guide plate 2 and the bottom plate 11 of the back plate 1. Since the flexible circuit board 31 includes at least two light bar portions 311, and the at least two light bar portions 311 are respectively arranged adjacent to the side plates 12 on different sides. The plurality of light sources 32 are arranged on the side of each light bar portion 311 away from the bottom plate 11, and the light sources 32 are located between the side plate 12 of the light guide plate 2 and the side plate 12 of the back plate 1. The flexible circuit board 31 can provide a light emitting signal for the plurality of light sources 32. Setting at least two light bar portions 311 in the light emitting component 3 can provide light sources 32 for at least two sides of the light guide plate 2. Compared with the technical solution of a single light bar in the backlight module in the related art, it can greatly improve the light output brightness of the backlight module, and further can greatly improve the display brightness of the liquid crystal display module.

[0084] Specifically, the above backlight module can form a liquid crystal display module with a liquid crystal display panel located on the light output side of the backlight module, and this liquid crystal display module can be applied to display devices such as mobile phones, tablets, and laptop computers.

[0085] In the embodiment of the present application, the shape of the bottom plate 11 of the back plate 1 can be rectangular, then the back plate 1 can include four side plates 12 connected to the edges of the bottom plate 11, and the four side plates 12 cooperate with the bottom plate 11 to enclose an accommodation space, as Figure 5 shown, Figure 5 is an assembly diagram of a back plate 1 and a flexible circuit board 31 provided by the embodiment of the present application; the light guide plate 2 is arranged in the accommodation space, and there is a gap between the four side surfaces of the light guide plate 2 and the four side surfaces of the back plate 1.

[0086] Optionally, in the backlight module, the shape of the bottom plate 11 can also be other polygons, and the number of side plates 12 of the back plate 1 is equal to the number of side edges of the bottom plate 11, which is not limited here and is determined according to the actual situation.

[0087] In the embodiment of the present application, the flexible circuit board 31 can have two light bar portions 311, and the two light bar portions 311 can be respectively arranged adjacent to two different side plates 12, as Figure 4 and Figure 5 shown, which can greatly improve or double the light output brightness of the backlight module, and further can improve the display brightness of the liquid crystal display module.

[0088] As Figure 5As shown, a plurality of side plates 12 of the backplane 1 may include a first side plate 121 and a second side plate 122 that are oppositely arranged; the flexible circuit board 31 includes a first light bar portion 3111 and a second light bar portion 3112. The first light bar portion 3111 may be arranged adjacent to the first side plate 121, and the second light bar portion 3112 may be arranged adjacent to the second side plate 122; the connecting portion 312 is connected between the first light bar portion 3111 and the second light bar portion 3112.

[0089] Specifically, the first side plate 121 may be located at the top of the backlight module; the second side plate 122 may be located at the bottom of the backlight module. The first light bar portion 3111 and the second light bar portion 3112 in the flexible circuit board 31 are respectively arranged adjacent to the first side plate 121 and the second side plate 122. As Figure 5 shown, compared with the related art, it is equivalent to adding a light bar at the top of the backlight module, which can greatly improve the light output brightness of the backlight module.

[0090] Moreover, when the first light bar portion 3111 and the second light bar portion 3112 of the flexible circuit board 31 are respectively located at the top and bottom of the backlight module, the assembly structure on the left and right sides of the backlight module is basically not changed, and thus the narrow bezel design on the left and right sides of the display device can be not affected.

[0091] It should be noted that the top of the backlight module specifically refers to: the area where the backlight module is located at the top of the display device when the display device is in normal use; the bottom of the backlight module specifically refers to: the area where the backlight module is located at the bottom of the display device when the display device is in normal use; the left and right sides of the backlight module specifically refer to: the areas where the backlight module is located on the left and right sides of the display device when the display device is in normal use.

[0092] In addition, as Figure 5 shown, since there is a certain distance between the first light bar portion 3111 and the second light bar portion 3112 of the flexible circuit board 31, when the light sources 32 arranged on the first light bar portion 3111 and the second light bar portion 3112 work, the heat on the flexible circuit board 31 can be made not concentrated, and thus the heat dissipation effect of the flexible circuit board 31 can be ensured, and the heat dissipation of the backlight module is basically not affected; moreover, since the flexible circuit board 31 is arranged between the light guide plate 2 and the bottom plate 11 of the backplane 1, the light output effect of the backlight module is not affected. Compared with the one - shaped light bar in the related art, the area of the flexible circuit board 31 can be designed to be larger, and thus the heat conduction area can be increased, and the heat dissipation speed of the flexible circuit board 31 can be accelerated.

[0093] In the embodiment of the present application, as Figure 4 and Figure 5As shown, the flexible circuit board 31 can be in an "H" shape, that is, the middle regions of the first light bar portion 3111 and the second light bar portion 3112 are connected by a straight connecting portion 312 to achieve electrical connection between the first light bar portion 3111 and the second light bar portion 3112. The "H"-shaped flexible circuit board 31 structure design can have a larger area compared to the straight-shaped flexible circuit board 31 (FPC) in a conventional light bar, and thus can increase the heat dissipation area. For example, in an actual application scenario, the area of the straight-shaped light bar in the related art can be about 130 mm 2 , while the area of the "H"-shaped flexible circuit board 31 in the embodiment of the present application can be about 540 mm 2 .

[0094] Optionally, the flexible circuit board 31 can also be in other shapes, which are not limited here and are determined according to the actual situation. For example, the end of the first light bar portion 3111 and the end of the second light bar portion 3112 are connected by the connecting portion 312 to achieve electrical connection between the first light bar portion 3111 and the second light bar portion 3112, as Figure 6 shown, Figure 6 which is a schematic structural diagram of a flexible circuit board 31 provided in the embodiment of the present application.

[0095] Specifically, the flexible circuit board 31 further includes a plug-in end, as Figure 4 , Figure 5 and Figure 6 shown; the flexible circuit board 31 can be connected to the control module of the display device through the plug-in end, and the control module can provide a light-emitting signal for the light source 32 on the flexible circuit board 31. The plug-in end can be connected to one light bar portion 311. For example, as Figure 4 , Figure 5 and Figure 6 shown, the plug-in end can be connected to the second light bar portion 3112.

[0096] In the embodiment of the present application, during the process of assembling the light-emitting component 3 onto the backplane 1, the flexible circuit board 31 of the light-emitting component 3 can be bonded to the bottom plate 11 through the first bonding portion to ensure the fixation of the light-emitting component 3.

[0097] Specifically, the first bonding portion can include a first tape 41 and a second tape 42, as Figure 7 shown, Figure 7 is Figure 3Enlarged view of the middle region E; in the flexible circuit board 31, a light bar portion 311 is bonded to the bottom plate 11 through a first tape 41, and a connection portion 312 is bonded to the bottom plate 11 through a second tape 42. During the temperature change process, the flexible circuit board 31 will expand and contract thermally. Only bonding the light bar portion 311 and the connection portion 312 to the bottom plate 11, and not bonding other regions to the bottom plate 11, can enable the flexible circuit board 31 to remain stretched during the thermal expansion and contraction process, avoid the problem of wrinkles in the flexible circuit board 31, and ensure the flatness of the components in the backlight module.

[0098] Among them, both the first tape 41 and the second tape 42 are double-sided tapes; in order to ensure the fixation of the light-emitting component 3, the thicknesses of the first tape 41 and the second tape 42 may be different. The thickness of the first tape 41 is greater than the thickness of the second tape 42, which can ensure the fixed connection between the light bar portion 311 and the bottom plate 11.

[0099] Specifically, as Figure 3 and Figure 7 shown, in the flexible circuit board 31, the first light bar portion 3111 can be bonded to the bottom plate 11 through the first tape 41, that is, the light bar portion 311 at the top of the flexible circuit board 31 in the backlight module is fixedly bonded to the bottom plate 11. Optionally, in the flexible circuit board 31, other light bar portions 311 can also be bonded to the bottom plate 11 through the first tape 41, which is not limited here and depends on the actual situation.

[0100] Optionally, the first bonding portion can also only have the first tape 41, and only one light bar portion 311 is bonded to the bottom plate 11 through the first tape 41, which can enable the flexible circuit board 31 to remain stretched in the backplane 1 and ensure the flatness of the components in the backlight module. The specific structure of the first bonding portion can be not limited here and depends on the actual situation.

[0101] As Figure 1 shown, in the related art, the light bar 031 is pasted to the positions of the light guide plate 012 and the glue frame 017 through a light bar glue of a common plastic (PET) substrate. Among them, the light bar glue and the light guide plate 012 are both plastic materials, and the thermal conductivity coefficient of the plastic material is 0.15 - 0.24 W / mK, with low thermal conductivity efficiency and poor thermal conductivity effect, which easily leads to poor heat dissipation effect of the backlight module when the LED emits light.

[0102] To solve the problem of low heat conduction efficiency of the plastic light bar glue, in the embodiments of the present application, the material of the first bonding part can be set as a high heat conduction material; specifically, the thermal conductivity of the first bonding part can be greater than or equal to 0.6W / mK. A large thermal conductivity can enhance the heat dissipation effect of the backlight module. When the light source 32 on the light bar part 311 of the flexible circuit board 31 emits light, the heat on the light source 32 is transferred to the back plate 1 through the flexible circuit board 31 and the first bonding part. The material of the back plate 1 is a heat-conducting metal material, and the heat dissipation area of the back plate 1 is relatively large, and the heat in the local area where the light source 32 is located on the flexible circuit board 31 can be quickly transferred out of the backlight module by means of radiation or conduction.

[0103] Specifically, the material of the above-mentioned first bonding part can be a high heat conduction tape based on glass fiber. Optionally, the first bonding part can also be other materials with a high thermal conductivity, which is not limited here and depends on the actual situation.

[0104] In the embodiments of the present application, in order to better assemble the light-emitting part 3 onto the back plate 1, the side of the back plate 1 facing the light guide plate 2 can have a wiring groove 111 opposite to the connecting part 312 of the flexible circuit board 31. The connecting part 312 can be routed in the wiring groove 111, as Figure 8 shown Figure 8 is Figure 3 the cross-sectional view along GG' in, where the enlarged view of area J is the structural schematic diagram of the bottom plate 11 at the wiring groove 111. When assembling the light-emitting part 3 onto the back plate 1, the connecting part 312 of the flexible circuit board 31 can be aligned with the wiring groove 111, improving the assembly efficiency of the backlight module; and, setting the wiring groove 111 on the bottom plate 11 can avoid the influence of the connecting part 312 on the assembly of other components of the backlight module.

[0105] Specifically, as Figure 8 shown, when the bottom plate 11 has the wiring groove 111, the second tape 42 in the first bonding part can be pasted on the bottom of the wiring groove 111, and the connecting part 312 of the flexible circuit board 31 is routed in the wiring groove 111.

[0106] In actual application scenarios, the size of the mobile phone module is constantly increasing. For example, it increases from 5.0 inches to 6.8 inches. Correspondingly, the size of the back plate in the backlight module is also increasing. Conventional back plates can be made of stainless steel plates with a thickness of about 0.1 mm. The bottom surface of the back plate is designed as a flat surface. The larger the flat surface area of the back plate 1, the greater the warpage of the back plate 1 will be, which will further cause an increase in the defective rate of the backlight module. The flatness tolerance of the conventional backlight module is about +0.05 / -0.25 mm.

[0107] In the embodiments of the present application, the side of the bottom plate 11 facing away from the light guide plate 2 can have at least one protruding reinforcing rib 112, as Figure 8As shown; the reinforcing ribs 112 can enhance the overall strength of the backplane 1, improve the flatness of the backplane 1, and have a simple structure and are easy to manufacture, without the need to replace the material of the backplane 1 or increase the manufacturing cost of the backplane 1.

[0108] It should be noted that the height, width of the above-mentioned reinforcing ribs 112, and the shape of the reinforcing ribs 112 can be not limited here and are determined according to the actual situation. For example, the height of the reinforcing ribs 112 can be about 0.14 mm, the width of the reinforcing ribs 112 can be about 2.74 mm, and the backplane 1 with the reinforcing ribs 112 can control the flatness tolerance of the backlight module within about +0.05 mm / -0.1 mm.

[0109] Specifically, the extending direction of the reinforcing ribs 112 can be the arrangement direction of the top and bottom of the backlight module. To further enhance the overall strength of the backplane 1, the reinforcing ribs 112 on the bottom plate 11 can be set to two or more, etc., and the reinforcing ribs 112 can also be designed in a non-linear shape. For example, the orthographic projection of the reinforcing ribs 112 on the bottom plate 11 is in a stepped shape.

[0110] In the embodiment of the present application, the orthographic projection of the wiring groove 111 on the light guide plate 2 can be located within the orthographic projection of the reinforcing ribs 112 on the light guide plate 2, which can avoid the design of the wiring groove 111 from affecting the overall strength of the backplane 1.

[0111] Specifically, the structure of the backplane 1 can be formed by stamping a metal plate. The thickness of the backplane 1 can be about 0.1 mm, or it can also be other thicknesses, which are not limited here and are determined according to the actual situation. The reinforcing ribs 112 on the bottom plate 11 are also formed by a stamping process, so that the wiring groove 111 can be formed on the side of the bottom plate 11 facing the light guide plate 2, and the reinforcing ribs 112 can be formed on the side of the bottom plate 11 facing away from the light guide plate 2.

[0112] As Figure 9 and Figure 10 shown, Figure 9 and Figure 10 are schematic diagrams of the assembly structure of the flexible circuit board 31 and the backplane 1 provided by the embodiment of the present application. As Figure 9 shown, there can be two reinforcing ribs 112 on the bottom plate 11 of the backplane 1, that is, there are two wiring grooves 111 corresponding to the bottom plate 11, which can enhance the overall strength and flatness of the backplane 1. The connecting portion 312 of the flexible circuit board 31 can route in one wiring groove 111. As Figure 10As shown, the orthographic projection of the reinforcing rib 112 on the bottom plate 11 of the backplane 1 is step-shaped on the bottom plate 11. The reinforcing rib 112 is designed as a non-linear shape, that is, there is a non-linear wiring groove 111 corresponding to the bottom plate 11, which can improve the overall strength and flatness of the backplane 1. The connecting part 312 of the flexible circuit board 31 can be routed in the non-linear wiring groove 111.

[0113] In the embodiment of the present application, during the assembly of the light guide plate 2 and the light-emitting component 3, one edge of the light guide plate 2 can be bonded to the flexible circuit board 31 through the second bonding part. During the temperature change process, the light guide plate 2 will expand and contract thermally. Only one edge of the light guide plate 2 is bonded to the flexible circuit board 31, which can ensure that the light guide plate 2 remains stretched during the thermal expansion and contraction process, and avoid the problem of the light guide plate 2 being wrinkled.

[0114] Specifically, the edge of the light guide plate 2 adjacent to the first side plate 121 can be bonded to the flexible circuit board 31 through the second bonding part, that is, the edge of the light guide plate 2 located at the top of the backlight module is fixedly bonded to the flexible circuit board 31, as Figure 11 shown. Figure 11 For Figure 3 is the cross-sectional view along DD' in, where the enlarged view of area H is the structural schematic diagram of the top of the backlight module. Optionally, it can also be designed that the edge of the light guide plate 2 adjacent to other side plates 12 is bonded to the flexible circuit board 31, which is not limited here and depends on the actual situation.

[0115] Among them, the second bonding part can be the third tape 43, and the third tape 43 is a double-sided tape.

[0116] In the embodiment of the present application, the backlight module further includes a reflector 5, and the reflector 5 is located between the light guide plate 2 and the flexible circuit board 31, as Figure 3 , Figure 7 and Figure 11 shown; the reflector 5 can totally reflect the light irradiated towards the bottom plate 11 in the light guide plate 2, which can enhance the light output brightness of the backlight module; as Figure 11 shown, one edge of the reflector 5 can be bonded to the bottom plate 11 through the third bonding part; during the temperature change process, the reflector 5 will expand and contract thermally. Only one edge of the reflector 5 is bonded to the bottom plate 11, which can ensure that the reflector 5 remains stretched during the thermal expansion and contraction process, and avoid the problem of the reflector 5 being wrinkled.

[0117] Specifically, the edge of the reflector 5 adjacent to the first side plate 121 can be bonded to the bottom plate 11, that is, the edge of the reflector 5 located at the top of the backlight module is fixedly bonded to the bottom plate 11, as Figure 11 shown. Optionally, it can also be designed that the edge of the reflector 5 adjacent to other side plates 12 is bonded to the bottom plate 11, which is not limited here and depends on the actual situation.

[0118] Among them, the third bonding portion may be a fourth tape 44, and the fourth tape 44 is a double-sided tape.

[0119] In the embodiment of the present application, the backlight module further includes an optical film 6, and the optical film 6 is located on the side of the light guide plate 2 away from the bottom plate 11, as Figure 7 and Figure 12 shown, Figure 12 is Figure 3 an enlarged view of area F in ; among them, the light guide plate 2 has a light-emitting area and a non-light-emitting area arranged around the light-emitting area. The optical film 6 includes a middle area and a plurality of edges arranged around the middle area. The orthographic projection of the middle area of the optical film 6 on the light guide plate 2 covers the light-emitting area, and one edge of the optical film 6 can be connected to the non-light-emitting area of the light guide plate 2. The optical film 6 will expand and contract during temperature changes. Only one edge of the optical film 6 is connected to the light guide plate 2, which can ensure that the optical film 6 remains stretched during the process of expansion and contraction, and avoid the problem of wrinkles in the optical film 6.

[0120] Specifically, the edge of the optical film 6 adjacent to the first side plate 121 can be connected to the light guide plate 2, that is, the edge of the optical film 6 at the top of the backlight module is connected to the light guide plate 2; optionally, it can also be designed that the edge of the optical film 6 adjacent to other side plates 12 is connected to the light guide plate 2, which is not limited here and is determined according to the actual situation.

[0121] In the embodiment of the present application, the backlight module further includes a light-shielding portion 7. The light-shielding portion 7 is located on the side of the optical film 6 away from the light guide plate 2, and the orthographic projection of the light-shielding portion 7 on the light guide plate 2 covers the non-light-emitting area. The first edge of the optical film 6 can be connected to the light guide plate 2 through the light-shielding portion 7, as Figure 7 and Figure 12 shown. The light-shielding portion 7 can block the light in the non-light-emitting area of the light guide plate 2, avoid light leakage at the edge of the display device, and ensure the display effect of the display device.

[0122] Specifically, the first edge of the optical film 6 can be the edge of the optical film 6 adjacent to the first side plate 121 of the back plate 1. Connecting the first edge of the optical film 6 to the light guide plate 2 through the light-shielding portion 7 can ensure the stretching of the optical film 6 and avoid the problem of wrinkles in the optical film 6.

[0123] In the related art, as Figure 1As shown in the figure, in the backlight module 01, a light-shielding tape 016 is used to shield the non-light-emitting area of the light guide plate 012. The light-shielding tape 016 can be a double-sided tape. The light-shielding tape 016 is attached to the side of the optical film 015 facing away from the light guide plate 012. One side of the light-shielding tape 016 causes the four peripheral edges of the optical film 015 to bond with the non-light-emitting area of the light guide plate 012, and it is impossible to connect only one edge of the optical film 015 to the light guide plate 012. In this way, the optical film 015 cannot be freely stretched; and the other side of the light-shielding tape 016 will bond with the lower polarizer 021 on the light-incident side of the liquid crystal display panel 02; and due to the different shrinkage ratios of the lower polarizer 021 and the optical film 015, and the different expansion and contraction amounts of the lower polarizer 021 and the optical film 015 caused by the change of environmental test temperature and humidity, the shrinkage of the lower polarizer 021 will cause the light-shielding tape 016 to restrict the optical film 015, resulting in poor wrinkling of the optical film 015.

[0124] To solve the above problems, in the embodiments of the present application, the light-shielding part 7 can include a light-shielding tape 71 and a spacer 72, as Figure 7 、 Figure 12 and Figure 13 shown, Figure 13 is a schematic structural diagram of a light-shielding part 7 provided by the embodiments of the present application; wherein, the light-shielding tape 71 is located on the side of the spacer 72 facing away from the light guide plate 2, and the orthographic projection of the light-shielding tape 71 on the light guide plate 2 covers the non-light-emitting area and the orthographic projection of the spacer 72 on the light guide plate 2; the spacer 72 has no adhesiveness, and the orthographic projection of the spacer 72 on the optical film 6 covers the other edges of the optical film 6 except the first edge.

[0125] In the above light-shielding part 7, since there is a spacer 72 between the light-shielding tape 71 and the optical film 6, the spacer 72 covers the other edges of the optical film 6 except the first edge, the light-shielding tape 71 is a double-sided tape, the spacer 72 has no adhesiveness, one side of the spacer 72 contacts the optical film 6, and the other side bonds with the light-shielding tape 71. In this way, the light-shielding tape 71 can be bonded only to the first edge of the optical film 6 and the light guide plate 2, and not to the other edges of the optical film 6. Furthermore, only the first edge of the optical film 6 can be connected to the light guide plate 2 through the light-shielding part 7. Therefore, during the environmental test, the optical film 6 can be freely stretched and will not be wrinkled due to the light-shielding tape 71 restricting the optical film 6 caused by the shrinkage of the lower polarizer.

[0126] Specifically, the material of the above spacer 72 can be a plastic material (PET), or other materials, which are not limited here and are determined according to the actual situation.

[0127] Among them, the color of the above spacer 72 can be black, which can ensure the light-shielding effect of the light-shielding part 7.

[0128] Specifically, the manufacturing process of the light-shielding portion 7 can be as follows: First, a whole isolation pad 72 is cut out. The length of the isolation pad 72 is L1, and the width is W1. The actual cutting size accuracy can be accurate to within 0.05 mm, such as Figure 14 shown; Second, the whole isolation pad 72 is attached to the whole light-shielding tape 71 to form a composite material of the isolation pad 72 and the light-shielding tape 71, such as Figure 15 shown; Then, based on the outer contour of the isolation pad 72, the outer contour of the light-shielding tape 71 is cut out. The length of the light-shielding tape 71 is L2, and the width is W2. L2 is greater than L1, and W2 is greater than W1; Finally, the composite material is punched out with a light-emitting hole based on the outer contour of the isolation pad 72. The light-emitting hole is opposite to the light-emitting area of the light guide plate 2. The length of the light-emitting hole is L3, and the width is W3. L3 is less than L1, and W3 is less than W1, such as Figure 16 shown, Figure 16 which is a schematic structural diagram of a light-shielding portion 7 provided by an embodiment of the present application.

[0129] For example, L1 = 157.47 mm, W1 = 69.17 mm, L2 = 161.87 mm, W2 = 70.55 mm, L3 = 156.67 mm, W3 = 68.65 mm; In actual applications, the actual manufacturing accuracy of L1, W1, L2, W2, L3, and W3 controlled within + / - 0.05 mm can meet the assembly requirements of the optical film 6.

[0130] In the embodiment of the present application, the optical film 6 may include a diffusion sheet 61 and two prism sheets 62 stacked in sequence on the light guide plate 2; the two prism sheets 62 include a lower prism sheet 621 and an upper prism sheet 622 stacked. The diffusion sheet 61 can make the backlight module emit light evenly, and the prism sheet 62 can improve the light-emitting brightness of the backlight module.

[0131] To realize the connection between the first edge of the optical film 6 and the light guide plate 2, as Figure 7 and Figure 12 shown, the isolation pad 72 isolates the other edges of the diffusion sheet 61, the lower prism sheet 621, and the upper prism sheet 622 except the first edge from the light-shielding tape 71. The first edge of the diffusion sheet 61 can extend out from below the two prism sheets 62, so that the first edge of the diffusion sheet 61 is bonded to the light-shielding tape 71 through the fourth bonding portion. The first edge of the upper prism sheet 622 is directly bonded to the light-shielding tape 71, and the two ends of the first edge of the lower prism sheet 621 are bonded to the light-shielding tape 71. And the light-shielding tape 71 is bonded to the non-light-emitting area of the light guide plate 2, thereby realizing the fixation of the light-shielding tape 71 to the optical film 6.

[0132] Among them, the above-mentioned fourth bonding portion can be a fifth tape 45, and the fifth tape 45 is a double-sided tape.

[0133] In the above optical film 6, since the upper prism lens 622 is closest to the light-shielding tape 71, if the light-shielding tape 71 is bonded to all the edges of the upper prism lens 622, the shrinkage of the light-shielding tape 71 is most likely to cause poor wrinkling of the upper prism lens 622. In the embodiment of the present application, since the isolation pad 72 is provided in the light-shielding portion 7, the light-shielding tape 71 can be bonded only to the first edge of the upper prism lens 622. During the environmental test, the upper prism lens 622 can stretch freely and will not be wrinkled due to the shrinkage of the lower polarizer causing the light-shielding tape 71 to restrict the upper prism lens 622.

[0134] Specifically, among the two prism lenses 62 of the optical film 6, one prism lens 62 has a microprism structure extending in the first direction, and the other prism lens 62 has a microprism structure extending in the second direction. The second direction is perpendicular to the first direction. The two prism lenses 62 can improve the light output brightness of the backlight module through the microprism structure.

[0135] In the backlight module, since the light source 32 provided on the flexible circuit board 31 is located between the light guide plate 2 and the side plate 12, the light emitted by the light source 32 will not only enter the light guide plate 2 from the side of the light guide plate 2, but may also be transmitted to the middle area of the optical film 6 along the extension direction of the microprism structure from the edges of the two prism lenses 62. The middle area of the optical film 6 faces the display area of the liquid crystal display panel, which may cause the problem of the edge of the display area of the liquid crystal display panel being bright.

[0136] To solve this problem, in the embodiment of the present application, the edge of the prism lens 62 adjacent to the lamp bar portion 311 may have a light-blocking portion for blocking the light emitted by the light source 32 on the lamp bar portion 311 from propagating along the extension direction of the microprism structure. The orthographic projection of the light-shielding portion 7 on the optical film 6 covers the light-blocking portion. The light-blocking portion can block the light emitted by the light source 32 from propagating along the microprism structure on the prism lens 62 to the middle area of the optical film 6, thereby avoiding the problem of the edge of the display area of the liquid crystal display panel being bright.

[0137] Specifically, the light-blocking portion may include at least one indentation 601, and the extension direction of the indentation 601 intersects both the first direction and the second direction. As Figure 17 shown, Figure 17 is a schematic structural diagram of a prism lens 62 provided by an embodiment of the present application. As Figure 18 shown, Figure 18 is Figure 3 an enlarged view of the F area in Figure 18The light (as shown by the straight line with an arrow in the figure) propagates from the edge of the prism sheet 62 along the extension direction of the micro-prism structure to the middle area of the optical film material 6, which can avoid the problem of brightening at the edge of the display area of the liquid crystal display panel.

[0138] The light blocking portion may include one indentation 601 , or may include two or more indentations 601 , which is not limited here and depends on actual conditions.

[0139] Specifically, the light blocking portion may include two indentations 601, wherein one indentation 601 is located on the side of the prism sheet 62 facing the light guide plate 2, and the other indentation 601 is located on the side of the prism sheet 62 facing away from the light guide plate 2, and the orthographic projections of the two indentations 601 on the light guide plate 2 do not overlap and do not intersect, as shown in FIG. Figure 17 and Figure 18 shown.

[0140] Since the thickness of the prism sheet 62 is relatively thin, if a notch 601 is provided at the edge of the prism sheet 62 near the light bar portion 311, in order to effectively destroy the micro-prism structure, the notch 601 may need to have a relatively deep depth, which may cause the edge of the prism sheet 62 to be broken, causing damage to the overall structure of the prism sheet 62. However, notches 601 are provided on both sides of the edge of the prism sheet 62 near the light bar portion 311, and the orthographic projections of the two notches 601 on the light guide plate 2 do not overlap, which can effectively destroy the micro-prism structure at the edge of the prism sheet 62 and reduce the depth of the notch 601, thereby preventing the prism sheet 62 from being broken.

[0141] Specifically, in the above-mentioned light blocking portion, the two indentations 601 may be arranged in parallel or in non-parallel, which is not limited here and depends on the actual situation.

[0142] Specifically, the indentation 601 on the edge of the prism sheet 62 can be formed by die stamping. Figure 19 As shown, Figure 19 A schematic diagram of the production of a prism sheet 62 is provided in an embodiment of the present application. The prism sheet 62 needs to be cut and formed by a mold 400. It only needs to set a strip protrusion at a corresponding position on the mold 400 to press out the required indentation 601 on the edge of the prism sheet 62, without adding any steps or cutting and punching costs.

[0143] In the present application embodiment, Figure 7 As shown, the first edge of the diffuser 61 is bonded to the shading tape 71 of the shading portion 7 by the fifth tape 45. The fifth tape 45 may be an opaque tape. The fifth tape 45 may block the light emitted by the light source 32 on the first light strip portion 3111 from irradiating the first edge of the prism sheet 62. Therefore, the first edge of the prism sheet 62 may not be provided with a dent 601. The edge of the diffuser 61 adjacent to the second light strip portion 3112 does not have an adhesive tape, as shown in FIG.Figure 18 As shown, the light rays emitted by the light source 32 on the second light bar portion 3112 will irradiate the edge of the prism sheet 62. Therefore, the edge of the prism sheet 62 adjacent to the second light bar portion 3112 needs to have a dent 601 to prevent the light rays emitted by the light source 32 on the second light bar portion 3112 from propagating along the micro - prism structure to the middle area of the optical film 6.

[0144] In the embodiment of the present application, the backlight module may further include at least one camera hole O. The camera hole O penetrates through the bottom plate 11 and the light guide plate 2, and the camera hole O is arranged adjacent to at least one light bar portion 311; in the area of the light bar portion 311 adjacent to the camera hole O opposite to the camera hole O, the light source 32 may not be provided. For example, Figure 20 as shown, Figure 20 is a schematic structural diagram of a backlight module provided by an embodiment of the present application.

[0145] Specifically, the camera hole O may penetrate through the backlight module, that is, the camera hole O may penetrate through the bottom plate 11, the reflective sheet 5, the light guide plate 2, and the optical film 6. A camera may be arranged in the camera hole O. The light rays emitted by the light source 32 on the light bar portion 311 adjacent to the camera hole O cannot penetrate the camera in the camera hole O and enter the light guide plate 2. Therefore, in the area of the light bar portion 311 adjacent to the camera hole O opposite to the camera hole O, the light source 32 may not be provided, which can reduce the setting of the light source 32 while keeping the light output brightness of the backlight module unchanged, and can reduce the heat on the flexible circuit board 31 when the light source 32 emits light, which is beneficial to the heat dissipation of the flexible circuit board 31.

[0146] In the embodiment of the present application, for example, Figure 20 as shown, the light bar portion 311 adjacent to the camera hole O may include a first sub - light bar portion a and a second sub - light bar portion b; the distance between the first sub - light bar a and the second sub - light bar portion b is a first distance P1, and the first distance P1 is greater than the length P2 of the camera hole O in the third direction. The third direction is the extension direction of the light bar portion 311 adjacent to the camera hole O, which can reduce the number of light sources 32 on the light bar portion 311, and further can reduce the heat on the flexible circuit board 31 when the light source 32 emits light, which is beneficial to the heat dissipation of the flexible circuit board 31.

[0147] Specifically, for example, Figure 20 as shown, the camera hole O may be arranged adjacent to the first light bar portion 3111. In the area of the first light bar portion 3111 opposite to the camera hole O, the light source 32 may not be provided, so that the first light bar portion 3111 may include a first sub - light bar portion a and a second sub - light bar portion b. The distance between the first sub - light bar portion a and the second sub - light bar portion b is a first distance P1, and the first distance P1 may be greater than the length P2 of the camera hole O in the extension direction of the first light bar portion 3111, which can reduce the heat dissipated when the light source 32 on the first light bar portion 3111 works, and is beneficial to the heat dissipation of the flexible circuit board 31.

[0148] Optionally, the light bar portion disposed adjacent to the camera hole O may also be other light bar portions other than the first light bar portion 3111, which is not limited herein and is determined according to actual situations.

[0149] Specifically, as Figure 20 shown, multiple light sources 32 on the first light bar portion 3111 are arranged along the extending direction of the first light bar portion 3111. The area of the first light bar portion 3111 opposite to the camera hole O may be a vacant area, and light sources 32 may not be provided in the vacant area, so that the multiple light sources 32 on the first light bar portion 3111 are arranged at unequal intervals. For example, on both sides of the vacant area on the first light bar portion 3111 are a first sub-light bar portion a and a second sub-light bar portion b respectively. The multiple light sources 32 on the first sub-light bar portion a may be arranged at equal intervals, and the distance between the centers of two adjacent light sources 32 on the first sub-light bar portion a may be P1. The multiple light sources 32 on the second sub-light bar portion b are also arranged at equal intervals, and the distance between the centers of two adjacent light sources 32 on the second sub-light bar portion b may be P3. And the distance between the centers of two light sources 32 on the first light bar portion 3111 located on both sides of the vacant area may be P4, and P4 is greater than P3.

[0150] Specifically, when the second light bar portion 3112 and the first light bar portion 3111 on the flexible circuit board 31 are oppositely arranged, the multiple light sources 32 on the second light bar portion 3112 are arranged along the extending direction of the second light bar portion 3112. The multiple light sources 32 on the second light bar portion 3112 may be arranged at equal intervals, and the distance between the centers of two adjacent light sources 32 may be equal to P3 or may not be equal to P3, which is not limited herein and is determined according to actual situations. Or, the multiple light sources 32 on the second light bar portion 3112 may also be arranged at unequal intervals, which is not limited herein and is determined according to actual situations.

[0151] In the embodiment of the present application, as Figure 12 shown, the backlight module further includes a rubber frame 8. The rubber frame 8 may be fixedly connected to the inner side of the side plate 12. The rubber frame 8 and the side of the multiple side plates 12 facing away from the bottom plate 11 may cooperate to form a support surface for supporting the liquid crystal display panel. The light-shielding portion 7 may be located on the side of the support surface facing away from the bottom plate 11, and the edge of the light-shielding tape 71 of the light-shielding portion 7 may be adhered to the support surface.

[0152] In the embodiment of the present application, as Figure 7 shown, the backlight module may further include a wrapping tape 9. The wrapping tape 9 overlaps with the outer edge of the light-shielding tape 71 and wraps around the outside of the back plate 1, and can fix the edge of the light-shielding tape 71.

[0153] Among them, the thickness of the wrapping tape 9 may be about 0.03 mm or may be other thicknesses, which is not limited herein and is determined according to actual situations.

[0154] An embodiment of the present application further provides a display module, including any one of the backlight modules 100 provided in the above technical solutions.

[0155] Specifically, the display module further includes a liquid crystal display panel 200, and the liquid crystal display panel 200 is located on the light-emitting side of the backlight module 100, as Figure 21 shown. Figure 21 is a cross-sectional view of a display module provided by an embodiment of the present application. Among them, the enlarged view of area M is a schematic structural diagram of the top of the display module, and the enlarged view of area N is a schematic structural diagram of the bottom of the display module; the liquid crystal display panel 200 may include an array substrate, a color filter substrate, and a liquid crystal layer. The color filter substrate is located on the side of the array substrate facing away from the backlight module, and the liquid crystal layer is located between the array substrate and the color filter substrate. A lower polarizer is provided on the side of the array substrate facing the backlight module, and an upper polarizer is provided on the side of the color filter substrate facing away from the array substrate. The polarization direction of the upper polarizer is perpendicular to the polarization direction of the lower polarizer. Among them, the lower polarizer can be bonded to the light-shielding tape 71 in the backlight module.

[0156] Among them, the liquid crystal display panel has a display area AA and a non-display area BB disposed around the display area AA. The orthographic projection of the light-shielding portion 7 on the liquid crystal display panel is located in the non-display area BB, as Figure 22 shown. Figure 22 is Figure 21 the enlarged view of area M in

[0157] Specifically, the display module may further include a cover plate 300 located on the side of the liquid crystal display panel 200 facing away from the backlight module.

[0158] Specifically, the structure assembled at the top of the display module may be as Figure 22 shown. Figure 22The gap design between the components at the top of the display module is shown. Among them, the distance from the light source 32 on the first light bar part 3111 to the first side plate 121 is D1. D1 can be 0.3 mm or other spacings, depending on the actual situation; the width of the light source 32 is D2. D2 can be 0.5 mm or other dimensions, depending on the actual situation; the distance from the light source 32 on the first light bar part 3111 to the first edge of the diffusion sheet 61 is D3. D3 can be 0.15 mm or other distances, depending on the actual situation; the overlapping width of the fifth tape 45 and the first edge of the diffusion sheet 61 is D4. D4 can be 0.4 mm or other dimensions, depending on the actual situation; the distance from the fifth tape 45 to the prism sheet 62 is D5. D5 can be 0.2 mm or other distances, depending on the actual situation; the distance from the first edge of the prism sheet 62 to the inner edge of the light-shielding tape 71 is D6. D6 can be 0.42 mm or other distances, depending on the actual situation; the distance from the inner edge of the light-shielding tape 71 to the display area of the liquid crystal display panel is D7. D7 can be 0.23 mm or other distances, depending on the actual situation.

[0159] An embodiment of the present application further provides a display device, including the display module provided in the above technical solution.

[0160] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A backlight module, wherein, Comprising: A backplane, including a bottom plate and a plurality of side plates connected to the edge of the bottom plate, and the plurality of side plates cooperate with the bottom plate to enclose an accommodation space; A light guide plate, located within the accommodation space, with a gap between the side surface of the light guide plate and the side plates; A light emitting component, located within the accommodation space, and the light emitting component includes a flexible circuit board and a plurality of light sources; The flexible circuit board is located between the light guide plate and the bottom plate. The flexible circuit board includes at least two light bar portions and a connecting portion. The at least two light bar portions are respectively arranged adjacent to the side plates on different sides, and the extending direction of the light bar portion is the same as the extending direction of the adjacent side plate. The at least two light bar portions are electrically connected through the connecting portion; The plurality of light sources are arranged on the side of each light bar portion facing away from the bottom plate, and the light sources are located between the side surface of the light guide plate and the side plates.

2. The backlight module according to claim 1, wherein, The plurality of side plates include a first side plate and a second side plate arranged opposite to each other; The flexible circuit board includes a first light bar portion and a second light bar portion. The first light bar portion is arranged adjacent to the first side plate, and the second light bar portion is arranged adjacent to the second side plate; The connecting portion is connected between the first light bar portion and the second light bar portion.

3. The backlight module according to claim 2, wherein, The flexible circuit board is in an "H" shape.

4. The backlight module according to any one of claims 1 to 3, wherein, The flexible circuit board is adhered to the bottom plate through a first adhesive portion; The first adhesive portion includes a first tape and a second tape; One light bar portion is adhered to the bottom plate through the first tape; The connecting portion is adhered to the bottom plate through the second tape.

5. The backlight module according to any one of claims 1 to 4, wherein, On the side of the backplane facing the light guide plate, there is a wiring groove opposite to the connecting portion, and the connecting portion runs in the wiring groove.

6. The backlight module according to claim 5, wherein, On the side of the bottom plate facing away from the light guide plate, there is at least one protruding reinforcing rib.

7. The backlight module according to claim 6, wherein, The orthographic projection of the wiring groove on the light guide plate is located within the orthographic projection of the reinforcing rib on the light guide plate.

8. The backlight module according to any one of claims 1-7, wherein, One edge of the light guide plate is adhered to the flexible circuit board through a second adhesive portion.

9. The backlight module according to any one of claims 1-8, wherein, It further includes an optical film material, and the optical film material is located on the side of the light guide plate facing away from the bottom plate; The light guide plate has a light emitting area and a non-light emitting area arranged around the light emitting area; The optical film material includes a middle area and a plurality of edges arranged around the middle area. The orthographic projection of the middle area of the optical film material on the light guide plate covers the light emitting area, and one edge of the optical film material is connected to the non-light emitting area of the light guide plate.

10. The backlight module according to claim 9, wherein, It further includes a light shielding portion, and the light shielding portion is located on the side of the optical film material facing away from the light guide plate, and the orthographic projection of the light shielding portion on the light guide plate covers the non-light emitting area; The first edge of the optical film material is connected to the light guide plate through the light shielding portion.

11. The backlight module according to claim 10, wherein, The light shielding portion includes a light shielding tape and an isolation pad; The light shielding tape is located on the side of the isolation pad facing away from the light guide plate, and the orthographic projection of the light shielding tape on the light guide plate covers the non-light emitting area and the orthographic projection of the isolation pad on the light guide plate; The isolation pad has no adhesiveness, and the orthographic projection of the isolation pad on the optical film material covers the other edges of the optical film material except the first edge.

12. The backlight module according to claim 11, wherein, The color of the isolation pad is black.

13. The backlight module according to any one of claims 10-12, wherein, The optical film material comprises a diffusion sheet and two prism sheets stacked on the light guide plate; Of the two prism sheets, one prism sheet has a micro-prism structure extending along a first direction, and the other prism sheet has a micro-prism structure extending along a second direction, wherein the second direction is perpendicular to the first direction; The edge of the prism sheet adjacent to the light bar portion has a light blocking portion, and the light blocking portion is used to block the light emitted by the light source on the light bar portion from propagating along the extension direction of the micro-prism structure; The orthographic projection of the light-shielding portion on the optical film material covers the light-blocking portion.

14. The backlight module according to claim 13, wherein, The light blocking portion includes at least one indentation, and an extending direction of the indentation intersects both the first direction and the second direction.

15. The backlight module according to claim 14, wherein, The light blocking portion includes two indentations, one of which is located on the side of the prism sheet facing the light guide plate, and the other is located on the side of the prism sheet away from the light guide plate, and the orthographic projections of the two indentations on the light guide plate do not overlap and do not intersect.

16. The backlight module according to any one of claims 1-15, wherein, Also included is a reflective sheet, the reflective sheet being located between the light guide plate and the flexible circuit board; One edge of the reflection sheet is bonded to the bottom plate.

17. The backlight module according to any one of claims 1-16, wherein, Also comprising at least one camera hole, the camera hole passes through the bottom plate and the light guide plate, and the camera hole is arranged adjacent to at least one of the light bar portions; The light source is not arranged in an area of the light bar portion adjacent to the camera hole and opposite to the camera hole.

18. The backlight module according to claim 17, wherein, The light bar portion adjacent to the camera hole includes a first sub-light bar portion and a second sub-light bar portion; A distance between the first sub-light bar portion and the second sub-light bar portion is a first distance, and the first distance is greater than a length of the camera hole along a third direction, and the third direction is an extension direction of the light bar portion adjacent to the camera hole.

19. A display module, wherein, Comprising the backlight module as described in any one of claims 1-18.

20. A display device, wherein, Comprising the display module as claimed in claim 19.

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