Backlight module and display module

Abstract

The embodiment of the invention provides a backlight module and a display module. The backlight module comprises a back plate, a light guide plate, at least one light bar and an optical film material assembly. The back plate is provided with a containing cavity, and the light guide plate is located in the containing cavity. The at least one light bar is located in the containing cavity and right faces the side wall of the light guide plate, the light emitting direction of the light bar faces the light guide plate, the light bar comprises a circuit substrate and a light-emitting element, and each circuit substrate is provided with at least one hanging part. The optical film material assembly is located on the light emitting side of the light guide plate, the optical film material assembly comprises a plurality of optical films stacked on the light emitting side of the light guide plate, and at least one optical film arranged close to the light guide plate is provided with a first hanging lug matched with the hanging part so as to limit the optical film. According to the backlight module, the problem that the movement of the optical film is difficult to limit by using the back plate due to the limitation of the height of the light bar on one side, where the light bar is mounted, of the backlight module can be solved.

Description

Technical Field

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

[0002] LCD (Liquid Crystal Display) has many advantages such as thin body, power saving, no radiation, etc., and has been widely used. Most of the LCDs on the market are backlight type, which includes a liquid crystal panel and a backlight module. The working principle of the liquid crystal panel is to place liquid crystal molecules between two parallel glass substrates, and control the liquid crystal molecules to change direction through circuits to refract the light of the backlight module to produce a picture. Since the liquid crystal panel itself does not emit light, it needs the light source provided by the backlight module to display the image normally. Therefore, the backlight module becomes one of the key components of the LCD.

[0003] The backlight module is divided into two types: side-entry backlight module and direct-type backlight module according to the different incident positions of the light source. Among them, the side-entry backlight module generally sets the backlight LED light bar at the bottom or left and right sides of the optical film. No matter where the light bar is set, in order to ensure the picture quality and no reliability risk, the design must not only consider the position of the optical film in the backlight module, but also reserve a certain amount of space for movement. Affected by gravity, the restrictions on the up and down movement of the film material are much higher than the left and right movement. Therefore, the restrictions on up and down movement are generally located on both the left and right sides of the optical film, while the restrictions on left and right movement can be located only on the top or bottom of the optical film.

[0004] At present, for the side-entry backlight module, the positioning of this type of optical film is limited by the position of the light bar, and it is difficult to limit it by using the back plate on the side where the light bar is installed. Taking the installation of the light bar on the left and right sides of the optical film as an example, the first hanging ear is generally set on the upper and lower sides of the optical film, and the first hanging ear needs to take into account the function of limiting the left and right and up and down movement at the same time. For example: you can punch a hole in the first hanging ear and put it on the positioning column reserved for the notch of the back plate folding edge, or you can change the structure of the back plate, make a concave structure on the back plate folding edge, and make the film material lug into a T shape, which is stuck on the concave structure of the folding edge. Although the above common positioning methods solve the problem of limiting the film material in two directions, it will increase the border width of the backlight module, which is not conducive to the narrow border of the backlight module. Therefore, it is necessary to provide a new way to fix the light bar, which will not increase the border width of the backlight module while meeting the limiting function. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a backlight module and a display module to solve the problem that it is difficult to limit the movement of the optical film by using the back plate on the side where the light bar is installed due to the height limitation of the light bar. The specific technical solution is as follows:

[0006] The first aspect of the present application provides a backlight module, comprising: a back plate having a accommodating cavity; a light guide plate located in the accommodating cavity; at least one light bar located in the accommodating cavity and facing the side wall of the light guide plate, the light emitting direction of the light bar is toward the light guide plate, the light bar comprises a circuit substrate and a light-emitting element, each of the circuit substrates is provided with at least one hanging portion; an optical film material assembly is located on the light emitting side of the light guide plate, comprising a plurality of optical film sheets stacked on the light emitting side of the light guide plate, at least one of the optical film sheets arranged close to the light guide plate is provided with a first hanging ear cooperating with the hanging portion to limit the position of the optical film sheet.

[0007] In some embodiments, the back panel includes a sky side and a ground side opposite to each other along a first direction, and a first side and a second side opposite to each other along a second direction, wherein the first direction and the second direction are parallel to the light emitting surface and perpendicular to each other; the light strip has two light strips, which are respectively arranged on the inner side surfaces of the first side and the second side.

[0008] In some embodiments, the hanging portion is arranged at one or both ends of the circuit substrate along the first direction, the hanging portion is a first protrusion protruding upward from a side parallel to the circuit substrate and close to the light emitting surface, the first hanging ear is arranged at a corner of the optical film, the first hanging ear abuts against the first protrusion on one side along its width direction, and abuts against the inner side surface of the back plate on the other side.

[0009] In some embodiments, the hanging portion is arranged in the middle area of ​​the circuit substrate away from the end portion, and the hanging portion is a second protrusion protruding upward from a side of the circuit substrate parallel to and close to the light-emitting surface, and each circuit substrate is provided with one second protrusion or at least one pair of second protrusions, and each pair of second protrusions has a first interval; the second protrusion is provided with one, and the second protrusions located on the two circuit substrates are both abutted against the side of the first hanging ear corresponding thereto facing the sky side or the ground side, or the second protrusion is provided with a pair of the first hanging ears corresponding thereto extending into the first interval.

[0010] In some embodiments, the distance between the first protrusion and the second protrusion and the top surface of the back plate is greater than or equal to 2 mm and less than or equal to 4 mm.

[0011] In some embodiments, the hanging portion is arranged in the middle area of ​​the circuit substrate away from the end portion, and the hanging portion is a third protrusion protruding upward from a side of the circuit substrate parallel to and close to the light-emitting surface, and each circuit substrate is provided with one of the third protrusions or at least one pair of the third protrusions, and a second interval is provided between each pair of the third protrusions; the third protrusion is provided with one, and a side of the third protrusion on one of the circuit substrates facing the sky side abuts against the first hanging ear corresponding thereto, and a side of the third protrusion on the other circuit substrate facing the ground side abuts against the first hanging ear corresponding thereto, or the third protrusion is provided with a pair of the first hanging ears corresponding thereto extending into the second interval.

[0012] In some embodiments, the hanging portion is a buckle member provided on a side of the circuit substrate parallel to and close to the light emitting surface, and the first hanging ear is inserted into the buckle member.

[0013] In some embodiments, the fastening element is in a "U" shape, a "U" shape, or an inverted "U" shape.

[0014] In some embodiments, the optical film is provided with at least one second hanging ear on the side corresponding to the sky side, the sky side of the back panel is provided with a clamping portion, and the second hanging ear cooperates with the clamping portion; and / or, the optical film has a recessed structure in the middle part of the side corresponding to the ground side, the recessed structure is used to avoid the rubber frame, and the optical film located on both sides of the recessed structure is clamped with the rubber frame.

[0015] In some embodiments, the back panel includes a sky side and a ground side opposite to each other along a first direction, and a first side and a second side opposite to each other along a second direction, the first direction and the second direction are parallel to the light emitting surface and perpendicular to each other; the light bar has one and is arranged on the inner side surface of the ground side; the hanging portion is arranged at one or both end portions of the circuit substrate along the first direction, the hanging portion is a first protrusion protruding upward from a side of the circuit substrate parallel to and close to the light emitting surface, the first hanging ear is arranged at the corner of the optical film, the first hanging ear is abutted against the first protrusion on one side along its width direction, and is abutted against the inner side surface of the back panel on the other side.

[0016] The second aspect of the present application provides a display module, comprising a liquid crystal display panel and the backlight module described above; the liquid crystal display panel and the backlight module are arranged relative to each other, and the backlight module provides a display light source to the liquid crystal display panel so that the liquid crystal display panel displays an image.

[0017] Beneficial effects of the embodiments of the present invention:

[0018] The backlight module and display module provided by the embodiment of the present invention are characterized in that the backlight module uses a circuit substrate to position the optical film, and there is no need to increase the width of the frame of the circuit substrate and the back plate to shield the special structure, and the frame can be easily kept at a small level. At the same time, since the hanging part is arranged on the circuit substrate, the back plate does not need any special design, so that there is no additional difficulty in the molding process of the back plate, which is conducive to reducing the difficulty of making the back plate and reducing the production cost of the back plate. Moreover, the first hanging ear is only responsible for the limiting function in one direction, and there is no problem of mutual influence of precision when positioning in two directions at the same time, and it has a higher positioning accuracy. At the same time, the first hanging ear is only responsible for positioning in one direction, and its force condition during transportation or vibration testing is relatively simple and not easy to be damaged. Even if damage occurs, it does not affect the positioning in the other direction, and the risk of poor picture is minimized.

[0019] Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0021] Figure 1 An exploded schematic diagram of a backlight module provided in an embodiment of the present application at a viewing angle;

[0022] Figure 2 An exploded schematic diagram of a backlight module provided in an embodiment of the present application at another viewing angle;

[0023] Figure 3 A schematic diagram of the structure of the backplane provided in the embodiment of the present application;

[0024] Figure 4 A schematic diagram of the structure of the backlight module provided in the embodiment of the present application without the plastic frame;

[0025] Figure 5 for Figure 4 A magnified schematic diagram of part B;

[0026] Figure 6 A schematic diagram of the structure of a first optical film provided in an embodiment of the present application;

[0027] Figure 7 A schematic diagram of the structure of the light bar provided in the embodiment of the present application in the first embodiment;

[0028] Figure 8A schematic diagram of the partial structure of the light bar provided in the embodiment of the present application in a second embodiment;

[0029] Fig. 9 A schematic diagram of the partial structure of the light bar provided in the embodiment of the present application in the third embodiment;

[0030] Fig.10 A schematic diagram of a partial structure of the light bar provided in the embodiment of the present application in a fourth embodiment;

[0031] Fig.11 A schematic diagram of a partial structure of a light bar provided in an embodiment of the present application in a fifth embodiment;

[0032] Fig.12 A schematic diagram of a partial structure of a sixth embodiment of the light bar provided in an embodiment of the present application;

[0033] Fig.13 A schematic diagram of the partial structure of the light bar provided in the embodiment of the present application in a seventh embodiment;

[0034] Fig.14 for Figure 4 A magnified schematic diagram of part C;

[0035] Fig.15 for Figure 4 The enlarged schematic diagram of the D part;

[0036] Fig.16 for Figure 3 Enlarged schematic diagram of part A.

[0037] The reference numerals are as follows:

[0038] Back plate 100; first side 101; second side 102; sky side 103; snap-fitting portion 1031; ground side 104; opening 105; raised portion 106; notch 107; light guide plate 200; light output side 201; light bar 300; circuit substrate 301; first protrusion 3011; second protrusion 3012; first spacer 30121; third protrusion 3013; fastening member 3014; light emitting element 302; first optical film 400; first hanging ear 401; second hanging ear 402; recessed structure 403; raised structure 404; plastic frame 500; reflective sheet 600; first direction X; second direction Y. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the present invention.

[0040] In order to solve the problem that it is difficult to use the back plate 100 to limit the vertical movement of the optical film on the left and right sides when installing the light bar 300 on the left and right sides of the backlight module, and it is difficult to achieve a narrow frame when limiting the left and right movement and the vertical movement on the upper and lower sides of the back plate 100 at the same time, the present application proposes a backlight module, such as Figure 1 , Figure 2 As shown, the backlight module includes a back panel 100, a light guide plate 200, at least one light bar 300 and an optical film assembly. The back panel 100 has a receiving cavity, and the light guide plate 200 is located in the receiving cavity. At least one light bar 300 is located in the receiving cavity and is directly opposite to the side wall of the light guide plate 200. The light emitting direction of the light bar 300 is toward the light guide plate 200. The light bar 300 includes a circuit substrate 301 and a light emitting element 302. The light emitting element 302 can be, for example, an LED lamp bead. Each circuit substrate 301 is provided with at least one hanging portion. The optical film assembly is located on the light emitting side 201 of the light guide plate 200. The optical film assembly includes a plurality of optical films stacked on the light emitting side 201 of the light guide plate 200. At least one optical film arranged close to the light guide plate 200 is provided with a first hanging ear 401 that cooperates with the hanging portion to limit the optical film.

[0041] Alternatively, if Figure 1 As shown, the backlight module also includes a reflective sheet 600, which is located in the accommodating cavity and clamped between the light guide plate 200 and the bottom plate of the back plate 100. The reflective sheet 600 is located below the light guide plate 200. The reflective sheet 600 can reflect the light below the light guide plate 200, thereby increasing the utilization rate of light.

[0042] The light-emitting side 201 of the light guide plate 200 is the side from which the light is emitted from the light guide plate 200. In this embodiment, the light bar 300 is directly opposite to the side wall of the light guide plate 200. The light enters from the side of the light guide plate 200 and passes through the top surface of the light guide plate 200. The light-emitting side 201 of the light guide plate 200 is also the top surface of the light guide plate 200. The optical film assembly is located on the light-emitting side 201 of the light guide plate 200, and is used to diffuse and uniformly process the surface light source emitted by the light guide plate 200, thereby ensuring a clearer display of the display module.

[0043] The optical film assembly generally includes at least two optical films. The optical film arranged close to the light guide plate 200 is recorded as the first optical film 400, and the optical film arranged far from the light guide plate 200 is recorded as the second optical film. Specifically, the first optical film 400 is, for example, a lower diffusion film, and the second optical film is, for example, a composite film. At least one optical film arranged close to the light guide plate 200 is provided with a first hanging ear 401 that cooperates with the hanging portion, that is, only the first optical film 400 may be provided with the first hanging ear 401 that cooperates with the hanging portion, or both the first optical film 400 and the second optical film may be provided with the first hanging ear 401 that cooperates with the hanging portion. That is, only the first optical film 400 may be positioned using the circuit substrate 301, or both the first optical film 400 and the second optical film may be positioned using the circuit substrate 301. In fact, due to the height limitation of the light bar 300, only the first optical film 400 may not be limited by the back plate 100, so the first optical film 400 is limited by the circuit substrate 301, while other optical films can still be limited by the back plate 100. Of course, the entire optical film assembly can also be limited by the circuit substrate 301.

[0044] In some embodiments, the optical film assembly may also include three layers of optical films, that is, further including a prismatic film disposed between the first optical film 400 and the second optical film. In this embodiment, only the first optical film 400 may be positioned using the circuit substrate 301, or both the first optical film 400 and the prismatic film may be positioned using the circuit substrate 301, or the entire optical film assembly may be positioned using the circuit substrate 301.

[0045] For the three-layer optical film assembly, the lower diffusion film is used to homogenize the surface light source emitted by the light guide plate 200, and the prism film is used to concentrate the scattered light within a certain angle range to increase the brightness within the angle range. The composite film can protect the backlight module. The above is only an exemplary description. In other embodiments, the optical film may also include other optical films, which are not limited here.

[0046] It should be noted that the drawings in the specification only illustrate one of the optical films, namely the first optical film 400, using the circuit substrate 301 for position limiting. The other optical films (not shown in the drawings) of the optical film assembly are still limited by the back plate 100, such as Figure 3 As shown, the first side 101 and the second side 102 of the back plate 100 are provided with a plurality of openings 105, and other optical films of the optical film assembly are provided with third hanging ears (not shown in the figure) at positions corresponding to the openings 105, and the two cooperate with each other for positioning.

[0047] like Figure 3As shown, the back plate 100 has notches 107 at four corner positions, which can reduce the difficulty of molding the back plate 100 and reserve design space for the first hanging ears 401 at the corners.

[0048] At least one hanging portion is provided on the circuit substrate 301, and the optical film is provided with a first hanging ear 401 corresponding thereto, and the optical film is limited by the cooperation between the hanging portion and the first hanging ear 401. The optical film is positioned by using the circuit substrate 301, and there is no need to increase the width of the frame of the circuit substrate 301 and the back plate 100 to cover the special structure, and the frame can be easily kept at a small level. At the same time, since the hanging portion is provided on the circuit substrate 301, the back plate 100 does not need any special design, so that there is no additional difficulty in the molding process of the back plate 100, which is conducive to reducing the difficulty of making the back plate 100 and reducing the manufacturing cost of the back plate 100.

[0049] In the positioning method of this embodiment, the first hanging ear 401 is only responsible for the limiting function in one direction, and there is no problem of mutual influence of precision when positioning in two directions at the same time, and the positioning accuracy is relatively high. At the same time, the first hanging ear 401 is only responsible for positioning in one direction, and its force condition during transportation or vibration testing is relatively simple, and it is not easy to be damaged. Even if damage occurs, it will not affect the positioning in the other direction, and the risk of poor picture quality is minimized.

[0050] In some embodiments of the present application, Figure 3 As shown, the back plate 100 includes a sky side 103 and a ground side 104 opposite to each other along a first direction X, and a first side 101 and a second side 102 opposite to each other along a second direction Y. The first direction X and the second direction Y are parallel to the light emitting surface and perpendicular to each other. The light bar 300 has two, which are respectively arranged on the inner side surfaces of the first side 101 and the second side 102.

[0051] like Figure 3 As shown, the light bar 300 is respectively arranged on the left and right sides of the optical film, and the hanging part cooperates with the first hanging ear 401 to limit the optical film along the first direction X, that is, the upper and lower directions in the figure. The problem that the optical film cannot be limited up and down on the left and right sides of the back plate 100 due to the limitation of the light bar 300 can be solved, and there is no need to set a special limiting structure on the sky side 103 and the ground side 104 of the back plate 100 to limit the upper and lower directions and the left and right directions at the same time. In this way, the first hanging ear 401 is only responsible for the limiting function in one direction, and there is no problem of mutual influence of accuracy when positioning in two directions at the same time, and it has a higher positioning accuracy. At the same time, the first hanging ear 401 is only responsible for positioning in one direction, and its force condition during transportation or vibration testing is relatively simple and not easy to be damaged. Even if damage occurs, it does not affect the positioning in the other direction, and the risk of poor picture quality is minimized.

[0052] In this embodiment, since the circuit substrate 301 limits the optical film in the upper and lower directions, and limits both sides at the same time, it can meet the strict requirements for limiting the upper and lower movements of the film material under the influence of gravity. In addition, since the upper and lower directions of the optical film can be limited by the circuit substrates 301 on the left and right sides, the sky side 103 or the ground side 104 of the back plate 100 only needs to limit the optical film in the left and right directions, and there is no need to limit the optical film in two directions at the sky side 103 or the ground side 104 of the back plate 100 at the same time. The two directions are limited separately, and there is no interference problem, which can improve the limiting accuracy.

[0053] Of course, there can also be only one light bar 300, which is set on the inner side of the ground side 104. At this time, the limitation of the optical film in the left and right directions can also be performed by the circuit substrate 301. And because the optical film is also limited on the side where the light bar 300 is set, when the display screen is rotated 90° to be "vertically" used, the optical film is limited by both the sky side 103 and the ground side 104 of the display screen, so that the optical film can overcome the falling caused by gravity, ensuring the normal display of the picture, especially the edge picture. In addition, limiting the optical film by the circuit substrate 301 is also conducive to reducing the size of the bottom frame, and can further simplify the structure of the back plate 100 and reduce the production cost of the back plate 100.

[0054] In some embodiments of the present application, the hanging portion is disposed at one or both ends of the circuit substrate 301 along the first direction X, such as Figure 5 , Figure 6 , Figure 7 As shown, the hanging portion is arranged at an end of the circuit substrate 301 along the first direction X, and the hanging portion is a first protrusion 3011 protruding upward from a side parallel to and close to the light emitting surface of the circuit substrate 301. The first hanging ear 401 is arranged at a corner of the optical film, and the first hanging ear 401 abuts against the first protrusion 3011 on one side along its width direction, and abuts against the inner side surface of the back plate 100 on the other side.

[0055] In this embodiment, the hanging portion can be provided only at one end of the circuit substrate 301 along the first direction X, or at both ends. The side of the circuit substrate 301 that is parallel to and close to the light-emitting surface is the top surface of the circuit substrate 301, and a first protrusion 3011 is provided on the top surface. The first hanging ear 401 is provided at a corner of the optical film. One side of the first hanging ear 401 abuts against the inner side of the back plate 100, and the other side abuts against the first protrusion 3011, thereby limiting the upward and downward movement of the optical film.

[0056] It should be noted that when the structure of the light strip 300 changes, the structure of the optical film (only the first optical film 400 is illustrated in the drawings) will also change accordingly, and a first ear 401 will be set at the corresponding position. The structures of the optical films are not listed one by one in the drawings of the specification.

[0057] In some embodiments of the present application, the hanging portion is also arranged in the middle area of ​​the circuit substrate 301 away from the end, and the hanging portion is a second protrusion 3012 protruding upward from the side parallel to and close to the light-emitting surface of the circuit substrate 301. Each circuit substrate 301 is provided with a second protrusion 3012 or is provided with at least one pair of second protrusions 3012, and each pair of second protrusions 3012 has a first interval 30121; the second protrusion 3012 is provided with one, and the second protrusions 3012 located on the two circuit substrates 301 are both abutted against the side of the corresponding first hanging ear 401 facing the sky side 103 or the ground side 104, or the second protrusion 3012 is provided with a pair of first hanging ears 401 corresponding to it extending into the first interval 30121.

[0058] In this embodiment, Figure 8 As shown, when only one second protrusion 3012 is provided, it can be arranged on the basis of the first protrusion 3011 provided at the end of the circuit substrate 301, and the first ear 401 is in contact with the second protrusion 3012 on the side facing the sky side 103 or the ground side 104. In this way, on the basis of the first protrusion 3011 and the back plate 100 limiting the up and down movement of the optical film, the second protrusion 3012 can further increase the limiting effect on the optical film.

[0059] Or, if Fig. 9 As shown, at least one pair of second protrusions 3012 can be provided on each circuit substrate 301, and a pair is composed of two second protrusions 3012. Optionally, two adjacent pairs can share a middle second protrusion 3012, that is, two pairs are composed of three second protrusions 3012, which is suitable for two pairs to be arranged closely. Of course, the two pairs can also include four second protrusions 3012, two by two forming a pair. The first hanging ear 401 extends into the first interval 30121 between the pair of second protrusions 3012, and the width of the first hanging ear 401 matches the first interval 30121, and the optical film can also be limited by a pair of second protrusions 3012. In other words, when a pair or more than one pair of second protrusions 3012 are provided in the middle of the circuit substrate 301, the first protrusion 3011 can also be not provided, and the optical film can also be limited by the second protrusion 3012 alone.

[0060] By simultaneously providing the first protrusion 3011 and the second protrusion 3012 on the circuit substrate 301 , the optical film can be limited in multiple positions, which has a better limiting effect on the optical film.

[0061] In some embodiments of the present application, the distance between the first protrusion 3011 and the second protrusion 3012 and the top surface of the back plate 100 is greater than or equal to 2 mm and less than or equal to 4 mm, for example, it can be 2 mm, 2.5 mm, 3 mm, 4 mm, etc. The first protrusion 3011 and the second protrusion 3012 are slightly lower than the top surface of the back plate 100, where the top surface refers to the highest surface of the back plate 100 parallel to the light emitting surface. The first protrusion 3011 and the second protrusion 3012 are slightly lower than the top surface of the back plate 100, and are not likely to interfere with other components during the subsequent assembly process.

[0062] In some embodiments of the present application, Fig.10 As shown, the light strip 300 has two portions, which are respectively arranged on the inner side surfaces of the first side 101 and the second side 102. The hanging portion is arranged in the middle area of ​​the circuit substrate 301 away from the end portion. The hanging portion is a third protrusion 3013 that protrudes upward from a side parallel to and close to the light-emitting surface of the circuit substrate 301. Each circuit substrate 301 is provided with a third protrusion 3013 or at least a pair of third protrusions 3013, and a second interval is provided between each pair of third protrusions 3013; the third protrusion 3013 is provided with one, and the third protrusion 3013 on one circuit substrate 301 has a side facing the sky side 103 and abuts against the first hanging ear 401 corresponding thereto, and the third protrusion 3013 on the other circuit substrate 301 has a side facing the ground side 104 and abuts against the first hanging ear 401 corresponding thereto, or the third protrusion 3013 is provided with a pair of first hanging ears 401 corresponding thereto extending into the second interval.

[0063] In this embodiment, each circuit substrate 301 is not provided with a first protrusion 3011, and each circuit substrate 301 is provided with a third protrusion 3013. By utilizing the staggered arrangement of the first hanging ears 401, or the staggered arrangement of the third protrusions 3013 on two circuit substrates 301, one of the first hanging ears 401 is in contact with the side of the third protrusion 3013 corresponding to it facing the sky side 103, and the other hanging ear is in contact with the side of the third protrusion 3013 corresponding to it facing the ground side 104, so as to achieve the function of limiting the optical film in the up and down directions. The third protrusions 3013 on the left and right sides cooperate with each other to limit the optical film, which can reduce the number of the third protrusions 3013, and further simplify the structure of the light bar 300.

[0064] Alternatively, each circuit substrate 301 is provided with at least one pair of third protrusions 3013, and the first hanging ear 401 extends into the second interval between the pair of third protrusions 3013. Fig. 9, just remove the first protrusion 3011 at the end of the light bar 300. The concept of a pair here is the same as the concept of a pair in the second protrusion 3012, and will not be repeated here. In this embodiment, the optical film can be limited by relying on a pair of third protrusions 3013, and the first hanging ear 401 and the pair of third protrusions 3013 do not need to be staggered, and the optical film can be limited from both sides.

[0065] In some embodiments of the present application, Fig.11 , Fig.12 and Fig.13 As shown, the hanging portion is a buckle 3014 disposed on a side of the circuit substrate 301 parallel to and close to the light emitting surface, and the first hanging ear 401 is inserted into the buckle 3014 .

[0066] In some embodiments of the present application, the hanging portion is a buckle 3014, and the first hook 401 is inserted into the buckle 3014 to limit the up and down movement of the optical film. When the hanging portion is a buckle 3014, only one buckle 3014 is needed to limit the optical film. When the light bar 300 is arranged on the inner side of the first side 101 and the second side 102 of the back plate 100, in order to ensure that the optical film is evenly stressed, the buckle 3014 can be basically symmetrically arranged in the circuits of the two light bars 300. When the light bar 300 is arranged on the inner side of the ground side 104 of the back plate 100, only one buckle 3014 can be arranged to limit the left and right movement of the optical film. Preferably, the buckle 3014 can be arranged in the middle position of the circuit substrate 301.

[0067] Alternatively, if Fig.11 , Fig.12 and Fig.13 As shown, the fastening member 3014 is in a "mouth" shape, a "U" shape or an inverted "U" shape.

[0068] The fastening member 3014 is a "U"-shaped structure, which is simpler and easier to manufacture.

[0069] The buckle 3014 is in the shape of a "mouth" or an inverted "U", which can not only limit the upward and downward movement of the optical film, but also limit the movement of the optical film along the thickness direction of the backlight module, which can further improve the positioning accuracy.

[0070] It should be noted that the “mouth” shape, “U” shape or inverted “U” shape may be a through slot along the first direction X, which may further simplify the structure of the fastening member 3014 .

[0071] In some embodiments of the present application, Figure 4 and Fig.14As shown, at least one second ear 402 is provided on the side of the optical film corresponding to the sky side 103, and a snap-fitting portion 1031 is provided on the sky side 103 of the back panel 100, and the second ear 402 cooperates with the snap-fitting portion 1031; and / or, a recessed structure 403 is provided in the middle of one side of the optical film corresponding to the ground side 104, and the recessed structure 403 is used to avoid the rubber frame 500, and the optical film located on both sides of the recessed structure 403 is snap-fitted with the rubber frame 500.

[0072] In this embodiment, the second hanging ear 402 of the optical film cooperates with the clamping portion 1031 of the day side 103 of the back plate 100, wherein the clamping portion 1031 may be a groove arranged toward the optical film, or may be a "U"-shaped through hole. The second hanging ear 402 cooperates with the clamping portion 1031 to limit the left and right movement of the optical film. In this way, the up and down movement and the left and right movement of the optical film are restricted, and the positioning accuracy of the optical film can be further improved.

[0073] Combination Figure 4 and Fig.15 As shown, optionally, the optical film has a recessed structure 403 in the middle at one end of the side 104 corresponding to the back plate 100, so that the plastic frame 500 can be directly pressed on the light guide plate 200 through the recessed structure 403, so that the light guide plate 200 can be further limited by the plastic frame 500 to ensure the positioning accuracy of the light guide plate 200. The two ends of the optical film corresponding to the side 104 form a convex structure 404 relative to the concave structure 403, and the convex structure 404 is inserted into the groove (not shown in the figure) of the plastic frame 500, so that the optical film and the plastic frame 500 are snap-fitted. Fig.16 As shown, there is a protrusion 106 on the top surface of the back plate 100, and a corresponding position of the plastic frame 500 is provided with an avoidance groove, and the protrusion 106 is inserted into the avoidance groove so that the back plate 100 and the plastic frame 500 are snap-fitted.

[0074] In some embodiments of the present application, the back panel 100 includes a sky side 103 and a ground side 104 opposite to each other along a first direction X, a first side 101 and a second side 102 opposite to each other along a second direction Y, the first direction X and the second direction Y are parallel to the light emitting surface and perpendicular to each other; the light bar 300 has one and is arranged on the inner side surface of the ground side 104; the hanging portion is arranged at one or both ends of the circuit substrate 301 along the first direction X, the hanging portion is a first protrusion 3011 protruding upward from one side of the circuit substrate 301 parallel to and close to the light emitting surface, the first hanging ear 401 is arranged at the corner of the optical film, and the first hanging ear 401 is abutted against the first protrusion 3011 on one side along its width direction, and abutted against the inner side surface of the back panel 100 on the other side.

[0075] When there is only one light bar 300 and it is arranged on the inner side surface of the ground side 104 of the back plate 100, the hanging portion can be a first protrusion 3011 arranged on the top surface of the circuit substrate 301, and the first hanging ear 401 is arranged at the corner of the optical film. The first protrusion 3011 cooperates with the first hanging ear 401 to limit the left and right movement of the optical film. The optical film is positioned by using the circuit substrate 301, so the back plate 100 needs to be hollowed out at this point, so the light leakage problem caused by the hollowing out of the back plate 100 can also be avoided, and there is no need to prevent light leakage at this point by adding shading tape, which is conducive to keeping the frame of the back plate 100 at a smaller level. At the same time, since the back plate 100 does not need to be specially designed, there is no additional difficulty in the molding process of the back plate 100, which is conducive to reducing the difficulty of making the back plate 100 and reducing the production cost of the back plate 100.

[0076] In the case where the light bar 300 is disposed on the inner side of the ground side 104 , the hanging portion may also be disposed in the middle of the circuit substrate 301 . For details, please refer to the embodiment where the light bar 300 is disposed on the first side 101 and the second side 102 , which will not be described again.

[0077] The second aspect of the present application provides a display module, including a liquid crystal display panel and the backlight module described above; the liquid crystal display panel and the backlight module are arranged relative to each other, and the backlight module provides a display light source to the liquid crystal display panel so that the liquid crystal display panel displays an image.

[0078] The display module in the embodiment of the present application includes a backlight module, which limits the activity of at least one optical film through a circuit substrate 301. It is not only suitable for the situation where the light bar 300 is installed on the left and right sides of the back panel 100, and it is inconvenient to use the back panel 100 for limiting the position due to the height limitation of the light bar 300, but also suitable for the situation where the light bar 300 is installed on the ground side 104 of the back panel 100, and it is inconvenient to use the back panel 100 for limiting the position due to the height limitation of the light bar 300.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A backlight module, characterized in that: include: A back plate having a receiving cavity; A light guide plate, located in the accommodating cavity; At least one light bar is located in the accommodating cavity and directly faces the side wall of the light guide plate, the light emitting direction of the light bar is toward the light guide plate, the light bar includes a circuit substrate and a light emitting element, and each circuit substrate is provided with at least one hanging portion; The optical film assembly is located on the light-emitting side of the light guide plate, and includes a plurality of optical films stacked on the light-emitting side of the light guide plate. At least one of the optical films arranged close to the light guide plate is provided with a first hanging ear that cooperates with the hanging portion to limit the optical film.

2. The backlight module according to claim 1, characterized in that: The back plate comprises a sky side and a ground side opposite to each other along a first direction, and a first side and a second side opposite to each other along a second direction, wherein the first direction and the second direction are parallel to the light emitting surface and perpendicular to each other; The light bars have two portions, which are respectively arranged on the inner side surfaces of the first side and the second side.

3. The backlight module according to claim 2, characterized in that: The hanging portion is arranged at one or both ends of the circuit substrate along the first direction, and the hanging portion is a first protrusion protruding upward from a side parallel to the circuit substrate and close to the light emitting surface. The first hanging ear is arranged at a corner of the optical film, and the first hanging ear abuts against the first protrusion on one side along its width direction, and abuts against the inner side surface of the back plate on the other side.

4. The backlight module according to claim 3, characterized in that: The hanging portion is disposed in a middle area of ​​the circuit substrate away from the end portion, and the hanging portion is a second protrusion protruding upward from a side of the circuit substrate parallel to and close to the light emitting surface, each circuit substrate is provided with one second protrusion or at least one pair of the second protrusions, and a first interval is provided between each pair of the second protrusions; The second protrusion is provided with one, and the second protrusions located on the two circuit substrates are both in contact with the corresponding first hanging ears facing the sky side or the ground side, or the second protrusion is provided with a pair of first hanging ears corresponding to them extending into the first interval.

5. The backlight module according to claim 4, characterized in that: The distance between the first protrusion and the second protrusion and the top surface of the back plate is greater than or equal to 2 mm and less than or equal to 4 mm.

6. The backlight module according to claim 2, characterized in that: The hanging portion is arranged in the middle area of ​​the circuit substrate away from the end portion, and the hanging portion is a third protrusion protruding upward from a side of the circuit substrate parallel to and close to the light emitting surface, each circuit substrate is provided with one third protrusion or at least one pair of the third protrusions, and a second interval is provided between each pair of the third protrusions; The third protrusion is provided with one, wherein one side of the third protrusion on one of the circuit substrates facing the sky side abuts against the first hanging ear corresponding thereto, and one side of the third protrusion on the other circuit substrate facing the ground side abuts against the first hanging ear corresponding thereto, or the third protrusion is provided with a pair of the first hanging ears corresponding thereto extending into the second interval.

7. The backlight module according to claim 2, characterized in that: The hanging portion is a buckling piece arranged on a side of the circuit substrate parallel to and close to the light emitting surface, and the first hanging ear is inserted into the buckling piece.

8. The backlight module according to claim 7, characterized in that: The fastening piece is in a "U" shape, a "U" shape or an inverted "U" shape.

9. The backlight module according to claim 2, characterized in that: The optical film is provided with at least one second hanging ear on one side corresponding to the sky side, the back plate is provided with a clamping portion on the sky side, and the second hanging ear cooperates with the clamping portion; and / or, The optical film has a concave structure in the middle of one side corresponding to the ground side, and the concave structure is used to avoid the plastic frame. The optical film located on both sides of the concave structure is clamped with the plastic frame.

10. The backlight module according to claim 1, characterized in that: The back plate comprises a sky side and a ground side opposite to each other along a first direction, and a first side and a second side opposite to each other along a second direction, wherein the first direction and the second direction are parallel to the light emitting surface and perpendicular to each other; The light bar has one and is arranged on the inner side of the ground side; The hanging portion is arranged at one or both ends of the circuit substrate along the first direction, and the hanging portion is a first protrusion protruding upward from a side parallel to the circuit substrate and close to the light emitting surface. The first hanging ear is arranged at a corner of the optical film, and the first hanging ear abuts against the first protrusion on one side along its width direction, and abuts against the inner side surface of the back plate on the other side.

11. A display module, characterized in that: Comprising the backlight module according to any one of claims 1 to 10; A liquid crystal display panel is provided opposite to the backlight module, and the backlight module provides a display light source to the liquid crystal display panel so that the liquid crystal display panel displays an image.

Images