Backlight module, display device and touch display device

Abstract

A backlight module (10) comprises a back plate (1), a light source (2), an optical film set (3) and a middle frame (4). The back plate (1) comprises an inner bottom frame (11) and a plurality of inner frames (12), and the inner frames (12) of the back plate (1) and the inner bottom frame (11) form a first containing space (R1). An inner bottom frame (11) of the back plate (1) comprises a first surface (11a), a second surface (11b) and a plurality of side faces, wherein the first surface (11a) and the second surface (11b) are opposite to each other, and the side faces are connected with the first surface (11a) and the second surface (11b). A plurality of inner frames (12) of the back plate (1) are correspondingly connected with a plurality of side faces of the inner bottom frame (11) and extend to one side of a first surface (11a) of the inner bottom frame (11). The light source (2) is arranged in the first accommodating space (R1). The optical film group (3) is arranged in the first accommodating space (R1). The middle frame (4) comprises a fixing part (41) surrounding a plurality of inner frames (12) of the back plate (1), and the inner frames (12) of the back plate (1) are connected with the fixing part (41) of the middle frame (4). Wherein the back plate (1) comprises a plurality of inner side frames (12) and a plurality of inner corners (13) formed by an inner bottom frame (11), and a fixing part (41) of the middle frame (4) comprises outer corners (43) correspondingly matched with the inner corners (13). Fool-proof structures are at least arranged at the positions of the inner corners (13) of the back plate (1) and the outer corners (43) of the middle frame (4), and the fool-proof structures are used for distinguishing the mounting directions of the back plate (1) and the middle frame (4).

Description

Backlight module, display device and touch display device Technical Field

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

[0002] Liquid crystal display devices are widely used display devices. Liquid crystal display devices include a backlight module and a display panel. How to quickly assemble the backlight module during the production process is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] On the one hand, a backlight module is provided. The backlight module includes a back panel, a light source, an optical film group and a middle frame. The back panel includes an inner bottom frame and a plurality of inner side frames, and the plurality of inner side frames of the back panel and the inner bottom frame form a first receiving space. The inner bottom frame of the back panel includes a first surface and a second surface relative to each other, and a plurality of side surfaces connecting the first surface and the second surface. The plurality of inner side frames of the back panel are respectively connected to the plurality of side surfaces of the inner bottom frame of the back panel, and extend toward the first surface side of the inner bottom frame of the back panel. The light source is arranged in the first receiving space. The optical film group is arranged in the first receiving space. The middle frame includes a fixing portion surrounding the plurality of inner side frames of the back panel, and the plurality of inner side frames of the back panel are connected to the fixing portion of the middle frame.

[0005] The back panel includes multiple inner corners formed by multiple inner side frames and an inner bottom frame, and the fixing portion of the middle frame includes outer corners that match the inner corners. Anti-mock structures are provided at least at the inner corners of the back panel and the outer corners of the middle frame to distinguish the installation direction of the back panel and the middle frame.

[0006] In some embodiments, the middle frame further includes an extension portion, one end of the extension portion of the middle frame is connected to the fixing portion of the middle frame, and the other end of the extension portion of the middle frame extends to a side of the inner bottom frame of the optical film group away from the back plate.

[0007] At least one inner frame among the multiple inner frames of the back plate is a selected inner frame. At least one inner corner among the multiple inner corners of the back plate is a first selected inner corner, and the first selected inner corner is formed by the selected inner frame, the inner frame adjacent thereto, and the inner bottom frame.

[0008] Among the multiple outer corners included in the fixing portion of the middle frame, at least one outer corner is a first selected outer corner, and the first selected outer corner corresponds to the first selected inner corner.

[0009] The foolproof structure includes a first identification structure arranged at a first selected inner corner position and a second identification structure arranged at a first selected outer corner position to cooperate with the first identification structure.

[0010] In some embodiments, any one of the plurality of inner frames of the back panel includes an inner surface and an outer surface facing each other, and a surface of the inner frame facing the first receiving space is the inner surface of the inner frame. The inner frame of the back panel adjacent to the selected inner frame and forming a first selected inner corner is the first adjacent inner frame.

[0011] The end of the selected inner frame of the back panel near the first selected inner corner is flush with the inner surface of the first adjacent inner frame, a first set distance is provided between the end of the first adjacent inner frame of the back panel near the first selected inner corner and the inner surface of the selected inner frame, and the ends of the selected inner frame of the back panel and the first adjacent inner frame do not touch each other. The structure of the back panel at the first selected inner corner serves as a first identification structure.

[0012] The fixing portion of the middle frame includes a first sub-fixing portion that surrounds a selected inner frame of the back panel, and a second sub-fixing portion that surrounds the first adjacent inner frame of the back panel. The second sub-fixing portion of the middle frame includes at least a first portion and a second portion. The first portion of the second sub-fixing portion of the middle frame is located outside the first adjacent inner frame of the back panel, while the second portion of the second sub-fixing portion of the middle frame is flush with the first adjacent inner frame of the back panel and connects to the first sub-fixing portion of the middle frame. The structure of the middle frame at the first selected outer corner of the back panel serves as a second identification structure.

[0013] In some embodiments, the inner bottom frame of the backplane is provided with a notch at the first selected inner corner, and the end of the first adjacent inner frame of the backplane near the first selected inner corner is flush with the notch. The backlight module further includes a protective structure provided at the first selected inner corner of the backplane.

[0014] The protective structure includes a main portion and an extension portion. The protective structure includes a main portion disposed on one side of the second surface of the inner bottom frame of the back plate. The main portion of the protective structure shields the notch of the inner bottom frame at the first selected inner corner. The first identification structure also includes the aforementioned notch and the protective structure.

[0015] In some embodiments, the protective structure further includes a first extension portion, one end of which is connected to the main body of the protective structure, and the other end of which extends to the outer surface of the selected inner frame of the back plate.

[0016] In some embodiments, the protective structure also includes a first extension portion and a second extension portion, one end of the first extension portion of the protective structure is connected to the main body of the protective structure, and the other end of the first extension portion of the protective structure extends to the outer surface of the first selected frame of the back panel; one end of the second extension portion of the protective structure is connected to the main body of the protective structure, and the other end of the second extension portion of the protective structure extends to the outer surface of the first adjacent inner frame of the back panel.

[0017] In some embodiments, at least one of the multiple inner corners of the back panel is a second selected inner corner, and the second selected inner corner of the back panel and the first selected inner corner of the back panel are respectively located at opposite ends of the selected inner frame of the back panel. At least one of the multiple outer corners of the fixed portion of the middle frame is a second selected outer corner, and the second selected outer corner of the middle frame corresponds to the second selected inner corner of the back panel.

[0018] The foolproof structure also includes a third identification structure arranged at a second selected inner corner position of the back plate and a fourth identification structure arranged at a second selected outer corner position of the middle frame and matched with the third identification structure.

[0019] In some embodiments, an inner frame adjacent to the selected inner frame of the back panel and forming a second selected inner corner is a second adjacent inner frame. The selected inner frame of the back panel includes a first portion and a second portion, the first portion of the selected inner frame of the back panel being connected to a side surface of the inner bottom frame of the back panel and extending toward a side of the first surface of the inner bottom frame of the back panel, and a set distance being provided between an end portion of the second adjacent inner frame of the back panel proximate to the second selected inner corner of the back panel and an inner surface of the first portion of the selected inner frame of the back panel.

[0020] The second portion of the selected inner frame of the back plate is bent from the end of the first portion of the selected inner frame of the back plate toward the second adjacent inner frame of the back plate and connected to the second adjacent inner frame of the back plate. The position where the selected inner frame of the back plate is bent is the second selected inner corner of the back plate.

[0021] The structure at the second selected inner corner of the back plate serves as the third identification structure. The second selected outer corner of the middle frame is a right-angle structure that matches the second selected inner corner of the back plate, and the right-angle structure serves as the fourth identification structure.

[0022] In some embodiments, the plurality of inner frames of the back panel include two selected inner frames, a first adjacent inner frame, and a second adjacent inner frame. The two selected inner frames are arranged opposite to each other, and the first adjacent inner frame and the second adjacent inner frame are arranged opposite to each other.

[0023] The multiple inner corners of the back panel include two first selected inner corners and two second selected inner corners. The aforementioned two first selected inner corners are respectively located at the two ends of the first adjacent inner frame of the back panel, and the aforementioned two second selected inner corners are respectively located at the two ends of the second adjacent inner frame of the back panel.

[0024] The multiple outer corners of the middle frame include two first selected outer corners and two second selected outer corners. The aforementioned two first selected outer corners correspond to the two first selected inner corners of the aforementioned back plate, and the two second selected outer corners of the middle frame correspond to the two second selected inner corners of the back plate.

[0025] In some embodiments, at least one of the plurality of inner frames of the back panel is a selected inner frame. A protrusion facing the second surface of the inner frame is provided on the inner bottom frame of the back panel at a position adjacent to the selected inner frame of the back panel. The protrusion of the inner bottom frame of the back panel and the selected inner frame of the back panel form a second receiving space. The protrusion of the inner bottom frame of the back panel extends along the extension direction of the selected inner frame of the back panel.

[0026] The light source includes a light bar and a light guide plate. The light bar is attached to the inner surface of the selected inner frame of the back panel, and one end of the light bar is located in the second receiving space; the light guide plate is located in the first receiving space and is located on the side of the optical film group close to the inner bottom frame of the back panel.

[0027] In some embodiments, the set direction is perpendicular to the first surface of the inner bottom frame of the back panel. The sum of the dimension of the light bar along the set direction and the distance between the light bar and the middle frame in the set direction is equal to the sum of the distance between the surface of the optical film assembly away from the inner bottom frame and the first surface of the inner bottom frame, the distance between the surface of the optical film assembly away from the inner bottom frame and the middle frame in the set direction, and the dimension of the second receiving space along the first direction.

[0028] In some embodiments, the selected inner frame of the back panel includes a first portion and a second portion, wherein the second portion of the selected inner frame bends from an end of the first portion of the selected inner frame toward a second adjacent inner frame. The selected inner frame of the back panel further includes a protrusion disposed on a side of the second portion of the selected inner frame that faces the second surface of the inner bottom frame, wherein the outer protrusion of the inner bottom frame and the orthographic projection of the protrusion of the selected inner frame on a first plane at least partially overlap. The first plane is perpendicular to the extension direction of the outer protrusion of the inner bottom frame.

[0029] In some embodiments, the material of the fixing portion of the middle frame includes metal, and the material of the extending portion of the middle frame includes rubber.

[0030] In some embodiments, the thickness of the fixing portion of the middle frame in a direction perpendicular to the inner surface of the inner frame of the back plate ranges from 0.3 mm to 0.5 mm.

[0031] In some embodiments, the middle frame further includes at least one positioning protrusion provided on a side of its extension portion facing the optical film assembly, and the positioning protrusion abuts against the light guide plate to limit the position of the light guide plate in the first receiving space.

[0032] In some embodiments, the backlight module further comprises a snap-fit ​​structure. The snap-fit ​​structure comprises at least one snap-fit ​​member disposed on one side of the outer surface of the plurality of inner frames of the back panel, and a positioning connector disposed on the middle frame corresponding to the at least one snap-fit ​​member. The at least one snap-fit ​​member cooperates with the positioning connector to securely connect the back panel to the middle frame.

[0033] In another aspect, a display device is provided, comprising: a backlight module, a rear housing, a cover plate, and a display panel as described in any one of the above embodiments.

[0034] The backlight module's backplane includes an inner bottom frame and multiple inner side frames, at least one of which is a selected inner side frame. The inner bottom frame of the backplane is provided with an outward protrusion at a position adjacent to the selected inner side frame, facing toward the second surface of the inner bottom frame. The outward protrusion of the inner bottom frame of the backplane and the selected inner side frame of the backplane form a second receiving space. The outward protrusion of the inner bottom frame of the backplane extends in the direction in which the selected inner side frame extends.

[0035] The rear shell includes an outer bottom frame and a plurality of outer side frames. The outer bottom frame of the rear shell includes a first surface and a second surface opposite to each other, and a plurality of side surfaces connecting the first surface and the second surface of the outer bottom frame. The plurality of outer side frames of the rear shell are respectively connected to the plurality of side surfaces of the outer bottom frame of the rear shell, and extend toward the first surface side of the outer bottom frame of the rear shell. At least one of the aforementioned plurality of outer side frames is a selected outer side frame, and the outer bottom frame of the rear shell is provided with an inner protrusion facing the first surface side of the outer bottom frame at a position close to the selected outer side frame. The inner protrusion of the rear shell is engaged with the outer protrusion of the back plate. The inner protrusion of the rear shell is farther away from the selected outer frame of the rear shell than the outer protrusion of the back plate. The extension direction of the inner protrusion of the rear shell is the same as the extension direction of the outer protrusion of the back plate.

[0036] The cover plate is disposed on one side of the first surface of the outer bottom frame of the rear housing, and the cover plate, the plurality of outer frames of the rear housing, and the outer bottom frame form a third receiving space, in which the backlight module is disposed. The display panel is disposed in the space between the extension portion of the middle frame and the cover plate.

[0037] In some embodiments, the middle frame further includes a connecting portion, the connecting portion of the middle frame being located on a side of the extending portion away from the fixing portion thereof, and the side of the connecting portion of the middle frame away from the extending portion thereof is connected to the display panel.

[0038] In some embodiments, a protrusion is provided in the middle portion of the outer bottom frame of the rear shell toward the second surface side of the outer bottom frame of the rear shell, and the distance between the protrusion of the outer bottom frame of the rear shell and the inner bottom frame of the back plate is greater than or equal to the distance between the rest of the outer bottom frame of the rear shell and the inner bottom frame of the back plate.

[0039] In some embodiments, a third set distance is provided between a side surface of the fixing portion of the middle frame away from the outer bottom frame of the rear shell and the outer protrusion of the outer bottom frame of the rear shell.

[0040] In another aspect, a touch display device is provided. The touch display device comprises: a display device as described in any of the above embodiments and a touch module. The touch module is integrated into the display panel or disposed on a side of the display panel away from the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0042] FIG1 is a cross-sectional structural diagram of a backlight module according to some embodiments;

[0043] FIG2 is a structural diagram of a back plate of a backlight module according to some embodiments;

[0044] FIG3A is a top view of the back plate of the backlight module according to some embodiments;

[0045] FIG3B is a top view of the back plate of the backlight module according to some other embodiments;

[0046] FIG4 is a top view of the middle frame of the backlight module according to some embodiments;

[0047] FIG5 is a structural diagram of a middle frame of a backlight module according to some embodiments;

[0048] FIG6 is an enlarged structural diagram of point A in FIG3A ;

[0049] FIG7 is an enlarged structural diagram of point B in FIG4 ;

[0050] FIG8 is a structural diagram of a back plate of a backlight module at a notch position according to some embodiments;

[0051] FIG9 is a structural diagram of a back plate and a protective structure of a backlight module according to some embodiments;

[0052] FIG10 is an enlarged structural diagram of point C in FIG9 ;

[0053] FIG11 is an enlarged top view of a second selected inner corner of a back plate of a backlight module according to some embodiments;

[0054] FIG12 is an enlarged structural diagram of a second selected inner corner position of a back plate of a backlight module according to some embodiments;

[0055] 13 is a structural diagram of a third identification structure of a back plate and a fourth identification structure of a middle frame of a backlight module according to some embodiments;

[0056] FIG14 is a structural diagram of a first identification structure of a back plate and a second identification structure of a middle frame of a backlight module according to some embodiments;

[0057] FIG15A is a cross-sectional structural diagram of a display device according to some embodiments;

[0058] FIG15B is a cross-sectional structural diagram of a touch display device according to some embodiments;

[0059] FIG16 is a cross-sectional structural diagram of a touch display device according to some other embodiments;

[0060] FIG17 is a cross-sectional structural diagram of a touch display device according to yet other embodiments;

[0061] FIG18 is a structural diagram of a display device according to some embodiments;

[0062] FIG19 is a structural diagram of a display device according to some other embodiments. DETAILED DESCRIPTION

[0063] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0064] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0065] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, 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 disclosure, unless otherwise specified, "plurality" means two or more.

[0066] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0067] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0068] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0069] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [stated condition or event] is detected" are optionally interpreted to mean "upon determining" or "in response to determining" or "upon detecting [stated condition or event]" or "in response to detecting [stated condition or event]," depending on the context.

[0070] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0071] 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.

[0072] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0073] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0074] It will be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present therebetween.

[0075] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape 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 shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0076] Some embodiments of the present disclosure provide a backlight module 10. As shown in FIG1 , the backlight module 10 includes a back panel 1, a light source 2, an optical film assembly 3, and a middle frame 4. The back panel 1 includes an inner bottom frame 11 and multiple inner frames 12. The multiple inner frames 12 of the back panel 1 and the inner bottom frame 11 form a first receiving space R1. The inner bottom frame 11 of the back panel 1 includes a first surface 11a and a second surface 11b opposite to each other, and multiple side surfaces connecting the first surface 11a and the second surface 11b of the back panel. The multiple inner frames 12 of the back panel 1 are respectively connected to the multiple side surfaces of the inner bottom frame 11 of the back panel 1 and extend toward the first surface 11a of the inner bottom frame 11. The light source 2 is disposed in the first receiving space R1. The optical film assembly 3 is disposed in the first receiving space R1. The middle frame 4 includes a fixing portion 41 surrounding the multiple inner frames 12 of the back panel 1. The multiple inner frames 12 of the back panel 1 are connected to the fixing portion 41 of the middle frame 4.

[0077] As shown in Figures 1 and 2, the back panel 1 has a groove-shaped structure and includes an inner bottom frame 11 and multiple inner frames 12. The inner bottom frame 11 includes a first surface 11a and a second surface 11b opposite to each other. The first surface 11a faces the light-emitting side of the backlight module 10, and the second surface 11b faces the backlight side of the backlight module. For example, the inner bottom frame 11 is square and has four side surfaces, and adjacent side surfaces are perpendicular to each other. The multiple inner frames 12 are respectively connected to the multiple side surfaces of the inner bottom frame 11 and extend toward the first surface 11a of the inner bottom frame 11, so that the multiple inner frames 12 of the back panel 1 and the inner bottom frame 11 form a first receiving space R1.

[0078] Exemplarily, the inner bottom frame 11 and the plurality of inner side frames 12 of the back plate 1 are an integrated structure.

[0079] In some examples, the back plate 1 is made by, for example, sheet metal processing.

[0080] For example, as shown in FIG3A , the plurality of inner frames 12 of the back panel 1 include at least one selected inner frame 121, and both ends of the selected inner frame 121 are adjacent to two inner frames 12. An inner frame 12 adjacent to the selected inner frame 121 is referred to as a first adjacent inner frame 122, and another inner frame 12 adjacent to the selected inner frame 121 is referred to as a second adjacent inner frame 123. In some examples, the first adjacent inner frame 122 and the second adjacent inner frame 123 are arranged opposite each other.

[0081] The dimension of the inner frame 12 along a direction perpendicular to the first surface 11a of the inner bottom frame 11 of the back plate 1 is referred to as the height of the inner frame 12. As shown in FIG1 , the dimension of the inner frame 12 of the back plate 1 along the direction Z shown in FIG1 is referred to as the height of the inner frame 12. The dimension of the first adjacent inner frame 122 and the second adjacent inner frame 123 along the Y direction shown in FIG3A is referred to as the length of the first adjacent inner frame 122 and the second adjacent inner frame 123. Correspondingly, the dimension of the first adjacent inner frame 122 and the second adjacent inner frame 123 along the X direction shown in FIG3A is referred to as the thickness of the first adjacent inner frame 122 and the second adjacent inner frame 123. The dimension of the selected inner frame 121 along the X direction shown in FIG3A is referred to as the length of the selected inner frame 121. Correspondingly, the dimension of the selected inner frame 121 along the Y direction shown in FIG3A is referred to as the thickness of the selected inner frame 121.

[0082] It should be noted that although the multiple inner frames 12 of the back panel 1 extend from the first surface 11a of the inner bottom frame 11 of the back panel 1, in the following description of the inner frames 12, the extension direction of the inner frames 12 refers to the length direction of the inner frames 12. Accordingly, in the side surfaces of the inner frames 12 and the inner bottom frame 11 of the back panel 1 that are connected, the length of the side surface of the inner bottom frame 11 of the back panel 1 refers to the dimension of the side surface of the inner bottom frame 11 of the back panel 1 along the length direction of the inner frame 12 connected thereto.

[0083] The multiple inner frames 12 of the back panel 1 are respectively connected to the multiple side surfaces of the inner bottom frame 11 of the back panel 1, and extend toward the side of the first surface 11a of the inner bottom frame 11. As shown in FIG3A , among the corresponding inner frames 12 and side surfaces, the length of the inner frame 12 along its extension direction (e.g., the X direction and Y direction shown in FIG3A ) is not equal to the size of the side surface of the inner bottom frame 11 of the back panel 1 to which it is adjacent along the same direction. For example, the length of the inner frame 12 is less than the length of the side surface to which it is connected, and the inner frame 12 is only connected to the middle portion of the side surface. For example, as shown in FIG3A , the length r1 of the first adjacent inner frame 122 along the Y direction in FIG3A is less than the length r2 of the side surface of the inner bottom frame 11 of the back panel 1 to which it is adjacent along the Y direction in FIG3A.

[0084] Exemplarily, as shown in FIG. 2 and FIG. 3A , the back panel 1 includes four inner frames 12 . The four inner frames 12 of the back panel 1 are all perpendicular to the inner bottom frame 11 of the back panel 1 , and any two adjacent inner frames 12 are perpendicular to each other.

[0085] The light source 2 and the optical film group 3 are arranged in the first receiving space R1 of the back panel 1. The back panel 1 surrounds the light source 2 and the optical film group 3, which can protect the light source 2 and the optical film group 3 and prevent the outside world from scratching or scraping the light source 2 and the optical film group 3, thereby affecting the quality of the backlight module 10.

[0086] The fixing portion 41 of the middle frame 4 surrounds the multiple inner frames 12 of the back panel 1. The fixing portion 41 of the middle frame 4 is arranged on the outside of the multiple inner frames 12 of the back panel 1. From the top view of the backlight module 10, as shown in Figure 4, the fixing portion 41 of the middle frame 4 is frame-shaped, and surrounds the frame structure formed by the multiple inner frames 12 of the back panel 1. Exemplarily, corresponding to the four inner frames 12 of the back panel 1, the fixing portion 41 of the middle frame 4 includes four sub-fixing portions, and each two adjacent sub-fixing portions are perpendicular.

[0087] The multiple inner frames 12 of the back panel 1 are connected to the fixing portion 41 of the middle frame 4. Exemplarily, the backlight module 10 further includes a snap-in structure. As shown in Figures 1, 2, and 5, the snap-in structure includes at least one snap-in member 16 disposed on one side of the outer surface 12b of the multiple inner frames 12 of the back panel 1, and a positioning connector 45 disposed on the middle frame 4 corresponding to the at least one snap-in member 16. The at least one snap-in member 16 cooperates with the positioning connector 45 to securely connect the back panel 1 to the middle frame 4.

[0088] In some embodiments, at least one clip 16 disposed on one side of the outer surface 12b of the multiple inner frames 12 of the back panel 1 is a conical protrusion, with the tip of the conical protrusion being referred to as the top of the conical protrusion, and the other end being the bottom of the conical protrusion. The bottom of the conical protrusion, serving as the clip 16, is fixed to the outer surface 12b of the inner frame 12 of the back panel 1. A positioning connector 45, corresponding to the at least one clip 16, is disposed on the middle frame 4 and is a connecting via extending through the fixing portion 41 of the middle frame 4. The position and size of the via match the conical protrusion disposed on the inner frame 12 of the back panel 1.

[0089] When assembling the backlight module 10, the fixing portion 41 of the middle frame 4 is placed from top to bottom along the Z direction shown in Figure 1 around the outer periphery of the multiple inner frames 12 of the back panel 1. The tips of the conical protrusions on the inner frames 12 of the back panel 1 engage with the connecting holes provided on the fixing portion 41 of the middle frame 4, thereby connecting and securing the back panel 1 to the middle frame 4. This design eliminates the need for additional fixing members, such as double-sided tape, and allows the back panel 1 and middle frame 4 to be connected and secured using their own structures, facilitating installation and improving the efficiency of backlight module 10 installation.

[0090] In some examples, as shown in FIG1 , the clip 16 provided on the inner frame 12 of the back panel 1 is a conical protrusion, and the surface of the conical protrusion on the side closest to the inner bottom frame 11 of the back panel 1 is flat, while the surface of the conical protrusion on the side away from the inner bottom frame 11 of the back panel 1 forms a certain angle with the fixing portion 41 of the middle frame 4. For example, the conical protrusion is a triangular prism, and the extension direction of the triangular prism is the same as the extension direction of the inner frame 12 on which it is located. With such a design, when the middle frame 4 is sleeved on the periphery of the back panel 1, since during the installation process, the side of the conical protrusion serving as the clamping part 16 that contacts the connecting via of the middle frame 4 is a slope, the middle frame 4 will not encounter large resistance in the process of gradually approaching the back panel 1 along the Z direction shown in Figure 1, which facilitates the installation of the back panel 1 and the middle frame 4. After the middle frame 4 is connected and fixed to the back panel 1, the surface of the side of the conical protrusion that contacts the connecting via is flat, making it difficult for the conical protrusion to fall out of the connecting via, which is beneficial to ensuring the connection stability between the back panel 1 and the middle frame 4, and further, ensuring the quality of the backlight module 10.

[0091] During the assembly process of the various components in the backlight module 10, if the outer design of the back panel 1 and the middle frame 4 is unmarked or has no differences in each position, it is impossible to determine how the back panel 1 and the middle frame 4 correspond when assembling the middle frame 4 with the back panel 1, which can easily lead to assembly errors, reducing production efficiency and increasing labor and time costs. For example, as shown in Figure 3B, the back panel 1' includes an inner bottom frame 11' and multiple inner side frames 12'. The corners formed by two adjacent inner side frames 12' of the back panel 1 and the inner bottom frame 11' are all right angles. The multiple corners of the back panel 1 have the same structure and no differences.

[0092] Based on this, as shown in Figures 2, 3A, 4, and 5, the back panel 1 includes multiple inner corners 13 formed by multiple inner side frames 12 and an inner bottom frame 11, and the fixing portion 41 of the middle frame 4 includes outer corners 43 that correspond to and match the inner corners 13. Anti-mock structures are provided at least at the positions of the inner corners 13 of the back panel 1 and the outer corners 43 of the middle frame 4 to distinguish the installation directions of the back panel 1 and the middle frame 4.

[0093] 2 and 3A, the multiple inner corners 13 of the back panel 1 are formed by the multiple inner frames 12 and the inner bottom frame 11 of the back panel 1, that is, the inner corners 13 are located at the intersection of the three planes where the inner bottom frame 11 and the two adjacent inner frames 12 are located. Exemplarily, the back panel 1 includes four inner corners 13. As shown in FIG4 and FIG5, the fixing portion 41 of the middle frame 4 includes outer corners 43 corresponding to the inner corners 13, and the outer corners 43 are located at the position where the fixing portion 41 is bent. Exemplarily, the fixing portion 41 includes four sub-fixing portions, and the outer corners 43 are formed at the intersection of two adjacent sub-fixing portions. The middle frame 4 includes four outer corners 43, and the four outer corners 43 of the middle frame 4 correspond one-to-one to the four inner corners 13 of the back panel 1.

[0094] In the backlight module, the middle frame is used to support and protect the optical films inside the backlight module. When the backlight module is applied to the display module, the middle frame is also used to support the display panel in the display module, and plays a role in maintaining the distance between the display panel and the optical film, and is connected to the front frame in the display module. The side of the middle frame facing the light-emitting side of the backlight module, that is, the side of the middle frame away from the backplate of the backlight module is called the front side of the middle frame. Correspondingly, the side of the middle frame facing the backplate of the backlight module is the back side of the middle frame. The front and back sides of the middle frame have different structures and can be distinguished intuitively by the naked eye, and it is not easy to confuse the front and back of the middle frame. When the backplate and the middle frame are assembled, the installation direction of the two is easily confused by the correspondence between the multiple inner corners of the backplate and the multiple outer corners of the middle frame.

[0095] An anti-foolproof structure is provided at at least one inner corner 13 of the back panel 1 and an outer corner 43 of the middle frame 4 corresponding to the aforementioned inner corner 13. The anti-foolproof structure is used to distinguish the installation direction of the back panel 1 and the middle frame 4. The inner corner 13 of the back panel 1 and the outer corner 43 of the middle frame 4 corresponding to the inner corner are designed to prevent fooling. When assembling the backlight module 10, the side of the middle frame 4 close to the back panel 1 and the side of the middle frame 4 away from the back panel 1 have different structures, which can be distinguished by the naked eye. It will be used to distinguish the installation directions of the back panel 1 and the middle frame 4 when the back panel 1 and the middle frame 4 are assembled.

[0096] In the backlight module 10 provided in some embodiments of the present disclosure, an anti-fool structure is provided at least at an inner corner 13 of the back panel 1 and an outer corner 43 of the middle frame 4 corresponding to the aforementioned inner corner 13. In this way, the outer design of the inner corner 13 of the back panel 1 and the outer corner 43 of the middle frame are different from the conventional design, and have corresponding anti-fool structures as identification marks. In this way, when assembling the middle frame 4 and the back panel 1, it is convenient for production personnel to quickly identify the assembly direction, thereby improving the efficiency and speed of production assembly.

[0097] Some possible implementations of the fool-proof structure are introduced below.

[0098] In some embodiments, as shown in Figure 1, the middle frame 4 includes a fixed portion 41 and an extension portion 42. One end of the extension portion 42 of the middle frame 4 is connected to its fixed portion 41, and the other end of the extension portion 42 of the middle frame 4 extends to the side of the inner bottom frame 11 of the back plate 1 away from the optical film group 3, that is, the extension portion 42 of the middle frame 4 extends from its fixed portion 41 toward the side of the first receiving space R1, and extends to the top of the first receiving space R1, enclosing a part of the first receiving space R1 and surrounding the optical film group 3.

[0099] Exemplarily, the extension 42 of the middle frame 4 is perpendicular to the fixing portion 41. The orthographic projection of the extension 42 on the optical film assembly 3 is located at the edge of the optical film assembly 3, forming a frame shape. The extension 42 of the middle frame 4 can confine the optical film assembly 3 and the light source 2 to the first receiving space R1, thus providing a position limit.

[0100] As shown in FIG1 , the upper side of the aforementioned first receiving space R1 refers to the opening side of the back plate 1 , that is, the side of the first receiving space R1 enclosed by the inner bottom frame 11 of the back plate 1 and multiple inner frames 12 away from the inner bottom frame 11 of the back plate 1 .

[0101] As shown in FIG2 and FIG3A, at least one inner frame 12 among the multiple inner frames 12 of the back plate 1 is a selected inner frame 121. At least one inner corner 13 among the multiple inner corners 13 of the back plate 1 is a first selected inner corner 131, and the first selected inner corner 131 is formed by the selected inner frame 121 and the adjacent inner frame 12 and the inner bottom frame 11.

[0102] The selected inner frame 121 is a frame selected from the plurality of inner frames 12 and having a special design (this part will be introduced later), and the first selected inner corner 131 is located at one end of the selected inner frame 121 .

[0103] As shown in Figures 4 and 5, among the multiple outer corners 43 included in the fixing portion 41 of the middle frame 4, at least one outer corner 43 is a first selected outer corner 431. The first selected outer corner 431 of the middle frame 4 corresponds to the first selected inner corner 131 of the back panel 1. The first selected outer corner 431 is arranged outside the first selected inner corner 131.

[0104] The foolproof structure includes a first identification structure B1 provided at a first selected inner corner 131 of the back plate 1 and a second identification structure B2 provided at a first selected outer corner 431 of the middle frame 4 to cooperate with the first identification structure B1 .

[0105] The first identification structure B1 refers to a special design for the structure at the first selected inner corner 131 of the back panel 1, distinguishing the appearance of the first selected inner corner 131 of the back panel 1 from the appearance of the other inner corners 13. The second identification structure B2 refers to a special design for the structure at the first selected outer corner 431 of the center frame 4, distinguishing the appearance of the first selected outer corner 431 of the center frame 4 from the appearance of the other outer corners 43. The first identification structure B1 and the second identification structure B2 serve as foolproof structures for preventing mistakes during assembly of the center frame, allowing for quick and clear identification of the correspondence between the multiple inner corners 13 of the back panel 1 and the multiple outer corners 43 of the center frame 4 during installation.

[0106] In the above embodiment, the front and back sides of the middle frame 4 can be distinguished by the extension portion 42 of the middle frame 4. For example, as shown in FIG1 , the extension portion 42 of the middle frame 4 and the fixing portion 41 of the middle frame 4 form a step-like shape on the side close to the back panel 1. The side of the middle frame 4 away from the back panel 1 and the side of the middle frame 4 close to the back panel 1 have significantly different structures. Therefore, the front and back sides of the middle frame 4 can be quickly distinguished. During assembly, the side of the middle frame 4 provided with the extension portion 42 can be aligned with the side of the optical film assembly 3 away from the inner bottom frame 11 of the back panel 1.

[0107] Next, a first identification structure B1, located at the first selected inner corner 131 of the back panel 1, and a second identification structure B2, located at the first selected outer corner 431 of the middle frame 4, are used to identify and distinguish the correspondence between the multiple inner corners 13 of the back panel 1 and the multiple outer corners 43 of the middle frame 4. Because the first identification structure B1 and the second identification structure B2 work together, simply matching them during assembly allows production personnel to quickly identify the assembly direction of the back panel 1 and middle frame 4, completing the correct assembly and improving production efficiency and speed.

[0108] In some embodiments, as shown in Figures 1, 2, and 3A, any one of the multiple inner frames 12 of the back panel 1 includes an inner surface 12a and an outer surface 12b that are opposite to each other, and the side surface of the inner frame 12 facing the first receiving space R1 is the inner surface 12a of the inner frame 12. The inner frame 12 of the back panel 1 that is adjacent to the selected inner frame 121 and forms the first selected inner corner 131 is the first adjacent inner frame 122.

[0109] As shown in FIG6 , the end of the selected inner frame 121 of the back panel 1 near the first selected inner corner 131 is flush with the inner surface 122a of the first adjacent inner frame 122. A first set distance d1 is provided between the end of the first adjacent inner frame 122 of the back panel 1 near the first selected inner corner 131 and the inner surface 121a of the selected inner frame 121. The ends of the selected inner frame 121 and the first adjacent inner frame 122 of the back panel 1 do not touch. The structure of the back panel 1 at the first selected inner corner 131 serves as the first identification structure B1.

[0110] The end of the selected inner frame 121 near the first selected inner corner 131 extends to a position flush with the inner surface 122a of the first adjacent inner frame 122. In some examples, as shown in FIG3A , a dimension r3 of the selected inner frame 121 along the first direction X is greater than or equal to a dimension r4 of the inner bottom frame 11 of the back panel 1 along the first direction X, where the first direction X is the extension direction of the selected inner frame 121. As shown in FIG6 , a first set distance d1 is defined between the end of the first adjacent inner frame 122 of the back panel 1 near the first selected inner corner 131 and the inner surface of the selected inner frame 121. This distance is not limited, as long as the end of the first adjacent inner frame 122 near the first selected inner corner 131 does not extend to a position flush with the inner surface of the selected inner frame 121.

[0111] In some examples, as shown in FIG. 3A , a dimension r1 of the first adjacent inner frame 122 along the second direction Y is smaller than a dimension r2 of the inner bottom frame 11 of the back plate 1 along the second direction Y, where the second direction Y is the extension direction of the first adjacent inner frame 122 .

[0112] Thus, as shown in Figures 3B and 6, the adjacent ends of the selected inner frame 121 and the first adjacent inner frame 122 of the back panel 1 are not connected, and there is a certain distance between them. This can be understood as a portion of the first adjacent inner frame 122 being missing from the original structure. The structure of the back panel 1 at the first selected inner corner 131 serves as the first identification structure B1.

[0113] As shown in Figures 4, 5, and 7, the fixing portion 41 of the middle frame 4 includes a first sub-fixing portion 411 that surrounds the selected inner frame 121 of the back panel 1 and a second sub-fixing portion 412 that surrounds the first adjacent inner frame 122 of the back panel 1. The second sub-fixing portion 412 of the middle frame 4 includes at least a first portion 4121 and a second portion 4122. The first portion 4121 of the second sub-fixing portion 412 of the middle frame 4 is located outside the first adjacent inner frame 122 of the back panel 1, and the second portion 4122 of the second sub-fixing portion 412 of the middle frame 4 is flush with the first adjacent inner frame 122 of the back panel 1 and is connected to the first sub-fixing portion 411 of the middle frame 4. The structure of the middle frame 4 at the first selected outer corner 431 of the back panel 1 serves as the second identification structure B2.

[0114] As shown in Figures 3A, 6 and 7, the second identification structure B2 of the middle frame 4 matches the first identification structure B1 of the back panel 1. Since the selected inner frame 121 of the back panel 1 and the first adjacent inner frame 122 are not connected to each other, one end of the first adjacent inner frame 122 is missing a part compared to the original structure, and the missing position is filled by the second part 4122 of the second sub-fixing portion 412 of the middle frame 4, that is, the first part 4121 and the second part 4122 of the second sub-fixing portion 412 respectively extend in the same direction, but the two are not on the same straight line, and the second part 4122 is concave toward the side close to the back panel 1, so that the middle frame 4 has a structure that fits with the first selected inner corner 131 of the back panel 1 at the first selected outer corner 431.

[0115] As can be seen in Figure 7, the middle frame 4 forms an inward concave structure at the first selected outer corner 431, which is different from the conventional right-angle structure, as the second identification structure B2. In this way, the first identification structure B1 and the second identification structure B2 can quickly identify the assembly directions of the multiple inner corners 13 of the back panel 1 and the multiple outer corners 43 of the middle frame 4, which is conducive to the rapid and correct completion of the assembly of the back panel 1 and the middle frame 4.

[0116] In some embodiments, as shown in Figures 2, 3A, 7, and 8, the inner bottom frame 11 of the back panel 1 is provided with a notch 14 at the position of the first selected inner corner 131, and the end of the first adjacent inner frame 122 of the back panel 1 close to the first selected inner corner 131 is flush with the aforementioned notch 14.

[0117] Exemplarily, as shown in Figures 3A and 6, the inner bottom frame 11 of the back panel 1 is not a complete square, and the inner bottom frame 11 has a notch 14 at the position of the first selected inner corner 131. Exemplarily, one side boundary of the notch 14 is flush with the end of the first adjacent inner frame 122 of the back panel 1 near the first selected inner corner 131.

[0118] The backlight module 10 also includes a protective structure 5 disposed at a first selected inner corner 131 of the backplate 1. As shown in Figures 9 and 10, the protective structure 5 is disposed on the second surface 11b of the inner bottom frame 11, shielding the notch 14 of the inner bottom frame 11 of the backplate 1 at the first selected inner corner 131. The first identification structure B1 also includes the aforementioned notch 14 and the protective structure 5.

[0119] A notch is designed at the first selected inner corner 131 of the inner bottom frame 11 of the back panel 1, which can be more clearly distinguished from other inner corners 13, making it easier to prevent mistakes during assembly. A protective structure 5 is set to cover the notch, which can prevent light leakage and block dust from entering. The protective structure 5 can also serve as a relatively obvious first identification structure B1.

[0120] Exemplarily, the protective structure 5 is a black tape, which is attached to the notch 14. The black tape can prevent reflections and is thin and low-cost. The black tape can be easily distinguished as the first identification structure B1.

[0121] In some examples, as shown in Figures 9 and 10, the protective structure 5 further includes a first extension portion 52. One end of the first extension portion 52 of the protective structure 5 is connected to its main body 51, and the other end of the first extension portion 52 extends to the outer surface 121b of the first selected frame 121 of the back panel 1.

[0122] In other examples, as shown in Figures 9 and 10, the protective structure 5 further includes a first extension portion 52 and a second extension portion 53. One end of the first extension portion 52 of the protective structure 5 is connected to its main body portion 51, and the other end of the first extension portion 52 extends to the outer surface 121b of the first selected frame 121 of the back panel 1. One end of the second extension portion 53 of the protective structure 5 is connected to its main body portion 51, and the other end of the second extension portion 53 extends to the outer surface 122b of the first adjacent inner frame 122 of the back panel 1.

[0123] By providing the first extension portion 52 and the second extension portion 53 of the protective structure 5 , the protective structure 5 can be more closely attached to the back plate 1 , and the area of ​​the protective structure 5 is increased, making the first identification structure B1 more obvious.

[0124] In some embodiments, as shown in Figures 2 and 3A, at least one of the multiple inner corners 13 of the back panel 1 is a second selected inner corner 132, and the second selected inner corner 132 of the back panel 1 and the first selected inner corner 131 of the back panel 1 are respectively located at both ends of the selected inner frame 121 of the back panel 1.

[0125] As shown in Figures 4 and 5 , among the multiple outer corners 43 included in the fixing portion 41 of the middle frame 4, at least one outer corner 43 is a second selected outer corner 432. The second selected outer corner 432 of the middle frame 4 corresponds to the second selected inner corner 132 of the back panel 1. The second selected outer corner 432 is located outside the second selected inner corner 132.

[0126] The foolproof structure also includes a third identification structure B3 provided at the second selected inner corner 132 of the back plate 1 and a fourth identification structure B4 provided at the second selected outer corner 432 of the middle frame 4 to cooperate with the third identification structure B3.

[0127] The third identification structure B3 refers to a special design for the structure at the second selected inner corner 132 of the back panel 1, distinguishing the appearance of the second selected inner corner 132 of the back panel 1 from the appearance of the other inner corners 13. The fourth identification structure B4 refers to a special design for the structure at the second selected outer corner 432 of the center frame 4, distinguishing the appearance of the second selected outer corner 432 of the center frame 4 from the appearance of the other outer corners 43. The third identification structure B3 and the fourth identification structure B4 serve as foolproof structures, preventing mistakes during the assembly of the back panel 1 and the center frame 4, allowing for quick and accurate identification of the correspondence between the multiple inner corners 13 of the back panel 1 and the multiple outer corners 43 of the center frame 4.

[0128] In the above embodiment, the fool-proof structure not only includes the first identification structure B1 at the first selected inner corner 131 of the back panel 1 and the second identification structure B2 at the first selected outer corner 431 of the middle frame 4, but also a third identification structure B3 is provided at the second selected inner corner 132 of the back panel 1, and a fourth identification structure B4 is provided at the second selected outer corner 432 of the middle frame 4. Since the first identification structure B1 and the second identification structure B2 cooperate with each other, and the third identification structure B3 and the fourth identification structure B4 cooperate with each other, the two groups of identification structures can be made to correspond to each other during the assembly process, so that production personnel can identify the assembly direction more quickly, further improving the efficiency and speed of production assembly.

[0129] In some embodiments, as shown in Figures 2 and 3A, the inner frame 12 adjacent to the selected inner frame 121 of the back panel 1 and forming the second selected inner corner 132 is the second adjacent inner frame 123. As shown in Figures 11 and 12, the selected inner frame 121 of the back panel 1 includes a first portion 1211 and a second portion 1212. The first portion 1211 of the selected inner frame 121 of the back panel 1 is connected to the side of the inner bottom frame 11 of the back panel 1 and extends toward the first surface 11a of the inner bottom frame 11 of the back panel 1. A second set distance d2 is present between the end of the second adjacent inner frame 123 of the back panel 1 near the second selected inner corner 132 of the back panel 1 and the inner surface 1211a of the first portion 1211 of the selected inner frame 121 of the back panel 1.

[0130] As shown in FIG12 , the first portion 1211 of the selected inner frame 121 is connected to the side surface of the inner bottom frame 11 of the back panel 1 . The dimension of the first portion 1211 of the selected inner frame 121 along the first direction X is equal to the dimension of the side surface of the inner bottom frame 11 along the first direction X, and the two are equal in length. The first portion 1211 of the selected inner frame 121 extends toward the first surface 11a of the inner bottom frame 11 of the back panel 1 .

[0131] A second set distance d2 is defined between the end of the second adjacent inner frame 123 of the back panel 1 near the second selected inner corner 132 of the back panel 1 and the inner surface of the selected inner frame 121 of the back panel 1. This distance is not limited, as long as the end of the second adjacent inner frame 123 near the second selected inner corner 132 does not extend to a position flush with the inner surface 121a of the selected inner frame 121. In some examples, the dimension of the second adjacent inner frame 123 along the second direction Y is smaller than the dimension of the inner bottom frame 11 of the back panel 1 along the second direction Y.

[0132] 3A and 3B , the second adjacent inner frame 123 and the first adjacent inner frame 122 of the back panel 1 are arranged opposite and parallel to each other, and have the same length, and neither extends to a position flush with the inner surface 121a of the selected inner frame 121. This can be understood as one end of the second adjacent inner frame 123 being partially missing compared to the original structure.

[0133] As shown in FIG11 , the second portion 1212 of the selected inner frame 121 of the back panel 1 is bent from the end of the first portion 1211 of the selected inner frame 121 of the back panel 1 toward the second adjacent inner frame 123 of the back panel 1 and is connected to the second adjacent inner frame 123 of the back panel 1. The position where the selected inner frame 121 of the back panel 1 is bent is the second selected inner corner 132 of the back panel 1.

[0134] As shown in Figures 3B and 11, the second part 1212 of the selected inner frame 121 of the back panel 1 is connected to the first part 1211, bent toward the second adjacent inner frame 123, and connected to the second adjacent inner frame 123 of the back panel 1, that is, the length of the second part 1212 of the selected inner frame 121 along its extension direction (see the Y direction shown in Figure 11) is equal to the distance d2 between the end of the second adjacent inner frame 12 and the inner surface 121a of the selected inner frame 121 of the back panel 1, and the second part 1212 of the selected inner frame 121 fills the missing part of one end of the second adjacent inner frame 123 relative to the original structure.

[0135] As shown in FIG. 11 , the position where the selected inner frame 121 is bent toward the second adjacent inner frame 123 forms a right angle, for example, and the corner 13 formed by the right angle and the inner bottom frame 11 serves as the second selected inner corner 132 .

[0136] It is understood that if the selected inner frame 121 does not include the second portion 1212 that bends toward the second adjacent inner frame 123, then the first receiving space R1 is not completely enclosed at the second selected inner corner 132, and an opening exists. When foreign matter is present outside the opening, it will enter the first receiving space R1 through the aforementioned opening, causing the optical film assembly 3 contained therein to be scratched. The second portion 1212 of the selected inner frame 121 of the back panel 1 is designed with a side outer edge, forming a closed corner at the second selected inner corner 132 of the back panel 1, effectively avoiding the risk of scratching the anti-film material due to the opening at the corner.

[0137] As shown in Figures 5, 9, 11, and 13, the structure at the second selected inner corner 132 of the back panel 1 serves as the third identification structure B3. As shown in Figure 13, the second selected outer corner 432 of the middle frame 4 is a right-angle structure that matches the second selected inner corner 132 of the back panel 1, and this right-angle structure serves as the fourth identification structure B4.

[0138] As shown in Figures 5, 9, 11, 13 and 14, the fixing portion 41 of the middle frame 4 also forms a right angle on the outside of the second selected inner corner 132, and the right angle serves as the second selected outer corner 432, that is, the second selected inner corner 132 and the second selected outer corner 432 are both right-angle structures, which serve as the third identification structure B3 and the fourth identification structure B4, respectively, which are different from the concave structure formed at the first selected outer corner 431 of the middle frame 4. In this way, it is easy to distinguish the installation direction and alignment according to the four marking structures to complete the assembly.

[0139] An example overall structure of the back plate 1 and the middle frame 4 is provided below.

[0140] In some embodiments, as shown in Figures 2, 3A, 4, and 5, the multiple inner frames 12 of the back panel 1 include two selected inner frames 121, a first adjacent inner frame 122, and a second adjacent inner frame 123. The aforementioned two selected inner frames 121 are arranged opposite to each other, and the aforementioned first adjacent inner frame 122 and the second adjacent inner frame 123 are arranged opposite to each other.

[0141] As shown in Figures 2, 3A, 4 and 5, the multiple inner corners 13 of the back panel 1 include two first selected inner corners 131 and two second selected inner corners 132. The aforementioned two first selected inner corners 131 are respectively located at the two ends of the first adjacent inner frame 122 of the back panel 1, and the aforementioned two second selected inner corners 132 are respectively located at the two ends of the second adjacent inner frame 123 of the back panel 1.

[0142] As shown in Figures 4 and 5, the multiple outer corners 43 of the middle frame 4 include two first selected outer corners 431 and two second selected outer corners 432. The aforementioned two first selected outer corners 431 correspond to the positions of the two first selected inner corners 131 of the aforementioned back panel 1, and the two second selected outer corners 432 of the middle frame 4 correspond to the positions of the two second selected inner corners 132 of the back panel 1.

[0143] As shown in FIG2 and FIG3A, in the structure described in the above embodiment, the back panel 1 includes two selected inner frame frames 121 arranged opposite each other, the back panel 1 includes two first selected inner corners 131 and two second selected inner corners 132, and the middle frame 4 includes two first selected outer corners 431 and two second selected outer corners 432. The corresponding outer corners 431 and inner corners 131 are referred to as a corner L. As shown in FIG1 and FIG5, the four corners L included in the backlight module 10 are respectively the first corner L1, the second corner L2, the third corner L3, and the fourth corner L4. For example, a group of corresponding first selected inner corners 131 and first selected outer corners 431 constitute the third corner L3, another group of corresponding first selected inner corners 131 and first selected outer corners 431 constitute the fourth corner L4, a group of corresponding second selected inner corners 132 and second selected outer corners 432 constitute the first corner L1, and another group of corresponding second selected inner corners 132 and second selected outer corners 432 constitute the second corner L2.

[0144] The third corner L3 and the fourth corner L4 are adjacent and located on the same side of the first selected inner frame 121. The third corner L3 and the fourth corner L4 each have matching first identification structure B1 and second identification structure B2. The first corner L1 and the second corner L2 are adjacent and located on the other side of the first selected inner frame 121. The third corner L3 and the fourth corner L4 each have matching third identification structure B3 and fourth identification structure B4. For example, the design of the third corner L3 and the fourth corner L4 is consistent, the design of the first corner L1 and the second corner L2 is consistent, and the design of the third corner L3 and the first corner L1 are inconsistent.

[0145] An anti-foolproof design is implemented at the four corners, and matching identification structures are provided. That is, the anti-foolproof structure included in the backlight module includes four groups of identification structures. This makes it easier to distinguish the installation directions of the back panel 1 and the middle frame 4 during assembly, and to distinguish the correspondence between the multiple inner corners 13 of the back panel 1 and the multiple outer corners 43 of the middle frame 4, thereby facilitating quick assembly and improving production efficiency.

[0146] In some embodiments, the backlight module is an edge-lit backlight module. The light source 2 includes a light bar 21 and a light guide plate 22 .

[0147] As shown in FIG16 , in one implementation, the light bar 21 and the light guide plate 22 are arranged such that the light guide plate 22 is located in the first receiving space R1, and the optical film group 3 is located on the side of the light guide plate 22 away from the inner bottom frame 11 '. The light bar 21 is located at one end of the light guide plate 22, and the light bar 21 is arranged on one side of the inner surface of the inner frame 12 '. Exemplarily, the light bar 21 is attached to the inner surface of the inner frame 12 ' of the back panel, and the light emitted by the light bar 21 enters the light guide plate 22 from the end of the light guide plate, and is converted into a surface light source through the light guiding effect of the light guide plate, and is emitted from the side of the light guide plate 22 away from the inner bottom frame 11 ' of the back panel.

[0148] In some examples, the light bar 21 includes a light bar substrate 211 and a plurality of light-emitting devices 212 disposed on the light bar substrate 211 , wherein the light-emitting devices 212 include but are not limited to Mini LED (Mini Light-Emitting Diode) and Micro LED (Micro Light-Emitting Diode).

[0149] As shown in Figures 15A and 15B, the backlight module 10 also includes a circuit board 6, which is arranged on the side of the second surface 11b of the inner bottom frame 11 of the back panel 1. The circuit board 6 is connected to the light bar 21 and is configured to provide a driving signal to the light bar 21 to drive the multiple light-emitting devices 212 in the light bar 21 to emit light.

[0150] Exemplarily, a conductive adhesive is provided on a side of the circuit board away from the back plate, and the conductive adhesive is configured to prevent electrostatic discharge and play an anti-radiation and anti-interference role.

[0151] It should be noted that the side of the circuit board away from the backplane includes a working area, which includes circuit components such as conductive lines. There is no contact between the components on the circuit board and the conductive adhesive (including but not limited to the absence of physical contact and / or electrical connection between the two). In some examples, the portion of the conductive adhesive opposite the working area of ​​the circuit board is provided with PET (Polyethylene Terephthalate), for example, to ensure that the components on the circuit board are not electrically connected to each other through the conductive adhesive, causing a short circuit.

[0152] The following is an explanation of the overall structure consisting of a circuit board and conductive adhesive.

[0153] The backlight module 10 is used in a display device 100. As shown in FIG15A , the display device 100 further includes a rear housing 20, which includes an outer bottom frame 201 and multiple outer frames 202. The outer bottom frame 201 includes a first surface 201a and a second surface 201b opposite to each other, and multiple side surfaces connecting the first surface 201a and the second surface 201b of the outer bottom frame 201 of the rear housing 20. The multiple outer frames 202 of the rear housing 20 are respectively connected to the multiple side surfaces of the outer bottom frame 201 of the rear housing 20 and extend toward the first surface 201a of the outer bottom frame 201 of the rear housing 20.

[0154] The rear housing 20 has a groove-shaped structure. The outer bottom frame 201 and the plurality of outer frames 202 of the rear housing 20 form a third receiving space R3 . The backlight module 10 is located in the third receiving space R3 .

[0155] As shown in Figures 15A and 15B, the width a of the light bar 21 is the dimension of the light bar 21 in a direction perpendicular to the inner bottom frame 11 of the back panel 1. The distance b between the light bar 21 and the middle frame 4 is, for example, 0.2 mm. The distance c between the surface of the optical film assembly 3 and the middle frame 4 is, for example, 0.3 mm. The distance d between the surface of the optical film assembly and the first surface 11a of the inner bottom frame 11 is. The thickness of the back panel 1 is, generally set to 0.6 mm to 1.2 mm. The dimension f of the integrated structure composed of the circuit board 6 and the conductive adhesive in a direction perpendicular to the inner bottom frame 11 of the back panel 1 is, and the distance g between the integrated structure composed of the circuit board and the conductive adhesive and the back cover is.

[0156] Exemplarily, the thickness e of the back plate 1 is, for example, 0.6 mm, 0.8 mm or 1.2 mm.

[0157] It should be understood that the thickness e of the back panel 1 mentioned herein refers to the thickness of the inner bottom frame 11 of the back panel 1 (the dimension of the inner bottom frame 11 of the back panel 1 in a direction perpendicular to the first surface 11a thereof). In some examples, the thickness of the multiple inner side frames of the back panel (the dimension of the inner side frames in a direction perpendicular to the inner surface thereof) is the same as the thickness of the inner bottom frame of the back panel.

[0158] For example, the distance g between the overall structure of the circuit board and the conductive adhesive and the rear housing is in the range of 0.6 mm to 1.2 mm. The distance g between the overall structure of the circuit board and the conductive adhesive and the rear housing is, for example, 0.6 mm, 0.9 mm, or 1.2 mm.

[0159] In some examples, as shown in FIG. 15A and FIG. 15B , a+b=c+d.

[0160] When the brightness of the backlight module 10 is required to be higher, the area of ​​the light bar 21 needs to be increased, so that the number of the plurality of light emitting devices 212 increases. In this way, the width a of the light bar 21 increases, and the volume of the required first receiving space R1 increases.

[0161] As shown in Figure 16, under the premise of keeping the value of c+d+e+f+g=k unchanged, the volume of the first receiving space R1 increases. If c, e, f, and k are kept unchanged, the distance g between the overall structure composed of the circuit board 6 and the conductive adhesive and the rear shell 20 is reduced. In this way, the distance between the circuit board 6 and the rear shell 20 is too close, and the risk of interference between the components of the circuit board 6 and the rear shell 20 increases. In addition, as the volume of the first receiving space R1 increases, the thickness of the light guide plate 22 also increases, the light effect is weakened, and the light output effect of the backlight module 10 is affected.

[0162] As shown in FIG17 , another way to place the light bar 21 is to cut a groove W on the inner bottom frame of the back panel 1″ and place one end of the light bar 21 into the groove W. However, this reduces the thickness of the inner bottom frame at the position of the groove W, which reduces the strength, concentrates stress, and is prone to deformation.

[0163] In the backlight module 10 provided in some embodiments of the present application, the back panel 1 adopts the design shown in Figures 15A and 15B. While ensuring that the width of the light strip is increased to improve the brightness of the backlight module, the thickness of the backlight module will not be increased, and the distance between the circuit board and the rear shell will not be reduced. At the same time, compared with the structure shown in Figure 17, the strength of the back panel is guaranteed and the problem of deformation of the back panel is avoided.

[0164] The width of the light bar mentioned here refers to the size of the light bar in a direction perpendicular to the inner bottom frame of the back plate.

[0165] In some embodiments, as shown in Figures 1, 15A, and 15B, the inner bottom frame 11 of the back panel 1 is provided with a protruding portion 15 facing the second surface 11b of the inner bottom frame 11 of the back panel 1 near the selected inner frame 121 of the back panel 1. The protruding portion 15 of the inner bottom frame 11 of the back panel 1 and the selected inner frame 121 of the back panel 1 form a second receiving space R2. The protruding portion 15 of the inner bottom frame 11 of the back panel 1 extends along the extension direction of the selected inner frame 121 of the back panel 1. One end of the light bar 21 is located in the second receiving space R2.

[0166] The inner bottom frame 11 of the back panel 1 protrudes outward at a position close to the selected inner frame 121, thereby forming a second receiving space R2. It should be noted that the outer protrusion 15 is a part of the inner bottom frame 11, the first receiving space R1 includes the second receiving space R2, and the first receiving space R1 of the back panel 1 in Figures 1, 15A, and 15B is larger than the first receiving space R1 of the back panel 1 with a conventional design in Figure 16. One end of the light bar 21 is located in the second receiving space R2. In this way, even if the thickness a of the light bar 21 increases, since the outer protrusion 15 is only provided at a position close to the selected inner frame 121 of the inner bottom frame 11 of the back panel 1, the light bar 21 can be placed in the second receiving space R2 without affecting the distance c, the distance d and the thickness e of the back panel 1.

[0167] Therefore, the c, e, f, and k values ​​of the back panel 1 do not need to be changed, and the distance g between the overall structure composed of the circuit board and the conductive adhesive and the back shell remains unchanged. That is, the design of widening the light strip is taken into account without reducing the distance between the circuit board and the back shell, thereby meeting the brightness requirements of the backlight module, and not increasing the risk of interference between the components of the circuit board and the back shell, and not increasing the structural and functional risks of the backlight module, thereby improving the quality of the backlight module.

[0168] It should be noted that the light strip 21 is in the shape of an elongated strip and is attached to the inner surface of the selected inner frame 121 of the back panel 1. The protruding portion 15 of the back panel 1 is also in the shape of an elongated strip, and the extension direction of the protruding portion 15 is consistent with the extension direction of the light strip 21 and the extension direction of the selected inner frame 121.

[0169] In some embodiments, as shown in FIG. 1 , FIG. 15A , and FIG. 15B , the backlight module 10 further includes a reflective sheet 23 . The reflective sheet 23 is disposed between the light guide plate 22 and the inner bottom frame 11 of the back plate 1 for reflecting light.

[0170] In some embodiments, as shown in FIG1 , FIG15A , and FIG15B , the set direction Z is perpendicular to the first surface 11a of the inner bottom frame 11 ; the sum of the dimension of the light bar 21 along the set direction Z (the width a of the light bar 21 ) and the distance b between the light bar 21 and the middle frame 4 (the extension 42 of the middle frame 4 ) in the set direction is equal to the sum of the distance d between the surface of the optical film assembly 3 away from the inner bottom frame 11 and the first surface 11a of the inner bottom frame 11 , the distance c between the surface of the optical film assembly 3 away from the inner bottom frame 11 and the middle frame 4 (the extension 42 of the middle frame 4 ) in the set direction, and the dimension h of the second receiving space R2 along the set direction. That is, a+b=c+d+h.

[0171] Exemplarily, the distance d between the surface of the optical film assembly 3 away from the inner bottom frame 11 and the first surface 11 a of the inner bottom frame 11 is the sum of the thickness of the optical film assembly 3 , the thickness of the light guide plate 22 , and the thickness of the reflective sheet.

[0172] In some examples, the light source included in the display module includes a light bar 21, and accordingly, the back panel 1 includes a selected inner frame 121, and the inner bottom frame 11 of the back panel 1 has an outer protrusion 15. For the design of a single-sided light bar, an anti-foolproof structure may not be set. The installation direction of the back panel 1 and the middle frame 4 can be distinguished by the position of the light bar 21 and the position of the outer protrusion 15, thereby achieving quick assembly.

[0173] In some examples, the light source included in the display module includes two light strips 21, and the two light strips 21 are respectively arranged on opposite sides of the back panel 1. Accordingly, the back panel 1 includes two selected inner frame frames 121 arranged opposite to each other, and the inner bottom frame 11 of the back panel 1 has two outer protrusions. For the design of double-sided light strips, it is impossible to distinguish the installation direction of the back panel 1 and the middle frame 4 by the position of the light strips and the position of the outer protrusions. At this time, the fool-proof design mentioned above is needed.

[0174] In some embodiments, as shown in FIG. 11 , the selected inner frame 121 includes a first portion 1211 and a second portion 1212 ; the second portion 1212 of the selected inner frame 121 is bent from the end of the first portion 1211 of the selected inner frame 121 toward the second adjacent inner frame 123 .

[0175] The selected inner frame 121 also includes a protrusion 1213 arranged on the side of the second surface 11b of the inner bottom frame 11 of the back panel 1 facing the second part 1212 thereof, and the outer protrusion 15 of the inner bottom frame 11 and the positive projection of the protrusion 1213 of the selected inner frame 121 on the first plane at least partially overlap, and the first plane is perpendicular to the extension direction of the outer protrusion 15 of the inner bottom frame 11 of the back panel 1.

[0176] The second portion 1212 and the convex portion 1213 of the selected inner frame 121 are in the same plane, that is, the second portion 1212 of the selected inner frame 121 has a downward protrusion. Since the inner bottom frame 11 has an outer convex portion 15, if the bottom of the second portion 1212 of the selected inner frame 121 does not have the convex portion 1213, the outer convex portion 15 will leave a gap near the second portion 1212 of the selected inner frame 121, causing light leakage and external dust to enter. The outer convex portion 15 of the inner bottom frame 11 of the back panel 1 and the convex portion 1213 of the selected inner frame 121 have at least partial overlap in their orthographic projections on the first plane. The convex portion 1213 at the bottom of the second portion 1212 of the selected inner frame 121 can at least cover a portion of the gap formed by the outer convex portion 15 of the back panel 1, thereby achieving a certain effect of preventing light leakage and blocking dust from entering.

[0177] In some examples, as shown in FIG12 , the convex portion 1213 at the bottom of the second portion 1212 of the inner frame 121 is selected to completely block the gap formed by the outer convex portion 15 of the inner bottom frame 11 , thereby achieving a sealing effect and further blocking light and dust.

[0178] In some embodiments, as shown in Figures 1, 15A, and 15B, the material of the middle frame 4 is metal, for example, called a middle iron frame. The extension part and the fixing part of the middle frame 4 are made of metal, which has the characteristic of small thickness. However, since metal reflects light, the light emitted by the optical film group is easily concentrated and bright lines appear at the extension part 42 after being reflected by the middle frame. Black tape needs to be attached to prevent reflected light, which increases the process and cost.

[0179] In other embodiments, as shown in Figures 1, 15A, and 15B, the material of the middle frame 4 is rubber, for example, called a middle rubber frame. Compared with the middle iron frame, the middle rubber frame is thicker, has lower strength, and is easy to deform, but the middle rubber frame does not reflect light.

[0180] In some embodiments, as shown in FIG. 1 , FIG. 15A , and FIG. 15B , the material of the fixing portion 41 of the middle frame 4 includes metal, and the material of the extending portion 42 of the middle frame 4 includes rubber.

[0181] The middle frame 4 adopts an integrated structure of glue and iron, and the fixing part 41 surrounding the back panel 1 is made of metal material, which can reduce the frame width of the module while ensuring a stable connection; the extension part 42 on the light-emitting side is made of rubber material, which can effectively avoid the bright line problem caused by reflected light.

[0182] In the backlight module, the middle frame 4 is made of a combination of metal and rubber. The fixing portion 41 of the middle frame 4 is made of metal, and the extension portion 42 of the middle frame 4 is made of rubber. This can combine the advantages of metal and rubber. Since rubber absorbs light and does not reflect it, the extension portion 42 is formed by rubber, so there will be no bright spotlight line formed by light reflection at the position where the extension portion overlaps with the optical film group. In addition, it can be applied to TLCM (Touch Liquid Crystal Module) products that are first attached and then assembled.

[0183] In some examples, the middle frame 4 with an integrated adhesive-iron structure is applied to TLCM products that are fixed with VHB (Very High Bond, super-strong adhesive double-sided tape) and are pasted first and then assembled.

[0184] The "stick first, assemble later" process described here means that when assembling a display device, for example, including a backlight module, a display panel, and a touch module, the touch module and the display panel are first bonded together to form a touch display panel, and then the touch display panel and the backlight module are combined to form a touch display module.

[0185] At the same time, due to the high strength of metal, the thickness of the iron frame is smaller than that of the plastic frame under the same strength requirements. Therefore, the use of metal to form the fixing portion 41 can reduce the thickness of the fixing portion 41, thereby narrowing the module frame. The metal frame is not easy to deform and has better stability. For example, as shown in Figures 15A and 15B, the metal material of the fixing portion 41 of the middle frame 4 makes the thickness d4 of the fixing portion 41 of the middle frame 4 significantly reduced while ensuring the same connection strength and support effect compared to the plastic frame. It can be understood that with such a design, when the backlight module is applied to the display module, the frame width of the display module can be significantly reduced.

[0186] By way of example, the metal forming the fixing portion 41 is iron, steel, or the like.

[0187] In some examples, as shown in FIG. 1 , FIG. 15A , and FIG. 15B , the fixing portion 41 and the extending portion 42 of the middle frame 4 are an integral structure, and the middle frame 4 is manufactured by integral molding in a relatively simple process, for example, by successively pouring metal and rubber into a mold.

[0188] Exemplarily, as shown in FIG. 1 , FIG. 15A , and FIG. 15B , the thickness of the fixing portion 41 of the middle frame 4 in a direction perpendicular to the inner surface 12 a of the inner frame 12 of the back plate 1 ranges from 0.3 mm to 0.5 mm.

[0189] In some examples, the thickness of the fixing portion 41 of the middle frame 4 in a direction perpendicular to the inner surface 12 a of the inner frame 12 of the back plate 1 is, for example, 0.3 mm, 0.4 mm, or 0.5 mm.

[0190] In some embodiments, as shown in Figures 1 and 4, the middle frame 4 further includes at least one positioning protrusion 44 provided on the side of its extension portion 42 facing the optical film group 3. The positioning protrusion 44 abuts against the light guide plate 22 to limit the position of the light guide plate 22 in the first receiving space R1.

[0191] The positioning protrusions 44 abut against the light guide plate 22 to limit the movement of the light guide plate 22 in the Z direction as shown in Figure 1. Since the positioning protrusions 44 abut against the light guide plate 22, the light guide plate 22 and the reflective sheet 23 are more closely attached, and further, the movement of the light guide plate 22 in the Y direction as shown in Figure 1 can also be limited.

[0192] The positioning protrusion 44 serves as a fixing structure and plays a limiting role to prevent the light guide plate and the optical film assembly from moving back and forth during the assembly process, thereby causing their positions to shift and become loose, resulting in poor light output effects.

[0193] For example, a cross-section of the positioning protrusion 44 is taken along a plane perpendicular to the surface of the fixing portion 41 of the middle frame 4 near the inner bottom frame 11 of the back plate 1. The cross-sectional shape of the positioning protrusion 44 includes, but is not limited to, a trapezoidal, square, rectangular, or triangular shape. In some examples, the positioning protrusion 44 is a solid structure. In other examples, as shown in FIG1 , the positioning protrusion 44 is a hollow structure.

[0194] Some embodiments of the present disclosure further provide a display device 100. As shown in Figures 15A, 18, and 19, the display device 100 includes: a backlight module 10, a rear housing 20, a cover plate 30, and a display panel 40 as described in any of the above embodiments.

[0195] Exemplarily, the display device 100 includes a display module, which includes, for example, a backlight module 10 and a display panel 40 .

[0196] The backplane 1 of the backlight module 10 includes an inner bottom frame 11 and multiple inner frames 12. At least one of the multiple inner frames 12 of the backplane 1 is a selected inner frame 121. A protruding portion 15 facing toward the second surface 11b of the inner bottom frame 11 of the backplane 1 is provided near the selected inner frame 121. The protruding portion 15 of the inner bottom frame 11 of the backplane 1 and the selected inner frame 121 of the backplane 1 form a second receiving space R2. The protruding portion 15 of the inner bottom frame 11 of the backplane 1 extends along the extension direction of the selected inner frame 121.

[0197] The rear case 20 includes an outer bottom frame 201 and multiple outer side frames 202. The outer bottom frame 201 of the rear case 20 includes a first surface 201a and a second surface 201b that are opposite to each other, and multiple side surfaces connecting the first surface 201a and the second surface 201b of the outer bottom frame 201 of the rear case 20. The multiple outer side frames 202 of the rear case 20 are respectively connected to the multiple side surfaces of the outer bottom frame 201 of the rear case 20 and extend toward the first surface 201a of the outer bottom frame 201 of the rear case 20.

[0198] At least one of the multiple outer frames 202 of the rear housing 20 is a selected outer frame 2021. An inner protrusion 203 facing toward the first surface 201a of the outer frame 201 is provided on the outer bottom frame 201 of the rear housing 20, near the selected outer frame 2021. The inner protrusion 203 of the rear housing 20 engages with the outer protrusion 15 of the back panel 1. The inner protrusion 203 of the rear housing 20 is further away from the selected outer frame 2021 of the rear housing 20 than the outer protrusion 15 of the back panel 1. The inner protrusion 203 of the rear housing 20 extends in the same direction as the outer protrusion 15 of the back panel 1.

[0199] The cover plate 30 is disposed on one side of the first surface 201a of the outer bottom frame 201 of the rear housing 20. The cover plate 30, the multiple outer frames 202 of the rear housing 20, and the outer bottom frame 201 form a third receiving space R3. The backlight module 10 is disposed in the third receiving space R3. The display panel 40 is disposed in the space between the extension portion 42 of the middle frame 4 and the cover plate 30.

[0200] The rear shell 20 and the cover plate 30 surround the backlight module 10 and the display panel 40 to provide protection. Since the outer frame 201 of the rear shell 20 is provided with an inner convex portion 203 corresponding to the outer convex portion 15 of the inner bottom frame 11 of the back plate 1, that is, the outer bottom frame 201 of the rear shell 20 is concave inward, and the inner bottom frame 11 of the back plate 1 is convex outward (the inner convex portion 203 of the outer bottom frame 201 of the rear shell 20 protrudes toward the interior of the third receiving space R3, and the outer convex portion 15 of the inner bottom frame 11 of the back plate 1 protrudes in a direction away from the first receiving space R1 and toward the outer bottom frame 201 of the rear shell 20). The rear shell 20 and the back plate 1 are both bent toward each other, so that the inner convex portion 203 of the rear shell 20 is locked with the outer convex portion 15 of the back plate 1, thereby increasing the stability of the display device 100.

[0201] In some embodiments, as shown in Figures 1, 15A, and 15B, the middle frame 4 further includes a connecting portion 46. The connecting portion 46 of the middle frame 4 is located on a side of the extending portion 42 away from the fixing portion 41. The side of the connecting portion 46 of the middle frame 4 away from the extending portion 42 is connected to the display panel 40. The connecting portion 46 of the middle frame 4 is used to fix the display panel 40.

[0202] Exemplarily, the display panel 40 is a liquid crystal display panel.

[0203] In some embodiments, as shown in Figures 15A and 15B, a protrusion 203 facing the second surface 201b of the outer bottom frame 201 of the rear shell 20 is provided in the middle part of the outer bottom frame 201 of the rear shell 20, and the distance between the protrusion 203 of the outer bottom frame 201 of the rear shell 20 and the inner bottom frame 201 of the back plate 1 is greater than or equal to the distance between the rest of the outer bottom frame 201 of the rear shell 20 and the inner bottom frame 11 of the back plate 1.

[0204] By providing an outer protrusion 203 in the middle of the outer bottom frame 201 of the rear shell 20, the accommodating space of the circuit board 6 is increased, and further, the problem of abnormality of the circuit board 6 caused by the circuit board 6 and the components thereon contacting the rear shell 20 is effectively avoided.

[0205] Exemplarily, the circuit board 6 includes but is not limited to a PBCA (Printed Circuit Board Assembly, a printed circuit board that has undergone the entire manufacturing process of SMT (Surface Mounted Technology) mounting or DIP (Dual In-line Package) plug-in) and an FPC (Flexible Printed Circuit).

[0206] In some embodiments, a third set distance d3 is present between a side surface of the fixing portion 41 of the middle frame 4 away from the outer bottom frame 201 of the rear case 20 and the outer protruding portion 203 of the outer bottom frame 201 of the rear case 20 .

[0207] When the backlight module is applied to a display device, the distance between the middle frame 4 and the rear housing 20 of the display device should not be too small to facilitate installation. If the distance is too small, the backlight module will not be easily placed in the rear housing. If the distance is too large, the width of the display device's border will increase. As can be understood, when the border width increases, the screen-to-body ratio of the display device will decrease accordingly, which does not meet actual usage requirements.

[0208] A middle frame that is made of glue and iron is adopted, and the fixed part of the middle frame is made of metal material, so that the thickness d4 of the fixed part of the middle frame is reduced compared with the use of a glue structure. Further, it is ensured that the border width of the display device meets the narrow border design requirements of the display device, increases the screen size ratio in the display device, and optimizes the visual experience of the display device.

[0209] For example, when the middle frame 4, which employs an integrated adhesive-iron structure, is used in a display device 100, as shown in FIG15A , the cover plate 30 and the rear housing 20, the display panel 40 and the cover plate 30, the optical film assembly 3 and the back plate 1, and the back plate 1 and the circuit board 6 are bonded together using adhesives. Examples of the adhesives include double-sided tape, PSA (Pressure Sensitive Adhesive), OCA (Optically Clear Adhesive), and VHB.

[0210] In some examples, the cover plate 30 and the rear case 20 are bonded by VHB.

[0211] In other examples, the optical film set 3 includes a plurality of optical films, and any two adjacent optical films of the plurality of optical films are bonded together by OCA.

[0212] Some embodiments of the present disclosure further provide a touch display device 200. As shown in Figures 15B, 18, and 19, the touch display device 200 includes: the display device 100 described in any of the above embodiments; and a touch module 50. The touch module 50 is integrated within the display panel 40 or disposed on a side of the display panel 40 away from the backlight module 10.

[0213] In some embodiments, the touch display device is a vehicle-mounted touch display device, which is used in a vehicle.

[0214] In some embodiments, as shown in FIG15A , the display device 100 is, for example, an LCM (Liquid Crystal Module), and as shown in FIG15B , the touch display device 200 is, for example, a TLCM. The appearance of the display device 100 and the touch display device 200 are, for example, shown in FIG18 and FIG19 . There is no difference in appearance between the two. The difference between the display device 100 and the touch display device 200 lies in whether they include a touch module 50, that is, whether they have a touch function.

[0215] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A backlight module, comprising: A back plate comprising an inner bottom frame and a plurality of inner side frames, wherein the plurality of inner side frames and the inner bottom frame form a first receiving space; The inner bottom frame includes a first surface and a second surface opposite to each other, and a plurality of side surfaces connecting the first surface and the second surface; the plurality of inner side frames are respectively connected to the plurality of side surfaces of the inner bottom frame and extend toward the first surface of the inner bottom frame; a light source, disposed in the first receiving space; An optical film assembly is disposed in the first receiving space; a middle frame, comprising a fixing portion surrounding a plurality of inner frames of the back plate, wherein the plurality of inner frames of the back plate are connected to the fixing portion of the middle frame; In which, the back panel includes multiple inner corners formed by multiple inner frames and the inner bottom frame, and the fixing portion of the middle frame includes outer corners corresponding to and matching the inner corners; an anti-fool structure is provided at least at the inner corners of the back panel and the outer corners of the middle frame, and the anti-fool structure is used to distinguish the installation direction of the back panel and the middle frame.

2. The backlight module according to claim 1, wherein: The middle frame further includes an extension portion, one end of the extension portion is connected to the fixing portion, and the other end of the extension portion extends to a side of the optical film assembly away from the inner bottom frame; At least one inner frame among the plurality of inner frames is a selected inner frame; At least one of the plurality of inner corners is a first selected inner corner, and the first selected inner corner is formed by the selected inner frame, an inner frame adjacent thereto, and the inner bottom frame; Among the plurality of outer corners included in the fixing portion of the middle frame, at least one outer corner is a first selected outer corner, and the first selected outer corner corresponds to the first selected inner corner; The fool-proof structure includes a first identification structure provided at the first selected inner corner position and a second identification structure provided at the first selected outer corner position to cooperate with the first identification structure.

3. The backlight module according to claim 2, wherein: Any one of the plurality of inner frames comprises an inner surface and an outer surface opposite to each other, and a surface of the inner frame facing the first receiving space is the inner surface of the inner frame; The inner frame adjacent to the selected inner frame and forming a first selected inner corner is a first adjacent inner frame; The end of the selected inner frame near the first selected inner corner is flush with the inner surface of the first adjacent inner frame; a first set distance is provided between the end of the first adjacent inner frame near the first selected inner corner and the inner surface of the selected inner frame; the ends of the selected inner frame and the first adjacent inner frame do not touch each other; the structure of the back panel at the first selected inner corner serves as the first identification structure; The fixing portion of the middle frame includes a first sub-fixing portion surrounding the selected inner frame and a second sub-fixing portion surrounding the first adjacent inner frame, the second sub-fixing portion includes at least a first part and a second part, the first part of the second sub-fixing portion is located on the outside of the first adjacent inner frame, the second part of the second sub-fixing portion is flush with the first adjacent inner frame and connected to the first sub-fixing portion; the structure of the middle frame at the first selected outer corner serves as the second identification structure.

4. The backlight module according to claim 3, wherein: The inner bottom frame is provided with a notch at the position of the first selected inner corner, and the end of the first adjacent inner frame close to the first selected inner corner is flush with the notch; The backlight module further includes a protective structure disposed at the first selected inner corner position; The protective structure includes a main body and an extension portion, wherein the protective structure includes the main body provided on one side of the second surface of the inner bottom frame, and the main body shields the notch; The first identification structure further includes the notch and the protective structure.

5. The backlight module according to claim 4, wherein: The protective structure further includes a first extension portion, one end of the first extension portion is connected to the main body portion, and the other end of the first extension portion extends to the outer surface of the selected inner frame; Alternatively, the protective structure also includes a first extension portion and a second extension portion, one end of the first extension portion is connected to the main body portion, and the other end of the first extension portion extends to the outer surface of the first selected frame; one end of the second extension portion is connected to the main body portion, and the other end of the second extension portion extends to the outer surface of the first adjacent inner frame.

6. The backlight module according to any one of claims 2 to 5, wherein: At least one of the plurality of inner corners is a second selected inner corner, and the second selected inner corner and the first selected inner corner are respectively located at two ends of the selected inner frame; Among the plurality of outer corners included in the fixing portion of the middle frame, at least one outer corner is a second selected outer corner, and the second selected outer corner corresponds to the second selected inner corner; The foolproof structure further includes a third identification structure provided at the second selected inner corner position and a fourth identification structure provided at the second selected outer corner position and coordinated with the third identification structure.

7. The backlight module according to claim 6, wherein: The inner frame adjacent to the selected inner frame and forming the second selected inner corner is a second adjacent inner frame; The selected inner frame includes a first portion and a second portion, the first portion of the selected inner frame being connected to a side surface of the inner bottom frame and extending toward a side of the first surface of the inner bottom frame, and a second set distance being formed between an end portion of the second adjacent inner frame adjacent to the second selected inner corner and an inner surface of the first portion of the selected inner frame; The second portion of the selected inner frame is bent from the end of the first portion of the selected inner frame toward the second adjacent inner frame and connected to the second adjacent inner frame; the position where the selected inner frame is bent is the second selected inner corner; The structure of the back plate at the second selected inner corner serves as the third identification structure; The second selected outer corner of the middle frame is a right-angle structure matching the second selected inner corner, and the right-angle structure serves as the fourth identification structure.

8. The backlight module according to any one of claims 2 to 7, wherein: The plurality of inner frames include two selected inner frames, a first adjacent inner frame and a second adjacent inner frame, the two selected inner frames are arranged opposite to each other, and the first adjacent inner frame and the second adjacent inner frame are arranged opposite to each other; The multiple inner corners include two first selected inner corners and two second selected inner corners, the two first selected inner corners are respectively located at two ends of the first adjacent inner frame, and the two second selected inner corners are respectively located at two ends of the second adjacent inner frame; The plurality of outer corners include two first selected outer corners and two second selected outer corners, the two first selected outer corners respectively corresponding to the two first selected inner corners, and the two second selected outer corners respectively corresponding to the two second selected inner corners.

9. The backlight module according to any one of claims 1 to 8, wherein: At least one of the plurality of inner frames is a selected inner frame; the inner bottom frame is provided with an outer protrusion facing toward a side of the second surface of the inner bottom frame at a position close to the selected inner frame, the outer protrusion of the inner bottom frame and the selected inner frame forming a second receiving space; the outer protrusion of the inner bottom frame extends along an extension direction of the selected inner frame; The light source includes a light bar and a light guide plate. The light bar is attached to the inner surface of the selected inner frame, and one end of the light bar is located in the second receiving space. The light guide plate is located in the first receiving space and is located on the side of the optical film group close to the inner bottom frame.

10. The backlight module according to claim 9, wherein: The setting direction is perpendicular to the first surface of the inner bottom frame; The sum of the size of the light bar along the set direction and the distance between the light bar and the middle frame in the set direction is equal to the sum of the distance between the surface of the optical film group away from the inner bottom frame and the first surface of the inner bottom frame, the distance between the surface of the optical film group away from the inner bottom frame and the middle frame in the set direction, and the size of the second receiving space along the first direction.

11. The backlight module according to claim 9, wherein: The selected inner frame includes a first portion and a second portion; the second portion of the selected inner frame is bent from an end portion of the first portion of the selected inner frame toward the second adjacent inner frame; The selected inner frame also includes a convex portion arranged on the side of the second part facing the second surface of the inner bottom frame, and the outer convex portion of the inner bottom frame and the orthographic projection of the convex portion of the selected inner frame on the first plane at least partially overlap, and the first plane is perpendicular to the extension direction of the outer convex portion of the inner bottom frame.

12. The backlight module according to any one of claims 1 to 11, wherein: The material of the fixing portion of the middle frame includes metal; The material of the extension portion of the middle frame includes rubber.

13. The backlight module according to claim 12, wherein: The thickness of the fixing portion of the middle frame in a direction perpendicular to the first surface of the inner frame of the back plate ranges from 0.3 mm to 0.5 mm.

14. The backlight module according to any one of claims 9 to 13, wherein: The middle frame further includes at least one positioning protrusion provided on a side of the extension portion facing the optical film assembly, and the at least one positioning protrusion abuts against the light guide plate to limit the position of the light guide plate in the first receiving space.

15. The backlight module according to any one of claims 9 to 14, wherein: The backlight module further includes: The clamping structure includes at least one clamping member arranged on one side of the outer surface of multiple inner frames of the back panel, and a positioning connecting member arranged on the middle frame corresponding to the at least one clamping member; the at least one clamping member cooperates with the positioning connecting member to connect and fix the back panel to the middle frame.

16. A display device comprising: The backlight module according to claims 1 to 15; The back plate of the backlight module includes an inner bottom frame and a plurality of inner frames, at least one of the plurality of inner frames being a selected inner frame; the inner bottom frame is provided with an outer protrusion facing toward a side of a second surface of the inner bottom frame at a position close to the selected inner frame, the outer protrusion of the inner bottom frame and the selected inner frame forming a second receiving space; the outer protrusion of the inner bottom frame extends along an extension direction of the selected inner frame; A rear shell, comprising an outer bottom frame and a plurality of outer frames, wherein the outer bottom frame comprises a first surface and a second surface opposite to each other, and a plurality of side surfaces connecting the first surface and the second surface of the outer bottom frame; the plurality of outer frames are respectively connected to the plurality of side surfaces of the outer bottom frame and extend toward the first surface of the outer bottom frame; at least one of the plurality of outer frames is a selected outer frame, and the outer bottom frame is provided with an inner convex portion facing the first surface of the outer bottom frame at a position close to the selected outer frame; the inner convex portion of the rear shell is engaged with the outer convex portion of the back plate; the inner convex portion of the rear shell is farther away from the selected outer frame than the outer convex portion of the back plate; the extension direction of the inner convex portion of the rear shell is the same as the extension direction of the outer convex portion of the back plate; a cover plate, disposed on one side of the first surface of the outer bottom frame, wherein the cover plate, the plurality of outer frames of the rear housing, and the outer bottom frame form a third receiving space, and the backlight module is disposed in the third receiving space; The display panel is arranged in the space between the extension portion of the middle frame and the cover plate.

17. The display device according to claim 16, wherein: The middle frame further includes a connecting portion, which is located on a side of the extending portion away from the fixing portion; and the side of the connecting portion away from the extending portion is connected to the display panel.

18. The display device according to claim 16 or 17, wherein: A third set distance is provided between a side surface of the fixing portion of the middle frame away from the outer bottom frame and the outer protruding portion of the outer bottom frame.

19. A touch display device, comprising: The display device according to any one of claims 16 to 18; The touch module is integrated into the display panel, or is arranged on a side of the display panel away from the backlight module.

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