Backlight module and display device

Abstract

The utility model relates to the technical field of display, in particular to a backlight module and a display device, which are used for reducing assembly deviation of the backlight module. The embodiment of the utility model provides a backlight module. The backlight module comprises a back plate, a light guide plate and a light bar. The back plate is provided with a first groove; the first groove includes a bottom wall and a plurality of side walls. The plurality of sidewalls includes a first sidewall and a plurality of second sidewalls. The light guide plate is located in the first groove and provided with a light-out face and a light-in face. The light-emitting surface is located on the side, away from the bottom wall, of the light guide plate and is opposite to the first side wall. The light bar is located between the light guide plate and the first side wall. The back plate comprises a first positioning part located on the side, close to the second side wall, of the first side wall. The first positioning part comprises a first sub-part and a second sub-part which are connected with each other; the first sub-part is connected with the first side wall. The first sub-part abuts against one end of the light bar, and the second sub-part abuts against a part of the light incident surface of the light guide plate. The backlight module and the display device are used for image display.

Description

Technical Field

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

[0002] At present, display devices have become an indispensable electronic product in people's lives. Various display devices such as medical display equipment, mobile phones, tablet computers and laptops have greatly increased the convenience of people's lives. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to reduce the assembly deviation of the backlight module, improve the light output efficiency of the backlight module, and reduce the power consumption of the display device.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides the following technical solutions:

[0005] The utility model provides a backlight module, which includes: a back plate, a light guide plate and a light bar. The back plate has a first groove. The first groove includes a bottom wall and a plurality of side walls connected to the bottom wall. The plurality of side walls include a first side wall and a plurality of second side walls. The light guide plate is located in the first groove, and the light guide plate has a light emitting surface and a light incident surface connected to the light emitting surface. The light emitting surface is located on a side of the light guide plate away from the bottom wall, and the light incident surface is arranged opposite to the first side wall. The light bar is located between the light guide plate and the first side wall. The back plate also includes: a first positioning portion. The first positioning portion is located on a side of the first side wall close to the second side wall. The first positioning portion includes: a first sub-portion and a second sub-portion connected to each other. The first sub-portion is connected to the first side wall. The first sub-portion abuts against one end of the light bar, and the second sub-portion abuts against a part of the light incident surface of the light guide plate.

[0006] Some embodiments of the utility model provide a backlight module, which includes a back panel, a light guide plate and a light bar, wherein the light guide plate is located in a first groove of the back panel, the light emitting surface of the light guide plate is located on a side of the light guide plate away from the bottom wall of the back panel, the light incident surface of the light guide plate is arranged opposite to the first side wall of the back panel, and the light bar is located between the light guide plate and the first side wall, wherein the back panel includes a first positioning portion, the first positioning portion is connected to the first side wall of the back panel, the first sub-portion of the first positioning portion abuts the light bar, and the second sub-portion of the first positioning portion abuts a part of the light incident surface of the light guide plate, thereby, the light bar and the light guide plate are fixed by using the first positioning portion, so that the assembly deviation of the back panel of the backlight module and the light guide plate and the light bar can be small, so that the back panel and the light guide plate and the light bar are fixed more firmly, thereby improving the light emitting efficiency of the backlight module, reducing the power consumption of the display device, avoiding the relative movement of the back panel, the light guide plate and the light bar caused by the movement of the backlight module during the assembly process, and avoiding affecting the light emitting efficiency of the backlight module during the working process.

[0007] In some embodiments, the plane where the second sub-portion is located is parallel to the plane where the first side wall is located. The plane where the first sub-portion is located and the plane where the second sub-portion is located have an included angle.

[0008] In some embodiments, the back plate further comprises: a second positioning portion connected to the bottom wall, the second positioning portion protruding along the bottom wall in a direction pointing toward the light guide plate, the second positioning portion being parallel to the first side wall, and the second positioning portion abutting against the light guide plate.

[0009] In some embodiments, the back panel further includes: a first opening located on the bottom wall. The second positioning portion and the first side wall are located on opposite sides of the first opening. The light bar includes: a base, and a connector located at one end of the base and connected to the base. The connector is located within the first opening as an orthographic projection of the plane where the bottom wall is located. The backlight module further includes: a light circuit board. The light circuit board is connected to the connector via the first opening and extends to a surface of the bottom wall on one side away from the light guide plate.

[0010] In some embodiments, the backlight module further comprises: a plurality of buffers. The buffers are located on the side of two adjacent side walls close to the light guide plate and on the side of the bottom wall close to the light guide plate. The buffers have a limiting portion, and the limiting portion is located between the light guide plate and the side walls.

[0011] In some embodiments, the buffer member further comprises a supporting portion connected to the limiting portion. The backlight module further comprises: a reflecting plate located between the bottom wall and the light guide plate. The bottom wall comprises: a reinforcing portion protruding toward the light guide plate. The supporting portion is located between the reflecting plate and the bottom wall, and between the reinforcing portion and the side wall.

[0012] In some embodiments, the plurality of buffers are configured to satisfy at least one of the following conditions: the plurality of buffers include a first buffer, which is located on one side of the adjacent first side wall and the second side wall. The first buffer abuts against the end face of the second positioning portion away from the first side wall. The plurality of buffers include a second buffer, which is located on one side of the adjacent first side wall and the second side wall. A portion of the limiting portion of the second buffer is also located between the second side wall and the first positioning portion. The plurality of buffers include at least one third buffer, which is located on one side of two adjacent second side walls. The limiting portion of the third buffer includes a first sub-limiting portion and a second sub-limiting portion that are connected to each other. The first sub-limiting portion is located on the side of the light guide plate away from the light bar, and the first sub-limiting portion is interference fit with the light guide plate.

[0013] In some embodiments, the back plate further comprises: a plurality of limiting members. The second side wall is connected to at least one of the limiting members. The backlight module further comprises: an optical film group located on the light guide plate away from the bottom wall. The optical film group comprises a plurality of protrusions. One of the protrusions is located in one of the limiting members.

[0014] In some embodiments, the limiting member includes: a limiting sub-member, the limiting sub-member is located on a side of the second side wall close to the light guide plate. The limiting sub-member is provided with a second groove, the protrusion extends into the second groove, and there is a gap between the protrusion and the inner wall of the second groove.

[0015] In some embodiments, the plurality of second side walls include: a third side wall and a fourth side wall connected to the first side wall and arranged opposite to each other. The back plate further includes: a plurality of mounting portions. The mounting portion passes through the third side wall or the fourth side wall. The mounting portion has a blind hole, and the entrance of the blind hole is located on a side of the second side wall away from the light guide plate.

[0016] In some embodiments, the back plate further comprises: a third positioning portion connected to the bottom wall. The third positioning portion is located on a side of the bottom wall away from the light guide plate. The third positioning portion is configured to be clamped with a display circuit board of the display panel.

[0017] In some embodiments, the back panel further comprises: a second opening and at least one third opening located on the bottom wall. The second opening is used to transmit a near field communication signal. The third opening is used for positioning during the processing of the back panel. And / or, the light guide plate comprises: a main body and at least one side reflection portion. The main body has the light emitting surface and the light incident surface. The side reflection portion is located on the side of the main body and does not overlap with the light incident surface of the main body.

[0018] In some embodiments, the backlight module further includes: a plastic frame. The plastic frame includes a supporting portion and a peripheral plate that are interconnected. The supporting portion is located on a side of the light guide plate away from the bottom wall, and the peripheral plate surrounds the outside of the side wall of the back plate. The peripheral plate includes: at least one avoidance portion and a first sub-plate located outside the first side wall. The avoidance portion is connected to the first sub-plate, and the avoidance portion is recessed in a direction from the first sub-plate to the first side wall. The flexible circuit board of the display device extends to the non-light-emitting side of the backlight module through the avoidance portion. Wherein, the width of the portion of the flexible circuit board located in the avoidance portion is less than or equal to the width of the avoidance portion; and / or, the recessed depth of the avoidance portion is greater than or equal to the thickness of the flexible circuit board.

[0019] In some embodiments, the back plate further comprises: a plurality of first buckle parts. The first buckle parts are connected to a surface of a side of the side wall away from the light guide plate and protrude in a direction away from the side wall. The plastic frame further comprises: a plurality of second buckle parts connected to the peripheral plate. The second buckle parts are buckled with the first buckle parts.

[0020] In some embodiments, the back panel further includes: a plurality of first snap-on portions. The first snap-on portion is connected to a surface of a side of the side wall away from the light guide plate, and protrudes in a direction away from the side wall. The backlight module further includes: a front frame. The front frame at least surrounds the rubber frame. The front frame includes: a plurality of side panels parallel to the side walls of the back panel, and at least one third snap-on portion connected to the side panels. The third snap-on portion includes a fourth opening and a snap-on portion, and the snap-on portion is recessed in a direction from the side panel to the side wall. The orthographic projection of the first snap-on portion of the back panel on the side panel is located in the fourth opening. The snap-on portion abuts against the first snap-on portion.

[0021] In some embodiments, the front frame further includes: a bending portion. The bending portion is connected to a side plate parallel to the first side wall of the back plate, and is connected to an end of the side plate close to the non-light emitting side of the backlight module. The bending portion is bent in a direction close to the non-light emitting side of the backlight module.

[0022] The embodiment of the utility model further provides a display device, the display device comprising: a backlight module, a display panel, and a display circuit board. The backlight module is a backlight module as described in any one of the above embodiments, and the display panel is located on the light-emitting side of the backlight module. The display circuit board is located on the non-light-emitting side of the backlight module; and a flexible circuit board is connected to the display panel and the display circuit board.

[0023] The beneficial effects that can be achieved by the display device provided in some embodiments of the present invention are the same as the beneficial effects that can be achieved by the backlight module provided in some of the above embodiments, and will not be described in detail here.

[0024] In some embodiments, the display device further includes: a buffer ring, a first adhesive layer, a shading portion, a second adhesive layer and a protective film. The buffer ring is located between the rubber frame of the backlight module and the display panel. The first adhesive layer is located between the buffer ring and the display panel. The shading portion extends from the side plate of the front frame through the bending portion to the non-light-emitting side of the backlight module, and the shading portion covers the flexible circuit board and the display circuit board; the second adhesive layer is located on the light-emitting side of the backlight module and on the front frame. The protective film is located on the light-emitting side of the backlight module and on the second adhesive layer.

[0025] In some embodiments, the first adhesive layer includes: a third sub-section and a fourth sub-section. The third sub-section and the fourth sub-section are configured to satisfy at least one of the following conditions: the third sub-section and the fourth sub-section are respectively located on opposite sides of the buffer ring and are arranged corresponding to the second side wall of the back plate. Or, the size of the third sub-section along its extension direction is less than or equal to the size of the buffer ring along the extension direction of the third sub-section. Or, the size of the fourth sub-section along its extension direction is less than or equal to the size of the buffer ring along the extension direction of the fourth sub-section. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for use in some embodiments of the utility model. Obviously, the drawings described below are only drawings of some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments of the utility model.

[0027] Figure 1 A structural diagram of a display device at a viewing angle according to some embodiments of the utility model;

[0028] Figure 2 It is a structural diagram of another display device according to some embodiments of the utility model;

[0029] Figure 3 A structural diagram of a display panel according to some embodiments of the utility model;

[0030] Figure 4 A structural diagram of a backlight module at a viewing angle according to some embodiments of the utility model;

[0031] Figure 5 Based on Figure 4 A local magnified structural diagram of the middle AA area;

[0032] Figure 6 Based on Figure 4 A local magnified structural diagram of the middle BB region;

[0033] Figure 7 Based on Figure 4 A local magnified structural diagram of the middle CC region;

[0034] Figure 8 Based on Figure 4 A local magnified structural diagram of the middle DD area;

[0035] Fig. 9 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0036] Fig.10 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0037] Fig.11 Based on Fig.10 A local enlarged structural diagram of the middle OO area;

[0038] Fig.12 Based on Fig.10 A local enlarged structural diagram of the middle EE region;

[0039] Fig.13 Based on Fig.10 A local enlarged structural diagram of the middle FF area;

[0040] Fig.14 A structural diagram of a back plate in some embodiments of the utility model at a viewing angle;

[0041] Fig.15 Based on Fig.14 A local magnified structural diagram of the middle GG region;

[0042] Fig.16 Based on Fig.14 A local magnified structural diagram of the middle HH region;

[0043] Fig.17It is a structural diagram of a back plate in some embodiments of the utility model at another viewing angle;

[0044] Fig.18 Based on Fig.17 A local enlarged structural diagram of the middle JJ region;

[0045] Fig.19 Based on Fig.17 A local magnified structural diagram of the middle KK region;

[0046] Fig. 20 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0047] Fig.21 Based on Fig. 20 A local enlarged structural diagram of the middle LL region;

[0048] Fig. 22 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0049] Fig.23 Based on Fig. 22 A local magnified structural diagram of the middle MM region;

[0050] Fig.24 Based on Fig. 22 A local magnified structural diagram of the middle NN area;

[0051] Fig.25 A partially enlarged structural diagram of a backlight module according to some embodiments of the utility model;

[0052] Fig.26 It is a structural diagram of a back plate and a reflective plate in some embodiments of the utility model at a viewing angle;

[0053] Fig. 27 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0054] Fig.28 Based on Fig. 27 A local magnified structural diagram of the middle PP region;

[0055] Fig.29 A structural diagram of a light guide plate at a viewing angle according to some embodiments of the utility model;

[0056] Fig.30 Based on Fig.29 A local enlarged structural diagram of the middle RR region;

[0057] Fig.31 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0058] Fig.32 Based on Fig.31 A local magnified structural diagram of the middle SS region;

[0059] Fig.33 It is a partial cross-sectional structural diagram of a display device according to some embodiments of the utility model;

[0060] Fig.34 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0061] Fig.35 Based on Fig.34 A local magnified structural diagram of the middle TT region;

[0062] Fig.36 A partially enlarged structural diagram of a backlight module according to some embodiments of the utility model;

[0063] Fig.37 It is a structural diagram of a backlight module in some embodiments of the utility model at another viewing angle;

[0064] Fig.38 Based on Fig.37 A local enlarged structural diagram of the middle UU region;

[0065] Fig.39 It is a structural diagram of a display device in some embodiments of the utility model at another viewing angle;

[0066] Fig.40 Based on Fig.39 A local enlarged structural diagram of the middle VV region;

[0067] Fig.41 It is a structural diagram of a display device in some embodiments of the present utility model at another viewing angle;

[0068] Fig.42 It is a structural diagram of a display device in some embodiments of the present utility model at another viewing angle;

[0069] Fig.43 It is a structural diagram of a display device after removing the protective film according to some embodiments of the utility model;

[0070] Fig.44 It is a structural explosion diagram of the backlight module in some embodiments of the utility model. DETAILED DESCRIPTION

[0071] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments provided by the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0072] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples" or "some examples" are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the utility model. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0073] When describing some embodiments, the term "electrically connected" and its derivative expressions may be used. For example, when describing some embodiments, the term "electrically connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0074] The use of "configured to" herein is intended to be open and inclusive language that does not exclude devices being configured to perform additional tasks or steps.

[0075] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0076] The terms "first" and "second" herein are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, unless otherwise specified, "multiple" means two or more.

[0077] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of the layers and the area of ​​the regions are exaggerated for clarity. Therefore, variations in the shapes relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0078] like Figure 1 As shown, some embodiments of the utility model provide a display device 1. Exemplarily, the above-mentioned display device 1 can be any display device that displays images, whether in motion (e.g., video) or fixed (e.g., still images), and whether text or images. More specifically, it is expected that the display device of the embodiment can be implemented in a variety of electronic devices or associated with a variety of electronic devices, such as (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, cameras, game consoles, watches, clocks, calculators, TV monitors, flat panel displays, computer monitors, car displays (e.g., odometer displays, etc.), displays of medical devices, navigators, cockpit controllers and / or displays, displays of camera views (e.g., displays of rear-view cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging and aesthetic structures (e.g., displays of images of a piece of jewelry), etc.

[0079] Exemplarily, the display device may be an LCD (Liquid Crystal Display) display device.

[0080] For example, the display device 1 has a touch screen, which can be used as a friendly human-machine interface (HMI), so that the interactive functions between the user and the display device are diversified. The display device can also be used normally in extreme environments such as high temperature and low temperature, for example, it can operate normally in a temperature range of -20°C to 70°C, so the display device can be called a wide temperature display device.

[0081] In some examples, such as Figure 2 As shown, the display device 1 comprises: a backlight module 10 and a display panel 20. The display panel 20 is located at the light emitting side of the backlight module 10.

[0082] For example, Figure 3 As shown, the display panel 20 includes: an array substrate 21 and a color filter substrate 22. The color filter substrate 22 is located at the light-emitting side of the backlight module 10. The array substrate 21 is located between the color filter substrate 22 and the backlight module 10.

[0083] Exemplarily, the backlight module 10 can be used as a light source to provide backlight for the display panel 20. For example, the backlight provided by the backlight module 10 can be white light or blue light. The light-emitting side of the backlight module 10 refers to the side from which the backlight module 10 emits light. The non-light-emitting side of the backlight module 10 refers to the side opposite to the light-emitting side of the backlight module 10.

[0084] Exemplarily, the array substrate 21 may include a plurality of pixel driving circuits 211 and a plurality of pixel electrodes 212, wherein the plurality of pixel driving circuits 211 are arranged in an array, for example. The plurality of pixel driving circuits 211 are electrically connected to the plurality of pixel electrodes 212 in a one-to-one correspondence, and the pixel driving circuits 211 provide pixel voltages to the corresponding pixel electrodes 212.

[0085] Exemplarily, the color film substrate 22 may include a variety of color filters, etc. For example, when the backlight provided by the backlight module 10 is white light, the color filters may include a red filter, a green filter, a blue filter, etc.

[0086] For example, a red filter can only allow red light in the incident light to pass through, a green filter can only allow green light in the incident light to pass through, and a blue filter can only allow blue light in the incident light to pass through. For another example, when the backlight provided by the backlight module 10 is blue light, the color filters can include a red filter and a green filter.

[0087] The color filter substrate 22 may further include a black matrix. For example, the black matrix has a mesh structure, with one color filter located in one mesh. The black matrix is ​​used to shield light and separate multiple color filters to avoid light crosstalk between two adjacent color filters.

[0088] Exemplarily, the display panel 20 further includes a common electrode. The common electrode can receive a common voltage.

[0089] For example, the common electrode may be disposed on the array substrate 21 .

[0090] For another example, the common electrode may be disposed on the color filter substrate 22 .

[0091] In some examples, such as Figure 3 As shown, the display panel 20 further includes: a liquid crystal layer 23 located between the color filter substrate 22 and the array substrate 21 .

[0092] Exemplarily, the liquid crystal layer 23 includes a plurality of liquid crystal molecules. For example, under the action of the above pixel voltage and the common voltage, an electric field may be formed between the pixel electrode and the common electrode, and the liquid crystal molecules in the liquid crystal layer 23 may be deflected under the action of the electric field.

[0093] It is understandable that the backlight provided by the backlight module 10 can pass through the array substrate 21 and be incident on the liquid crystal molecules of the liquid crystal layer 23. Under the action of the electric field formed between the pixel electrode and the common electrode, the liquid crystal molecules flip, thereby changing the amount of light passing through the liquid crystal molecules, so that the light emitted by the liquid crystal molecules reaches a preset brightness. The above light passes through the filters of different colors in the color filter substrate 22 and then emits. The emitted light includes light of various colors, such as red light, green light, blue light, etc. The light of various colors cooperates with each other to enable the display device 1 to achieve display.

[0094] In some examples, the display panel 20 further includes an upper polarizer located on a side of the color filter substrate 22 away from the liquid crystal layer 23 , and a lower polarizer located on a side of the array substrate 21 away from the liquid crystal layer 23 .

[0095] Exemplarily, the backlight module 10 may be an edge-type backlight module 10 .

[0096] In some examples, such as Figures 4 to 6 and Fig.44 As shown, the backlight module 10 includes a back plate 11 , a light guide plate 12 and a light bar 13 .

[0097] For example, Figure 9-10 As shown, the back plate 11 has a first groove 111. The first groove 111 includes a bottom wall 112 and a plurality of side walls 113 connected to the bottom wall 112. The plurality of side walls 113 include a first side wall 114 and a plurality of second side walls 115.

[0098] like Figure 5-6 As shown, the light guide plate 12 is located in the first groove 111 and has a light emitting surface 121 and a light incident surface 122 connected to the light emitting surface 121. The light emitting surface 121 is located on a side of the light guide plate 12 away from the bottom wall 112, and the light incident surface 122 is arranged opposite to the first side wall 114.

[0099] For example, the structure of the light guide plate 12 can be a plate-like structure or a substantially plate-like structure, and the plane where the light emitting surface 121 is located is perpendicular or substantially perpendicular to the plane where the light incident surface 122 is located. The area of ​​the light emitting surface 121 can be larger than the area of ​​the light incident surface 122.

[0100] For example, Figure 5-6As shown, the light bar 13 is located between the light guide plate 12 and the first side wall 114. Since the light incident surface 122 is disposed opposite to the first side wall 114, the light bar 13 is also disposed opposite to the light incident surface 122. The light emitted by the light bar 13 can enter the interior of the light guide plate 12 through the light incident surface 122 and be emitted through the light emitting surface 121 of the light guide plate 12.

[0101] For example, the light bar 13 may be fixed on the first side wall 114 .

[0102] In the related art, elastic parts are generally used in the backlight module to realize the positioning between the light bar and the back plate, and the compressed elastic parts are placed in contact with the light bar. However, the elastic parts have a certain elasticity, and under the action of external force, the elastic parts will deform, making the fixing and positioning of the light bar by the elastic parts unstable, and easily causing a large deviation in the fixing or assembly between the light bar and the back plate, and finally causing the light bar to be unable to be accurately positioned at the preset position, and then making the light emitted by the light bar unable to be fully utilized by the light guide plate, thereby affecting the light output efficiency of the backlight module.

[0103] Based on this, in some embodiments of the present invention, Figure 5 , Fig.11 and Fig.16 As shown, the back plate 11 includes a first positioning portion 31. The first positioning portion 31 is located on a side of the first side wall 114 close to the second side wall 115.

[0104] The first positioning portion 31 includes a first sub-portion 311 and a second sub-portion 312 connected to each other. The first sub-portion 311 is connected to the first side wall 114 , abuts against one end of the light bar 13 , and the second sub-portion 312 abuts against a portion of the light incident surface 122 of the light guide plate 12 .

[0105] For example, the light bar 13 may be in a long strip shape, and its extension direction may be defined as the first direction X. The above-mentioned “one end of the light bar 13 ” may be one end of the light bar 13 along the first direction X. Thus, the first positioning portion 31 may fix the light bar 13 by the back plate 11 .

[0106] For the convenience of explanation, in the embodiment of the present invention, the following definitions are made: the direction parallel to the plane where the bottom wall 112 is located and perpendicular to the above-mentioned first direction X is defined as the second direction Y; the direction perpendicular to the plane where the bottom wall 112 is located or the direction where the thickness of the bottom wall 112 is located is defined as the third direction Z.

[0107] For example, the back plate 11 has two side walls 113 extending along the first direction X and two side walls 113 extending along the second direction Y.

[0108] For example, the second sub-portion 312 may abut against a portion of the light incident surface 122 , thereby achieving positioning of the light guide plate 12 .

[0109] For example, the first positioning portion 31 and the first side wall 114 are an integral structure.

[0110] In an embodiment of the utility model, a backlight module 10 is provided, which includes a back plate 11, a light guide plate 12 and a light bar 13. The light guide plate 12 is located in a first groove 111 of the back plate 11. A light exit surface 121 of the light guide plate 12 is located on a side of the light guide plate 12 away from a bottom wall 112 of the back plate 11. A light entrance surface 122 of the light guide plate 12 is arranged opposite to a first side wall 114 of the back plate 11. The light bar 13 is located between the light guide plate 12 and the first side wall 114. The back plate 11 includes a first positioning portion 31, the first positioning portion 31 is connected to the first side wall 114 of the back plate 11, a first sub-portion 311 of the first positioning portion 31 abuts against the light bar 13, and a second sub-portion 312 of the first positioning portion 31 abuts against the light bar 13. A part of the light surface 122 is abutted, thereby, the light bar 13 and the light guide plate 12 are fixed by using the first positioning portion 31, so that the assembly deviation of the back panel 11 of the backlight module 10 and the light guide plate 12 and the light bar 13 can be smaller, so that the fixation between the back panel 11 and the light guide plate 12 and the light bar 13 is more firm, and the light guide plate 12 and the light bar 13 are fixed at a preset position, so that the utilization rate of the light emitted by the light bar 13 is higher, the light output efficiency of the backlight module 10 is improved, the power consumption of the display device 1 is reduced, and the movement of the backlight module 10 during the assembly process is avoided, which causes the relative movement between the back panel 11, the light guide plate 12 and the light bar 13, thereby affecting the light output efficiency of the backlight module 10.

[0111] In some examples, such as Figure 5 , Fig.11 and Fig.16 As shown, the plane where the second sub-portion 312 is located is parallel to the plane where the first side wall 114 is located. The plane where the first sub-portion 311 is located and the plane where the second sub-portion 312 is located have an included angle.

[0112] Exemplarily, there is also an angle between the plane where the first sub-portion 311 is located and the first side wall 114, which can be 90° or approximately 90°. The angle between the plane where the first sub-portion 311 is located and the plane where the second sub-portion 312 is located can also be approximately 90°. The orthographic projection shape of the first positioning portion 31 on the plane where the bottom wall is located can be an "L" shape.

[0113] It can be understood that the first sub-portion 311 and the second sub-portion 312 can both be plate-like structures, and the end face of the light bar 13 along the first direction X and close to one end of the first sub-portion 311 is a roughly flat surface, for example, the surface can be vertical or roughly vertical to the first direction X. Thus, by adopting the above-mentioned arrangement, the contact area between the first sub-portion 311 and the end of the light bar 13 along the first direction X and close to the first sub-portion 311 can be larger, thereby enhancing the fixing effect of the first sub-portion 311 and the first positioning portion 31 on the light bar 13 and reducing the probability of the light bar 13 shaking along the first direction X.

[0114] Similarly, the light incident surface 122 of the light guide plate 12 is a flat surface and is parallel to the plane where the first side wall 114 is located, so that the plane where the second sub-portion 312 is located is also parallel or substantially parallel to the light incident surface 122. Therefore, the contact area between the second sub-portion 312 and the light incident surface 122 is relatively large, so that the fixing effect of the second sub-portion 312 and the first fixing portion 30 on the light guide plate 12 can be enhanced, and the relative movement of the light guide plate 12 along the second direction Y in the backlight module 10 can be alleviated or avoided, ensuring that the light guide plate 12 is accurately positioned in the back plate 11.

[0115] In some examples, such as Figure 6 and Fig.18 As shown, the back plate 11 further includes: a second positioning portion 32 connected to the bottom wall 112. For example, the second positioning portion 32 and the bottom wall 112 may be an integral structure.

[0116] Exemplarily, the second positioning portion 32 protrudes along the bottom wall 112 in a direction pointing toward the light guide plate 12 . The second positioning portion 32 is parallel to the first side wall 114 , and the second positioning portion 32 abuts against the light guide plate 12 .

[0117] For example, the second positioning portion 32 may be a plate-shaped structure, the plane where the second positioning portion 32 is located is parallel to the plane where the first side wall 114 is located, and the second positioning portion 32 may limit the relative movement of the light guide plate 12 along the second direction Y.

[0118] The embodiment of the utility model utilizes the above-mentioned first fixing portion 31 and the second positioning portion 32 to fix the opposite ends of the light guide plate 12 along the second direction X, and limit the relative movement of the light guide plate 12 along the second direction Y, thereby ensuring that the light emitted by the light bar 13 can be emitted through the light emitting surface 121 of the light guide plate 12, ensuring that the backlight module 10 has good light emitting efficiency, and further reducing the probability of the light guide plate 12 shaking or moving in the backlight module 10, avoiding the relative position of the light bar 13 and the light incident surface 122 from moving, and avoiding the light emitted by the light bar 13 from being unable to be incident on the light incident surface 122 and being lost.

[0119] In some examples, such as Figure 6 and Fig.18As shown, the back plate 11 further includes: a first opening 41 located on the bottom wall 112. The second positioning portion 32 and the first side wall 114 are located on two opposite sides of the first opening 41, for example, on two opposite sides of the first opening 41 along the second direction Y.

[0120] For example, Figure 6 As shown, the light bar 13 includes a substrate 131 and a connector 132 .

[0121] For example, the base 131 may be an aluminum substrate.

[0122] Exemplarily, the connector 132 is located at one end of the base 131 and is connected to the base 131. For example, the connector 132 is located at one end of the base 131 along the first direction X. The orthographic projection of the connector 132 on the plane where the bottom wall 112 is located is located in the first opening 41. For example, the boundary line of the orthographic projection of the connector 132 on the plane where the bottom wall 112 is located is located in the first opening 41.

[0123] For example, Figure 6 As shown, the light bar 13 further includes: a plurality of lamps 133. The plurality of lamps 133 are located on the substrate 131 and are electrically connected to the substrate 131. The lamps 133 may be LED (Light-Emitting Diode) lamps.

[0124] For example, Fig. 20 and Fig.21 As shown, the backlight module 10 further includes a light circuit board 134 . The light circuit board 134 is connected to the connector 132 via the first opening 41 and extends to a surface of the bottom wall 112 away from the light guide plate 12 .

[0125] For example, the light circuit board 134 may be a flexible circuit board.

[0126] For example, the lamp circuit board 134 can transmit a driving signal to the light bar 13 through the connector 132 and the substrate 131 , and the driving signal drives the lamp 133 to emit light.

[0127] It is understandable that if Figure 6 As shown, since the connector 132 protrudes toward the light guide plate 12 relative to the base 131, a corresponding avoidance groove is provided on the light guide plate 12 on the side of the light guide plate 12 close to the connector 132, and the avoidance groove has a first groove wall extending along the first direction X and a groove wall extending along the second direction Y, and the first groove wall and the second groove wall are connected. The second fixing portion can abut against the first groove wall, and the connector 132 is located in the space surrounded by the second fixing portion and the second groove wall. The second fixing portion and the connector 132 can contact each other or have a gap.

[0128] The provision of the first opening 41 facilitates the plug-in connection between the lamp circuit board 134 and the connector 132. The first opening 41 is adjacent to the second positioning portion 32, which is beneficial to simplifying the preparation process of the back plate 11.

[0129] In some examples, such as Figure 5 , Figure 6 , Figure 23 to Figure 25 As shown, the backlight module 10 further includes: a plurality of buffers 50 . The buffers 50 are located on one side of two adjacent side walls 113 close to the light guide plate 12 , and are located on one side of the bottom wall 112 close to the light guide plate 12 .

[0130] For example, the back plate 11 includes four side walls 113 , and the backlight module 10 includes four buffer components 50 . The four buffer components 50 are respectively located at the connection between two adjacent side walls 113 .

[0131] The buffer 50 has a limiting portion 51, and the limiting portion 51 is located between the light guide plate 12 and the side wall 113. The limiting portion 51 is used to limit the relative movement between the light guide plate 12 and the side wall 113, to prevent the relative movement between the light guide plate 12 and the side wall 113 from affecting the emission of light emitted by the light bar 13, to avoid affecting the light emission efficiency of the backlight module 10, and to prevent the shaking of the light guide plate 12 from squeezing and colliding with the light bar 13 and affecting the light emission of the light bar 13.

[0132] In some examples, the buffer 50 is elastic and can be deformed under the action of an external force, and can return to its original shape after the external force is removed.

[0133] For example, when the buffer 50 is squeezed by an external force, the buffer 50 can be compressed to reduce its own volume or size, and after the external force is reduced, the size of the compressed buffer 50 can gradually recover, and after the external force is removed, the buffer 50 can recover to or approximately recover to its original volume or size. Therefore, in the case that the backlight module 10 or the display device 1 shakes or moves during transportation or preparation, the buffer 50 can provide a buffering effect for the light guide plate 12, and when the shaking or movement stops, the buffer 50 can return to its original state, so that the light guide plate 12 is in a suitable position, ensuring that the light emitted by the light bar 13 can be emitted through the light guide plate 12, and ensuring the light extraction efficiency of the backlight module 10.

[0134] Exemplarily, the compression ratio of the buffer 50 may range from 50% to 70%. For example, the compression ratio of the buffer 50 may be 50%, 58%, 60%, 62% or 70%.

[0135] The compression ratio here refers to the ratio of the compressed size of the buffer 50 to the original size.

[0136] For example, the material of the buffer member 50 may be a rubber material.

[0137] In some examples, such as Fig.25 As shown, the buffer 50 further includes a support portion 52 connected to the limiting portion 51. The thickness of the support portion 52 (or the dimension along the third direction Z) is smaller than the thickness of the limiting portion 51 (or the dimension along the third direction Z). For example, the thickness of the support portion 52 is 0.5 mm.

[0138] like Fig.26 As shown, the backlight module 10 further includes a reflector 60 located between the bottom wall 112 and the light guide plate 12. The reflector 60 is used to reflect the light emitted from the light guide plate 12 to the reflector 60, which is beneficial for the light to be emitted from the light emitting surface 121 of the light guide plate 12, and is beneficial for improving the light emitting efficiency of the backlight module 10.

[0139] like Fig.17 and Fig.18 As shown, the bottom wall 112 includes a reinforcing portion 116 protruding toward the light guide plate 12. The reinforcing portion 116 is located in the middle portion of the bottom wall 112. The reinforcing portion 116 is not connected to the side wall 113 of the back plate 11. Therefore, the reinforcing portion 116 can be used to strengthen the strength of the back plate 11, so as to avoid the back plate 11 being easily deformed, insufficient in strength, and other problems that affect the function of the backlight module 10.

[0140] The support portion 52 is located between the reflector 60 and the bottom wall 112, and between the reinforcement portion 116 and the side wall 113, and most of the reflector 60 is located on the reinforcement portion 116 of the bottom wall 112. Therefore, the support portion 52 can be used to support the reflector 60, so that the reflector 60 is relatively stable on the back plate 11, ensuring the reflection effect of the reflector 60 on the light, ensuring the light extraction efficiency of the backlight module 10, and preventing the light guide plate 12 from being dislocated or slipping on the reinforcement portion 116, thereby preventing the reflection of the light by the reflector 60 from being affected.

[0141] In some examples, such as Figure 6 As shown, the plurality of buffers 50 are configured to satisfy at least one of the following conditions. The at least one condition may be three conditions. Specifically, condition 1: the plurality of buffers include a first buffer 53, and the first buffer 53 is located on one side of the adjacent first side wall 114 and the second side wall 115. The first buffer 53 abuts against the end surface of the second positioning portion 32 away from the first side wall 114.

[0142] This facilitates the positioning of the first buffer member 53 .

[0143] For example, Fig.25 As shown, the supporting portion 52 of the first buffer member 53 abuts against the second positioning portion 32 .

[0144] The orthographic projection of the first buffer member 53 on the plane where the bottom wall 112 is located does not overlap with the first opening 41 , thereby preventing the first buffer member 53 from blocking the first opening 41 .

[0145] The limiting portion 51 of the first buffer member 53 is located between the second side wall 115 and the light guide plate 12 , so as to limit the light guide plate 12 along the first direction X.

[0146] like Figure 5 As shown, condition 2: the plurality of buffers 50 include a second buffer 54, and the second buffer 54 is located on one side of the adjacent first side wall 114 and second side wall 115. The limiting portion 51 of the second buffer 54 is also located between the second side wall 115 and the first positioning portion 31.

[0147] For example, there is a gap between the limiting portion 51 of the second buffer 54 and the first positioning portion 31. The limiting portion 51 of the second buffer 54 is also located between the light guide plate 12 and the second side wall 115, so that the second buffer 54 can be used to limit the light guide plate 12 along the first direction X.

[0148] Since the light bar 13 extends along the first direction X and is disposed on the first side wall 114, the embodiment of the utility model is provided with a first positioning portion 31 and a second alignment portion to limit the light guide plate 12 in the second direction Y, so as to prevent the light guide plate 12 from moving in the second direction Y and colliding with the light bar 13. The first buffer 53 and the second buffer 54 are provided to limit the light guide plate 12 in the first direction X, and the buffer 50 can also provide a buffering effect on the side wall 113 or the light guide plate 12.

[0149] In some examples, such as Fig. 22 , Fig.23 and Fig.24 As shown, condition three: the plurality of buffer members include at least one third buffer member 55 , and the third buffer member 55 is located on one side of two adjacent second side walls 115 . For example, the plurality of buffer members include two third buffer members 55 .

[0150] The limiting portion 51 of the third buffer member 55 includes a first sub-limiting portion 511 and a second sub-limiting portion 512 connected to each other. For example, the first sub-limiting portion 511 extends along the first direction X, and the second sub-limiting portion 512 extends along the second direction Y. The first sub-limiting portion 511 is located on a side of the light guide plate 12 away from the light bar 13, and the first sub-limiting portion 511 is interference-fitted with the light guide plate 12.

[0151] Since the buffer is elastic, the first sub-limiting portion 511 is interference fit with the light guide plate 12, and the light guide plate 12 squeezes the first sub-limiting portion 511 along the second direction Y, so that the first sub-limiting portion 511 exerts a force on the light guide plate 12 along the second direction Y and close to the first side wall 114, so that the end faces of the light guide plate 12 close to the first side wall 114 are respectively in contact with the first positioning portion 31 and the second positioning portion 32, thereby fixing the light guide plate 12 in the second direction Y.

[0152] For example, the interference between the first sub-limiting portion 511 and the light guide plate 12 is 0.2 mm. Therefore, under the premise of ensuring the assembly tolerance of the back panel 11 and the light guide plate 12, the spacing between the light guide plate 12 and the lights in the light bar 13 can be made 0.5 mm. This can not only make the light output efficiency of the backlight module 10 higher, but also avoid collision between the light guide plate 12 and the lights to affect the light emission of the lights.

[0153] For example, there may be a gap between the second sub-limiting portion 512 and the light guide plate 12 .

[0154] In some examples, such as Figure 7 , Figure 8 , Fig.12 , Fig.13 and Fig.15 As shown, the back plate 11 further includes: a plurality of limiting members 61 . The second side wall 115 is connected to at least one limiting member 61 .

[0155] For example, one limiting member 61 is disposed on the two second side walls 115 extending along the second direction Y, and two limiting members 61 are disposed on the second side walls 115 extending along the first direction X. The limiting member 61 and the second side walls 115 may be an integral structure.

[0156] The backlight module 10 further includes: an optical film group 70 located at the light guide plate 12 away from the bottom wall 112. The optical film group 70 includes a plurality of protrusions 71. One protrusion 71 is located in a limiting member 61. The limiting member 61 is used to limit the movement of the optical film group 70 in the first direction X and the second direction Y through the protrusion 71, thereby fixing the optical film group 70, ensuring that the backlight module 10 provides backlight normally in high and low temperature environments, and preventing the optical film group 70 from shaking during transportation to produce anisotropy and the like.

[0157] Exemplarily, the optical film group 70 includes at least: a first brightness enhancement film, a first light homogenizing film, a second light homogenizing film, and a second brightness enhancement film 72 which are sequentially stacked on the side of the light guide plate 12 away from the bottom wall 112. The first brightness enhancement film and the second brightness enhancement film are used to increase the brightness of the light provided by the backlight module 10 and reduce the power consumption of the backlight module 10. The first light homogenizing film and the second light homogenizing film are used to improve the uniformity of the light output of the backlight module 10. For example, the first light homogenizing film and the second light homogenizing film can be prism structures, and the prism angles of the two prism structures can be different. The prism angle of the first light homogenizing film can be 0°, and the prism angle of the second light homogenizing film can be 90°.

[0158] For example, the thickness of the first brightness enhancement film may be 0.215 mm, and the thickness of the second brightness enhancement film may be 0.225 mm.

[0159] In some examples, such as Figure 7 , Figure 8 , Fig.12 , Fig.13 and Fig.15 As shown, the limiting member 61 includes: a limiting sub-member 611, which is located on a side of the second side wall 115 close to the light guide plate 12. For example, the limiting sub-member 611 is a plate-shaped structure, and the limiting sub-member 611 is sunken relative to the second side wall 115 connected thereto.

[0160] The limiting sub-component 611 is provided with a second groove 612, and the protrusion 71 extends into the second groove 612. Taking the second side wall 115 extending along the first direction X as an example, the protrusion 71 is retracted relative to the second side wall 115, and there is a gap between the end of the protrusion 71 and the plane where the second side wall 115 is located. In this way, the protrusion 71 can be prevented from extending outside the outer contour of the second side wall 115, and the optical film assembly 70 can be prevented from being scratched, collided, etc., which may affect its function.

[0161] Exemplarily, there is a gap between the protrusion 71 and the inner wall of the second groove 612. Thus, the gap can be used as a space for the thermal expansion and contraction of the protrusion 71 under different temperature environments, thereby preventing wrinkles from occurring during the expansion of the optical film assembly 70 and affecting its function.

[0162] The portion of the protrusion 71 located at the second brightness enhancement film 72 has a larger gap with the inner wall of the second groove 612, thereby leaving sufficient space for the thermal expansion and contraction of the second brightness enhancement film 72, thereby preventing the second brightness enhancement film 72 from wrinkling as a whole during expansion, thereby affecting its brightness enhancement function and preventing the display device from having bright lines, dark lines, etc.

[0163] In some examples, such as Fig.14 and Fig.15As shown, the plurality of second side walls 115 include: a third side wall 117 and a fourth side wall 118 connected to the first side wall 114 and arranged opposite to each other.

[0164] like Fig.15 and Fig.19 As shown, the back plate 11 further includes: a plurality of mounting portions 80. The mounting portion 80 passes through the third side wall 117 or the fourth side wall 118. The mounting portion 80 has a blind hole 81, and the entrance of the blind hole 81 is located on the side of the second side wall 115 away from the light guide plate 12.

[0165] The mounting portion 80 is used to mount and fix the backlight module 10 or the display device 1 to the terminal. For example, the terminal is provided with a corresponding mounting post, which extends into the blind hole 81, so as to achieve the fixation between the display device 1 and the terminal. In addition, the design of the blind hole 81 on the mounting portion 80 can prevent foreign matter from entering the interior of the display device 1 or the backlight module 10 during the installation process of the display device 1 and the terminal.

[0166] For example, the mounting portion 80 may be a rivet column structure, the diameter of the rivet column structure may be 3 mm, and the depth of the blind hole 81 inside may be 3.5 mm.

[0167] In some examples, such as Fig. 27 and Fig.28 As shown, the back plate 11 further includes: at least one third positioning portion 33 connected to the bottom wall 112 . The third positioning portion 33 is located on a side of the bottom wall 112 away from the light guide plate 12 .

[0168] The third positioning portion 33 is configured to be engaged with the display circuit board 203 of the display panel 20 .

[0169] For example, the third positioning portion 33 may be columnar or substantially columnar, and a corresponding through hole may be provided on the display circuit board 203 . The third positioning portion 33 is inserted into the corresponding through hole to achieve the clamping of the display circuit board 203 .

[0170] In some examples, such as Fig. 9 As shown, the back plate 11 further includes: a second opening 42 and at least one third opening 43 located on the bottom wall 112 .

[0171] For example, the second opening 42 may be rectangular or substantially rectangular in shape.

[0172] Exemplarily, the second opening 42 is used to transmit a Near Field Communication (NFC) signal. By using the second opening 42 as a transmission channel for the NFC signal, the NFC recognition accuracy can be improved, and the back plate 11 can be prevented from blocking or interfering with the NFC signal, thereby damaging the accuracy of the NFC signal. At the same time, the back plate can have good anti-static and anti-electromagnetic interference capabilities.

[0173] Exemplarily, the third opening 43 is used for positioning during the processing of the back plate 11, such as positioning between the back plate 11 and the mold for making the back plate 11, thereby making the size accuracy of the prepared back plate 11 higher. For example, the third opening 43 can be circular or substantially circular. In the case where the back plate 11 includes a plurality of third openings, the plurality of third openings 43 are evenly distributed on the back plate 11.

[0174] In some examples, such as Fig.29 and Fig.30 As shown, the light guide plate 12 includes: a main body 123 and at least one side reflector 124. The light emitting surface 121 and the light incident surface 122 are arranged on the main body 123. The side reflector 124 is located on the side of the main body and does not overlap with the light incident surface 122 of the main body.

[0175] For example, the side reflection portion 124 may be a reflection sheet attached to the side surface of the main body.

[0176] Exemplarily, the main body 123 has four side surfaces, one of which is a light incident surface 122, and the other three side surfaces are provided with side reflection portions 124. The side reflection portions 124 are used to reflect light.

[0177] For example, the light emitted by the light strip 13 enters the light guide plate 12 from the light incident surface 122 of the light guide plate 12, most of the light is emitted from the light emitting surface 121 of the light guide plate 12, and part of the light is incident on the side reflecting portion 124 of the main body 123, and after being reflected by the side reflecting portion 124, it is emitted from the light emitting surface 121.

[0178] Therefore, the provision of the side reflector 124 can improve the light extraction efficiency of the backlight module 10 , reduce the loss of light emitted by the light bar 13 on the light guide plate 12 , and reduce the power consumption of the backlight module 10 and the display device 1 .

[0179] In some examples, such as Figure 31 to Figure 33 As shown, the backlight module 10 further includes a plastic frame 90 .

[0180] The plastic frame 90 includes a supporting sub-component 91 and a peripheral plate 92 connected to each other. The supporting sub-component 91 is located on a side of the light guide plate 12 away from the bottom wall 112 , and the peripheral plate 92 surrounds the side wall 113 of the back plate 11 .

[0181] The outer peripheral plate 92 includes: at least one avoidance portion 93 and a first sub-plate 94 located outside the first side wall 114. For example, the first sub-plate 94 is adjacent to the light bar 13.

[0182] The avoidance portion 93 is connected to the first sub-plate 94, and the avoidance portion 93 is recessed along the direction of the first sub-plate 94 pointing to the first side wall 114. For example, the first sub-plate 94 is connected to a plurality of avoidance portions 93, and the plurality of avoidance portions 93 are distributed at intervals. The thickness of the avoidance portion 93 is less than the thickness of the first sub-plate 94 connected thereto, and the avoidance portion 93 is retracted relative to the first sub-plate 94.

[0183] The flexible circuit board 202 of the display device 1 extends to the non-light-emitting side of the backlight module 10 through the avoidance portion 93 . The width of the portion of the flexible circuit board 202 overlapping the avoidance portion 93 is less than or equal to the width of the avoidance portion 93 .

[0184] Here, the width of the portion of the flexible circuit board 202 overlapping the avoidance portion 93 refers to the size of the portion of the flexible circuit board 202 overlapping the avoidance portion 93 in the first direction X or in the extending direction of the light bar 13 .

[0185] The width of the escape portion 93 refers to a dimension of the escape portion 93 in the first direction X or in the extending direction of the light bar 13 .

[0186] Therefore, when the flexible circuit board 202 is bent from the light-emitting side of the backlight module 10 and goes around to the non-light-emitting side of the backlight module 10, the portion of the flexible circuit board 202 in contact with the plastic frame 90 can be located in the avoidance portion 93, so as to prevent the flexible circuit board 202 from directly contacting the back plate 11 during the bending process, and to prevent the burrs on the back plate 11 from scratching the wiring of the flexible circuit board 202 and causing poor display of the display screen. Moreover, the contact portion of the flexible circuit board 202 with the plastic frame 90 is located in the avoidance portion 93, which can reduce the size of the flexible circuit board 202 protruding from the outer contour of the plastic frame 90, or prevent the flexible circuit board 202 from protruding from the outer contour of the plastic frame 90, thereby protecting the flexible circuit board 202.

[0187] Exemplarily, the recessed depth of the avoidance portion 93 is greater than or equal to the thickness of the flexible circuit board 202. The recessed depth herein refers to the shrinkage dimension of the avoidance portion 93 relative to the first sub-board 94.

[0188] For example, the recessed depth of the escape portion 93 is greater than the thickness of the flexible circuit board 202 .

[0189] For another example, the recessed depth of the avoiding portion 93 is equal to the thickness of the flexible circuit board 202 .

[0190] For example, the recessed depth of the avoidance portion 93 may be 0.8 mm, and the thickness of the flexible circuit board 202 may be 0.1 mm.

[0191] Therefore, the avoidance portion 93 can ensure the protection of the flexible circuit board 202, and prevent the flexible circuit board 202 from protruding from the outer contour of the plastic frame 90 and being easily scratched or bumped by the outside, thereby avoiding affecting the signal transmitted by the flexible circuit board 202.

[0192] In some examples, such as Fig.15 , Fig.16 and Fig.32 As shown, the back plate 11 further includes: a plurality of first buckle portions 82 . The first buckle portions 82 are connected to a surface of a side of the side wall 113 of the back plate 11 away from the light guide plate 12 , and protrude in a direction away from the side wall 113 .

[0193] For example, at least one first buckle portion 82 is disposed on each side wall 113 of the back plate 11. In the case where a plurality of first buckle portions 82 are disposed on the side wall 113, the plurality of first buckle portions 82 are distributed at intervals.

[0194] In some examples, such as Fig.32 As shown, the plastic frame 90 further includes: a plurality of fourth openings 921 disposed on the peripheral plate 92. The first buckle portion 82 extends into the fourth opening 921, and the fourth opening 921 is engaged with the first buckle portion 82. Thus, the plastic frame 90 is fixedly connected to the back plate 11.

[0195] In some examples, such as Figure 33 to Figure 36 As shown, the backlight module 10 further includes a front frame 83 .

[0196] The front frame 83 at least surrounds the plastic frame 90 . The front frame 83 includes: a plurality of side panels 84 parallel to the side walls 113 of the back panel 11 , and at least one second buckle portion 85 disposed on the side panels 84 .

[0197] The second snap-fitting portion 85 includes a fifth opening 86 and a snap-fitting portion 87, wherein the snap-fitting portion 87 is recessed along the direction from the side plate to the side wall 113, and the snap-fitting portion 87 is recessed relative to the side plate. The snap-fitting portion 87 constitutes a part of the inner wall of the fifth opening 86. The orthographic projection of the first snap-fitting portion 82 of the back plate 11 on the side plate is located in the fifth opening 86. The snap-fitting portion 87 abuts against the first snap-fitting portion 82. Thus, the fixed connection between the back plate 11 and the front frame 83 can be achieved, and since the snap-fitting portion 87 is recessed relative to the side plate, the first snap-fitting portion 82 can be recessed relative to the side plate 84 or be roughly flush with the plane where the side plate 84 is located, so that the front frame 83 plays a certain role in protecting the back plate 11. The fixation of the back plate 11 and the front frame 83 is relatively firm, and the first snap-fitting portion 82 is prevented from extending out of the fifth opening 86 and protruding relative to the side plate 84, and being easily scratched or bumped during the preparation or transportation process, thereby avoiding affecting the normal function of the back plate 11.

[0198] In some examples, such as Fig.28 , Fig.37 and Fig.38 As shown, the front frame 83 further includes a bending portion 88. The side plate 84 parallel to the first side wall 114 of the back plate 11 is connected to the bending portion 88, and the bending portion 88 is also connected to an end of the side plate 84 close to the non-light emitting side of the backlight module 10. The bending portion 88 is bent in a direction close to the non-light emitting side of the backlight module 10.

[0199] For example, the dimension of the bent portion 88 along the first direction X is smaller than the dimension of the side plate connected thereto along the first direction X. The orthographic projection of the bent portion 88 on the plane where the bottom wall 112 is located does not overlap with the first opening 41 .

[0200] The bending portion 88 can protect the flexible circuit board 202, preventing the surface of the flexible circuit board 202 away from the avoidance portion 93 from being scratched by the outside world, thereby causing abnormality in the image displayed by the display panel 20. The bending portion 88 also protects the structure located thereon (such as the light shielding portion 201 mentioned below), preventing the structure from being bent to a large extent and easily broken during the bending process.

[0201] like Fig.28 , Fig.32 , Fig.41 and Fig.42 As shown, the display device 1 provided in some embodiments of the present invention further includes: a light shielding portion 201 , a flexible circuit board 202 and a display circuit board 203 .

[0202] The flexible circuit board 202 is connected to the display panel 20 and the display circuit board 203 ; the display circuit board 203 is located at the non-light emitting side of the backlight module 10 .

[0203] The light shielding portion 201 extends from the side plate of the front frame 83 through the bent portion to the non-light-emitting side of the backlight module, and the light shielding portion 201 covers the flexible circuit board 202 and the display circuit board 203. Therefore, the light shielding portion 201 can protect the flexible circuit board 202 and the display circuit board 203, and can alleviate or even avoid light leakage of the display device 1.

[0204] In some examples, such as Fig.39 and Fig.40 As shown, the display device 1 further includes: a buffer ring 204 and a first adhesive layer 205 .

[0205] The buffer ring 204 is located between the rubber frame 90 of the backlight module 10 and the display panel 20. The buffer ring 204 can be a foam tape, such as black polyurethane foam. Therefore, the buffer ring 204 can relieve the stress of the display panel 20 from the outside, and avoid the light leakage phenomenon caused by the deformation of the display panel 20, especially the L0 light leakage phenomenon (the L0 light leakage here refers to the phenomenon that the display brightness of some areas of the display panel 20 is higher than the display brightness of other surrounding areas under pure black brightness).

[0206] The first adhesive layer 205 is located between the buffer ring 204 and the display panel 20. For example, the material of the first adhesive layer 205 can be double-sided adhesive.

[0207] Thus, the fixation of the display panel 20 can be enhanced, and adverse phenomena such as shaking and abnormal noise of the display panel 20 during transportation of the display device 1 can be alleviated or even avoided.

[0208] In some examples, the first adhesive layer 205 includes: a third sub-portion 2051 and a fourth sub-portion 2052; the third sub-portion 2051 and the fourth sub-portion 2052 are configured to satisfy at least one of the following three conditions. Specifically, condition 1: the third sub-portion 2051 and the fourth sub-portion 2052 are respectively located on opposite sides of the buffer ring 204 and are arranged corresponding to the second side wall 115 of the back plate 11.

[0209] For example, the third sub-portion 2051 and the fourth sub-portion 2052 are parallel to each other, and the third sub-portion 2051 extends along the second direction Y.

[0210] The above arrangement can not only realize partial fixation of the display panel 20 by the first adhesive layer 205 , but also reduce the degree of deformation of the display panel 20 as the plastic frame 90 deforms, thereby preventing the display panel 20 from being greatly deformed along with the plastic frame 90 and affecting the picture display when the plastic frame 90 deforms.

[0211] Condition two of the above three conditions: the size of the third sub-section 2051 along its extension direction is less than or equal to the size of the buffer ring 204 along the extension direction of the third sub-section 2051; Condition three of the above three conditions: the size of the fourth sub-section 2052 along its extension direction is less than or equal to the size of the buffer ring 204 along the extension direction of the fourth sub-section 2052.

[0212] Therefore, the two opposite ends of the display panel 20 along the second direction Y are not constrained by the plastic frame 90 and the buffer ring 204 , and are less affected by the deformation of the plastic frame 90 and the buffer ring 204 , thereby reducing the risk of deformation of the display panel 20 .

[0213] In some examples, such as Fig.41 and Fig.43As shown, the display device 1 further includes: a second adhesive layer 206 located on the light-emitting side of the backlight module 10 and on the front frame 83 , and a protective film 207 located on the light-emitting side of the backlight module 10 and on the second adhesive layer 206 .

[0214] For example, the material of the protective film 207 may be polyethylene terephthalate. The protective film 207 is used to protect the display panel 20 to prevent water vapor, foreign matter, etc. from entering the display device 1 during transportation.

[0215] The protective film 207 may have a handle, so that when a user uses it, the protective film 207 and the second adhesive layer 206 can be removed more conveniently using the handle.

[0216] For example, the material of the second adhesive layer 206 may be a double-sided adhesive tape, and the adhesiveness of the two surfaces of the double-sided adhesive tape is different, and the adhesiveness of the surface bonded to the protective film 207 is greater, and greater than the adhesiveness between the double-sided adhesive tape and the front frame 83. Therefore, when the user uses the display device 1, the protective film 207 and the second adhesive layer 206 can be removed relatively easily, and the residue of the second adhesive layer 206 on the front frame 83 is less, thereby ensuring the neatness of the appearance of the display device 1.

[0217] It can be understood that the display device 1 has a display area DA and a non-display area FA. Fig.33 In some embodiments of the utility model, a boundary line BL between the display area DA and the auxiliary display area FA is set, and a dimension L1 between the boundary line BL and the outer contour line of the upper polarizer P1 is 2.5 mm; a spacing L2 between the boundary line BL and the outer contour line of the color film substrate 22 is 2.8 mm; a maximum distance between the black matrix in the color film substrate 22 and the outer contour line of the color film substrate 22 is 0.2 mm; in the third direction Z, a spacing L3 between the upper polarizer P1 and the front frame 83 is 0.4 mm, a thickness of the upper polarizer is 0.112 mm, a thickness of the color film substrate is 0.5 mm, and a minimum distance L4 between the boundary line BL and the front frame is 1.1 mm. Therefore, when a user views the display device 1 at a viewing angle of 45° to the boundary line BL, there will be no slit light leakage in the non-display area FA of the display device 1.

[0218] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: The backlight module comprises: A back plate having a first groove; the first groove comprises a bottom wall and a plurality of side walls connected to the bottom wall; the plurality of side walls comprises a first side wall and a plurality of second side walls; a light guide plate, located in the first groove, the light guide plate having a light emitting surface and a light incident surface connected to the light emitting surface; the light emitting surface is located on a side of the light guide plate away from the bottom wall, and the light incident surface is arranged opposite to the first side wall; a light bar, located between the light guide plate and the first side wall; Among them, the back panel includes: a first positioning portion; the first positioning portion is located on a side of the first side wall close to the second side wall; the first positioning portion includes: a first sub-portion and a second sub-portion connected to each other; the first sub-portion is connected to the first side wall; the first sub-portion abuts against one end of the light strip, and the second sub-portion abuts against a part of the light incident surface of the light guide plate.

2. The backlight module according to claim 1, characterized in that: The plane where the second sub-portion is located is parallel to the plane where the first side wall is located; the plane where the first sub-portion is located and the plane where the second sub-portion is located have an included angle.

3. The backlight module according to claim 1, characterized in that: The back plate further comprises: a second positioning portion connected to the bottom wall; The second positioning portion protrudes along the bottom wall in a direction pointing to the light guide plate; the second positioning portion is parallel to the first side wall, and the second positioning portion abuts against the light guide plate.

4. The backlight module according to claim 3, characterized in that: The back plate further comprises: a first opening located on the bottom wall; the second positioning portion and the first side wall are located on opposite sides of the first opening; The light bar comprises: a base, and a connector located at one end of the base and connected to the base; the orthographic projection of the connector on the plane where the bottom wall is located is located in the first opening; The backlight module further includes: a light circuit board; the light circuit board is connected to the connector through the first opening and extends to a surface of one side of the bottom wall away from the light guide plate.

5. The backlight module according to claim 3, characterized in that: The backlight module further includes: a plurality of buffers; the buffers are located on one side of two adjacent side walls close to the light guide plate, and on one side of the bottom wall close to the light guide plate; The buffer member has a limiting portion, and the limiting portion is located between the light guide plate and the side wall.

6. The backlight module according to claim 5, characterized in that: The buffer member also has a supporting portion connected to the limiting portion; The backlight module further includes: a reflective plate located between the bottom wall and the light guide plate; The bottom wall comprises: a reinforcement portion protruding toward the light guide plate; The supporting portion is located between the reflecting plate and the bottom wall, and between the reinforcing portion and the side wall.

7. The backlight module according to claim 5, characterized in that: The plurality of buffers are configured to satisfy at least one of the following conditions: The plurality of buffers include a first buffer, the first buffer is located on one side of the adjacent first side wall and the second side wall; the first buffer abuts against an end surface of the second positioning portion away from the first side wall; Or, the plurality of buffers include a second buffer, the second buffer is located on one side of the adjacent first side wall and the second side wall; a portion of the limiting portion of the second buffer is also located between the second side wall and the first positioning portion; Or, the multiple buffer members include at least one third buffer member, and the third buffer member is located on one side of two adjacent second side walls; the limiting portion of the third buffer member includes a first sub-limiting portion and a second sub-limiting portion connected to each other; the first sub-limiting portion is located on the side of the light guide plate away from the light bar, and the first sub-limiting portion and the light guide plate have an interference fit.

8. The backlight module according to claim 1, characterized in that: The back plate further comprises: a plurality of limiting members; the second side wall is connected to at least one of the limiting members; The backlight module further comprises: an optical film set located on the light guide plate away from the bottom wall; the optical film set comprises a plurality of protrusions; The one protrusion is located within one of the limiting members.

9. The backlight module according to claim 8, characterized in that: The limiting component includes: a limiting sub-component, which is located on the side of the second side wall close to the light guide plate; a second groove is opened on the limiting sub-component, and the protrusion extends into the second groove; there is a gap between the protrusion and the inner wall of the second groove.

10. The backlight module according to claim 1, characterized in that: The plurality of second side walls include: a third side wall and a fourth side wall connected to the first side wall and arranged opposite to each other; The back plate further includes: a plurality of mounting portions; the mounting portions penetrate the third side wall or the fourth side wall; the mounting portions have blind holes, and the entrances of the blind holes are located on a side of the second side wall away from the light guide plate.

11. The backlight module according to claim 1, characterized in that: The back plate further comprises: a third positioning portion connected to the bottom wall; the third positioning portion is located at a side of the bottom wall away from the light guide plate; The third positioning portion is configured to be engaged with a display circuit board of the display panel.

12. The backlight module according to claim 1, characterized in that: The back plate further comprises: a second opening and at least one third opening located on the bottom wall; The second opening is used for transmitting near field communication signals; the third opening is used for positioning during the processing of the back plate; And / or, the light guide plate includes: a main body and at least one side reflecting portion; the main body has the light emitting surface and the light incident surface; the side reflecting portion is located on the side of the main body and has no overlap with the light incident surface of the main body.

13. The backlight module according to claim 1, characterized in that: The backlight module further comprises: a plastic frame; the plastic frame comprises a supporting portion and a peripheral plate connected to each other; the supporting portion is located on a side of the light guide plate away from the bottom wall, and the peripheral plate surrounds the side wall of the back plate; The peripheral plate comprises: at least one avoidance portion and a first sub-plate located outside the first side wall; the avoidance portion is connected to the first sub-plate, and the avoidance portion is recessed in a direction from the first sub-plate to the first side wall; the flexible circuit board of the display device extends to the non-light emitting side of the backlight module through the avoidance portion; Wherein, the width of the portion of the flexible circuit board located in the avoidance portion is less than or equal to the width of the avoidance portion; and / or the recessed depth of the avoidance portion is greater than or equal to the thickness of the flexible circuit board.

14. The backlight module according to claim 13, characterized in that: The back plate further comprises: a plurality of first buckle parts; the first buckle parts are connected to a surface of a side of the side wall away from the light guide plate, and protrude in a direction away from the side wall; The plastic frame further comprises: a plurality of second buckle parts connected to the peripheral plate; The second buckle portion is buckled with the first buckle portion.

15. The backlight module according to claim 13, characterized in that: The back plate further comprises: a plurality of first buckle parts; the first buckle parts are connected to a surface of a side of the side wall away from the light guide plate, and protrude in a direction away from the side wall; The backlight module further comprises: a front frame; the front frame at least surrounds the plastic frame; the front frame comprises: a plurality of side panels parallel to the side walls of the back panel, and at least one third buckle portion connected to the side panels; The third snap-fitting portion includes a fourth opening and a snap-fitting portion, wherein the snap-fitting portion is recessed in the direction from the side plate to the side wall; the orthographic projection of the first snap-fitting portion of the back plate on the side plate is located in the fourth opening; and the snap-fitting portion abuts against the first snap-fitting portion.

16. The backlight module according to claim 15, characterized in that: The front frame also includes: a bending portion; the bending portion is connected to a side panel parallel to the first side wall of the back panel, and is connected to an end of the side panel close to the non-light emitting side of the backlight module; the bending portion is bent in a direction close to the non-light emitting side of the backlight module.

17. A display device, characterized in that: include: A backlight module, which is the backlight module according to any one of claims 1 to 16; A display panel, located on the light-emitting side of the backlight module; A display circuit board, located on the non-light-emitting side of the backlight module; A flexible circuit board is connected to the display panel and the display circuit board.

18. The display device according to claim 17, characterized in that: The display device further includes: A buffer ring, located between the rubber frame of the backlight module and the display panel; A first adhesive layer, located between the buffer ring and the display panel; A light shielding portion extending from the side plate of the front frame through the bending portion to the non-light-emitting side of the backlight module, and the light shielding portion covers the flexible circuit board and the display circuit board; A second adhesive layer is located on the light-emitting side of the backlight module and on the front frame; The protective film is located at the light-emitting side of the backlight module and on the second adhesive layer.

19. The display device according to claim 18, characterized in that The first adhesive layer includes: a third sub-section and a fourth sub-section; The third subsection and the fourth subsection are configured to satisfy at least one of the following conditions: The third sub-portion and the fourth sub-portion are respectively located on two opposite sides of the buffer ring and are arranged corresponding to the second side wall of the back plate; Or, the dimension of the third sub-portion along its extending direction is less than or equal to the dimension of the buffer ring along the extending direction of the third sub-portion; Alternatively, a dimension of the fourth sub-portion along its extending direction is smaller than or equal to a dimension of the buffer ring along the extending direction of the fourth sub-portion.

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